JPS58164146A - Lead storage battery - Google Patents

Abstract

PURPOSE:To solve the trouble caused by the initial growth of a base plate in a batttery cycle test as well as to prevent a battery from short-circuiting whereby making the battery usable for a long period of time, by having a thermoforming active material, which adds charge and discharge cycles in the desired frequency to an anode active material, constituted of an anode plate filling a lead base plate. CONSTITUTION:Anode active materials 3 and 3 composed of a mixture of dilute sulfuric acid and lead powder are used for filling the holes 2 and 2 of an Sb-Pb alloy base plate 1, making the plate 1 an anode. For your reference, the number 4 shown in illustration is of the lug part. After a battery constituted of the anode and a separately prepared cathode is chemically formed, the thermoforming active material that is obtained by repeating charge and discharge cycles three times at a rate of five-hour duration is separated from the said base plate. This thermoforming active material is used for filling a Pb-Ca-Sn alloy base plate, making this base plate an anode plate, and an NS40z battery is secured by making a filled plate by means of the conventional process a cathode plate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in lead-acid batteries, and aims to provide a lead-acid battery with a long service life.

In recent years, lead-acid batteries, especially lead-acid batteries for automobiles, have been required to be as light as possible in order to achieve low fuel consumption from the viewpoint of energy conservation, as well as to be maintenance-free, such as requiring no water refilling. It is something that exists. In order to meet these demands, it is necessary to reduce the weight of the electrode plate and substrate, or to reduce the weight of the electrode plate and the lead alloy used in the electrode plate.
Efforts are being made to reduce the content of b-source wood as much as possible, or to replace it with, for example, a pb-Ca-8n alloy that does not contain any sb elements.

However, low sb-pb gold alloy or Pb-Ca
-sn alloys have inferior mechanical strength compared to normal sb-pb gold alloys, and they not only cause problems such as deformation of the board during handling or filling the board with active material. During repeated charging and discharging as a battery, the positive electrode plate undergoes growth and a smoke path is generated, making it impossible to extend its life.

As a result of intensive research in an attempt to overcome these drawbacks of the present invention, we have discovered a lead-acid battery with a long service life. That is, the present invention is characterized by comprising a positive electrode plate in which a lead substrate is filled with an aged active material which has been subjected to a desired number of charge/discharge cycles.

In the lead-acid battery of the present invention, the active material is subjected to charging/discharging cycles in advance, and as the charging/discharging cycle is repeated, the active material swells, resulting in a new growth phenomenon in which 41 and 9 extend downward. The active material falls off and causes a short circuit. Therefore, even though charging and discharging are applied to the active material, j1
In order to prevent the swollen active material from growing, it is possible to use some method in advance, such as filling the active material into a substrate or filling it in a bag and charging and discharging it to cause it to swell to some extent. The present invention was developed based on the discovery that the growth phenomenon described above can be prevented by incorporating a storage battery. However, if a large number of charging and discharging cycles are applied to the active material so that it does not swell at all, the active material will deteriorate and will no longer be able to perform its original function, causing the active material to swell. In consideration of the battery life and battery life, charging and discharging of the active material is normally performed in about 1 to 10 cycles, and 9 cycles are used.

Note that the active material rapidly swells when charged and discharged, and the purpose can be achieved even if the number of cycles of charging and discharging is as few as one or two times.

Further, when preparing a matured active material, when charging and discharging a lead substrate filled with a positive electrode active material, it is preferable to use a lead alloy containing 8b as the substrate, which has a high mechanical strength.

Next, examples of the present invention will be described.

As shown in Fig. 1, holes 2 and 2 of the sb-pb alloy base hole J having a thickness of about 2 to 3 cm are filled with positive electrode active materials S and S made of a mixture of dilute sulfuric acid and lead powder. Note that 4 is the ear. This positive electrode and a separate negative electrode were prepared to form a stain pond, chemical formation was performed, and charging and discharging were performed for 3 cycles at a rate of 4ik% for 5 hours, and the obtained aged active material was separated from the substrate. This aged active material was filled into a Pb-Ca-8m alloy substrate to form a positive electrode plate, and a conventionally filled plate was used as a negative electrode plate to obtain an N840 Z battery according to the present invention.

Therefore, the present invention battery (4) and the conventional N840 Z battery (B
) were subjected to a charge/discharge cycle test, and the vertical elongation of the positive electrode plate was kept constant. The results are shown in FIG.

Note that the cycle test was conducted with one cycle of discharging (5,6A x 3.5 Hr) and charging (5,6A x 4.5 Hr).
As is clear from FIG. 2, the lead-acid battery of the present invention showed a significantly lower elongation rate of about 50% or less compared to the conventional storage battery a (ml).

According to the lead-acid battery of the present invention, the problems caused by the initial substrate glow 1 in the battery cycle test are eliminated, short circuits of the battery are prevented, and the battery can be used for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram for obtaining an aged active material in the lead-acid battery of the present invention, and Fig. 2 is a graph showing the relationship between the number of charge/discharge cycles and the elongation rate of the positive electrode plate in the lead-acid battery of the present invention and the conventional lead-acid battery. be. 1... Lead substrate for aged active material device, 2... Hole, 3...
- Active material for positive electrode, 4... ears.

Claims (1)

[Claims] A lead-acid battery comprising a positive electrode plate in which a lead substrate is filled with a positive electrode active material that has been subjected to a desired number of charge/discharge cycles.