JPS60220549A - Enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To keep off a liquid leakage attendant upon gas discharge, by holding a plate group with filmlike or sheetlike synthetic resin bodies in between and disposing them by heat in leaving an exhaust port part intact, while making the exhaust port of a porous mat so as to be opened at a time when battery internal pressure is higher than outside pressure. CONSTITUTION:A plate group 4 consisting of a positive plate, a negative plate and a fibroid separator is held with filmlike or sheetlike polyethylene 5 in between, while a bottom part and symmetrical side parts alone are deposited by heat (3), forming a battery jar, and a dilute sulfuric acid electrolyte is poured in from the top of an undeposited part. Next, a glass fiber-make mat 6 is put in an exhaust port part, and again an upper part of the battery jar and the exhaust port part are deposited by heat, and sealing for each of plate poles 2 takes place, and simultaneously each of undeposited parts 1b and 1c where these polyethylene parts 5 are parallelly opposed without any clearance is formed. These undeposited parts are opened, discharging gas, when internal pressure of the battery is higher than outside pressure but in time of being lower, these parts are closed so as to hermetically seal the clearance.

Description

[Detailed Description of the Invention] i(,: industry) is related to sealed lead-acid batteries, especially flat 31
11 The purpose of this invention is to improve the exhaust port of a sealed lead foil battery.

Conventional configuration and problems Sealed lead-acid batteries have a separator made of glass fiber, positive electrode plate, and negative electrode plate that hold the electrolyte, so the electrolyte does not overflow outside when charging, making it convenient to carry. It is widely used as a small power source, and there are many types of shapes, capacities, etc. Recently, an inexpensive storage battery has been devised in which a group of electrode plates is sandwiched between film-like or sheet-like synthetic resin bodies and an electrolyte is injected into the battery.

Figure 1 shows an example of the configuration of a conventional sealed lead-acid battery, in which the electrode group 4 consisting of a positive electrode plate, a negative electrode plate, and a separator is made of acid-resistant film-like or sheet-like polyethylene that is resistant to welding. 5, and leaving only the unwelded portion that will become the exhaust port 1, heat weld 3 is formed around the electrode plate group 4 including the pole pillar 2, thereby constructing the electric housing.

This type of battery is configured with an unwelded capital 1 that serves as an exhaust port, so when the internal pressure of the battery is higher than the external pressure, the exhaust port opens and gas is released from the gap, and conversely, the internal pressure of the battery is lowered to the outside. The exhaust port served as a safety valve, closing when the air pressure was lower than the atmospheric pressure, preventing the battery from swelling or exploding. However, in such a structure, when gas is generated during charging, the electrolytic solution impregnated in the positive electrode plate and the negative electrode plate is drawn out and attached to the exhaust port 1 at the upper part of the electrode plate group together with the gas as droplets. In the lower part, the electrolytic solution accumulated in the combined part of the hot melt 43 parts flows into the υ11 part part 1 when the battery is turned upside down. Inside these exhaust port parts 1 (・Ji', 'i',
The accumulated electrolyte forms a capillary 1a as shown in Figures 2 and 3.
Due to this phenomenon, the opening end 1a of the exhaust port 1 was leaked, and when the internal pressure of the battery increased and the exhaust port 1 was opened, there was a problem of leakage of the electrolyte as well as the gas.

Purpose of Departure J Purpose of Failure 1 is to solve the problems of the conventional method.A breathable mat made of glass fiber or the like can be placed in one part of the exhaust port to prevent liquid leakage due to gas discharge. That's what I saw f'l(J
shall be.

+1M1j Akira of [Origin] The sealed lead-acid battery of the present invention sandwiches an electrode plate group consisting of a positive electrode plate, a negative electrode plate, and a separator between acid-resistant and heat-weldable film-like or sheet-like synthetic resin bodies, The film-like and sheet-like synthetic resin material around the electrode plate group is thermally welded, leaving an unmelted 2゛ part that will become the exhaust port, and a breathable mat is attached to a part of the exhaust port. The exhaust ports at the top and bottom of the mat open when the battery's internal pressure is higher than the outside air pressure to release gas from the gap, and conversely close when the battery's internal pressure is lower than the outside air pressure to fill the gap. A feature is that the synthetic resin bodies of the exhaust port are arranged parallel to each other without any gaps. With such a configuration, liquid leakage can be prevented.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

1 positive electrode plate (50 m long x 70 mm wide x 3.0 m thick)
m).

2 negative electrode plates (wL5Qmm x width 70mm x thickness 1.
3 mm) and a glass fiber separator, which is the same as the first electrode plate group 4, is made of acid-resistant and heat-weldable material having a thickness of 0.3 mm.
Sandwiched between two 3 mm film or sheet polyethylene sheets 5, only the bottom and left and right sides of the electrode plate group 4 were heated at 160° C. by heat pressing.
Heat from the outside of the IWJ for 4 f to melt the polyethylene mutually.
3 and then try to electrify the area by injecting the specified dilute sulfuric acid electrolyte from above the unwelded area. In this embodiment shown in FIGS. 4 and 6, after injecting the electrolyte, a glass fiber plate 6 is placed in a predetermined position of the exhaust port, and the upper part of the mold and the exhaust port are heated again under the same conditions. By melting the frost, the pole column 2 is sealed, and at the same time, the two film-like or sheet-like polyethylene 5 are unmelted;
b and 1C are formed. When the internal pressure of the battery is higher than the outside air pressure (when the pressure is applied), the unmelted metal 11 of the glass cape 6 (part 1b and door 1c) opens and generates electricity from the front of the plate through the gap. When the pressure is low (when the pressure is reduced), it closes and closes the gap.

For comparison with the batteries of this example, 100 conventional batteries each having the same configuration but without the glass manotro as shown in FIGS. 1, 2, and 3 were prepared.

After fully charging these batteries,
A was turned downward (inverted position), and the battery was charged with a current of 0.1 CA for an additional hour, and the rate of leakage from the exhaust port end 1a was investigated, as shown in the following table.

In this example, some electrolyte exists in the lower part 1C of the exhaust port 1 on the -F side than the manotro, but it does not exist at all in the upper part 1ηS1b, and the electrolyte is absorbed by the glass manotro. Therefore, liquid leakage due to exhaust as seen in the conventional example does not occur.

Effects of the Invention As described above, by arranging a glass cloak in a part of the exhaust section, a highly reliable sealed lead-acid battery without leakage can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a conventional sealed lead-acid battery;
Figure 2 is an enlarged view of the exhaust port of a sealed lead-acid battery in a conventional example (an enlarged view of the exhaust port of a sealed lead-acid battery in one example). Figure 3 is an enlarged sectional view of Figure 2. Figure 6 is an enlarged sectional view of Figure 4. 1... Antagonist port j119.1a... Exhaust 1
” Self-end, 1b. 1C...Undissolved layer part at the exhaust port, 3...
Melting 4'J part, 4... Plate group, 5... Film-like or sheet-like polyethylene, 6... Glass fiber thread 11: Mat made.

Claims (1)

[Claims] 111 The film-like or sheet-like synthetic resin body around the electrode plate consisting of the 111-layer plate, the negative plate and the separator is i'lj.
(In addition to heat welding, leaving the unfused neck part that will become the exhaust L1 capital, a breathable mat is placed on a part of the exhaust port, and the upper and lower parts of the mat are exhausted [1] is when the internal pressure of the battery is lower than the external pressure. When the exhaust port part is opened, gas is released from the gap, and when the internal pressure is lower than the outside pressure, it is closed and the gap is honeymooned.
A sealed 1-vinyl lead-acid battery.