JPS601757A - Manufacture of sealed lead storage battery - Google Patents

Abstract

PURPOSE:To improve and stabilize the capacity of a liquidless sealed lead storage battery by using positive and negative plates prepared by covering plates with fibrous woven members made of glass and the like during packing of a paste before the covered plates are dried. CONSTITUTION:When a raw paste is packed, positive and negative plates are covered with woven members made of fiber with a diameter of below 6mum principally composed of glass. The plates are then pressed and dried. For instance, immediately after a raw paste is packed to make positive and negative plates, separators made of glass fiber of 1mum diameter are pressed upon the surfaces of the positive and the negative plates before they are pressed and dried. After that, the dried plates are stacked together while applying a pressure of about 10kg/dm<2> to the plate group, thereby constituting a battery. A battery may be constituted in the same manner as above by using either a separator made of glass fiber of 6mum diameter or a separator prepared by mixing 80% glass fiber of 1mum diameter and 20% acrylic fiber of 1mum diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sealed lead-acid battery, and its object is to obtain a stable sealed lead-acid battery with improved capacity and weight performance.

In so-called electrolyte-depleted sealed lead batteries in which the electrolyte is held in the separator and the positive and negative electrode active materials, unlike ordinary lead batteries that have an excess of electrolyte, the electrolyte in the separator and the positive and negative electrode active materials is An electric current flows through the liquid contact. For this reason, in a sealed lead-acid battery, it is particularly necessary to maintain sufficiently strong contact between the positive and negative electrode plates and the separator. However, it is generally known that when a separator is immersed in an electrolytic solution, the 1-uAI11# slip becomes better due to wetting, and the separator shrinks significantly under constant pressure. For this reason, even if considerable pressure is applied during assembly to ensure sufficient contact between the separator and the positive and negative electrode plates, there is a risk that contact between the separator and the active material will deteriorate when the electrolyte is poured. In addition, when producing a battery with a constant pressure force per unit area,
The larger the plate becomes, the more pressure must be applied to the plate group in proportion to its apparent surface area, and it is extremely difficult to actually manufacture a battery while applying sufficient pressure to the large plate. It is.

In the present invention, by covering both sides of the electrode plate with a fiber intersection complex such as glass fiber and pressurizing it when filling the raw paste, a 2PR porous body consisting of an active material and a fiber intersection complex is made into a continuous structure, thereby achieving the above-described structure. This solves the problem of contact between the active material and the separator.

The present invention will be described below with reference to one embodiment.

Table 1 shows the initial 3OA (10hR) discharge test results for a liquid-solid sealed lead battery with a capacity of 300Ah. Symbol 2-1 is a sealed lead-acid battery manufactured using the conventional manufacturing method.The positive electrode plate, the glass fiber separator with a 1φμ claw, and the negative electrode plate are stacked together, and the pressure applied to the electrode plate group during assembly is approximately 10Kq/dn.
It was made as i. Symbols 2 to 4 indicate the discharge performance of sealed lead batteries manufactured using the method of the present invention. First, in symbol 2, a glass m-fiber separator of 1φμm is pressed on both sides of the positive and negative electrode plates immediately after filling with raw paste, and after applying pressure, the dried electrode plates are stacked on top of each other, and the pressure applied to the electrode plate group during assembly is reduced. Approximately 10Kq/do? This is a battery manufactured as follows.

Symbols 3 and 4 are batteries manufactured in the same manner as above using a separator of 6φ/l III glass fiber string separator or a separator containing 80% of 1φμm glass fiber and 1φμm acrylic It (F20%). 5 is a battery manufactured in the same manner as the batteries with symbols 2 to 4 using a glass fiber separator of 12φμm as a separator.In this test, each of the batteries with symbols 1 to 5 was
Table 1 shows the variation in discharge duration and the average discharge duration.

In the battery 1 produced by the conventional method, the average discharge duration is short, and the variation in battery capacity is very large. This is considered to be because the contact between the electrolytic solution held by the separator and the positive or negative electrode active material is unstable. On the other hand, a battery 2 according to the method of the present invention using a positive electrode plate and a negative electrode plate prepared by applying a separator mainly made of glass fiber or glass 111 of 6φμm or less to the electrode plate and drying it under pressure when filling the green paste. .3.4 all showed excellent initial capacity, and the variation in capacity was also very small.

In addition, in battery 5 manufactured by the same method as the method of the present invention using a 12φμm glass fiber separator, battery 2.3.4
The initial capacity was inferior to that of . This is considered to be because [because the fiber diameter of the parator is large, the space between the fibers is also large, which deteriorates the liquid retention performance of the separator, and the amount of electrolyte retained by the separator decreases. These results show that according to the method of the present invention, the positive and negative electrode active materials and the separator are formed into a continuous porous structure, which eliminates the problem of contact and provides a battery with stable and excellent performance. Recognize. In addition, the fiber diameter of the glass fiber used is 6φμ-
If this value is exceeded, the electrolyte holding capacity of the separator deteriorates and the amount of electrolyte retained in the separator decreases, as in the case of the battery with symbol 5. It was confirmed through experiments that the supply of liquid became poor and the capacity decreased.

Claims (1)

[Claims] Liquid-solid sealing characterized by using a positive electrode plate and a negative electrode plate which are coated on both sides of the electrode plate with a m-fiber crossing complex mainly composed of glass having a size of 6φμ or less when filling the raw paste, and are dried after being pressurized. Method for manufacturing lead-acid batteries.