JPH06111799A - Manufacture of sealed type storage battery - Google Patents

Abstract

PURPOSE:To establish a manufacturing method which can smoothly yield a sealed type storage battery having a uniform exhaust pressure without impairing tight attaching of airtight sheets with each other at the periphery of an exhaust hole. CONSTITUTION:A space 6 is held at the periphery of a group of electrode plates, which are covered from the front and rear with airtight sheets 4 made of plastics to generate sealing, and boring is made through the sheets from the outer surface of the one to the outer surface of the other so that an exhaust hole 8 is formed which leads to the space 6. With this manufacturing method, a specified amount of silicone oil 7 is applied being split in specified positions on a part of the space 6 before the airtight sheets 4 are sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sealed storage battery.

[0002]

2. Description of the Related Art Conventionally, in a sealed type storage battery as disclosed in Japanese Patent Application Laid-Open No. 4-48548, a space portion is held around the electrode plate group so that the electrode plate group is made of a synthetic resin airtight from the front and back surfaces. Covering with a sheet, this airtight sheet is provided with an exhaust hole that communicates with the space portion, and by injecting oil into the space portion from this exhaust hole, the airtight sheets on the front and back surfaces are brought into close contact with each other around the exhaust hole. The safety valve action is generated.
However, with this oil injection method from the exhaust hole, since the exhaust hole is small, it takes too much time to inject, and the airtight sheet around the exhaust hole may be damaged or deformed. There was a risk of unevenness.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a manufacturing method for smoothly obtaining a sealed storage battery having a uniform exhaust pressure without impairing the adhesion of the airtight sheets around the exhaust hole.

[0004]

In order to achieve the above object, the present invention provides a space around the electrode plate group and covers the electrode plate group from the front and back sides with a synthetic resin airtight sheet. A method of manufacturing a hermetically sealed storage battery, which comprises sealing, and then forming an exhaust hole communicating from the one sheet outer surface of the airtight sheet to the other sheet outer surface to communicate with the space portion,
Before sealing the airtight sheets on the front and back surfaces, a predetermined amount of oil is applied in a divided manner at predetermined positions in a part of the space portion.

[0005]

When a predetermined amount of oil is applied to a part of the space before the air holes are formed in the airtight sheet, the oil application time can be shortened and the airtight sheet around the air holes can be damaged. It is possible to prevent it from being deformed, but before sealing the airtight sheets on the front and back sides, if a certain amount of oil is collectively applied to part of the space,
The diffusion direction of the oil is not fixed, and when the airtight sheet is sealed, it tends to flow into the joined portion of the airtight sheet and cause a joint failure, so in the present invention, before sealing the airtight sheet on the front and back surfaces, the space portion It is possible to prevent the inflow of the oil into the joint portion of the airtight sheet by defining the diffusion direction of the oil by dividing and applying the predetermined amount of oil to a predetermined position of a part of the above.

[0006]

EXAMPLE 1 FIG. 1 is a plan view of a main part showing Example 1 of a sealed type storage battery manufactured by the method of the present invention. As a sealed type storage battery, a comb-shaped positive electrode 1 and a negative electrode 2 are held in an electrolytic solution. An electrode group of electrodes arranged on the same plane through the body 3 is sandwiched between airtight sheets 4 made of synthetic resin having acid resistance from both front and back sides to form a sealed lead acid battery. A joint portion 5 in which the airtight sheets 4 on both the front and back sides are welded together at the peripheral portion.
And a space portion 6 is held between the joint portion 5 and a part of the periphery of the electrode plate group, and silicone oil 7 is applied in the space portion 6 to improve the sealing property. is doing. Reference numeral 9 is an auxiliary joining portion of the airtight sheet 4 on the front and back surfaces, which is partially provided near the exhaust hole 8.

FIG. 2 shows a manufacturing procedure (a) in the method of the present invention, in which a comb-teeth-shaped positive electrode 1 and a negative electrode 2 are fixed on the same plane of a single-sided airtight sheet 4 through an electrolytic solution holder 3, and this electrolysis is performed. The liquid holder 3 is impregnated with the electrolytic solution, and (b) silicone oil 7 is applied to a part of the space 6 toward three positions at regular intervals in the longitudinal direction of the space 6, as shown in FIG. At the same time, a three-port dispenser 10 as shown in FIG.
(c) Then, the airtight sheet 4 facing each other is laid over these to cover the electrode plate group, and the periphery of the airtight sheet 4 on both the front and back sides is heat-welded to form the joint portion 5, which is hermetically sealed. After the auxiliary joint portion 9 is provided in the space portion 6, the punching position of the exhaust hole 8 is determined, and the airtight sheets 4 on the front and back surfaces are pressure-contacted to that position, by an air drill from the outer surface of one sheet toward the outer surface of the other sheet. It is shown that the exhaust hole 8 is formed by penetrating it.

FIG. 5 is a plan view of an essential part showing a second embodiment of the sealed type storage battery manufactured by the method of the present invention. When the volume of the space portion 6 is twice as long as that of the first embodiment and is elongated, FIG. The silicone oil 7 is dropped and applied using a 5-port dispenser 11 as shown in FIG.

Example 1 and a conventional example in which silicone oil 7 is injected into the space 6 from an exhaust hole 8 in a sealed lead-acid battery of the same type as in Example 1, and a sealed lead-acid battery of the same type in which front and back surfaces are the same. Before sealing the airtight sheet 4, the space portion 6
In Comparative Example 1 in which a predetermined amount of oil is collectively applied to a part of the above, the silicone oil 7 is 4 m per sealed lead acid battery.
g and then apply a predetermined amount of silicone oil 7 to a part of the space 6 before sealing the airtight sheets 4 on the front and back sides with Example 2 and the sealed lead-acid battery of the same type as Example 2 In Example 2, silicone oil 7 was used as the sealed lead acid battery 1
Applying 8 mg per piece, making 50 pieces each, the average time required to apply oil per sealed lead acid battery, and the joint 5
The number of welding defects and the number of airtight defects as a safety valve action were counted.

The results show that the average time required to apply oil per sealed lead-acid battery is the same as in Example 1, Example 2, Comparative Example 1 and Comparative Example 2, but the conventional example is 15 times as long. It took time, and the number of welding defects and the number of airtight defects were both 0 in 50 sealed lead-acid batteries in Example 1 and Example 2, but 37 in Comparative Example 1, and Comparative Example In the case of 2, the number was 50, and in the conventional example, the number of occurrences of airtight defects was 3.

[0011]

As described above, according to the present invention, before sealing the airtight sheets on the front and back surfaces, a predetermined amount of oil is divided and applied to a predetermined position of a part of the space portion for a short time. In addition to being able to apply oil, the sealed storage battery having a uniform exhaust pressure in the exhaust hole can be obtained without impairing the adhesion between the airtight sheets around the exhaust hole, which is a great industrial value.

[Brief description of drawings]

FIG. 1 is a first embodiment of a sealed storage battery manufactured by the method of the present invention.
It is a principal part top view which shows.

FIG. 2 is an explanatory view showing manufacturing procedures (a), (b) and (c) in the method of the present invention.

FIG. 3 is a front view showing a three-port dispenser for oil application in the first embodiment.

FIG. 4 is a side view showing a three-port dispenser for oil application in the first embodiment.

FIG. 5: Example 2 of a sealed storage battery manufactured by the method of the present invention
It is a principal part top view which shows.

FIG. 6 is a front view showing a five-port dispenser for applying oil according to the second embodiment.

[Explanation of symbols]

1 is a positive electrode, 2 is a negative electrode, 3 is an electrolytic solution holder, 4 is an airtight sheet, 5 is a joint portion, 6 is a space portion, 7 is silicone oil, 8 is an exhaust hole, 9 is an auxiliary joint portion, and 10 is 3 ports. Dispenser, 11 dispensers

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koyo Sugimoto 2-1-1 Nishishinjuku, Shinjuku-ku, Tokyo Shin-Kindo Electric Co., Ltd. (72) Inventor Toshio Horie 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo No. Japan Telegraph and Telephone Corp. (72) Inventor Tsutomu Ogata 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp.

Claims (1)

[Claims] 1. A space is maintained around the electrode plate group, and the electrode plate group is covered and sealed from the front and back sides with an airtight sheet made of synthetic resin, and then, from one outer surface of the airtight sheet to the other. A method for manufacturing a hermetically-sealed storage battery, wherein an exhaust hole is formed by perforating toward the outer surface of the sheet to form an exhaust hole that communicates with the space portion, and before sealing the airtight sheets on the front and back surfaces, a predetermined position of a part of the space portion is provided. A method for manufacturing a sealed type storage battery, characterized in that a predetermined amount of oil is applied separately.