JPH11185795A - Electrolyte charging method for sealed lead-acid storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately charge electrolyte without using a complicated charging device by stopping charging electrolyte when the weight of a storage battery charged up with the electrolyte separately by several times reaches a prescribed level after the storage battery contining no electrolyte with a cover set on a battery jar in which an electrode plate group is disposed. SOLUTION: A cover is set on a battery jar having therein an electrode plate group and other component elements, and then a storage battery containing no electrolyte is measured in its weight. The weight of dilute sulfuric acid electrolyte necessary for the battery is calculated by the conversion of the specific gravity from the capacity of electrolyte, and the calculated weight of electrolyte is charged separately by several times so that the preliminarily set battery weight may be obtained. An error in the weight of the battery at the time of final charging should be about ±6.5 g. Accordingly, it is possible to allow the electrolyte whose amount gives an influence on the capacity of discharge to exist in the battery, with accuracy, thereby making characteristics of batteries even.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injecting electrolyte of a sealed lead-acid battery.

[0002]

2. Description of the Related Art The electrolyte of a lead-acid battery is an important component in determining the discharge capacity by reacting with the active materials of the positive electrode and the negative electrode during discharge. Usually, as a method of injecting the electrolyte, the prescribed amount of the electrolyte was converted into volume and injected into the storage battery.

[0003] In a sealed lead-acid battery, the electrolyte is impregnated in the positive electrode, the negative electrode active material, and the separator, and the space volume up to the lid above the electrode plate group tends to be reduced. For this reason, it takes time for the electrolytic solution to be impregnated into the electrode plate group. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 60-246557, an electrolytic solution having a predetermined capacity obtained by converting the volume of the battery into a reduced pressure state. The liquid was injected several times, but the decompression device had to be mounted on the battery, which made the process complicated, and the facilities for the injection tended to be large. Further, in the case where a battery case is formed, water in the electrolytic solution is electrolyzed during energization, so that a step of replenishing the electrolytic solution on the way may be required.

[0004] As a result, it is necessary to accurately know the volume of the liquid already injected at the time of injection, and as the number of injections increases, the management thereof becomes complicated.

[0005]

The problem with the above-mentioned conventional method for injecting an electrolytic solution is that since the amount of the electrolytic solution is controlled by volume, the amount of the electrolytic solution by the battery becomes non-uniform, that is, the discharge capacity becomes uneven. This often occurred, and complicated liquid injection devices and methods were sometimes required to solve this.

According to the present invention, when the electrolyte is injected into a sealed lead-acid battery in which the space between the upper part of the electrode group and the lid is small in several times, a predetermined diluted sulfuric acid is used without using a complicated injection device. The purpose is to inject the amount of electrolyte with high accuracy.

[0007]

According to the present invention, in order to achieve the above-mentioned object, after a group of electrodes comprising a positive electrode plate, a negative electrode plate and a separator is arranged in a battery case, a lid is attached by bonding or the like. The weight is measured in a state of being attached to the tank, that is, in a state of not containing the electrolytic solution. Next, the required amount of the diluted sulfuric acid electrolyte is converted into a weight. Here, the required weight of the diluted sulfuric acid electrolyte can be inevitably converted from the volume of the electrolyte by measuring the specific gravity of the electrolyte. Injecting the required amount of electrolyte into the lead storage battery in several steps, injecting until the battery weight reaches the preset value, and stopping the injection when the entire battery reaches the set weight. It was done.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the sealed lead-acid battery according to the present invention will be described below.

A general sealed lead-acid battery is composed of a plurality of positive plates, negative plates and separators, and a group of electrodes is formed by pole columns penetrating a lid, and is disposed in an opaque resin battery case. . A lid having a liquid injection port and a safety valve mounting cylinder is adhered to the battery case with an adhesive to be used. First, the weight of the lead storage battery containing no electrolyte is measured, and the weight value at this time is defined as A.

Next, the weight of the diluted sulfuric acid electrolyte to be injected is expressed as B
Set as For example, when dilute sulfuric acid having a specific gravity of 1.28 is present in an 80 ml battery, the amount of electrolyte is 10
2.4 g.

