JP3042313B2 - Plate for lead-acid battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous metal body used as a support for an electrode plate for a lead storage battery, and more particularly to a support for holding the active material.

[0002]

2. Description of the Related Art In general, an electrode plate of a lead-acid battery comprises an active material mainly composed of lead or lead oxide and a support for holding the active material and also serving as a current collector.

[0003] As the support, a lattice body manufactured by casting or expanding, or a punching metal having an opening in the surface of a flat plate is used.

[0004]

However, in the above-mentioned grid body, the inside and the surface of each grid are filled with an active material, and the active material at the center of the grid has a long distance from the grid bone, so that the current is collected. The properties were not good. When the battery is charged and discharged, the active material falls off the grid because the lead active material expands and contracts. In particular, the active material in the center of the grid has a small supporting force by the grid. It was easily dropped off.

In a punched metal support having a large number of small holes formed in a flat plate, the active material layer coated on the front and back of the flat plate is poorly held, and the active material is easily dropped off from the surface of the support. .

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electrode plate for a lead storage battery using an active material support having a structure excellent in current collection efficiency and active material holding power.

[0007]

In order to solve the above-mentioned problems, an electrode plate for a lead-acid battery according to the present invention comprises a porous metal body made of lead or a lead alloy having a corrugated cross section, and one or both surfaces of the porous metal body. And an active material layer containing lead or lead oxide as a main component, and the metal porous body has a surface where the apex exists at each apex of a crest and a valley of a wave of a metal plate having a cross-sectional waveform. It has a pierced portion that is pierced from the opposite surface to the apex, and burrs protruding toward the surface of the porous body are formed around the pierced portion.

[0008]

In this structure, a porous metal body having a corrugated cross section is used as the support for holding the active material, and the active material is held in the concave portion formed by the wave peaks and valleys. The active material can be prevented from falling off. Further, a perforation is formed at the peaks of the peaks and valleys of the wave, and there are burrs protruding outward around the perforations. For this reason, the active material can be prevented from peeling off from the surface of the support due to burrs.

Further, the active material on the front and back of the support can be connected by the perforated portion at each apex portion, so that the active material and the holding capacity of the support can be improved.

On the other hand, since the cross section of the support is corrugated, the distance between the active material and the support becomes shorter than before, and the current collection efficiency can be improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a lead-tin alloy porous body used as an active material support in the lead storage battery electrode plate of the present invention.

In FIG. 1, reference numeral 1 denotes a porous body made of a lead-tin alloy having a corrugated cross section, reference numeral 2 denotes a ridge of the porous body 1, reference numeral 3 denotes a valley of the porous body 1, and reference numeral 4 denotes a top and a valley of the ridge. Perforated portions 5 provided at the bottom are burrs provided around the perforated portion and protruding toward the surface of the porous body.

FIG. 2 is a sectional view showing an example of the configuration of a mold used for drilling a lead-tin alloy plate. Reference numeral 6 denotes a lower die having a notch 8 on the upper surface of the trapezoidal portion 7 and a concave portion 9 provided on both sides of the trapezoidal portion 7. It is an upper mold having a portion.

When a lead-tin alloy plate 11 is arranged between the upper die 10 and the lower die 6 and the upper die 10 and the lower die 7 are pressed so as to be relatively close to each other, the alloy plate 11 is moved upward. The notches of the mold and the lower mold are pressed into the recesses corresponding to the respective notches. Thus, the alloy plate 11 is stretched and opened to obtain a rectangular perforated portion 4.

Further, the alloy plate 11 is processed into a cross-sectional waveform by the trapezoidal portions 7 of the upper die and the lower die, thereby forming peaks 2 and valleys 3 having a trapezoidal cross section as shown in FIG.

Here, the thickness of the lead-tin alloy plate is 0.05 m
m, the interval between the peaks and the valleys or the valleys of the corrugated porous body is 2.2 mm, the interval between the perforations arranged in a line at the peaks or the valleys is 0.8 mm, and the top of the peaks The distance between the valley and the bottom is 1.0 mm, and the size of the rectangular hole is 0.3 mm.
mm × 0.4 mm, and the apparent thickness of the corrugated porous body including burrs was 1.6 mm.

Then, as shown in FIG. 3, a predetermined amount of an active material paste 12 mainly composed of lead powder, sulfuric acid and water is applied to both sides of the porous body, and this is aged, dried, cut and cut into a length of 115 mm.
A 132 mm wide electrode plate was prepared.

This was designated as an electrode plate A of the present invention. On the other hand, an electrode plate similar to that of the present invention was produced except that a cast lattice body made of a lead-tin alloy was used as an active material support, and this was used as an electrode plate B for comparison.

An electrode plate similar to that of the present invention was prepared except that a porous body of punched metal was used as an active material support, and this was used as a comparison electrode plate C.

FIG. 4 shows the variation in the amount of paste applied when 100 pieces of each electrode plate were manufactured. Here, the amount of paste applied was 100 g.

As can be seen from the figure, the comparative electrode plates B and C showed large variations in the amount of paste applied.

However, in the electrode plate A of the present invention, since the cross section of the porous body is corrugated, the paste can be held in the concave portion formed by the peaks and valleys without falling off, and the peaks and valleys can be held. Since the burrs protruded toward the surface of the porous body in the portion, the peeling of the paste applied to the surface of the porous body could be prevented, and the variation in the amount of the applied paste became small.

