JPS61277153A - Enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To improve the service life of cell when employing trickle recharge by employing double layer separator composed of glass fiber layer having specific average fiber diameter and polyethylene or polypropylene fiber layer. CONSTITUTION:Double layer separator composed of glass fiber layer having average fiber diameter shorter than 5mum and polyethylene or polypropylene fiber layer having average fiber diameter shorter than 12mum is employed. Consequently, reduction of the thickness of separator is retarded even for long term trickle recharging thus to produce a separator having excellent tightness. When the average fiber diameter of glass fiber layer exceeds over 5mum or the average fiber diameter of polyethylene or polypropylene fiber layer exceeds over 12mum, the maximum hole diameter of separator will increase to cause shortcircuit of positive and negative plates resulting in deterioration of service life.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a separator for a sealed lead-acid battery.

BACKGROUND OF THE INVENTION Sealed lead-acid batteries are used as power sources or backup power sources for many portable devices due to their high cost efficiency and ease of handling.

Conventionally, this type of battery has used a glass mat-like separator made of glass fibers with an average fiber diameter of 4 μm or less.

Problems to be Solved by the Invention However, with such conventional storage batteries, when using trickle charging as a backup power source, the adhesion of the separator interface that comes into contact with lead dioxide, which is the positive electrode, decreases and the electrolyte decreases due to electrolysis. There was a drawback that an accompanying decrease in capacity occurred.

An object of the present invention is to provide a separator that reduces the decrease in separator thickness even during long-term trickle charging and has excellent adhesion.

Means for Solving the Problems In order to solve the above problems, the present invention has an average fiber diameter of 6.
A layer consisting of glass fibers of less than μm and an average fiber diameter of 12
A separator with a two-layer structure consisting of polyethylene or polypropylene fibers of μ carbon or less is used.

Function: In the sealed lead acid battery of the present invention equipped with such a separator, it is possible to increase the battery life when trickle charging is used.

Example The present invention will be explained in detail below.

A lattice made of Pb-CIL-8n alloy was used as the positive electrode plate.

Filled with pastera consisting of lead oxide, water, dilute sulfuric acid, etc.

As a negative electrode plate, a lattice made of Pb-Ca-8n alloy was filled with a paste made of lead oxide, water, dilute sulfuric acid, barium sulfate, etc., and each was chemically formed and combined with a separator to create a 12v2mh battery. did. The battery has a glass fiber layer with an average fiber diameter of 4 μm and an average fiber diameter of 10 μm.
QB using a separator consisting of a polyethylene layer of
, using a separator made of the same glass fiber layer as battery B and a polypropylene layer with an average fiber diameter of 10 μm - 6c
The thickness ratio of the glass fiber layer and the synthetic fiber layer was 2:1.

In addition, for comparison, a battery was created using a separator made of a glass fiber layer with an average fiber diameter of 4 μm or less.

These batteries were trickle charged at a constant voltage of 2.3 V per cell and a maximum current of 0.8 μm, and a capacity test was performed by discharging at a constant current of 0.5 people every month. Trickle charging was performed at 45° C., discharging at 25° C., and the end of life was determined when the capacity reached 50% of the initial value.

As shown in the figure, compared to a battery using a separator made of a glass fiber layer, a battery B using a separator having a two-layer structure consisting of a glass fiber layer and a polyethylene layer, and a battery B using a separator having a two-layer structure consisting of a glass fiber layer and a polypropylene layer. It has been shown that the trickle life characteristics of battery C using a separator having this structure are excellent.

In addition, the average fiber diameter of the glass fiber layer is over 6 μmf, and the average fiber diameter of the polyethylene or polypropylene fiber layer is 1 μmf.
If it exceeds 2 μml, the maximum pore diameter of the separator becomes large, and the positive and negative electrode plates are likely to be short-circuited, resulting in a shortened battery life. Therefore, it is desirable that the average fiber diameter of the glass fiber layer is 5 μm or less, and the average fiber diameter of the polyethylene or polypropylene fiber layer is 12 μm or less.

Effects of the Invention As is clear from the above embodiments, the battery of the present invention can have improved life characteristics during trickle charging, and can be used as an excellent power source battery.

[Brief explanation of the drawing]

The figure is a diagram showing the life characteristics of the battery of the present invention and a conventional battery. Name of agent: Patent attorney Toshio Nakao and 1 other person8
Product Turtle ♀ Mi), #@Sosetsu-Kisa

Claims (1)

[Claims] A sealed lead-acid battery characterized by using a separator having a two-layer structure including a layer made of glass fibers having an average fiber diameter of 5 μm or less and a layer made of polyethylene fibers or polypropylene fibers having an average fiber diameter of 12 μm or less.