JPH05326031A - Sealed lead battery - Google Patents

Abstract

PURPOSE:To recognize previously any rapid drop of battery capacity resulted from the extreme expansion of a positive plate so as not to miss the time of battery replacement by detecting the corrosion and the expansion of the positive plate during a trickle charge time, in the case of containing a group of plates in a mono-block type battery jar and making the jar sealed. CONSTITUTION:A group of plates 5 composed of a positive plate 2, a negative plate 3, a separator 4 is contained in a cell chamber at one end of a battery jar 1, a positive plate terminal 6 is welded to the fixed position thereof, and the whole body is sealed by a cover 7 as protruding the tip thereof. In this construction a metal piece 8 made of lead-calcium alloy is attached on the side face of the inner wall of the cell chamber so as to make a right angle to the positive plate 2, a lead plate 9 is connected thereto, and the end thereof is taken out into a passing-through recess 10 made in the cover 7 so as to form an output terminal 11. Thereby, electric resistance between the terminal 11 and the terminal 6 is measured, and when the electric resistance decreases rapidly, drop of a battery capacity is determined, so that the time of replacement is recognized.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A state in a cell chamber at one end of a battery case in a conventional sealed lead-acid battery will be described with reference to FIG.

As shown in FIG. 2, an electrode plate group 5 including a predetermined positive electrode plate 2, a negative electrode plate 3 and a separator 4 is housed in a cell chamber at one end of the battery case 1, and The positive electrode terminal 6 is welded to a predetermined position, and the upper portion of the battery case 1 is sealed with a lid 7.

At this time, the width of the positive electrode plate is 10 to 1 from the inner size of the battery case in consideration of the expansion of the positive electrode plate when the battery is used.
It is reduced by about 5%. Such a sealed lead-acid battery is used as an emergency standby power source for computers, electronic exchanges, etc., and is usually trickle charged by a weak current.

[0005]

FIG. 3 shows how the positive electrode plates housed in the cell chambers at both ends of the monoblock battery case 1 change during trickle charging of the conventional sealed lead acid battery.

As shown in FIG. 3, the positive electrode plates 2 in the cell chambers at both ends of the battery case 1 corrode during charging and expand until their upper portions contact the inner wall of the battery case 1. As a result, the capacities of the cells at both ends deteriorate faster than the other cells, and if trickle charging is continued in such a state, the capacities of the other cells also rapidly deteriorate.

This is because in the cell chambers at both ends of the battery case during trickle charging, the area exposed to the outside air is larger than the other cell chambers, so a large amount of gas or water vapor in the electrolytic solution passes outside the battery. It is thought to be for doing.

That is, since the amount of the electrolytic solution is reduced due to the dissipation of water vapor from the cell chamber, the oxygen gas generated from the positive electrode is easily absorbed by the negative electrode, and the reaction between the metallic lead in the negative electrode, oxygen and sulfuric acid is facilitated. As a result, a large amount of lead sulfate is produced in the negative electrode. Then, it is considered that the amount of current charged from the outside in order to return the lead sulfate to lead increases, and the increase in the current increases corrosion and expansion of the positive electrode plate.

Therefore, during trickle charging, the positive electrode plates in the cell chambers at both ends of the monoblock sealed lead-acid battery corrode and expand faster than the positive electrode plates in the other cell chambers, so that the capacity of the cells at both ends is different. It is expected to decline sooner.

In the conventional sealed lead-acid battery, since it is not possible to know in advance the rapid deterioration of the battery capacity when using such a battery, it is unclear when to replace the battery used in the device. This was a major drawback when using batteries.

The present invention is intended to solve such a problem, and when the sealed lead-acid battery is used, the deterioration state of the capacity of the cell at the end of the monoblock type battery case is detected, and the battery capacity is rapidly deteriorated. It is intended to provide a sealed lead acid battery capable of preventing the above.

[0012]

In order to solve the above-mentioned problems, the sealed lead-acid battery of the present invention is such that an electrode group is housed in each cell chamber of a monoblock type battery case and the upper part is sealed by a lid. In the sealed lead-acid battery described above, a metal piece having electrical conductivity is formed on a part of the side surface of the cell chamber having the positive electrode terminal at one end of the battery case at right angles to the positive electrode plate with an appropriate interval. It is arranged to face each other, connect a lead plate to the metal piece, take out the end of the lead plate to a predetermined position of the lid, and detect the presence or absence of electricity between the takeout terminal and the positive electrode terminal of the battery itself. It was done.

[0013]

As a result, when the sealed lead-acid battery is charged by trickle charging or the like, the positive electrode plate in the cell chamber having the positive electrode terminal at one end of the battery case corrodes and expands until it contacts the side surface of the inner wall of the cell chamber. The end surface of the positive electrode plate comes into contact with the metal piece attached to the side surface of the inner wall of the cell chamber.

Further, a lead plate is connected to the metal piece, and the end of the lead plate is taken out to a predetermined position of the lid,
A takeout terminal is provided.

Therefore, it is possible to determine whether or not the positive electrode plate is in contact with the side surface of the inner wall of the cell chamber by measuring the electric resistance between the positive electrode terminal of the battery and the lead terminal at the end of the lead plate. ..

