JPH04223065A - Lead storage battery - Google Patents

Abstract

PURPOSE:To reduce the equipment, the time, and the cost by using a small capacity type of lead storage battery with a physically similar figure set as a pilot cell when the service life of a large capacity type of lead storage battery is decided. CONSTITUTION:A 15Ah battery which has a similar figure physically with a 200Ah sealed type lead storage battery can bear sufficiently practically in the scope of 0.92 to 0.96 in the coefficient of correlation in a 71 deg.C acceleration test. As a result, by setting several sets of small capacity type storage batteries with physically similar figures as pilot cells to a large capacity type of lead storage battery, and by carrying out the capacity test periodically, the capacity of the large capacity type battery can be inferred by using a relatively small equipment, a short time, and a low cost without stopping the battery system. And the similarity ratio can be selected as desired according to the limitation of the manufacture of the battery and the available equipment.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery whose lifespan can be determined.

0002

2. Description of the Related Art Generally, the lifespan of large-capacity lead-acid batteries is determined by measuring changes in battery voltage, specific gravity, internal impedance, etc., then extracting deteriorated batteries and performing a capacity test.

0003

Conventional capacity tests must be performed with the large-capacity lead-acid battery system shut down. Furthermore, a large-capacity battery requires an enormous amount of equipment, and there is a problem that time and costs increase significantly.

0004

[Means for Solving the Problems] The present invention determines the lifespan of small-capacity lead-acid batteries having physically similar shapes.

[0005]

[Operation] Since they are physically similar in shape, there is a good correlation between the lifespan of large-capacity lead-acid batteries and similar small-capacity lead-acid batteries under the same environment. That is, by examining the capacity of a similar small capacity lead acid battery, the lifespan of a large capacity lead acid battery can be determined.

[0006]

EXAMPLE A 15Ah battery physically similar to a 200Ah sealed lead acid battery was manufactured. The number of manufactured pieces was 36 pieces.

[0007] This battery and 36 batteries of 200Ah were combined into 71
Evaluated by °C accelerated life test. When we conducted a capacity test every 20 days and investigated the correlation between capacities, the correlation coefficient was 0.92~
It was in the range of 0.96. This correlation coefficient is sufficiently durable for practical use, and the battery of the present invention can be used as a substitute for determining the life of a large capacity. Note that the similarity ratio may be arbitrarily selected based on constraints on battery production and equipment constraints.

[0008]

As described above, the lead-acid battery of the present invention allows the lifespan of a large-capacity lead-acid battery to be determined using a small-capacity lead-acid battery, so there is a great advantage in capacity testing equipment and time. Furthermore, there is no need to stop the large-capacity lead-acid battery system. In the present invention, it is sufficient to set several pilot cells in a large-capacity lead-acid battery system, and the capacity of the large-capacity battery can be estimated by periodically conducting a capacity test. In this way, it is possible to reduce the equipment, time, and cost of lifespan determination, which until now required extremely labor, and has great industrial value.

Claims (1)

[Claims] 1. A lead-acid battery characterized in that the life of a large-capacity lead-acid battery is determined using lead-acid batteries having physically similar shapes.