JPS60151960A - Closed type lead battery - Google Patents

Abstract

PURPOSE:To prevent the corrosion of a connecting conductor due to sulfuric mist at the time of charging by forming the connecting conductor, which passes through a concave section formed on the edge of the partition wall between adjacent cells, with a lead alloy practically including no antimony. CONSTITUTION:In plural cells 1a, 1b of a battery case 1, which are separated by a partition wall 2, are placed a positive electrode cluster 4 and a negative electrode cluster 6 with an electrolyte-disfluidifying retainer inserted between adjacent electrode plates. And a positive electrode strap 5 and a negative electrode strap 7 are connected with a connecting conductor 9 passing through a concave section 3 formed on the edge of the partition wall 2. At this time, the connecting conductor is made using an antimony-free lead alloy which contains less than 0.1% of calcium and less than 0.5% of tin or less than 2.0% of tin with no calcium. In this way, it is made possible to prevent a local corrosion in the intercell connection area at the time of charging, improving the useful life of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to sealed lead-acid batteries, and more particularly to improvements in the material of connecting conductors that connect adjacent cells.

Conventional technology In general, in sealed lead-acid batteries, a retainer made of ultrafine glass fibers is impregnated with an electrolytic solution made of dilute sulfur, and the electrolytic solution is made into a silica colloid by fc and D to make the electrolytic solution non-fluid. We are trying to In this case, since the discharge capacity is regulated by the concentration of the electrolyte, it is necessary to keep the concentration of the electrolyte high.

In this German battery, there is no free electrolyte, but
Sulfuric acid mist is generated during charging, and it is inevitable that the mist will adhere to the connecting conductor connecting adjacent cells. Therefore, if this glazed battery is used for long-term applications such as floating charging at 40°C, the connected conductors will be exposed to highly concentrated sulfuric acid for a long period of time, causing corrosion of the connected conductors. It becomes easier to wake up. In a sealed lead-acid battery, when each cell chamber is sealed, the anode strap portion of the connecting conductor undergoes so-called anodic oxidation and corrodes, but the cathode strap portion of the connecting conductor does not corrode.

However, in recent years, in order to improve productivity and reduce size and weight, the inter-cell connection part that connects the anode strap part and the cathode strap part in adjacent cell chambers is arranged by penetrating the four parts formed in the partition walls between the cell chambers. Sealed lead-acid batteries have come into use. In a sealed lead-acid battery in which adjacent cell chambers are communicated through recesses in the partition wall, not only the anode strap but also the cathode strap of the connecting conductor corrodes during charging, resulting in localized corrosion at the connection between cells. This has the disadvantage of causing a decrease in quality and a decrease in service life.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a sealed lead-acid battery that improves quality and life by suppressing corrosion of connecting conductors that connect adjacent cells.

Structure of the Invention The structure of the present invention is such that a plurality of cell chambers are arranged in parallel in a straight line, and a group of anode plates of adjacent cells is connected by a connecting conductor penetrating a recess formed in a partition wall between adjacent cell chambers. The sealed lead-acid battery is characterized in that the connecting conductor substantially contains antimony and is made of a lead alloy.

With the above configuration, corrosion of the connecting conductor connecting adjacent cells can be suppressed, so that quality can be improved and life can be extended.

