KR20030096931A - Grid for lead-acid storage batteries - Google Patents

Abstract

PURPOSE: Provided is an electrode plate for a lead storage battery, which has successive holes in an upper frame bar of the electrode plate, therefore it can reduce an upward movement of the upper frame, caused by the growth of a cathode plate, remarkably, absorb self-deformation, and delay the growth of the electrode plate. CONSTITUTION: The electrode plate(10) of the lead storage battery comprises: a lug(11) produced by an expanded grid method; the upper frame bar(12); a lower frame bar(13); a grid mesh(14) connecting the upper frame bar(12) to the lower frame bar(13) in the form of diamonds to have and support an active material; the successive holes(15) formed in the upper frame bar(12), wherein the shape of the hole(15) can be a circle, a square, or a pentagon, desirably a triangle.

Description

Lead plate for lead acid battery {Grid for lead-acid storage batteries}

The present invention relates to an electrode plate for lead acid batteries. More specifically, the present invention relates to a lead acid battery pole plate formed by forming a series of holes having a specific shape in order to increase the structural rigidity of the upper frame bar of the pole plate manufactured by the expanded grid method.

In the manufacture of electrode plates for supporting active materials and collecting electricity in lead-acid batteries, an expanded grid method has been widely used in recent years.

That is, according to Korean Laid-Open Patent Publication No. 1998-016402, a thin alloy lead leaked from a lead furnace is separated by a slitter and wound like a coil on a winder to form a coil strip to form a coil strip. By the thickness of the remaining portion except for the central portion in the longitudinal direction of the coiled strip becomes thinner and the width becomes wider to form a mesh of the mesh (mesh), the center of the overall mesh shape to maintain the coiled strip shape as it is Expanding process to be a substrate, Tab blanking process in which the cleft strip left in the center part is cut to have tabs at regular intervals through a tab blanker in which the mesh-type substrate is rotated, Mesh-type cut with a tab at the center part An active material application process that causes the substrate to pass through the sprayer to become a coated pole plate. Necessary to the aging process, the chemical reaction of the battery to reduce the moisture and Pb% of the process, the seal plate for cutting the coating of the electrode plate 1 unit PbO ₂ , It introduces the process of manufacturing expanded grid for storage batteries through the conversion process to Pb and the secondary cutting process, and says that productivity can be dramatically improved by connecting a series of electrode plate manufacturing processes continuously.

However, when the electrode plate is manufactured by the expanded grid method, protrusions are formed at an edge of the upper frame bar or the lower frame bar when the cutting position is missed in the cutting process. This protrusion causes the separator to break and causes a short circuit. In order to solve this problem, Japanese Patent Laid-Open No. 9-63591 cuts the electrode plate using a flat cutting table to prevent breakage of the separator.

In addition, when manufacturing the electrode plate by the expanded grid method, as mentioned earlier, the productivity is very high, but because of the net-shaped lattice structure has a disadvantage that the mechanical strength is relatively small and easy to deform. To solve this problem, Japanese Patent Application Laid-Open No. 10-149835 introduces a technique of spraying and rolling molten or powdered lead alloy on the surface of a lead alloy slab.

However, as described above, even if a flat cutting board is used to prevent short-circuit of the electrode plate or additionally sprayed lead alloy is added to increase mechanical strength, the electrode plate manufactured by the expanded grid method repeatedly charges and discharges. As a result, the volume change of the positive electrode active material and the growth of the positive electrode plate due to the corrosion reaction of the electrode plate could not be fundamentally prevented.

That is, the active material of the lead acid battery increases in volume when it changes from a charged state to a discharged state, and thus the electrode plate expands as charging and discharging are repeated. In other words, the electrode plate grown with the expansion of the active material during the discharge reaction is impossible to shrink back to its original shape even during the charging reaction, so that the plate plate is continuously grown. In particular, since the volume change of the positive electrode active material is greater than that of the negative electrode, the positive electrode plate growth occurs in association with the substrate corrosion reaction.

