JPH03156862A - Clad type lead acid battery - Google Patents

Abstract

PURPOSE:To lengthen the life of a battery by forming a space having a specified distance between a core tip and a lower supporting seat. CONSTITUTION:A core tip 2 and a lower supporting seat 6 are not fixed, and a space whose distance to the lower supporting seat 6 is specified to 1/100-1/20 of the core length is formed between the core tip 2 and the lower supporting seat 6. Even if the core is extended, the detaching of the lower supporting seat is avoided and the life of a battery is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to improvements in clad lead-acid batteries.

Conventional technology and its challenges At present, lead-antimony alloys are mainly used for the core metal of clad lead-acid batteries, but with the recent demand for maintenance-free technology, lead-calcium alloys, etc. Lead alloys that do not significantly reduce the hydrogen overvoltage of the negative electrode plate are being considered. However, a core metal made of such an alloy that does not substantially contain antimony has a large elongation, which causes the problem that the tube comes off from the connecting seat and the active material falls off.

Means for Solving the Problems The present invention solves the above-mentioned problems, and its gist is that the length of the core metal is slightly shorter than that of the conventional one, and a gap is created between the tip of the core metal and the lower connecting seat. The purpose of this is to prevent the lower joint from coming off even if the core metal stretches, and to improve the life performance.

Embodiment FIG. 1 is a schematic longitudinal cross-sectional view of essential parts showing an embodiment of the clad lead-acid battery of the present invention.

In the figure, 1 is a lead alloy that does not substantially contain antimony;
For example, it is a core metal made of a lead-calcium-tin alloy or a lead-antimony-arsenic-tin alloy containing 1% or less of antimony, 2 is its tip, 3 is an acid-resistant and oxidation-resistant porous tube, 4 is a positive electrode active material, 5 is an upper lead alloy joint,
Reference numeral 6 is a lower connecting seat, and a gap is provided between the light end portion 2 of the metal core and the lower connecting seat 6. These 1 to 6 constitute a clad type positive electrode plate. 7 is a lead alloy that does not substantially contain antimony;
For example, the negative electrode plate 8 is a separator using a grid made of a lead-calcium alloy. The positive electrode plate and the negative electrode plate 7 are stacked so as to face each other with the separator 8 interposed therebetween to form an electrode plate group. 9 is a battery case, 10 is a lid, 11 is a valve fixed to a part of the lid, 12 is a positive terminal, and 13 is a negative terminal. The electrolyte was a gel made by adding silicon dioxide to dilute sulfuric acid and was filled to the top of the electrode plate group.

Next, FIG. 2 shows the results of a charge/discharge cycle test of the rat-type lead-acid battery according to the present invention shown in the drawings, in comparison with that of a conventional clad-type lead-acid battery.

All lattice alloys were lead-calcium-tin alloys with the same composition. Further, discharging was performed at a rate of 5 hours to 1.7 V/cell, and charging was performed at a constant voltage of 2.4 V/cell for 10 hours. In the charge/discharge cycle test, the gap between the tip of the core metal and the lower connecting seat was set to O.
battery A, and 1/200 of the core metal length,
Batteries B with 1/100, 1/20 and 1/10
I went to E.

In the conventional product A in which the optical end of the core metal is fixed to the lower connecting seat and in the battery B in which a gap of 1/200 of the core metal length is provided between the tip of the core metal and the lower connecting seat, the lower connecting seat 6 is fixed due to the elongation of the core metal. It came off from the tube 3, and the positive electrode active material 4 inside the tube fell off, causing a short circuit with the negative electrode plate and reaching the end of its life after 1000 to 1250 cycles.
In the clad type battery of the present invention in which a gap of 1/100 to 1/20 was provided, the connecting seat did not come off the tube even if the core metal was stretched; a life performance of 1500 cycles or more was obtained. Note that if the gap between the light end of the core metal and the lower connecting seat is expanded to 1710 mm of the length of the core metal, the capacity will be considerably reduced, so the gap needs to be 1/100 to 1720 mm of the length of the core metal.

Effects of the Invention As described above, the present invention can provide a clad lead-acid battery with good life performance, and therefore has extremely great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of the main parts of an embodiment of the clad lead-acid battery of the present invention, and FIG. 2 is a characteristic diagram comparing the cycle life performance of the lead-acid battery of the present invention and a conventional lead-acid battery. .

Claims (1)

[Claims] 1. In a clad lead-acid battery using a lead alloy core that does not substantially contain antimony, the tip of the core and the lower connecting seat are not fixed, and the length of the core is between the tip of the core and the lower connecting seat. A clad lead-acid battery characterized by having a gap of 1/100 or more and 1/20 or less.