Example Hereinafter, the present invention will be explained in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a battery case made of synthetic resin or the like, and this battery case 1 has a shape in which a plurality of cell chambers 1a and lb are arranged in parallel in the 111-line direction. Cell chamber 1a adjacent to battery case 1
*1b is divided by a partition wall 2, and a recess 3 is formed in this partition wall 2. A group of electrode plates is arranged in each cell chamber,
Although not shown, a retainer made of a thin glass fiber mat with a diameter of about 1 μm is interposed between adjacent electrode plates of different polarities in this electrode plate group. In addition, the taker is impregnated with an electrolytic solution made of dilute sulfuric acid to make the electrolytic solution non-fluid. Anode plate group 401i in cell chamber la! Extreme strap part 5
and the cathode strap section 7 of the cathode plate group 6 in the adjacent cell chamber lb are connected by the inter-cell connection section 8, and the anode strap section 5 and the cathode strut, and the f section 7 and the inter-cell connection section 8 are integrally formed. The connecting conductor 9 is formed by the connecting conductor 9. This connecting conductor 9 is made of lead alloy that does not substantially contain antimony (hereinafter referred to as antimony-free lead alloy). As this antimony-free lead alloy, for example, one containing calcium of 0.1 or less and tin of 0.596 or less, or practically no calcium and containing 2.0% or less of tin, may be used. I can do it. Incidentally, the above-mentioned battery case 1 is closed with a rice cooker (not shown).

In order to confirm the effects of the present invention, tests were conducted to compare the degree of corrosion of the connecting conductors by changing the material of the connecting conductors. In the test at
), 5 cathode plates of the same size and capacity as the anode plate, and thickness; 2. Om, 'height; 128 wns width:
A group of electrode plates in which 175 tnm retainers are stacked alternately is housed in one cell chamber, and this cell is 611S:l-
12Y type batteries were prepared which were stacked and arranged in parallel in a straight line. Add 25% dilute sulfuric acid with a specific gravity of 1.345 to this 12V battery.
A cycle of 0CC injection, discharging at 25A for 1 minute in a 40℃ atmosphere, and then charging at 14.8V for 10 minutes was repeated for 5,000 cycles to remove corroded materials from the connecting conductors. It was dropped and the amount of forgery was measured. The results are shown in the table below. When the connecting conductor is made of a lead alloy containing antimony, a large amount of corrosive material is collected and the corrosion progresses accordingly. .5% or less of tin when the connecting conductor is formed of an antimony-free lead alloy and 2.0% or less of tin.
It has become clear that when the connecting conductor is formed of an antimony-free lead alloy containing the following elements 4 and no calcium, there is very little corrosion. In addition, when the connecting conductor is formed of a lead alloy containing antimony, even if it contains less than 0.1% of calcium and less than 0.5% of tin, it contains no calcium and less than 2.0% of tin. It has become clear that a large amount of corrosive substances are produced even when tin is contained.

According to the above, the connection is made with an antimony-free lead alloy having b, o, i% or less of calcium and 0.5% or less of field, or an antimony-free lead alloy that does not contain calcium and contains 2.0% or less of tin. It can be seen that when a conductor is formed, corrosion of the connecting conductor can be significantly suppressed.

Effects of the Invention As described above, according to the present invention, the connecting conductor that penetrates the recess formed in the partition wall between adjacent cell chambers is made of a lead alloy that does not substantially contain anti-silicon. This has the advantage that corrosion of the connecting conductor can be suppressed, and local corrosion of the inter-cell connection portion of the connecting conductor can be suppressed, thereby improving quality and life.

[Brief explanation of the drawing]

The figure is a perspective view showing the main parts of a sealed lead-acid battery to which the present invention is applied. DESCRIPTION OF SYMBOLS 1... Battery case, la+1b... Cell chamber, 2... Partition wall, 3... Recessed part, 4... Anode plate group, 6... Cathode plate group, 9... Connection conductor.

Claims (3)

[Claims] (1) A plurality of cell chambers are arranged side by side, and the elm plate group and cathode plate group of 14 adjacent cells are connected by a connecting conductor passed through a recess formed in the partition wall between adjacent cell chambers. 1. A sealed lead-acid battery, characterized in that the connecting conductor is made of a lead alloy that does not substantially contain antimony. (2) The sealed lead according to claim 1, wherein the connecting conductor is made of a lead alloy containing 0.1q6 or less calcium and 1.5% or less calcium. Storage battery. (3) The connecting conductor is made of a lead alloy that contains a field of 2.0 fo or less and does not substantially contain calcium.f! : A sealed lead-acid battery according to claim 1.