JPS5848367A - Lead storage battery - Google Patents

Abstract

PURPOSE:To enable a smooth charging of a lead storage battery of an electrolyte limiting type by equipping the battery with auxiliary electrodes in addition to main positive and negative electrode plates, and connecting the auxiliary electrodes to the positive electrode plate in charging the battery after it is over-discharged. CONSTITUTION:Negative electrode plates 1 and a positive electrode plate 2 each prepared by packing a grid made of lead or a lead alloy with a given active material paste, are arranged with glass separators 4 interposed between them. At the same time, each auxiliary electrode 3 made of a lead plate is provided between two glass separators 4. Here, the plates 1, the plate 2 and the electrodes 3, respectively, are connected to external terminals (A), (B) and (C). In charging such a battery as above after it is over-discharged, the external terminal (C) is connected to the terminal (B) before the battery is charged. Therefore, during the charging of the battery, charging proceeds between the plates 1 and the electrodes 3, the concentration of electrolyte is increased due to sulfate ions discharged from the plates 1, and the internal resistance of the battery is reduced. As a result, a charging current fed to the plate 2 can be increased, and a smooth charging can be performed.

Description

[Detailed Description of the Invention] The present invention relates to a lead-acid battery, and particularly to a so-called lead-acid battery with a retainer in which the amount of electrolyte is limited so that there is no free electrolyte, and it is possible to prevent over-discharging and subsequent charging. The purpose is to improve the process so that it runs smoothly.

In general, a constant voltage charging method is adopted for lead-acid batteries (KJ) in order to prevent corrosion of the lattice body due to overcharging. On the other hand, as is well known, in lead-acid batteries, the electrolyte is involved in the battery reaction, so if the anode plate is left in the battery compartment after over-discharging or is left connected to a load, a high temperature buildup will occur between the lattice body and the active material interface. A thin layer of lead sulfate is produced which acts as a resistor. In particular, in the electrolyte volume limited type KJ5, the electrolyte concentration decreases with the formation of the lead sulfate thin layer mentioned above and the internal resistance increases.
Therefore, when a battery in such a state is charged at a constant voltage, there is a problem that only a small charging current is applied and sufficient charging is not achieved.

The present invention has been made in view of this point, and its gist is to incorporate an auxiliary electrode that is electrically connected to the anode plate during charging after being left over-discharged, in addition to the one-day anode plate. be. The auxiliary electrode is preferably acid-resistant and has no substantial capacity, such as a lead plate.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1/Figure 1 shows a vertical cross-sectional view of a battery in one embodiment;
1) and (2) are a cathode plate and an anode plate made by filling a predetermined active material paste into a grid made of lead or a lead alloy. (3) is an auxiliary electrode made of a lead plate, (4) is a glass separator, +5) +61 is a resin battery case and battery case lid,
There are a cathode external terminal (4) and an anode external terminal (4) on the outside of the battery case lid.
) and the auxiliary pole external terminal (q is derived.

FIG. 2 shows a vertical cross-sectional view of a battery in another embodiment.
The four points that are different from those shown in the figure are that the battery case (5) is coated with metal, and other than that, the same figure numbers indicate the same elements.

In any of these battery structures, when charging is performed after overdischarging, the auxiliary electrode external terminal (C) is electrically connected to the anode external terminal (B).

Next, a battery of the present invention with a capacity of 3 μH and a conventional battery with the same capacity but without an auxiliary electrode were prepared, and after normal discharge, they were left for 4 months, and then connected to a resistor with a Vc of 56Ω and overdischarged for 2 months. When voltage charging was carried out for 24 hours, it was found that the battery of the present invention had approximately the same capacity as the battery capacity obtained during normal discharging, indicating that it was sufficiently charged. It was found that almost no capacity was obtained and the battery was hardly being charged.

Considering the reason for this, when charging after overdischarging, according to the battery of the present invention, charging progresses between the auxiliary electrode and the cathode plate, which are electrically connected to the anode plate, and sulfate ions are released from the cathode plate. This is thought to be because the electrolyte concentration increases, which improves the conductivity and lowers the internal resistance of the battery, increasing the charging current applied to the anode plate and ensuring sufficient charging.

Note that when the discharge capacity of the cathode plate is set to be larger than that of the anode plate, the auxiliary electrode may be connected to the cathode plate during normal charging and discharging. The reason for this is that since it is connected to the cathode plate, it will not be oxidized and will not become inactive.

As described above, according to the present invention, it is possible to smoothly charge an electrolyte-limited lead battery after overdischarging, and its industrial value is extremely large.

[Brief explanation of the drawing]

The drawings are all related to the present invention; FIG. 1 shows a longitudinal sectional view of a battery in one embodiment, and FIG. 2 shows a longitudinal sectional view of a battery in another embodiment. (1)...Cathode plate, (2)...Anode plate, +31 +
31... Auxiliary pole, (4)... Separator, +51
+51...Battery container, (6)...Battery container lid, (N...Cathode external terminal, (B)...Anode external terminal, (C)...
Auxiliary pole external terminal.

Claims (1)

[Claims] ■ A cathode and anode plate, a separator that isolates these plates, an electrolyte in an amount that is impregnated and held in the plates and the separator and is limited so that no free electrolyte exists; A lead-acid battery comprising an auxiliary electrode electrically connected to the anode plate during charging after being discharged and left standing. (2) The discharge capacity of the cathode plate is larger than that of the anode plate, and the auxiliary electrode is electrically connected to the cathode plate during normal charging and discharging.
(Lead-acid batteries listed in section 3.