JPS58175259A - Complex electrode plate for lead storage battery - Google Patents

Abstract

PURPOSE:To increase the mechanical strength of a plate for a lead storage battery, and prevent any separation of an active material from the right and the left sides of the plate which have no frame bones by fusing the right and the left non-framed sides of the expanded grid, which is packed with the active material, to the right and the left side ends of a micro-porous separator which covers the plate. CONSTITUTION:A micro-porous resin separator 1 is made of, for example, polyethylene, and has a length over twice the main part of an expanded plate 2 excluding its lag and a width larger than the width of the plate 2. The separator 1 is folded on its longitudinal center line in such a manner that the plate 2 is interposed between the two folded parts of the separator 1. Then the right and the left sides of the plate 2 which have no frame bones are fused to the right and the left side ends of the separator 1 so as to make a complex plate. Owing to the above constitution, any separation of an active material existing around the right and the left non-framed sides of the plate 2 which might be caused due to vibrations or the like can be securely prevented by fusing these sides to the separator 1. Besides, since the mechanical strength of the parts having no frame bones becomes larger than that of the expanded plate 2 it self, enhancement of the assembly efficiency of a lead storage battery can be expected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized by 1. This invention relates to a composite electrode plate for lead-acid batteries that integrates an electrode plate in which an expanded lattice is filled with a paste-like active material and a microporous resin separator covering the electrode plate.

Structure of the conventional example and its problems In a conventional electrode plate using an expanded lattice (hereinafter referred to as an expanded electrode plate 1), the active material on the left and right sides, which do not have frame ribs, is exposed during transportation of the electrode plate or when the electrode plate is transported. They have the disadvantage that they tend to fall off due to vibrations during group assembly, and the sides without frame ribs tend to bend during battery assembly. Therefore, in order to compensate for this drawback, the separator is made into a bag shape, and when inserting the expansion plate into the bag, the left and right sides without frame bones are placed on both sides of the separator in the direction of insertion. This method supplements the mechanical strength of the sides without frame ribs and contributes to improving the ease of assembling the battery. However, with this method, there is a slight gap between the left and right sides of the electrode plate that do not have frame ribs and the opposing side edges of the separator, so it is difficult to prevent the active material from falling off in these areas due to vibration. It is not effective enough to prevent it.

Purpose of the Invention The present invention solves these conventional problems and provides a lead-acid battery that has excellent mechanical strength and that can reliably prevent active material from falling off from the left and right sides of the electrode plates that do not have frame ribs. The purpose is to provide a composite electrode plate.

Structure of the Invention The present invention has the advantage of welding the left and right side edges of a separator to the left and right cut edges of an expanded electrode plate filled with an active material that do not have frame ribs. The present invention is characterized by providing a composite electrode plate for a lead-acid battery that prevents active material from falling off from the sides and improves the mechanical strength of the sides that do not have frame ribs.

As a separator made of a material that can be welded to the lattice and active material in an expanded electrode plate, for example, there is a microporous polyethylene separator, which covers the electrode plate from both sides. The opposing side end of the separator and the electrode plate grid or active material are welded to each other by thermal welding, ultrasonic welding, or the like. In addition, when welding the separator and the expanded electrode plate, it is preferable to simultaneously weld the separators protruding to the outer side of the electrode plate.

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

As shown in FIG. 1, as a microporous resin separator 1,
For example, a microporous polyethylene separator whose length is more than twice the length of the main part of the expanded electrode plate excluding the ears, and whose width is wider than the width of the electrode plate is placed at the center of its length. Fold it in half and place the expanded electrode plate 2 between them. Then, the left and right sides of the expanded electrode plate that do not have frame ribs and the opposing left and right side ends of the separator are thermally welded to form a composite electrode plate. FIGS. 2 and 3 are a schematic perspective view and a top view showing this composite electrode plate. In the figure, 3 is a welded portion between the side edge of the separator 1 and the expanded electrode plate 2, 4 is a welded portion between the separators protruding outside the electrode plates, and 5 is an electrode plate edge.

In this composite electrode plate, the left and right side edges of the separator and the left and right side portions of the expanded electrode plate without frame ribs are integrated, and the width of the separator is wider than the width of the electrode plate, resulting in a bag-like sag. However, the left and right sides of the electrode plate are welded to the separator,
Furthermore, since the outside is surrounded by the welded portions of the separators, it is possible to eliminate the drawbacks of conventional expanded electrode plates or those that could not be overcome even by inserting expanded electrode plates into bag-shaped separators. In other words, by welding the active material to the separator, it is possible to reliably prevent the active material present on the left and right sides of the electrode plate where there are no frame ribs from falling off due to vibrations, etc. This increases the mechanical strength of the parts that are not covered, and is expected to improve the ease of battery assembly.

Effects of the Invention In addition to increasing the mechanical strength of such a composite electrode plate, the active material present at the edge of the side without frame ribs does not fall off within the separator, so the active material in this part also increases. It can be used effectively and the discharge performance and life of the electrode plates as a lead-acid battery can be improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an expanded electrode plate sandwiched between separators in an embodiment of the present invention, and Fig. 2 is a schematic perspective view of a composite electrode plate in which the separator side end is heat welded to the part of the electrode plate that does not have a frame. , FIG. 3 is a top view thereof. 1... Separator, 2... Expanded electrode plate, 3... Welded part between separator and electrode plate,
4... Welded part between separators, 6...
... Pole plate ears. Figure 1

Claims (1)

[Claims] A composite electrode plate for a lead-acid battery, in which the left and right sides of an expanded lattice filled with an active material that do not have frame ribs are welded to the left and right side ends of a microporous resin separator that covers the electrode plate.