JPS6010563A - Manufacture of lead storage battery plate - Google Patents

Abstract

PURPOSE:To produce mechanically strong, light-weight and high capacity lead storage battery plate, by thermally hardening maintenance-free lead alloy then performing work deformation and expanding. CONSTITUTION:Maintenance-free lead alloy produced through roll casting is thermally hardened then applied with work deformation through cold rolling or under the temperature of 20-120 deg.C. Then this deformed body is expanded to produce a grid to be employed as a battery plate. With such method, mechanical strength is improved while extension of plate is limited resulting in lengthening of service life.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lead-acid battery monthly plate substrate by a machining method.A lead-acid battery plate is manufactured by filling an active material into an individual lattice substrate. The substrate is formed by casting a pb-sb alloy having an sb content of 4 to 7% (hereinafter % represents quality).

Recently, there has been a demand for batteries to be maintenance-free, as well as for batteries to be lighter in weight, higher in capacity, and longer in life.

However, since conventional lead alloys contain a large amount of Sb, there is a problem in extending the service life. Because of the trench casting method, it is difficult to make the grid substrate thinner, making it impossible to reduce the weight and increase the capacity of the battery.

From this, Pb-Ca alloys containing no sb,
A method has been developed and put into practical use in which a maintenance-free lead alloy thin plate such as a pb-Sr alloy is produced and a grid substrate is manufactured by punching or machining such as an expander method.

However, the lead alloy body for maintenance-free use has weak mechanical strength. Therefore, when a grid substrate is manufactured from this lead alloy,
The grating substrate is easily deformed during filling with active material. In addition, while the electrode plate obtained from this substrate is assembled and used as a battery, the active material expands or the lattice ribs corrode, causing the ゛C electrode plate to elongate from yc, resulting in the contact between the lattice substrate and the active material. This causes serious problems such as poor adhesion or short circuits, which shortens battery life.

The present invention has been made to solve this problem, and its purpose is to improve the mechanical strength of lead alloys for maintenance-free use by improving the machining method for lead alloys, and to improve the mechanical strength of lead alloys, making them lightweight. The object of the present invention is to provide a method for manufacturing an electrode plate substrate for a lead-acid battery, which can increase the battery capacity, increase the capacity, and extend the service life.

That is, the present invention is characterized in that a maintenance-free lead alloy body is subjected to heat hardening treatment, then processed and deformed, and then an X-Gund sheet is formed from this processed and deformed body to form a lattice substrate.

The method of the present invention will be explained in detail below. The present invention first deals with a Pb-Ca alloy and a Pb-8r alloy.

Lead alloy bodies are manufactured continuously or discontinuously by casting or machining maintenance-free lead alloys such as pb-low Sb alloys. The size of this lead alloy body is larger than the size of the grid substrate to be finally obtained.

Next, this lead alloy body is subjected to heat hardening treatment.

This treatment hardens particles by precipitating particles from the lead alloy body and adjusting the crystal grains.The heating temperature varies depending on the alloy composition, but in the case of pb-Ca alloys, it is usually 70 to 150 degrees Celsius. . In the case of a pb-low Sb alloy, it is hardened by heating at 200° C. or higher and then rapidly cooling.

Further, the heat-hardened lead alloy body is subjected to processing deformation such as rolling to make it thinner and have a desired thickness. This treatment is to work harden the lead alloy body, and the work deformation temperature is 20 to 120 degrees Celsius to further increase the mechanical strength.
~100C is appropriate.

In this case, it is inappropriate to process and deform the lead alloy body before subjecting it to heat hardening treatment. This is because the structure obtained through processing deformation becomes soft during the heat hardening treatment, and the mechanical strength does not become very high.

Next, an expanded sheet is obtained from the processed and deformed lead alloy body by the Ex-Gund method, a lattice substrate is formed from this sheet, and the lattice substrate is filled with an active material to produce a lead-acid battery electrode plate.

According to this method, the strength is increased by processing deformation in addition to heat curing treatment, so that elongation of the battery electrode plate during assembly and use is suppressed, and the life of the battery can be extended.

