JP2007123204A - Grid base for lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve current collecting property of a grid base for a lead-acid storage battery. <P>SOLUTION: On the grid base for the lead-acid storage battery formed into a square shape surrounded by surrounding skeleton, having an ear part protruded from the surrounding skeleton, having lateral and vertical intermediate skeletons perpendicularly crossing each other formed between surrounding skeletons facing each other; supplemental intermediate skeletons extending inward from the surrounding skeleton on which the ear part is protruded, not reaching the surrounding skeleton of opposite side, are formed between the intermediate skeletons. The intermediate skeletons positioned near to the protruded ear part and the supplemental intermediate skeletons are formed so as to become thicker as it is headed to the surrounding skeleton having the ear part, and the surrounding skeleton having the ear part is formed so as to become thicker as it is headed to the ear part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a grid substrate for a lead storage battery.

The lead storage battery is filled with a paste-form active material kneaded by mixing lead powder, dilute sulfuric acid, water, etc. into a lattice substrate, and aged and dried positive and negative electrode plates are used, with these facing each other through a separator, It is used by injecting an electrolytic solution made of dilute sulfuric acid and taking out the electromotive force from the terminal. This lead storage battery grid substrate is made by casting or machining a lead alloy with a square frame and a frame. Ears formed on the outer surface of the bone, and a lattice shape formed by intersecting a number of vertical and horizontal vertebrae that cross between the surrounding bones inside the surrounding frame bone. A lattice substrate is used.

In these lattice substrates, the frame bones are relatively thick and uniform, and the vertical and horizontal medial bones are relatively thin and uniform (Patent Document 1).

For this reason, particularly when used in a high rate discharge, an increase in the current density of the lattice in the region near the ear where the current concentrates increases the voltage drop. That is, there is a problem that the discharge voltage of the storage battery decreases. In addition, there has been a problem that the above tendency becomes more remarkable due to the corrosion of the lattice substrate due to the use of the storage battery and the reduction of the cross-sectional area from the time of manufacture.

As a proposal for improving such a phenomenon, there is a proposal in which current collecting performance is improved by additionally providing a central bone that extends radially from the vicinity of the ear portion on these lattice-shaped substrates (Patent Document 2).
Japanese Patent No. 2805910 Japanese Utility Model Publication No. 52-48631

  However, the method described in Patent Document 2 is still insufficient and further improvement is desired. Furthermore, as a countermeasure against corrosion of the lattice substrate and an increase in current density due to a decrease in the cross-sectional area of the middle bone, a method of thickening the entire middle bone is conceivable. However, when the whole is thickened, problems such as excessive weight increase occur.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lead-acid battery grid substrate that has improved current collecting performance not only in the initial stage of production but also at the end of its life without significantly increasing the weight of the grid board.

  In order to solve the above-mentioned problems and achieve the object, the present invention forms an auxiliary middle bone that extends from the surrounding bone in which the ear is formed, for example, but does not reach the surrounding bone facing the longitudinal middle bone. With

The invention of claim 1 is comprised of a surrounding frame bone that surrounds the four circumferences, and a longitudinal middle bone and a transverse middle bone that intersect with each other between the surrounding frame bones and intersect with each other, and an ear that protrudes from the surrounding frame bone. In the formed lead-acid battery lattice substrate, the auxiliary bone is formed so as to extend inward from the frame bone in which the ear is formed, not to be interposed between the frame bones, and to be positioned between the middle bones. The middle bone extending from the frame bone in which the middle bone and the ear are formed gradually increases in thickness in the vicinity of the ear as it approaches the frame bone, and the thickness of the frame bone in which the ear is formed is As it approaches, the thickness increases gradually.

According to a second aspect of the present invention, the middle bone extending from the surrounding bone in which the auxiliary middle bone and the ear are formed is formed in such a manner that the thickness is gradually increased in the vicinity of the ear as the ear is approached.

According to the configuration of claim 1, in the vicinity of the ear of the lattice substrate where current is concentrated, the auxiliary central bone prevents the current from being concentrated on one central bone, and the surrounding frame in which the auxiliary central bone and the ear are formed. The medial bone that spans between the surrounding bones facing away from the bones is gradually made thinner as it moves away from the surrounding bones where the ears are formed, and further thickened as the surrounding bones with the ears approach the ears. As a result, an extreme increase in current density is prevented, and as a result, the electrical resistance can be greatly reduced and the current collecting performance is improved. It should be noted that the current collection characteristics cannot be sufficiently improved only by making the middle bone thick without forming the auxiliary middle bone.

According to the configuration of the second aspect, since the thickness of the auxiliary middle bone and the middle bone is reduced as the distance from the immediate vicinity of the ear is increased, an increase in current density is suppressed and the weight can be reduced.

Furthermore, even if the grid substrate corrodes due to the use of a storage battery and the cross-sectional area of the middle bone and auxiliary middle bone decreases, it gradually increases in thickness, so it is not cut in the middle of the middle bone and collected over a long period of time. It is possible to suppress degradation of electric performance

  According to the present invention, the electrical resistance in the vicinity of the ear can be reduced, and the current collecting performance is improved. It plays.

The best mode of the embodiment will be described below.
As shown in FIG. 1, a lattice substrate 1 was obtained by casting a lead alloy, for example, a Pb—Ca alloy. The lattice substrate 1 has a square shape surrounded by a relatively thick frame frame 2 on the four sides, and a plurality of frame bones 3 that are opposed to each other in the vertical and horizontal directions inside the frame frame 2. The intermediate bones 3 in the vertical and horizontal directions are formed in a lattice pattern orthogonal to each other.