Next, lead-acid batteries having a nominal specification of 12V48Ah were manufactured using the plates A, B, and C, and the batteries were referred to as a battery A of the present invention and comparative batteries B and C, respectively.

Using these batteries, at 25 ° C., 10
Discharge was performed at each current value of 0 A, 200 A, and 300 A, and the battery voltage was measured 30 seconds after the start of discharge.

FIG. 5 shows the result. As shown in FIG. 5, in the battery A of the present invention, since the cross section of the porous body is corrugated, comparative batteries B and C using a flat active material support were used.
As a result, the distance between the active material and the support was shortened, and the current collection efficiency was improved. As a result, the discharge characteristics of the battery could be improved.

Further, using the batteries A, B and C, the current 45
A charge / discharge cycle test was conducted in which the battery was discharged to a depth of discharge of 100% at A and charged to a depth of charge of 120% at a current of 5A.

FIG. 6 shows the result. As shown in FIG. 6, in Comparative Batteries B and C, the active material dropped off from the active material support made of a cast lattice or punched metal, and the charge / discharge cycle life of the batteries was shortened. However, in the battery of the present invention, since the cross section of the active material support is corrugated, the active material can be held in the crests and valleys without falling off, and the active material can be prevented from peeling off by burrs. As a result, the charge / discharge cycle life of the battery could be improved.

In this embodiment, as shown in FIG. 3, a corrugated porous body having a cross-sectional shape in which trapezoidal peaks and valleys are connected via a flat portion is used. 7A, a semi-arc-shaped peak and a valley are formed continuously as shown in FIG. 7A, and a semi-arc-shaped peak and a valley are connected via a flat portion as shown in FIG. 7B. However, the same effect can be obtained even if the trapezoidal peaks and valleys are formed continuously as shown in FIG.

In this embodiment, the perforated portion is rectangular as shown in FIG. 8A, and burrs are provided on its sides. In addition, as shown in FIGS. Is a semicircle, ellipse,
The burrs may be provided on the opposite side or all sides of the perforated portion with a triangle, a square, or the like.

Further, in this embodiment, as shown in FIG. 1, a porous body in which perforations provided in the peaks and perforations provided in the valleys are alternately used, but as shown in FIG. The perforations of the valleys and the valleys may be provided at adjacent positions. Further, the same effect can be obtained even if the arrangement of the perforated portions and the positions of the burrs are other than those in this embodiment.

Further, as the material of the porous metal body, other alloys such as a lead-calcium alloy may be used in addition to the lead-tin alloy.

[0033]

As described above, in the lead plate for a lead-acid battery according to the present invention, the peaks and valleys of the waves of the metal plate having a corrugated cross section are formed at the vertices of the corrugated metal plate from the surface opposite to the surface where the vertices exist. A metal porous body having a perforated portion perforated toward the apex is used, and burrs are formed around the perforated portion. Therefore,
The active material can be held in the concave portion formed by the peaks and valleys of the corrugated porous body without falling off, and the active material applied to the surface of the porous body can be prevented from peeling by the burr. Therefore, the discharge characteristics and the charge / discharge cycle life characteristics of the battery can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a porous body used for a lead storage battery electrode plate of the present invention.

FIG. 2 is a cross-sectional view showing a configuration example of a mold used for providing a perforated portion of a porous metal body.

FIG. 3 is a cross-sectional view of the porous body of the present invention.

FIG. 4 is a diagram showing the variation in the amount of active material paste applied to an electrode plate compared with the present invention.

FIG. 5 is a diagram showing discharge characteristics of a battery in comparison with the present invention.

FIG. 6 is a graph showing charge / discharge cycle life characteristics of a battery in comparison with the present invention.

FIG. 7 is a view showing another example of a porous metal body used for the electrode plate of the present invention.

FIG. 8 is a view showing a shape of a perforated portion of the porous metal body of the present invention.

FIG. 9 is a view showing another example of the porous metal body of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Porous body of corrugated cross section 2 Porous body crest 3 Porous body valley 4 Perforated part 5 Burr 6 Lower die 7 Trapezoid part 8 Notch part 9 Depression 10 Upper die 11 Lead-tin alloy plate 12 Active material paste

Continuation of the front page (72) Inventor Nobuyuki Yanagihara 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-58-100362 (JP, A) (58) Fields studied .Cl. ⁷ , DB name) H01M 4/70-4/80

Claims (4)

(57) [Claims] 1. A metal porous body comprising a lead or lead alloy having a corrugated cross section and an active material layer containing lead or lead oxide as a main component formed on one or both surfaces of the metal porous body. Has a perforated portion that is perforated from the surface opposite to the surface where the vertex exists toward the vertex at each peak portion of the wave peaks and valleys of the cross-section corrugated metal plate, and around the perforated portion Is a lead-acid battery electrode plate on which burrs protruding toward the surface of the porous body are formed. 2. The lead plate for a lead-acid battery according to claim 1, wherein perforations are provided alternately or adjacently in a row in adjacent peaks and valleys. 3. The electrode plate according to claim 1, wherein the peaks and the valleys are trapezoidal or semicircular. 4. The shape of the perforated portion is rectangular, elliptical, triangular,
The electrode plate for a lead storage battery according to claim 1, wherein the electrode plate is one of a trapezoid.