JPS62216159A - Separator for sealed type lead-storage battery - Google Patents

Abstract

PURPOSE:To stabilize contact with a plate for a long time so as to improve storage properties, by using a specific separator having elasticity. CONSTITUTION:Two kinds or more of mixture, including at least glass fibers, selected among glass fibers, high molecular fibers and impalpable powder with sulfic acid resistance, are combed in paper form on a base material of a continuous bubble high molecular foaming material with sulfic acid resistance. If a separator is formed by using said mixture, elasticity is imparted so that an area in contact with an electrode plate is stabilized for a long time, thereby it is possible to improve storage properties.

Description

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

BACKGROUND OF THE INVENTION As characteristics of conventional separators for sealed lead-acid batteries, mechanical strength, electrolyte absorption amount, electrolyte absorption speed, etc. are considered to be important.

A conventional separator for a sealed lead-acid battery will be described below.

Conventional separators for sealed lead-acid batteries use acrylic resin fibers as a reinforcing material and gelatin as a reinforcing material.

It is a nonwoven fabric made from oxidation- and acid-resistant glass fiber using starch as a binder.

Problems to be Solved by the Invention However, the above-mentioned conventional separators for sealed lead-acid batteries have the problem of shrinking over time after a long period of time after battery assembly, resulting in a reduction in the contact area with the electrode plates. had.

This problem causes insufficient diffusion of the electrolyte into the electrode plates, which causes a decrease in recovery capacity when a sealed lead-acid battery is stored for a long period of time.

The present invention solves the above-mentioned conventional problems, and aims to impart elasticity to the separator, stabilize the contact area with the electrode plates over a long period of time, and improve the storage characteristics of the battery.

Means for Solving the Problems In order to achieve this object, the separator for a sealed lead-acid battery of the present invention is made of a sulfuric acid-resistant open-cell polymer foam as a base material, and glass fiber is added to the open-cell polymer foam as a base material.

The paper is made of a mixture of two or more types of sulfuric acid-resistant polymer fibers and sulfuric acid-resistant fine powders, including at least glass fibers.

Function: With this configuration, it is possible to improve both the adhesion of the separator for a sealed lead-acid battery to the cathode plate and the diffusion of the electrolyte to the cathode plate.

Therefore, even after long-term storage of the battery, the amount of electrolyte light ffA in the cathode plate does not change significantly, and deterioration of storage characteristics due to cathode domination can be suppressed.

EXAMPLES Examples of the present invention will be described below with reference to the tables.

The separator for a sealed lead-acid battery of the present invention has a sulfuric acid-resistant open-cell polymer foam as a base material, and at least one glass fiber, a sulfuric acid-resistant polymer fiber, and a sulfuric acid-resistant fine powder. Paper is made from a mixture of two or more types of fibers.

Table 1 shows the properties/ft of the separator A of the present invention and the conventional separator B.

Separator A of the present invention is made of polyethylene foam with a foaming rate of 96% and glass fibers with an average fiber diameter of 0.7/l.
g 7m”, sq SiO2 with an average particle size of 3μ
/m' paper.

Furthermore, conventional separator B has an average fiber diameter of 0.7 lt.
This paper is a mixture of 96% glass fiber and 5% acrylic binder.

Table 1 In the table, * is the water content when 1 d of dry water is soaked with ion-exchanged water and a pressure of 2 o Ky/dm is applied for 1 minute, and ** is the water content measured using the surface tension of methanol. The maximum pore diameter *** shown is a value measured according to JIS C2313.

Using such separators A and B, voltage 12v1 capacity 2. OAh batteries A and B were manufactured.

Table 2 shows the capacity recovery rate at the first cycle of batteries A and B after storage for two years at room temperature (capacity at the first cycle after storage/initial capacity
1oO).

Table 2 As described above, according to this example, 19,097 m" of glass fibers with an average fiber diameter of 0.7 μm were added to a polyethylene foam with an expansion rate of 96 cm, and 5102 sq.
By making 7 m2 paper, elasticity can be imparted to the separator and the contact area with the electrode plates can be stabilized over the long term. Therefore, it is possible to improve the diffusion of the electrolyte to the electrode plates, and it is possible to significantly improve the capacity recovery of a sealed lead-acid battery after long-term storage. The figure shows the voltage characteristics during constant current discharge of a sealed lead-acid battery using the separator of the present invention, A is the characteristic of the battery using the separator of the present invention, B is the characteristic of the battery using the conventional separator, and C is the initial capacity of both batteries. Show characteristics.

Effects of the Invention The separator for a sealed lead-acid battery of the present invention is made from a paper made of a mixture of two or more types of sulfuric acid-resistant fine powder and at least glass fiber, thereby imparting elasticity to the separator and improving the bond between the electrode plates and the separator. The contact area can be stabilized over the long term.

This can improve the diffusion of the electrolyte to the electrode plates, and can significantly improve the capacity recovery of the sealed lead-acid battery after long-term storage. However, this will significantly improve the reliability of sealed lead-acid batteries.

[Brief explanation of drawings]

The figure is a diagram showing voltage characteristics of constant current discharge of a sealed lead-acid battery using a separator according to the present invention and a conventional separator. A: Characteristics of a battery using the separator according to the present invention, B: Characteristics of a battery using a conventional separator, C: Initial capacity characteristics of batteries A and B. Name of agent: Patent attorney Toshio Nakao and one other representative
r:I(h)

Claims (1)

[Claims] Paper making using a sulfuric acid-resistant open-cell polymer foam as a base material, and a mixture of two or more types of glass fiber, sulfuric acid-resistant polymer fiber, and sulfuric acid-resistant fine powder containing at least glass fiber. A separator for sealed lead-acid batteries.