JPH07312233A - Deterioration diagnostic device for storage battery - Google Patents

Abstract

PURPOSE:To provide a deterioration diagnostic device for a trickle or float using lead-acid battery facility used for an AC non-interruption power source device or communication DC power source device which detects and display the life period of a storage battery or the remaining years to the life from its setting environmental temperature. CONSTITUTION:The temperature data 15 of a storage battery surface is continuously measured by a microprocessor 7. The average temperature is also computed, and when it is instructed to indicate whether the storage battery is in the life period or not is instructed, the microprocessor computes the standard life years in reference to the data of a table from the average temperature and the elapsed years after the set of the storage battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacity deterioration diagnosing device according to the number of years elapsed since the installation of a storage battery.

[0002]

2. Description of the Related Art Conventionally, as a method for detecting the life and deterioration degree of a lead storage battery, (1) a method of detecting the variation of each cell voltage of the storage battery (described in JP-A-2-304876), (2) lead A method of detecting by measuring the specific gravity of sulfuric acid which is an electrolytic solution of a storage battery, (3) a method of detecting by an increase in differential internal resistance (described in JP-A-63-168582), and (4) degree of expansion of a positive electrode plate of a lead storage battery. Detection method (described in JP-A-62-47975),
(5) Method of detecting decrease of electrolyte by liquid level sensor, (6) Method of detecting by periodically performing discharge test on storage battery, (7) Life time based on accumulated charge quantity and accumulated charge quantity For estimating (see JP-A-2-288075)
No.), (8) A method of estimating the degree of deterioration from the number of years that the storage battery has been installed, (9) A deterioration coefficient is calculated from a secular average value of the environmental temperature of the installation of the storage battery using an arithmetic expression using a personal computer or the like. Method (JP-A-5-3150)
No. 15 publication).

Normally, the deterioration state of the capacity is diagnosed comprehensively from the measurement results of these plural items, but the charging voltage of the storage battery is controlled within the normal range, and in the case of the replenishment type lead storage battery, the electrolyte solution is within the normal range. If the battery is controlled by the above, the environmental temperature of the storage battery installation has the greatest effect on the life of the battery, except when defective products are included. And the above-mentioned conventional method (6) is
Since there is a possibility that the equipment will be stopped due to an accident during the discharge test, it cannot be implemented with a backup power source such as communication equipment. Regarding the above-mentioned conventional method (8), although the installation environment of the lead storage battery may be installed in a constant temperature place with air conditioning equipment, most of them are equipped with a ventilation fan and have the same environment temperature as the external environment. In most cases, it is installed in an environment where the seasons change day and night. Nevertheless, the deterioration rate due to the number of years passed is usually 20-
Life is estimated assuming a constant environment of 25 ° C. Normally, a lead-acid battery has a long life at a lower installation environment temperature and a smaller capacity deterioration up to a certain temperature, and conversely has a shorter life at a higher installation environment temperature.

For example, the life of using a trickle or float is only 15 degrees at 25 ° C. and 40 ° C., but the life at 40 ° C. is about 1/3 of 25 ° C., and the installation environment temperature is lead acid battery. Has become one of the major factors that affect the life of the. Therefore, if the installation environment temperature of the storage battery equipment is not constant, the difference between the estimated life and the actual life becomes large, and the discharge duration required during an actual power failure cannot be maintained. After the replacement, the discharge performance was examined and the performance was maintained sufficiently, and there was a problem such as waste of resources. Further, the above-mentioned conventional methods (1) to (6) are only methods for determining whether or not the battery has reached the end of life, and the remaining number of years remaining until the end of life cannot be estimated at the environment temperature at which the storage battery is installed. There was a problem that the deterioration situation could not be reflected in the plan.

Further, in the above-mentioned conventional method (9), a personal computer or the like must be used in order to perform a complicated exponential operation, and it is difficult to realize it because the program capacity increases only with the microprocessor installed in the storage battery. There was a problem.

[0006]

The problems of the above-mentioned conventional methods are mainly to determine whether or not the storage battery has reached the end of its life.
The remaining life years cannot be grasped with respect to the installation environment temperature, and the estimation calculation cannot be calculated unless a personal computer or the like is used.

An object of the present invention is to solve the above-mentioned conventional problems, and not only to determine whether the storage battery is at the end of its life, but also to determine how many years the remaining life is left. An object of the present invention is to provide a deterioration diagnosing device capable of displaying and outputting without performing complicated index calculation.

[0008]

A deterioration diagnostic apparatus for a storage battery according to the present invention continuously measures the surface temperature of the storage battery in the use of a trickle or a float by a microprocessor having a surface temperature measuring means of the storage battery, and the surface temperature is When the temperature is below the reference temperature, the average temperature is calculated as the reference temperature, and the storage battery installation date previously installed in the memory and the standard service life corresponding to the average temperature are referred to determine whether the storage battery is at the end of its life or It is possible to detect the number of remaining years until the next few years without performing complicated exponential arithmetic processing.

[0009]

According to the configuration of the present invention, it is possible to accurately determine whether the storage battery is at the end of its life and how many years are left until the end of its life at the installation environment temperature of the target storage battery without complicated index calculation. It can be estimated.

[0010]

EXAMPLES Examples of the present invention will be shown below.

FIG. 1 shows the transition of the capacity deterioration rate depending on the storage battery temperature and the number of years the storage battery has been installed, based on an arithmetic expression, for a sealed lead storage battery.