That is, if the electric resistance between the positive electrode terminal and the lead-out terminal at the end of the lead plate is small, the positive electrode plate expands until it reaches the inner wall of the cell chamber, and the capacity starts to decrease. ..

As described above, in the lead-acid battery of the present invention, the electrical resistance between the lead-out terminal of the metal piece taken out at a predetermined position on the lid of the battery case and the positive electrode terminal of the battery is measured to determine whether or not electricity is applied between them. By investigating, the state of capacity deterioration of the cell can be easily grasped, and the capacity deterioration of the battery can be known in advance.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the inside of the cell chamber at one end of the battery case in the sealed lead-acid battery of the present invention. As shown in Figure 1,
A positive electrode plate 2, a negative electrode plate 3, and a separator 4 were placed in a cell chamber at one end of the battery case 1, and a positive electrode terminal 6 was welded to a predetermined position of the electrode plate group 5. Then, the upper part of the battery case 1 was sealed with a lid 7 to manufacture a sealed lead acid battery of the present invention having a nominal specification of 12V24Ah. Where the positive,
The size of the negative electrode plate was 100 mm in length × 98 mm in width.

Further, a metal piece 8 of a lead-calcium (Pb-Ca) alloy is provided on the side surface of the inner wall of the cell chamber, the positive electrode plate 2.
It is attached so as to form a right angle with.

Here, the size of the metal piece 8 is 5 mm in length.
The width was 20 mm and the thickness was 3 mm, and the distance between the metal piece 8 and the positive electrode plate 2 was 3 mm.

Then, a lead plate 9 is connected to the metal piece 8, and the end of the lead plate 9 is taken out into a recess 10 provided at a predetermined position of the lid 7, and this is used as a take-out terminal 11.

The comparative example is a conventional sealed lead-acid battery as shown in FIG. Next, the present invention and the conventional sealed lead-acid battery were continuously charged at a constant voltage of 13.8 V at 40 ° C., and the battery capacity was measured every 6 months. Here, the battery capacity was expressed by the discharging time at which the battery was discharged to a voltage of 10 V with a constant current of 24 A.

In addition to the measurement of the battery capacity, the electrical resistance between the lead terminal at the end of the lead plate connected to the metal piece and the positive electrode terminal was measured.

The results of these measurements are shown in FIG. As shown in FIG. 4, in the present invention and the conventional sealed lead-acid battery,
Both of the battery capacities began to gradually decrease after 1.5 years, and after 2.5 years, decreased to about half of the initial capacity.

However, in the battery of the present invention, when the electrical resistance between the lead terminal of the lead plate of the metal piece taken out at a predetermined position of the lid and the positive electrode terminal of the battery was measured, this electrical resistance passed one year. It had dropped sharply since then.

This is because when the battery is charged, the positive electrode plate inside the cell chamber at one end of the battery case expands until it contacts the inner wall of the cell chamber of the battery container, and the end face of the positive electrode plate contacts the metal piece and the gap between This is because the electrical resistance has decreased.

Therefore, by measuring the electric resistance, it is possible to know in advance the tendency of the battery capacity decrease before the battery capacity suddenly decreases, and the battery is replaced when the electric resistance begins to decrease. As a result, the capacity of the battery used in the device can always be maintained at a certain level or higher.

[0029]

As described above, in the sealed lead-acid battery of the present invention, a metal piece having electrical conductivity is attached to the positive electrode plate on a part of the side surface of the cell chamber provided with the positive electrode terminal at one end of the battery case. Since the positive electrode plate corrodes and expands until it contacts the inner wall of the battery case during charging, the end surface of the positive electrode plate contacts the metal piece and the space between them Since the electric resistance of the battery decreases, it is possible to know the decrease in the battery capacity in advance by checking whether or not the current is supplied between the positive electrode terminal and the lead terminal of the lead plate connected to the metal piece.

Therefore, it is possible to replace the battery by detecting the decrease in the battery capacity before the battery capacity suddenly decreases.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in a cell chamber at one end of a battery case in a sealed lead-acid battery of the present invention.

FIG. 2 is a cross-sectional view showing a state inside a cell chamber at one end of a battery case in a conventional sealed lead-acid battery.

FIG. 3 is a cross-sectional view showing the state of the inside of the cell chamber at one end of the battery case during trickle charging of a conventional sealed lead-acid battery.

FIG. 4 is a diagram showing changes in battery capacity during continuous charging of the present invention and a conventional sealed lead-acid battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Positive electrode plate 3 Negative electrode plate 4 Separator 5 Electrode plate group 6 Positive electrode terminal 7 Lid 8 Lead-calcium alloy metal piece 9 Lead plate 10 Recess 11 Metal piece extraction terminal

Front page continued (72) Inventor Shoji Fukawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A sealed lead acid battery in which an electrode plate group is housed in each cell chamber of a monoblock type battery case, and an upper part thereof is sealed by a lid, the cell having a positive electrode terminal at one end of the battery case. A metal piece having electric conductivity is formed on a part of the side surface of the chamber so as to face the positive electrode plate at a right angle to the positive electrode plate and at a suitable interval. A sealed lead-acid battery configured to be taken out at a predetermined position of the lid and to detect the presence or absence of energization between the takeout terminal and the positive terminal of the battery itself.