JPS59224053A - Lead storage battery - Google Patents

Abstract

PURPOSE:To prevent any separation f an active material so as to obtain a lead storage battery with a long life by providing at least one surface of a separator interposed between electrodes with plural vertical ribs arranged at a pitch not more than 1/2 of the length of the major axis of polygonal cells. CONSTITUTION:An expanded metallic grid 1 used in making an electrode for a pasted lead storage battery consists of a belt-like nonexpanded area 7 having a current-collecting lug 2 and a meshy expanded area 7 having thin rhombic polygonal cells 6 each surrounded by bones 4 and knots 5 connecting the bones 4. An active material paste is applied, for example, from the expanded area 7 to a position which is located in the nonexpanded area 3 and indicated by the broken line. One surface of a separator 9 which is interposed between electrodes, is provided with vertical ribs 8 arranged at a pitch (d) not more than 1/2 of the length (l) of the major axis of the cell 6. Owing to the above constitution, any sepaation of an active material from the grid 1 is effectively prevented, thereby enabling a lead storage battery with a long life to be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a paste-type lead-acid battery using a so-called expanded metal lattice in which lead or lead alloy sheets are expanded into a mesh.

Conventional Structure and Problems Conventionally, cast products have been used for the electrode grids of lead-acid batteries, but recently attempts have been made to use expanded metal grids. This grid is made by making many cuts in a sheet of lead or lead alloy, and opening the door in a mesh pattern.The grid can be processed from a strip-shaped original sheet to the grid and filled with paste in a continuous manner, increasing productivity. It has excellent advantages.

In addition, it is easy to make the grid thinner and lighter, so it is smaller and lighter.
It is expected that it will be possible to construct high-output batteries.

However, the mesh 1]-like expanded portion that holds the paste is relatively simple, having four polygonal cells stacked by bones that connect the bones that make up the mesh. It had the disadvantage of poor holding power.

In particular, the surface of bone is smooth and does not have rough surfaces like cast products, so the ability to hold the active material is weak, and the active material easily falls off, reducing the lifespan. Disadvantages - Purpose of the Invention The object of the present invention is to eliminate such conventional drawbacks and provide a lead-acid battery that can fully utilize the characteristics of using an expanded metal grid.

Structure of the Invention In other words, the present invention provides a group of electrode plates consisting of a paste type electrode using an expanded metal grid and a separator interposed between the electrodes, in which a plurality of longitudinal ribs are provided on at least one surface of the separator. Further, the pitch of the ribs is set to be equal to or less than the length A of the long axis of the flat polygonal cells of the lattice.

According to such a configuration, the surface of the active material paste held in the polygonal cells of the lattice is pressed by one or more ribs provided on the separator, which effectively prevents the active material from falling off. can be prevented.

Description of examples The present invention will be explained below with reference to Examples.

In FIG. 1, 1 indicates an expanded metal grid.

This lattice has a mesh-like structure having a band-shaped non-deployable part 3 having current collecting ears 2, and flat diamond-shaped polygonal cells 6 which are quadrupleted by bones 4 constituting the mesh and n5 connecting the bones 4. It is composed of a developing section 7 and a developing section 7. The active material paste is applied from the developed portion 7 to the non-deployed portion 3, for example, at a position 1 indicated by a chain line.

The nodes that make up the cells 6 are naturally thicker than the non-deployable portion 3 due to the bending, and the cells 6 that overlap the bone 4 connected to the nodes quadruplely extend the non-deployable portion 3. It has a slight angle with respect to the containing plane, so that adjacent cells communicate with each other, and the active material paste filled in each cell is continuous with each other. However, this continuous part is small compared to the case of a cast lattice, and since the bone 4 part is developed by making cuts in the sheet, it has a smooth surface, and the shape of the cell itself Since it is also simple, its binding force with the active material is weak and its retention ability is poor.

Therefore, in the present invention, at least
'□j A vertical rib 8 is provided on one surface at a pitch d equal to or less than μ of the length 4 of the long axis of the cell 6.
are interposed between the electrodes to form an electrode plate group.

According to such a configuration, in the electrode facing the rib 8 of the separator 9, at least one rib 8 is arranged on the short axis of the cell 6 or very close to it, so that the active material in the cell is prevented from falling off by the pressing force of the ribs. Further, even in the side of the electrode that does not face the rib 8, the back surface of the rib comes into close contact with the surface due to group pressure, so that the active material is effectively prevented from falling off.

In the example shown in the figure, the length of the major axis of cell 6 is 22.5 mm,
The pitch d of the ribs was set to 10 mm.

The separator is a polyethylene membrane with micropores,
It is preferable to use one with appropriate elasticity and flexibility.

In addition, as shown in the figure, the expanded metal lattice does not have frame ribs on the sides like a cast lattice, so the separator is formed into a bag by folding the ribbed surface inward and welding the joints on both sides. It is advantageous to insert one electrode, for example, a positive electrode, inside the grid because it is possible to prevent the active material from falling off from cells that do not have a perfect polygonal shape on the side of the lattice, and to prevent short circuits due to falling objects.

In the above example, ribs were provided only on one side of the separator, but ribs may be provided on both sides.

Effects of the Invention As described above, according to the present invention, it is possible to prevent the active material from falling off from a paste-type electrode using an expanded metal grid, and to obtain a long-life lead-acid battery.

[Brief explanation of the drawing]

FIG. 1 is a front view of an electrode grid in an embodiment of the present invention, and FIG. 2 is a plan view of a separator. 1... Lattice, 3... Non-deployed part, 6...
...Cell, 7...Development section, 8...
Rib, 9...Separator.

Claims (1)

[Claims] The paste is applied to a lattice having a band-like non-deployed part having current collecting ears and a mesh-like developed part having a large number of flat polygonal cells surrounded by bones forming the mesh and nodes connecting the bones. A lead-acid battery comprising filled electrodes, wherein at least one surface of a separator interposed between the electrodes is provided with a plurality of longitudinal ribs at a pitch equal to or less than the length of the long axis of the polygonal cell. A lead-acid battery featuring: