JPH04218259A - Lead acid battery - Google Patents

Abstract

PURPOSE:To prevent degradation of the service life in a pole plate group of a lead acid battery by arranging a glass mat between a cathode plate and an anode plate housed in a bag shape separator. CONSTITUTION:An anode plate 4 is housed in a bag shape polyethylene separator 1 laminating both side edges by means of welding or mechanical seal, and a glass mat 7 having width except at least width of a laminating part 3 in the separator 1 is arranged between an cathode plate 5 and the anode plate 4 independently of the separator 1. Thereby, even if a battery is used under a severe condition, degradation of the service life caused by short circuit between the anode plate 4 and the cathode plate 5 can be prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the performance of lead-acid batteries.

0002

2. Description of the Related Art Conventionally, when assembling a lead-acid battery, a plurality of anode plates and cathode plates were stacked together with separators to construct the necessary battery. At that time, the separator was assembled using a generally flat separator with a glass mat attached to it. In addition, recently, separators using synthetic resin materials such as polyethylene have been used as the separator material. Polyethylene separators can be made thinner than conventional separators, so they have the advantage of lower electrical resistance and better oxidation resistance.

0003

However, when the conventional polyethylene separator described above is used together with a glass mat, as shown in FIG.
The glass mat 2 is bonded to the glass mat 2, which is folded lengthwise and overlapped to form a bag shape.The bonded portion 3 is welded or mechanically sealed, so if the glass mat is in that area, the welding or mechanical seal There was a problem that the seal could not be made. Therefore, the width of the glass mat is set to a small width that takes into account the width of the separator bonded part.
In other words, the glass mat 2 whose both ends of the glass mat width do not reach the bonded part 3 of the separator is used as the separator 1.
It was adopted together with In FIG. 5, 4 is a cathode plate housed in the bag-like separator 1, and 5 is an anode plate. However, when the width of the glass mat 2 is made small in this way, when the lead-acid battery is used under harsh conditions, the anode plate 5 bends and comes into contact with the polyethylene separator 1, causing oxidative deterioration, as shown in FIG. In this portion 1S, the active material that has fallen off from the lattice may adhere and cause a short circuit with the cathode plate 4.

The present invention has been made in view of the above points, and its object is to improve the life performance of a lead-acid battery using a bag-shaped separator made of polyethylene or the like.

[0005]

[Means for Solving the Problems] In order to improve the problems of lead-acid batteries, the present invention places a cathode plate in a bag-shaped polyethylene separator whose both ends are bonded together by welding or mechanical sealing, and places it between the cathode plate and the anode plate. The present invention is characterized in that a glass mat having a width excluding at least the width of the bonded portion of the separator, or a glass mat having a width equivalent to the separator width is arranged separately from the separator.

[0006]

[Function] The arrangement structure of the glass mat according to the present invention prevents the anode plate from coming into contact with the cathode plate through the polyethylene separator due to the curvature of the anode plate during use, and improves the life of the anode plate. There is this effect.

[0007]

[Example] An example of the present invention will be explained. FIG. 1 shows the arrangement of glass mats in a battery A1 of the present invention, in which six glass mats each having the same width as one bag-shaped polyethylene separator are placed between an anode plate 5 and a separator 1. It is placed separately.

FIG. 2 shows the arrangement of the glass mats in the battery A2 of the present invention, in which the width of the glass mat 7 is the width of the bag-shaped polyethylene separator 1 excluding the width of the bonded part, and the width of the glass mat 7 is the width of the glass mat 7 that is the width of the anode plate 5. In between, the separator 1 and the separator 1 are arranged separately.

As shown in FIGS. 3 and 4, the batteries A1 and A2 of the present invention have a glass mat 6 covering the entire surface between the negative and anode plates 4 and 5 even if the anode plate 5 is bent during use under severe conditions. ，
7, a short circuit between the negative and anode plates 4 and 5 is prevented. Hereinafter, a battery life test according to the present invention will be explained in comparison with a conventional battery. Conventional battery B (Fig. 5) in which a glass mat is used integrally with a separator in which both ends of the glass mat width do not reach the bonded part of the mechanical seal of the polyethylene separator to form a bag shape (Fig. 5), and battery A1 according to the present invention
, A2. Battery is 12V, 5HR capacity 48A
A battery was manufactured and a life test was conducted. Test conditions are 7
It was carried out at 5°C. Charging: 14.8V, 10 minutes, discharging: 2
It was carried out at 5A for 4 minutes. FIG. 7 shows the transition of the discharge voltage at 30 seconds at that time.

0010

Effects of the Invention As mentioned above, the batteries A1 and A2 of the present invention
According to , the battery life can be improved by about 50% compared to the conventional battery B, which is effective in improving the life of lead-acid batteries.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which (a) is a top view and (b) is a front view.

FIG. 2 shows another embodiment of the present invention, in which (a) is a top view and (b) is a front view.

FIG. 3 is a state diagram of FIG. 1 after use;

FIG. 4 is a state diagram of FIG. 2 after use;

[Fig. 5] Shows a conventional example, (a) is a top view, (b)
is a front view.

FIG. 6 is a state diagram of FIG. 5 after use;

FIG. 7 is a comparative characteristic diagram showing changes in voltage at 30 seconds during a life test between the battery of the present invention and a conventional battery.

[Explanation of symbols]

1 is a polyethylene separator, 3 is a bonded portion, 4 is a cathode plate, 5 is an anode plate, 6 is a glass mat, 7 is a glass mat, A1 is a battery of the present invention, and A2 is a battery of the present invention.

Claims (2)

[Claims] Claim 1: A cathode plate is placed in a bag-shaped separator whose both ends are bonded together by welding or mechanical sealing, and a glass mat having a width excluding at least the width of the bonded portion of the separator is placed between the separator and the anode plate. A lead-acid battery with a group of electrode plates arranged separately from the lead-acid battery. 2. The lead-acid battery according to claim 1, which is a glass mat having the same width as the separator.