JPS5927477A - Manufacture of lead storage battery - Google Patents

Abstract

PURPOSE:To prevent any short circuits which might be caused by separation of the active material by forming a positive and a negative plate which are prepared by use of expanded grids or the like and a separator into a roll, and sealing lower ends of the separator which are located on both sides of the plate into sack-like form. CONSTITUTION:A positive and a negative plate 1 and 2 which are made by packing pasty active materials into expanded or punched grids, and a separator 3 made of a nonwoven fabric of thermoplastic resin fiber are formed into a roll. After that, lower ends of the separator 3 which protrude from the lower end of the plate 1 or 2 and are located on its both sides, are sealed into sack- like form, thereby constituting a lead storage battery. By the means mentioned above, in forming a roll-like plate group, the separator 3 can be smoothly rolled sealed into sack-like form without causing any creases. As a result, any short circuits which might be caused by the separation of the active material, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lead-acid battery comprising a group of paste-type positive and negative electrode plates using an expanded grid or a punched grid and wound into a roll with a separator interposed therebetween. Concerning the manufacturing method. - Conventional structure and its problems Cast lattice has been used for a long time in paste-type electrode plates of lead-acid batteries, but recently cast lattice and cast lattice, which are made by cutting and stretching lead or lead alloy sheets, have been used for a long time. , grids made by punching the sheet described above are being used.These expanded grids and punched grids have lighter plates compared to cast grids.

Not only is it advantageous for making it thinner, but it also allows the production of grids and the filling of active materials as continuous strip-shaped sheets.
This is extremely advantageous in terms of productivity.

Therefore, a method has been proposed in which each electrode plate is rolled together with a separator to form an electrode plate group, taking advantage of the characteristics of electrode plates using such expanded gratings or punched gratings.

On the other hand, in lead-acid batteries, when the active material falls off, moss-like lead grows on the negative electrode side and eventually reaches the positive electrode plate, often causing a short circuit. To prevent this, it is effective to wrap one of the electrode plates with a bag-shaped separator.

However, when forming a roll-shaped electrode plate group using electrode plates wrapped in bag-shaped separators, the bending diameter of the separator at the bent part of the electrode plate differs between the inside and outside, which causes wrinkles in the separator and , there is an inconvenience that positioning the separator becomes difficult.

Purpose of the Invention The present invention solves the above-mentioned inconveniences, and an object thereof is to provide a method for obtaining a roll-shaped electrode plate group in which the lower part of at least one electrode plate is sealed by separators on both sides thereof. do.

Structure of the Invention The present invention utilizes an expanded grid or a punched grid to roll the positive and negative electrode plates together with a separator, and then roll the lower ends of the separators located on both sides of one electrode plate. It is characterized by sealing.

In the present invention, after the electrode plate is rolled into a roll, the lower end of the separator is sealed to form a bag, so there is no inconvenience when winding the electrode plate into a roll, and moreover, it is possible to reduce the amount of active material used in batteries. There is no risk of a short circuit due to falling off.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a group of electrode plates wound into a roll. 1゜2 is a positive and negative electrode plate filled with paste-like active material in an expanded lattice, 3, 3 is a separator interposed between these electrode plates,
For example, it is made of a nonwoven fabric or a paper product made of thermoplastic resin fibers.

In the present invention, after the electrode plate is wound into a roll, the separators protruding from the lower end of the electrode plate are sealed, for example, with the separators on both sides of the positive electrode plate, so as to form a bag with the lower end sealed as shown in Fig. 3. It is something to do. The easiest way to seal the lower end of the separator is to use a thermally adhesive material for the separator and weld it.

Effects of the Invention According to the present invention, as described above, when forming a roll-shaped electrode plate group, the separator can be rolled smoothly without wrinkles, and the separator can be formed into a bag shape. Therefore, a lead-acid battery with excellent performance can be obtained without short circuits caused by falling off of the active material.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a group of electrode plates wound into a roll, Figure 2 1
l-1: Figure 1 is a sectional view taken along line 1-II', Figure 3 is a bottom view of the electrode plate group after separator sealing, Figure 4 is Figure 3 IV-
It is an r-line sectional view. 5 pages, 1...Positive plate, 2...Negative plate, 3
... Separator, 4 ... Seal part.

Claims (1)

[Claims] After pasted positive and negative electrode plates using expanded grids or punched grids are rolled together with separators,
A method for manufacturing a lead-acid battery, characterized by sealing the lower ends of separators located on both sides of one electrode plate.