JPH01161663A - Valves for sealed lead-acid batteries - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a valve for a sealed lead-acid battery.

2. Prior Art Conventionally, this type of sealed lead-acid battery valve uses a cap-type rubber valve 1 as shown in Fig. 2, whose role is to exhaust oxygen gas or hydrogen gas generated during charging and to provide airtightness. It lies in the preservation of sexuality. The gas is exhausted at a valve operating pressure determined by the rubber material, hardness, etc. In addition, the airtightness is maintained by the close contact between the inner wall of the rubber valve and the battery opening that forms the valve seat 2, but since there is a limit to the smoothness of the valve seat 2 that can be obtained by machining, in reality, silicone oil 3 etc. are used to smooth the valve seat 2. It seals the gap between.

Problems that the invention aims to solve With such a conventional configuration, the electrolyte overflows when the valve is open, the silicone oil deteriorates the rubber of the valve body, and the electrolyte adheres to the rubber part of the battery case. There were problems such as the rubber valve being glued together and the valve not opening, and the silicone oil leaking out and the valve not opening properly.

The present invention solves these problems and aims to provide a valve for a sealed lead-acid battery that does not cause overflow and has high reliability in opening and closing the valve.

Means for Solving the Problem In order to solve this problem, the present invention provides that the maximum pore diameter is 0.
Porous film of 1-10μm, viscosity 60-300c
The present invention provides a valve for a sealed lead-acid battery coated with a non-volatile liquid having a surface tension of 20-100 dyn/ctn. In particular, it is preferable that a liquid reservoir is provided in the upper part of the porous film, that the porous film is made of polyethylene, and that the nonvolatile liquid is silicone oil.

Function: With this configuration, it is possible to provide a valve for a sealed lead-acid battery that does not require bath liquid and has high reliability in opening and closing the valve.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG.

An unformed electrode plate is inserted and chemical formation takes place inside the battery.

In the process of producing so-called batteries, it takes 3 times longer than before.
Inject more fluid. After that, as shown in Figure 1, the thickness is 5
0μ polyethylene porous film 4 (P than Nitto type)
A uniaxially stretched E film (maximum pore diameter of about 0.2 μm) is pasted and sealed around the periphery of the liquid injection port 6 by heat welding. Furthermore, a tube 6 having the same inner diameter and height as the battery opening and having a height of 2 is welded or adhered thereon to form a liquid reservoir 7. The viscosity is 300 cs in the cylinder 6.
silicone oil (Shin-Etsu Silicone Ring KF96H).

300cs) 3 is applied to battery A. A battery made in the same manner as this and equipped with a conventional cap valve shown in FIG. 2 is designated as battery B. Both batteries under the same conditions? ! When cypress chemical conversion was performed, electrolyte overflowed in battery B while the valve was open when gas was generated.

On the other hand, there was no overflow of electrolyte into the battery.

On the other hand, the valves shown in FIGS. 1 and 2 are installed, and the inside is hollow.
We made so-called static tanks and prepared them as tanks A and B by making holes in areas that do not affect the function of the valve. Air was sent through each hole, and when pressurized, the air would come out of the valve. It was confirmed that the pressure did not exceed a certain level, and that when pressurization was stopped, air flow stopped at a certain level.

After that, apply the silicone oil to the area with a specific gravity of 1.
After applying 30% sulfuric acid and standing at 60°C for one week, the same test was conducted to observe whether the valve opened or closed. In case B, the upper limit of the pressure in the pressurized state was three times the initial value, but the second time it was the same as the initial value. This means that the resin of the battery case material and the rubber of the cap valve have adhered to each other due to the sulfuric acid. Moreover, in case A, there was no difference from the initial stage.

In battery A, the maximum pore diameter of the porous film of the valve was 0.
If it is less than 1μ, the ventilation resistance is too high, and if it is more than 10μ, liquids with a surface tension of less than 10Odyn/cm will pass through. Also, if the surface tension is less than 2°dyn/cm, it will pass through a 0.1μ hole, and if the surface tension is 100dyn/cm, it will pass through a 0.1μ hole.
In the above case, after the gas passes through the holes in the film, it becomes separate droplets, so it cannot function as a valve.

Also, if the viscosity of the liquid is less than 50 cs, there is a risk that it will flow out when the liquid is turned sideways;
If it is S or more, the ventilation resistance is evened out.

Therefore, a porous film with a pore size of 0.1-10μ has a viscosity of 5O-300cs and a surface tension of 20-1Od yn.
A valve coated with 7 cm of non-volatile liquid is suitable as a valve for a sealed lead-acid battery.

Effects of the Invention As described above, according to the present invention, it is possible to provide a valve for a sealed lead-acid battery that does not require bath liquid and has high reliability in opening and closing the valve.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a valve using a porous film according to the present invention, and FIG. 2 is a diagram showing a conventional cap valve. 1... Cap type rubber valve body, 2... Valve seat, 3... Silicone oil, 4...
LL quality film, 6... Liquid injection port, 6...
・Cylinder, 7...Liquid pool.

Claims (4)

[Claims] (1) A porous film with a maximum pore diameter of 0.1 to 10 μm, a viscosity of 50 to 300 cs, and a surface tension of 20 to 100 dy.
A valve for a sealed lead-acid battery, characterized in that it is coated with a non-volatile liquid of n/cm. (2) The valve for a sealed lead-acid battery according to claim 1, characterized in that a liquid reservoir is provided in the upper part of the porous film. (3) The valve for a sealed lead-acid battery according to claim 1, wherein the porous film is made of polyethylene. (4) The valve for a sealed lead-acid battery according to claim 1, wherein the nonvolatile liquid is silicone oil.