In FIG. 1, 1 indicates that the storage battery temperature is always 20 ° C.
(Reference Temperature of Sealed Lead Acid Battery of Example of Present Invention) Shows a standard transition of the aged capacity deterioration coefficient when the initial capacity is set to 1.0 according to the elapsed years when used in the following environment. . Similarly, the average temperature of 2 to 5 is 25,3.
The change of the aged capacity deterioration coefficient in the case of 0,35,40 degreeC is shown. Here, for example, when the life is set to the time point of the horizontal line 6 drawn to the deterioration coefficient 0.9 in FIG. 1, that is, the time point estimated to be 90% of the initial capacity, the lines 1 to 5 and 6 are set.
The number of years of intersection coordinates of the horizontal line is calculated in advance by exponential calculation, and this is set in the memory of the microprocessor as the standard number of years of life at each average temperature. 20 this
Table 1 shows the standard life at the corresponding average temperature, which is the number of years at the intersection coordinates in units of 1 ° C from 40 ° C to 40 ° C.

[0013]

[Table 1]

FIG. 2 is a block diagram showing a deterioration diagnosing device for a lead storage battery according to an embodiment of the present invention.

In FIG. 2, 7 is a microprocessor which is a control / arithmetic unit, 8 is a program memory, and 9 is the date of installation of the storage battery, the standard life data at each average temperature in Table 1 and the dischargeable time of the storage battery. This is a data memory with a battery backup that stores standard characteristic data of, and uses an IC-RAM card or the like. Reference numeral 10 is a calendar IC, which is used to calculate the number of years elapsed after the storage battery equipment is installed from the installation date of the storage battery stored in the memory 9 and to display the current time on the display device 13.
11 is an input / output interface, which is the remaining number of years until the life of the operation switch of 12 and the storage battery targeted by the present invention,
A display device 13 such as a liquid crystal display for displaying the dischargeable time during a power failure
, Storage battery temperature data 15, storage battery voltage data 1
6. An A / D converter 14 for taking analog data of the discharge current data 17 of the storage battery into the microprocessor 7 is connected.

Next, the calculation process for determining the number of years of life in the deterioration diagnosing device according to the present invention will be described with reference to the flowchart of FIG.

1. First, the temperature data on the surface of the storage battery (15)
Is measured once per hour, and when the measured temperature is lower than the reference temperature, it is used as the reference temperature (for example, when the reference temperature is 20 ° C. and the surface temperature is 15 ° C., the surface temperature is 20 ° C.). Taken in 7, average temperature (t)
The process of calculating is continuously repeated.

2. Next, when the calculation instruction for life judgment by the operation switch 12 or the calculation interval time by the program is reached (18), from the current date of the calendar IC 10 and the storage battery equipment installation date stored in the memory 9, the number of years elapsed after the storage battery is installed. (Y) is obtained (19).

The number of years of service life (YL) corresponding to the average temperature (t) continuously calculated in 3.1 is obtained from the data (Table 1) preset in the data memory 9 (2
0). However, the decimal point of the average temperature (t) is rounded up to obtain a safe side.

4. The number of years (YL) after installation is subtracted from the number of years of life (YL) (21), and if the result is positive, it is displayed as the number of years remaining until the end of life (22). If it is negative, the storage battery is at the end of its life. Is displayed (23).

Table 2 shows the deterioration diagnosis apparatus of the present invention, which is used to repeatedly store 25 units of sealed lead acid batteries having a voltage / nominal capacity of 2V150Ah while repeatedly changing the temperature at 40 ° C. and room temperature at 12-hour intervals. Trickle charge at a voltage of 2.25 V / cell, discharge to 1.8 V / cell at a constant current of 0.1 CA once every 6 months, and the initial discharge capacity was set to 100. Is. The test results of the conventional method, which is assumed to be constant at 40 ° C., are also shown. As is apparent from the above, in the conventional method, when such an environmental temperature change occurred, it was assumed that the temperature was constant at 40 ° C., and the life was estimated to be about 3.5 years. As a result, the period until the life was even longer, and it was proved that the life was almost close to the estimated life according to the present invention.

[0022]

[Table 2]

[0023]

As described above, the deterioration diagnosing device according to the present invention can detect the life time of the target storage battery more accurately than before without performing the discharge test of the storage battery, and can detect the life time of the storage battery until the life time of the storage battery. The remaining years can be detected and displayed, and the renewal plan of the storage battery equipment can be efficiently prepared.

[Brief description of drawings]

FIG. 1 is a transition diagram of the deterioration coefficient of a sealed lead-acid battery used to determine the standard life in the example of the present invention.

FIG. 2 is a block diagram of a deterioration diagnosis device according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a process of calculating a life time in the embodiment of the present invention.

[Explanation of symbols]

 7 Microprocessor 8 Program memory 9 Data memory 15 Surface temperature measurement data of lead acid battery

Claims (1)

[Claims] 1. A microprocessor equipped with means for intermittently measuring the surface temperature of a trickle or float storage battery continuously and automatically measures the surface temperature of the storage battery to obtain an average temperature (t) (however, t is the average temperature of the surface of the storage battery that is continuously measured and calculated as the reference temperature when the surface temperature of the storage battery is equal to or lower than the reference temperature. The standard life years (YL) at each average temperature for each stage are compared and collated with the continuously calculated average temperature (t),
The number of years that have passed since the battery was installed (Y) is the average temperature (t)
When it exceeds the standard life (YL), it is displayed and output, and when it does not exceed the standard life (YL), YL-Y is displayed as the remaining years (YR) until the life. A deterioration diagnosis device for a storage battery, which is provided with a function of outputting.