The electrode plate manufactured by the expanded grid method is shown in FIG. 2. According to FIG. 2, the pole plate 20 (with the active material removed to see the grid structure) has a lug 21, an upper frame bar 22, a lower frame bar 23 and a diamond shape therebetween. It is composed of a grid mesh 24 for accommodating and retaining the active material connected to the wire, but since the edges of both sides there is no frame is much worse than the conventional cast substrate. That is, when the positive electrode plate manufactured by the expanded grid method grows, as shown in FIG. 3, the upper frame bar 22 moves upward to contact the negative electrode plate having the separator (indicated by the dotted line) between them to cause a short circuit. The risk is high.

That is, the width of the upper frame bar 22 should be appropriately designed to have sufficient rigidity so that the upward movement of the upper frame due to the pole plate growth is suppressed to less than or equal to the separator margin h until the end of the life of the battery. However, there are limitations in taking the upper frame width dimension too large in terms of battery weight and cost reduction.

It is an object of the present invention to provide a lead plate for a lead acid battery formed by forming a series of holes having an arbitrary shape in order to increase the structural rigidity of the upper frame bar of the pole plate manufactured by the expanded grid method.

1 is a plan view after the tab blanking process of the lead plate for a lead-acid battery manufactured by the expanded grid method according to the present invention.

2 is a plan view after a tab blanking step of a lead plate for a lead acid battery manufactured by a conventional general expanded grid method.

Figure 3 is a plan view of the electrode plate showing a modified form due to the growth of the electrode plate.

-Explanation of symbols for the main parts of the drawing

10,20 ---- electrode plate 11.21 ---- lug

12,22 ---- upper frame bar

13,23 ---- lower frame bar

14,24 ---- grid mesh 15 ---- hole

The present invention relates to a lead plate for a lead-acid battery comprising a grid mesh for accommodating and supporting a lug manufactured by an expanded grid method, an upper frame bar, a lower frame bar, and an active material connected in a diamond form therebetween. And a series of holes having an arbitrary shape are formed in the upper frame bar.

The expanded grid method, one of the lead-acid battery plate manufacturing methods, as mentioned above, is a series of pole plate manufacturing processes that lead to a strip casting process, an expanding process, a tab blanking process, an active material application, and a pole plate cutting process. Is done. This results in a continuous expanded substrate, followed by a blanking process that leaves the lug after subsequent active material application and cutting.

According to the present invention, a hole having an arbitrary shape is formed in the upper frame bar during the tab blocking process during the expanded grid manufacturing process.

That is, as shown in Figure 1, the lead plate for lead-acid battery according to the present invention (10: the active material is removed to see the grid structure) is a lug 11, the upper frame bar 12, the lower frame bar (13) and a grid mesh 14 for receiving and retaining the bow material connecting therebetween in the form of a diamond, and at the same time a series of holes 15 of arbitrary shape on the upper frame bar 12. ) Is formed.

The shape of the hole 15 is most preferably a triangle as shown in Fig. 1 in terms of stability and rigidity, but may have any shape such as a circle, a rectangle, or a pentagon.

As shown in FIG. 1, when a series of holes 15 are formed in the upper frame bar 12 of the electrode plate 10, the structural rigidity of the upper frame bar 12 is increased, so that the electrode plate has no holes even with the same amount of lead. In comparison, the upward movement of the upper frame bar 12 due to the growth of the positive electrode plate as shown in FIG. 3 may be significantly reduced. In addition, when the top plate 10 grows, the upper frame bar 12 absorbs deformation by itself, thereby delaying the growth of the top plate above the separator, and contributing to material cost reduction.

As mentioned earlier, when a series of holes are formed in the upper frame bar of the pole plate, the structural rigidity of the upper frame bar increases, resulting in the upward movement of the upper frame bar due to the growth of the anode plate compared to the pole plate without holes even with the same lead amount The movement phenomenon can be greatly reduced.

In addition, the upper frame bar itself absorbs the deformation during the growth of the plate, thereby delaying the growth of the plate above the separator and contributing to the reduction of material costs.

Claims (1)

A lead plate for a lead acid battery comprising a lug manufactured by an expanded grid method, an upper frame bar, a lower frame bar, and a grid mesh for accommodating and supporting an active material connected therebetween in a diamond form. A lead plate for a lead acid battery, characterized in that a series of holes having an arbitrary shape are formed in a frame bar.