JPH043625B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an inter-cell connection conductor (hereinafter simply referred to as a connection conductor) for a sealed lead-acid battery that connects adjacent cells of a sealed lead-acid battery. [Prior art] In general, in sealed lead-acid batteries, the electrolyte is made non-fluid by impregnating a retainer made of ultra-fine glass fiber with an electrolyte made of dilute sulfuric acid, or by making the electrolyte into a silica colloid. It is planned. In this case, since the discharge capacity is regulated by the concentration of the electrolytic solution, it is necessary to keep the concentration of the electrolytic solution high.
In this type of battery, there is no free electrolyte, but sulfuric acid mist is generated during charging, and the mist inevitably adheres to the connecting conductor connecting adjacent cells. Therefore, if this type of battery is used for long-term applications such as floating charging at 40°C, highly concentrated sulfuric acid will remain attached to the connected conductor for a long time, making it easy for the connected conductor to corrode. Become. In particular, in connection conductors that are arranged to penetrate the partition walls between adjacent cell chambers and connect the anode plate group of one cell and the cathode plate group of the other cell in the adjacent cells, the connection conductor is Since not only the anode strap part but also the cathode strap part is corroded, local corrosion occurs at the connection part between the cells, resulting in a disadvantage of deteriorating quality and shortening the service life. [Object of the Invention] An object of the present invention is to provide an intercell connection conductor for a sealed lead-acid battery that can suppress corrosion of the anode strap, the cathode strap, and the intercell connection portion. [Structure of the Invention] The present invention will be described using the reference numerals of the embodiments shown in the drawings. The object is an intercell connection conductor 9 for a sealed lead-acid battery that connects an anode plate group 4 and a cathode plate group 6 of the other cell. In the present invention, the anode strap 5 that connects the ears of the anode plate group 4, the cathode strap 7 that connects the ears of the cathode plate group 6, and the intercell connection part 8 that connects both straps 5 and 7 are integrated. By forming the intercell connection conductor 9 for a sealed lead-acid battery. The intercell connection conductor 9 for the sealed lead-acid battery is formed from a lead alloy that does not substantially contain antimony. With the above configuration, corrosion of each part of the anode strap 5, cathode strap 7, and inter-cell connection part 8, which constitute the connection conductor, can be suppressed. [Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In the figure, 1 is a battery case made of synthetic resin, etc.
This battery case 1 has a plurality of cell chambers 1a and 1b. Adjacent cell chambers 1a and 1b of the battery case 1 are partitioned by a partition wall 2, and a recess 3 is formed in the partition wall 2. Each cell chamber has a group of electrode plates that make up the cell, and between the adjacent anode and cathode plates of this group of electrode plates is a retainer (not shown) made of a pine-shaped thin glass fiber with a diameter of about 1 μm. is mediated. This retainer is impregnated with an electrolytic solution made of dilute sulfuric acid to make the electrolytic solution non-fluid. The anode strap portion 5 of the anode plate group 4 in the cell chamber 1a and the cathode strap portion 7 of the cathode plate group 6 in the adjacent cell chamber 1b are connected by the inter-cell connection portion 8 to form a connected conductor. 9 are configured. This connecting conductor 9 is made of a lead alloy that does not substantially contain antimony (hereinafter referred to as antimony-free lead alloy). For example, this antimony-free lead alloy contains less than 0.1% calcium and 0.5
% or less of tin, or substantially calcium-free and containing 2.0% or less of tin. Note that the battery case 1 is closed with a lid (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 materials of the connecting conductors. In this test, height: 115mm;
Width: 4 paste-type anode plates (each plate has a 5-hour rate capacity of 8.25Ah) with a width of 105 mm, 5 cathode plates with the same dimensions and the same capacity as the anode plates, thickness: 2.0 mm, and height;
A group of electrode plates made by stacking alternately 128mm and 175mm wide retainers is housed in one cell chamber, and this cell is divided into 6 cells.
We prepared 12V type batteries that were stacked one on top of the other in a straight line and arranged side by side. 250 c.c. of dilute sulfuric acid with a specific gravity of 1.345 was injected into this 12V battery, discharged at 25A for 1 minute in an atmosphere of 40℃, and then charged at 14.8V for 10 minutes. A test was conducted by repeating the cycle, and the amount of corrosion was measured by scraping off the corroded material on the connected conductor. 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.
If the connecting conductor is made of an antimony-free lead alloy containing 0.5% or less tin, or if the connecting conductor is made of an antimony-free lead alloy containing 2.0% or less tin and no calcium, corrosive substances will be extremely It became clear that there were few In addition, when the connecting conductor is formed of a lead alloy containing antimony, it may contain 0.1% or less calcium and 0.5% tin, or it may contain no calcium and 2.0% or less tin. It became clear that a large amount of corrosive substances were generated in both cases.

[Table] According to the above, when a connecting conductor is formed with an antimony-free lead alloy containing 0.1% or less calcium and 0.5% or less tin, or an antimony-free lead alloy containing no calcium and 2.0% or less tin. It can be seen that corrosion of the connecting conductor can be significantly suppressed. [Effects of the Invention] As described above, according to the present invention, the connecting conductor, which is formed by integrally forming the anode strap, the cathode strap, and the inter-cell connection portion, is made of a lead alloy that does not substantially contain antimony. , corrosion of the anode strap, cathode strap and inter-cell connection parts can be suppressed, and the quality and life of the sealed lead-acid battery can be improved.

[Brief explanation of drawings]

The figure is a perspective view showing the main parts of a sealed lead-acid battery to which the present invention is applied. 1... Battery case, 1a, 1b... Cell chamber, 2... Partition wall, 3... Recess, 4... Anode plate group, 5... Anode strap, 6... Cathode plate group, 7... Cathode strap, 8... Inter-cell connection portion, 9... Connection conductor.

Claims (1)

[Claims] 1. Disposed through the partition wall 2 between the adjacent cell chambers 1a and 1b to connect the anode plate group 4 of one of the adjacent cells and the cathode plate group 6 of the other cell. An inter-cell connection conductor 9 for a sealed lead-acid battery, the inter-cell connection conductor 9 for a sealed lead-acid battery having an anode strap 5 connecting the ears of the anode plate group 4;
The cathode strap 7 that connects the ears of the cathode plate group 6 and the inter-cell connection section 8 that connects both straps 5 and 7 are integrally formed and are made of a lead alloy that does not substantially contain antimony. An intercell connection conductor for sealed lead-acid batteries. 2 The intercell connection conductor 9 for a sealed lead-acid battery is:
The intercell connection conductor for a sealed lead-acid battery according to claim 1, characterized in that it is made of a lead alloy containing 0.1% or less calcium and 0.5% or less tin. 3 The intercell connection conductor 9 for a sealed lead-acid battery is:
The intercell connection conductor for a sealed lead-acid battery according to claim 1, characterized in that it is made of a lead alloy containing 2.0% or less of tin and substantially no calcium.