  The upper frame bone 21 of the frame bone 2 protrudes to form an ear 4, and among the longitudinal central bones, particularly, a plurality of longitudinal central bones formed in the vicinity of the ear are the ear 4. As the upper frame frame 21 is formed, the thickness is gradually increased.

  Further, between the adjacent middle bones of a plurality of longitudinal middle bones in the vicinity of the ear, the auxiliary middle bone 5 extending from the upper frame bone 21 in which the ear 3 is formed does not reach the opposite frame bone. It was formed halfway, and the thickness of the auxiliary middle bone 5 was gradually increased as it reached the upper frame bone 21 where the ears 4 were formed.

Furthermore, the upper frame bone 21 in which the ear is formed is gradually thickened as it approaches the ear 3. In the figure, reference numeral 6 denotes a foot of the substrate 1.

  As shown in FIG. 1, the position slightly shifted from the middle in the length direction of the upper frame bone 21 of the square lattice substrate 1 surrounded by the frame frame 2 obtained by casting the Pb—Ca alloy. And forming a plurality of central bones 3 and a plurality of lateral central bones 3 perpendicular to each other in a vertical space in a rectangular space in the surrounding bone. Five auxiliary middle bones 5 extending from the upper frame bone 21 were formed between the middle bones adjacent to each other in the longitudinal direction. The auxiliary intermediate bone 5 has a length up to the middle without reaching the opposing frame bone.

Then, the four longitudinal central bones 31, 32, 33, 34 and the four auxiliary central bones 51, 52, 53, 54 located in the vicinity of the ears reach the upper frame bone 21 in which the ears 4 are formed. In accordance with the above, the width of the middle bone was gradually increased to make it thicker.

At this time, it is preferable that the boundaries of the thickened portions of the inner bones 31, 32, 33, and 34 are curved or V-shaped as indicated by dotted lines. Further, it is preferable to make the boundary of each stage and the auxiliary middle bone whose thickness are changed in stages gradually.

  Furthermore, the upper frame bone 21 was also made thicker by increasing the width step by step as it reached the protruding ear.

  In the first embodiment, in the middle bone and the auxiliary middle bone, which are located in the vicinity of the ear and gradually increase in thickness according to the upper frame bone in which the ear is formed, these middle bones located immediately below the ear Alternatively, the same lattice substrate as that of Example 1 was manufactured by casting except that the thickness of the formed intermediate bone or the auxiliary intermediate bone was gradually reduced as the distance from the position immediately below the auxiliary intermediate bone was increased.

(Comparative example)
In Example 1, a lattice substrate was produced by casting in the same manner as in Example 1 except that the middle bone near the ear and the auxiliary middle bone were not thickened.

(Conventional example)
As shown in FIG. 2, a lead-acid battery lattice substrate in which a central bone 7 extending radially from the vicinity of the ear 4 is added to a lattice substrate 1 in which longitudinal and transverse central bones 3 are formed in a relatively thick frame bone 2 by casting. Obtained.
The thicknesses of the longitudinal and transverse inner bones 3, the radial inner bones 7, and the surrounding frame bone 2 are substantially uniform.

  Using the lattice substrates of these examples, comparative examples and conventional examples, this was filled with a paste-like active material, aged and dried to produce a positive electrode plate, and a negative electrode plate manufactured by a known method via a separator So-called liquid lead-acid batteries, each of which is laminated and has a large amount of electrolytic solution with a capacity of 55 AH at 12 V, are each discharged and discharged in an atmosphere of −18 ° C. as defined in JIS D5301. ) Was measured. This is one of the high rate discharge tests, and the CCA is largely affected by the discharge voltage of the storage battery, which leads to the evaluation of the discharge voltage of the storage battery, that is, the current collection performance of the grid.

Furthermore, in accordance with the light load life test defined in JIS 5301, after charging and discharging 3000 times at an ambient temperature of 75 ° C., fully charging, and then measuring CCA again, the current collection performance of the grid before and after using the storage battery Evaluated. The results are shown in Table 1.

  As is clear from Table 1, the lead-acid batteries using the grid substrates of Examples 1 and 2 have a large CCA before the life test, and even after the life test, as compared with the case where the comparative example and the conventional example grid substrate are used. There is little decrease in CCA. Therefore, the current collection characteristics are improved.

  Furthermore, in Example 2, since the middle bone and the auxiliary middle bone are made thinner as the distance from the position immediately below the ear, the weight can be reduced correspondingly, and the same effect can be achieved.

Example of the present invention lattice substrate Conventional lattice substrate

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lattice substrate 2 Frame bone 21 Upper frame bone 3 in which the ear 4 was formed Middle bone 4 Ear 5 Auxiliary middle bone

Claims (2)

A grid for lead-acid batteries, which is composed of a frame bone that surrounds the four circumferences, and a vertical and horizontal central bone that spans between the frame bones and intersects the frame bone in its interior, and has ears protruding from the frame bone In the substrate,
From the frame bone in which the ear is formed, it goes to the inside, does not pass between the frame bones, and is located between the middle bones to form auxiliary bones,
The intermediate bone extending from the auxiliary bone and the surrounding bone in which the ear is formed has a thickness that gradually increases in the vicinity of the ear as it approaches the surrounding bone in which the ear is formed,
A lead substrate for a lead-acid battery, characterized in that the thickness of the frame bone on which the ears are formed is gradually increased toward the ear. 2. The lead substrate for a lead-acid battery according to claim 1, wherein the auxiliary central bone and the central bone extending from the surrounding bone in which the ear is formed are formed in the vicinity of the ear and gradually increase in thickness as it approaches the ear. .