JPH04366565A - Deteriorated state detecting method for sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To estimate life by measuring the voltage between a positive electrode terminal and the foot part of a positive plate at the time of sending a current to the positive electrode terminal and a negative electrode terminal, and evaluating the deteriorated state with a value obtained by dividing the measured voltage by the current. CONSTITUTION:The voltage detecting line and current sending line of a mOMEGA meter 5 of AC four-terminal method are connected to the positive electrode terminal 7 of a measured battery 6. The current sending line is connected to the negative electrode terminal 8 of the battery, and the voltage detecting line to a voltage detecting terminal 3 connected to the foot part 2 of the positive plate 1 of the battery 6. When the mOMEGA meter 5 is operated, and alternative current is sent from the terminal 7 to the terminal 8, and a value obtained by dividing the AC voltage component between the terminals 7 and 3 by the sent current is indicated as a resistance value on the mOMEGA meter 5. This resistance value is increased together with the progress of the life, and about three times the initial value in the life end period. Thus, by measuring the resistance value, the life can be estimated.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for detecting the deterioration state of a cathode absorption type sealed lead acid battery, particularly a stationary cathode absorption type sealed lead acid battery (hereinafter referred to as a "stationary sealed lead acid battery"). be.

0002

2. Description of the Related Art Conventionally, methods for determining the lifespan of stationary lead-acid batteries include a method of actually measuring the discharge capacity of the battery and a method of measuring the specific gravity of the electrolyte. The former method is impractical, especially for large stationary lead-acid batteries, since the discharge load becomes large and measurement requires time and effort, so the latter method has been most commonly used.

0003

[Problems to be Solved by the Invention] However, stationary sealed lead-acid batteries have a sealed structure, so it is difficult to measure the specific gravity of the electrolyte, and the method of determining the lifespan is to detect the amount of physical deformation of the anode plate. etc. have been proposed.

However, in the above-mentioned method of detecting the amount of physical deformation of the anode plate, the relationship between the amount of deformation and the lifespan is not necessarily clear, and there are also problems in terms of reliability and complexity of the device. Ta.

[0005]

[Means for Solving the Problems] In the present invention, a terminal is provided at the foot of the anode plate, and the potential difference between the anode terminal and the terminal at the foot of the anode plate is measured when current is passed from the anode terminal to the cathode terminal. The state of deterioration is evaluated using the value obtained by dividing the measured voltage by the applied current.

[0006]

[Operation] When current is passed from the anode terminal to the cathode terminal,
Deterioration conditions can be detected because the potential difference between the anode terminal and the anode plate foot can be measured. The main lifespan factor for sealed lead-acid batteries in stationary applications is the elongation and corrosion of the anode lattice substrate.As the anode lattice substrate elongates and corrodes, the resistance of the anode lattice substrate naturally increases, and a constant current flows from the anode terminal to the cathode terminal. When electricity is applied, the potential difference between the anode terminal and the foot of the anode plate increases. Therefore, as a parameter for evaluating the elongation and corrosion of the anode grid substrate, it is possible to use the value obtained by dividing the potential difference between the anode terminal and the lower part of the anode plate by the applied current.

[0007]

[Example] An example of the present invention will be described. FIG. 1 is a sectional view of a stationary sealed lead acid battery. Foot part 2 of one anode plate 1
and the voltage detection terminal 3 are connected by a lead wire 4. Other structures are the same as normal stationary sealed lead-acid batteries;
A 00Ap, 2V stationary sealed lead acid battery was manufactured.

FIG. 2 is a connection diagram at the time of measurement, when measurement is performed using a mΩ meter 5 of the AC four-terminal method. Measuring battery 6
The voltage detection line and the current carrying line of the mΩ meter 5 are connected to the anode terminal 7 of the mΩ meter 5, the current carrying line of the mΩ meter 5 is connected to the cathode terminal 8 of the measuring battery 6, and the mΩ meter 5 is connected to the voltage detecting terminal 3 of the measuring battery 6. A total of five voltage detection lines are connected. When the mΩ meter 5 is operated, an alternating current is passed from the anode terminal 7 to the cathode terminal 8, and the value obtained by dividing the alternating current voltage component between the anode terminal 7 and the voltage detection terminal 3 by the flowing current is calculated as the resistance value of the mΩ meter. 5 is displayed.

FIG. 3 shows the change in capacity and resistance value when this battery was subjected to a high temperature accelerated life test. As shown in FIG. 3, the resistance value increased as the life progressed, and at the end of the life it increased to about three times the initial value. Therefore, it is possible to estimate the lifespan by measuring this resistance value.

0010

[Effects of the Invention] As described above, the present invention provides a stationary sealed lead-acid battery having a voltage detection terminal connected to the foot of the anode plate, so that current can be passed from the anode terminal to the cathode terminal. The potential difference between the anode terminal and the foot of the anode plate can be measured, and by dividing this measured value by the applied current, the life span due to elongation and corrosion of the anode plate can be estimated.

[0011] This measured value according to the present invention is actually caused by the current flowing between the anode grid substrate and the active material;
It has extremely great industrial value, such as being able to electrically estimate changes in the current collecting capacity of the anode grid base due to elongation and corrosion of the anode grid base.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a stationary sealed lead-acid battery according to the present invention.

FIG. 2 is an explanatory diagram showing a connection state between a mΩ meter and a stationary sealed lead acid battery of the present invention.

FIG. 3 is a characteristic diagram showing the resistance value and capacity change of the stationary sealed lead-acid battery of the present invention.

[Explanation of symbols]

1 is an anode plate, 2 is a foot part, 3 is a voltage detection terminal, 4 is a lead wire, 5 is a mΩ meter, 6 is a measurement battery, 7 is an anode terminal, and 8 is a cathode terminal.

Claims (1)

[Claims] [Claim 1] The method is characterized in that when a current is applied to the anode terminal and the cathode terminal, the voltage between the anode terminal and the foot of the anode plate is measured, and the evaluation is made by dividing the measured voltage by the current. A method for detecting the deterioration state of sealed lead-acid batteries.