Assuming that the weight of the finally completed battery is C, C = A + B. With sealed lead-acid batteries, the space above the electrode group is so small that it cannot be injected once,
It is necessary to dispense the solution several times, but if the total weight of the battery is finally set to C irrespective of the number of times, the amount of the electrolyte can be surely present in the battery. further,
Even when the electrolyte needs to be replenished during the battery case formation step, the electrolyte may be injected regardless of the previous injection amount.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to a sealed type lead-acid battery of 2V10Ah.

[0013] Height 64mm, width 41.5mm as an electrode plate
Thus, three positive electrode plates having a thickness of 3 mm and a negative electrode plate 4 having a thickness of 2 mm
The electrode plate group was constituted by combining the sheets with a separator having a thickness of 2 mm mainly composed of glass fiber. At this time, the total weight of the positive electrode plate was about 150 g, and the total weight of the negative electrode plate was about 120 g. After disposing these electrode plates in an opaque battery case made of ABS resin, a lid was adhered to produce a battery. The weight of this battery was measured to be about 302 g. This 30
The numerical value of 2 g includes 32 g of other components such as a battery case, a separator, and an adhesive. These fabricated batteries 6
When the weights of the four batteries were adjusted for the relative frequency (straight line) as shown in the histogram of FIG. 1, the weight distribution was in a state of normal distribution within ± 6.5 g.

The dilute sulfuric acid electrolyte to be injected into these batteries requires a specific gravity of 1.28 (37.4% by weight of sulfuric acid) to be 86 ml, that is, 41.2 g of sulfuric acid. The weight of the electrolyte amounted to 110 g, so the final cell weight was set to 412 ± 6.5 g. Next, the electrolyte was injected in order of about 60 g and about 30 g, and adjusted to the battery weight of 412 ± 6.5 g set at the time of the final injection. In this case, in each injection, JP-A-60-24655
As disclosed in Japanese Patent Publication No. 7, the pressure in the battery may be reduced to promote the injection. That is, the total weight of the electrolyte is 110 g.
The injection was performed so that As a result, the histogram of the total weight of the batteries after the injection of 64 pieces (FIG. 2) almost coincides with the histogram of the weight of the batteries before the injection (FIG. 1), indicating that the specified amount of electrolyte was injected. .

Next, the same battery was injected with the same electrolytic solution having a specific gravity of 1.28, in three volumes of 52 ml, 25 ml, and 9 ml each corresponding to 86 ml. The total weight of the 64 batteries at this time is similarly shown in the histogram of FIG. As a result, the conventional liquid injection type battery had a normal distribution of ± 10.2 g centered at 412 g, resulting in large variations. This is because when injecting several times, the error in measuring the volume to regulate each injection volume each time overlaps and increases, especially when injecting in a continuous process, The error from the reference value tends to increase further.

Compared to FIG. 2 and FIG. 3 of the histogram, the method of controlling the weight of the electrolytic solution of the present invention when the liquid is injected into the battery in several times is different from the conventional method in which the volume is controlled by volume. It is clear that the amount of electrolyte can be adjusted with high accuracy, which indicates that the amount of electrolyte in the battery is well regulated.

[0017]

As described above, according to the present invention, an accurate electrolytic solution can be provided for a sealed lead-acid battery in which the amount of an internal electrolyte must be regulated in several steps without using a complicated liquid injection device. The volume can be infused. As a result, it is effective in making the battery characteristics uniform by making the amount of the electrolyte that affects the discharge capacity accurately exist in the battery.

[Brief description of the drawings]

FIG. 1 is a diagram showing a histogram of a battery weight before liquid injection.

FIG. 2 is a diagram showing a histogram of the total weight of a battery after injection according to the electrolyte injection method of the present invention.

FIG. 3 is a diagram showing a histogram of the total weight of a battery after injection according to a conventional electrolyte injection method.

Claims (1)

[Claims] 1. An electrode group comprising a positive electrode plate, a negative electrode plate and a separator is disposed in a battery case, and a lid is attached to the battery case to measure the weight of a storage battery containing no electrolyte. Electrolyte injection in a sealed lead-acid battery, characterized in that the injection of the electrolyte is divided into a plurality of times, and the injection is stopped when the weight of the storage battery reaches a specified weight including the electrolyte. Liquid method.