JPS5951485A - Charging process of enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To prevent deterioration of positive pole plate by detecting concentration of oxygen in the space of cell and suspending supply of current when such concentration becomes the maximal value and is lowered to a value lower than the specified one on the occasion of charging an enclosed lead storage battery by the cyclic reaction of oxygen. CONSTITUTION:On the occasion of charging an enclosed lead storage battery through cyclic reaction of oxygen utilizing a lead alloy not including antimonuy as the lattice in view of preventing loss of water in the electrolyte, a sensor 6 is provided within a reservoir 1 in order to measure a partial pressure of oxygen gas, thereby concentration of oxygen in the cell space is detected and the control is carried out so that the supply of current from the charger 8 is suspended when the concentration of oxygen becomes the maximal value and then becomes lower than the specified value. Accordingly, a partial pressure of oxygen gas in the cell space can be set low by adequately selecting a charging current and thereby deterioration of positive pole plate can be prevented through formation of barrier due to the oxygen gas by oxidating the surface of lattice.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for charging a single sealed lead acid battery using an antimony-free lead alloy grid.

Sealed lead-acid batteries based on oxygen cycling reactions typically use antimony-free lead alloys, such as lead-calcium, in the grid to prevent loss of electrolyte water. A positive electrode using this type of alloy may reach the end of its life prematurely due to the formation of a so-called barrier, in which an electrically insulating material such as -lead oxide forms at the interface between the lattice and the active material.

The present invention investigates the cause of this barrier formation and prevents its formation using a novel photoelectric method, and aims to stably extend the life of sealed lead-acid batteries.

The gist of the present invention is to detect the oxygen concentration in the cell circular space, and to cut off the charging current when the oxygen concentration reaches a maximum and then falls below a predetermined value.

In a battery based on an oxygen cycle reaction, the gas phase in the cell circular space is in contact with the negative active material. The deterioration state of the T-shaped To plate was examined by changing the concentration of oxygen gas in the gas phase and leaving it for a while, and the results are shown in Table 1.

The storage conditions were 1 month at a temperature of 50°C, and the performance of the main plate was expressed by the 10 minute rate discharge capacity.

As is clear from Table 1, no deterioration is observed when the partial pressure of oxygen gas is 0.08 or less, but it is significantly degraded when it is 0.2 or more. The reason for this is thought to be that oxygen gas in the space within the cell oxidizes the lattice surface to form a barrier. However, in order to prevent this deterioration, the partial pressure of oxygen gas in the space within the cell during discharge of the battery may be set to 0.1 atm or less.

Next, Table 2 shows the results of investigating the partial pressure of oxygen gas in the cell interior space and the deterioration and softening of the positive plate of the γ cell by charging with a minuscule current of 10 hour rate discharge current.

The charging conditions were one month in an atmosphere with a temperature of 80°C, and a positive I
! The tentative performance is expressed by the minute rate discharge capacity.

As is clear from Table 2, there is almost no deterioration in the positive and temporary cases, regardless of the magnitude of the partial pressure of oxygen gas.

Furthermore, charge at a current of 4 times the discharge current at a rate of 10 hours.
The changes in the partial pressure of oxygen gas in the cell interior space were investigated and the results are shown in FIG. Before this charge, completely discharge the battery at a rate of 10 hours. Oxygen gas molecules account for approximately 90% of the electrical charge
The abrasive strength is indicated when , and after μ it decreases as charging progresses.

From the above results, if the photoelectric current is selected appropriately, it is possible to keep the partial pressure of oxygen gas in the space inside the cell quite low. The deterioration of Yangkari becomes ridiculous.

Next, the present invention will be explained with reference to an embodiment shown in FIG. (1) is the battery case and lid, (2) is the positive 1 temporary, (8) is the negative positive plate, (4) is the separator, and (5) is the liquid retaining material. It contains dilute sulfuric acid. (6) is a sensor that measures the partial pressure of oxygen gas, (7) is an exhaust section, and 181 is a current that changes depending on the partial pressure of oxygen gas. This is a single charger that has the function of controlling the rice field.

Section 8 shows the results of an intermittent cycle test in which a two-response wax test is conducted every month. Photoelectric method HatA11. t
10 hR constant tm discharge'' II 1.Wt electricity amount 120%
, (B) is jft large! fiha 10 hR, maximum Wl
RF: 2.40 V/cell CD constant current/electronic: 16
Time, (C) is according to the present invention, 10httWl
With the current, the partial pressure of the oxygen gas in the cell exceeds 2.40 V/cell, and the voltage of the light changes to 2.40 V/cell, and the partial pressure of the oxygen gas decreases to about 0.08. Here's how to end charging.

Table 3: Charged by the method according to the present invention, there is almost no decrease in capacity even after 86 months, but for simple constant current or constant current Hikideno Koden batteries, the capacity decreases considerably after about 80 months. As described above, the present invention improves the deterioration of the positive plate of a sealed lead-acid battery by using a charging method.

[Brief explanation of drawings]

The first leap is a characteristic diagram showing the relationship between Koden Denryu and oxygen gas molecules in the space inside the cell, ij! FIG. 2 is a schematic longitudinal cross-sectional view of the main parts of the lead-acid battery according to the present invention. 2...Positive plate, 8...Negative plate, 4
... Separator, 5 ... Liquid retention,
6... Oxygen gas partial pressure measurement sensor, 8.
...Charger. 6 all at once 1st get 9 amount (%) A Z diagram

Claims (1)

[Claims] (Photoelectric method for a sealed lead-acid battery that detects the oxygen concentration in a circular space of 11 cells and cuts off the current when the value reaches a small value and then drops below a predetermined value. (2) Oxygen concentration is greater than a predetermined value, the hook T is 1
Claim No. 2 (
1) Method for charging a sealed lead-acid battery as described in section 1).