JPH06310176A - Negative electrode absorbing type sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To provide a negative electrode absorbing type sealed lead-acid battery which is free of maintenance, simple in structure and capable of judging if it is degraded. CONSTITUTION:A lead wire 4 whose cross sectional area is decreased as it is extended longitudinally, is set within a battery jar 1 in such a way as to be in contact with an electrolyte hold body. The end side of the lead wire 4 where its cross sectional area is large, is connected to a positive electrode terminal 5. A plurality of measuring terminals 6 are set over the lead wire 4 along its longer direction at specified intervals in such a way as to be forwarded to the outside of the battery jar 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode absorption sealed lead-acid battery (hereinafter referred to as a sealed lead-acid battery), and more particularly to a sealed lead-acid battery suitable for a stationary type.

[0002]

2. Description of the Related Art Conventionally, a method of measuring the specific gravity of an electrolytic solution has been most commonly used as a method for determining the deterioration state of a lead storage battery. However, since the completely sealed sealed lead acid battery cannot directly measure the specific gravity of the electrolytic solution, a method of installing a lead dioxide electrode as an electrolytic solution specific gravity measuring electrode in a battery case has been proposed.

[0003]

However, in the method of installing the electrode for measuring the specific gravity of the electrolytic solution, the potential of the electrode for measuring the electrolytic solution is unstable, and it is necessary to periodically charge the battery. Therefore, maintenance is required. There was a problem that the structure was complicated.

An object of the present invention is to provide a sealed lead-acid battery that requires no maintenance and can judge the deterioration state with a simple structure.

[0005]

The structure of the present invention that achieves the above-mentioned object will be described. In the sealed lead-acid battery according to the present invention, a lead wire whose cross-sectional area decreases with the length is in contact with the electrolyte holding body. So that the end side of the lead wire having a large cross-sectional area is connected to the anode terminal, and a plurality of measurement terminals are exposed from the lead wire outside the battery case at predetermined intervals in the longitudinal direction. It is characterized by being provided.

[0006]

In such a sealed lead-acid battery, the lead wire installed in the battery case is corroded at the same potential as the anode terminal and in the same electrolyte, so measurement of the smaller cross-sectional area as the corrosion progresses The electrical connection from the power supply terminal to the anode terminal becomes poor.
Therefore, it is possible to estimate the corrosion state of the anode grid, that is, the deterioration state of the battery, by measuring the conduction between the anode terminal and the measurement terminal that goes out of the battery case from the lead wire.

[0007]

1 and 2 show an embodiment of a sealed lead-acid battery according to the present invention. As shown in the figure, in the sealed lead acid battery of this embodiment, the electrode plate group 2 is housed in an enclosed battery case 1 together with an electrolytic solution. Inner wall of battery case 1 and electrode plate group 2
The electrolytic solution holding body 3 is disposed between and. The electrolytic solution holder 3 contacts the electrode plate group 2 and the same electrolytic solution as the electrode plate group 2. In the battery case 1, a tapered lead wire 4 whose cross-sectional area decreases with the length is provided in the electrolyte holding body 3.
It is placed so that it is sandwiched by the battery case 1 and does not come into contact with the electrode plate group 2. An end side of the tapered lead wire 4 having a large cross-sectional area is connected to the anode terminal 5. The tapered lead wire 4 is provided with a plurality of measuring terminals 6 at predetermined intervals in the longitudinal direction thereof, and these measuring terminals 6 are provided so as to be liquid-tight outside the container 1.

An example of performing an accelerated life test using the sealed lead acid battery of this embodiment having such a structure will be described.
In the sealed lead-acid battery of this example having a rating of 2 V and 200 Ah, six measuring terminals 6 were installed on the tapered lead wire 4. Figure 3
[Fig. 4] is a characteristic diagram showing changes in discharge capacity and changes in the number of measuring terminals 6 in conduction with the anode terminal 5 in an accelerated life test at 45 ° C. As shown in FIG. 3, the number of measurement terminals 6 that are electrically connected to the anode terminals 5 decreased as the discharge capacity decreased, and it was possible to determine the deterioration state. In this example, a resistor and a light emitting diode were placed in series between the anode terminal 5 and the measurement terminal 6 as a means for confirming continuity, and a power source was connected.

In this embodiment, the tapered lead wire 4 is installed with the electrolytic solution holder 3 sandwiched between the electrode plate group 2 and the battery case 1. However, the position where the tapered lead wire 4 is installed is It is not necessary to limit to this position, and it may be installed at any position as long as it shares the same electrolytic solution as the electrode plate group 2. For example, the electrolytic solution holder 3 may be placed on the upper part of the electrode plate group 2, and the tapered lead wire 4 may be placed so as to come into contact with the electrolytic solution holder 3.
Further, in this embodiment, the tapered lead wire 4 has a linear shape, but may have a spiral shape as long as the cross-sectional area decreases from the side connected to the anode terminal 5. Furthermore, the reduction of the cross-sectional area in the length direction of the lead wire 4 is not limited to the taper shape, and may be a step shape.

[0010]

As described above, in the sealed lead-acid battery according to the present invention, the lead wire whose cross-sectional area decreases with the length is installed in the battery case so as to come into contact with the electrolytic solution holder, and the lead wire is Since the end side having a large cross-sectional area of is connected to the anode terminal and a plurality of measuring terminals are provided so as to come out of the battery case at predetermined intervals in the longitudinal direction from the lead wire, the lead wire serves as an anode terminal. Corrosion occurs at the same potential and in the same electrolytic solution, and as corrosion progresses, electrical continuity between the measuring terminal with the smaller cross-sectional area and the anode terminal becomes poor. By measuring the continuity with the measuring terminal that goes out,
It is possible to estimate the corrosion state of the anode grid, that is, the deterioration state of the battery. According to the present invention, the deterioration state of a sealed lead-acid battery can be easily measured with a simple configuration, and thus has an extremely great industrial value.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a sealed lead acid battery according to the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 viewed from another surface.

FIG. 3 is a characteristic diagram showing changes in the number of conductions between an anode terminal and a measurement terminal and changes in discharge capacity when a life test of the sealed lead acid battery of the present invention is performed.

[Explanation of reference symbols] 1 battery case 2 electrode plate group 3 electrolytic solution holder 4 tapered lead wire 5 anode terminal 6 measurement terminal

Claims (1)

[Claims] 1. A lead wire whose cross-sectional area decreases with length is installed in a container so as to come into contact with an electrolytic solution holder, and an end side of the lead wire having a large cross-sectional area is connected to an anode terminal, and A cathode absorption type sealed lead acid battery, characterized in that a plurality of measuring terminals are provided at predetermined intervals in the longitudinal direction from the lead wire so as to come out of the battery case.