JPH0318300B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present 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. It is something.

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), the active material on the left and right sides, which do not have frame ribs, is exposed during transportation of the electrode plate or during assembly of the electrode plate group. It has the disadvantage that it tends to fall off due to vibration, and the sides without frame ribs tend to bend when assembling the battery. Therefore, in order to compensate for this drawback, the separator is made into a bag shape, and when inserting the expandable plate into the bag, the left and right sides that do not have frame bones are placed on both sides 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, in 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,
An object of the present invention is to provide a composite electrode plate for a lead-acid battery that has excellent mechanical strength and can reliably prevent active material from falling off from the left and right sides of the electrode plate that do not have frame ribs.

Composition of the Invention The present invention is capable 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 have no frame ribs. The present invention is characterized by providing a composite electrode plate for a lead-acid battery, which prevents the active material from falling off from the frame and improves the mechanical strength of the sides without 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. 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. Note that when welding the separator and the expanded electrode plate, welding the separators that protrude outside the electrode plate together at the same time prevents the active material from falling off from the left and right side parts of the electrode plate that do not have frame ribs. preferred.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in Fig. 1, the microporous resin separator 1 is, 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 A piece wider than the width of the electrode plate is folded into two in a U-shape at the central part in the length direction, and the expanded electrode plate 2 is placed in between. Then, the left and right sides of the expanded electrode plate without the frame plate and the opposing left and right side plates of the separator are thermally welded to form a composite electrode plate. Second
3 are a schematic perspective view and a top view showing this composite electrode plate. In the figure, 3 is the welded part between the side edge of the separator 1 and the extended electrode plate 2, 4 is the welded part between the separators protruding outside the electrode plate, and 5
is the electrode tab.

In this composite electrode plate, the left and right side edges of the separator are integrated with the left and right side portions of the expanded electrode plate without frame ribs, 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, and the outside is surrounded by the welding of the separators. You can overcome weaknesses that you have never been able to overcome. In other words, the falling off of the active material present on the left and right side parts of the electrode plates without frame ribs due to vibration etc. can be reliably prevented by welding them to the separators and by welding the parts of the separators that protrude from the electrode plates. At the same time, the mechanical strength of the part without frame ribs is higher than that of the expanded electrode plate alone, and it is expected that the battery assemblability will be improved.

Effects of the Invention In addition to increasing the mechanical strength of such a composite electrode plate, the active material present at the end 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 drawings]

Figure 1 is a perspective view of an expanded electrode plate sandwiched between separators in an embodiment of the present invention;
The figure is a schematic perspective view of a composite electrode plate in which the side end of the separator is heat-welded to a portion of the electrode plate that does not have a frame, and FIG. 3 is a top view thereof. 1... Separator, 2... Expanded electrode plate,
3... Welded portion between the separator and the electrode plate, 4... Welded portion between the separators, 5... Electrode plate lug.

Claims (1)

[Claims] 1 Heat the left and right sides of the expanded lattice filled with active material that do not have frame ribs, and the left and right side edges of a heat-weldable microporous resin separator that is wider than the electrode plate and covers both the front and back sides of the electrode plate. A composite electrode plate for lead-acid batteries in which the separators protruding from the left and right sides of the electrode plate are integrated by heat welding or ultrasonic welding, and are integrated by welding or ultrasonic welding.