Next, examples of the present invention will be described Example I pb-C containing 0.08% Ca and 0.45% Sn
A maintenance-free lead alloy body with a thickness of 2 mm was produced from the molten a-Sn alloy by continuous casting, and after heat hardening at 120°C for 1 hour, it was cold rolled to a thickness of 0.9 mm.
A processed deformed body was obtained. A tensile test was conducted on this sample and a sample obtained by the conventional method at room temperature. As a result, as shown in Table 1 below, it can be seen that the mechanical strength of the processed deformed body according to the present invention is superior to that of the conventional one.

Table 1 Next, an expanded sheet was formed from this processed deformed body to prepare a lattice substrate, and this was used to prepare a nominal solubility of 50Ah/
I made a 20 HR battery. This battery was subjected to a JIS life test for 50 cycles, and the elongation of the electrode plates in the vertical direction was investigated. The results are shown in Table 2 in comparison with conventional results.

It can be seen from the second coating table that the electrode plate obtained by the method of the present invention has little elongation and can have a long life.

Example 2 The maintenance-free lead alloy body (12 cm thick) of Example 1 was heated and hardened at 120° C. for 1 hour, and then cold rolled to obtain a processed deformed body of 1 inch.

As a result of examining the change in tensile strength (σ., 2) in each process, the lead alloy body before heat hardening is 2 kgf/τ2°, the lead alloy body after heat hardening is 3 kgf/mm, and after cold rolling. The deformed body was 4.5 kgf/ran.

For comparison, the above lead alloy body was cold-rolled to 1 m
A processed deformed body was obtained, and this was heat-hardened at 120° C. for 1 hour. As a result of investigating the change in tensile strength (σ., 2) in each process, the processed deformed body after cold rolling was 3k17f
/rrs2. 3.5 kFlf/cc after heat curing treatment
It was low.

From this result, it is necessary to process deformation after heat hardening treatment.
It was found that it was not appropriate to manufacture the product using the reverse process.

Example 3 A maintenance-free crude lead alloy body with a thickness of 1.6 points was manufactured by continuous casting from a molten Pb gold alloy containing 0.08% Ca and 0.6% Sn, and this was heated at 120°C for 60°C. After heat-hardening for a minute, it was rolled at a birch temperature to obtain a processed deformed body with a thickness of about 0.85+++ m. Its tensile strength [4B] is shown in curve A of the drawing. For comparison, the tensile strength of the conventional method (obtained by the continuous casting method and directly rolled at a temperature T (C)) was also investigated and is shown in curve B in FIG. The vertical axis in the figure is the yield strength σ of the material obtained by tensile testing at room temperature. , 2(T) and σ. , 2(20), σ. , 2 (Tel indicates the yield strength of the sample rolled at the rolling temperature T (C),
σ. , 2 (20) is the trench plate thickness 1 obtained by continuous casting method.
．． This is the yield strength in a 6-way room temperature tensile test.

As can be seen from the figure, the strength of the present invention is higher than that of the conventional method, preferably at 20 to 120°C, particularly preferably at 40 to 140°C.
It can be seen that it is better to process the kekata at ℃.

Next, an expanded substrate was prepared from the processed deformed body obtained by this method and the conventional method (a strip with a thickness of about 1.1 mm rolled at a processing temperature of 100°C), and this was used to produce an expanded substrate with a nominal capacity. A battery of ta 50 Ah/20 HR was produced. These batteries were subjected to 80 cycles of JIS life test.
The percent elongation of the electrode plate in the vertical direction was examined. The results are shown in Table 3.

Table 3 As explained above, according to the present invention, the mechanical strength of the substrate is increased by processing and deforming after the thermosetting treatment, and therefore, the active material is filled into this substrate to manufacture battery plates. During battery operation and when using batteries, the damage to the electrode plate can be kept to a minimum.
It has a remarkable effect of increasing the lifespan.

[Brief explanation of drawings]

The drawing is a diagram showing the yield strength ratio according to the rolling degree of the substrate according to the present invention in comparison with that of the conventional substrate.

Claims (2)

[Claims] (1) A lead-acid battery electrode plate substrate characterized in that a maintenance-free lead alloy body is heat-hardened and then processed and deformed, and then an X-Gund sheet is formed from this processed and deformed body to form a lattice substrate. Production method. (2) Claim 1, Item 1/., characterized in that the processing deformation temperature is 20 to 120°C. A method for manufacturing an electrode plate substrate for a lead-acid battery.