JP2001148250A - Oil-immersion type battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a desirable oil-immersion type battery from the viewpoint of durability and conservation of environments. SOLUTION: This battery houses collective batteries consisting of plural single batteries 3, and has a battery housing tank 1 tightly closed by a cover 2, and has a pressure equalizing bladder 6 for compensating pressure differences between internal and external pressure by letting insulating oil 8 that is internally filled flow into the battery housing tank 1 or flow out of the battery housing tank 1 against the change of external pressure, and the pressure equalizing bladder 6 is made of metal bellows, and the gap between this metal bellows and battery housing tank 1 is sealed by O ring 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-immersed battery, and more particularly, to a main power supply for deep-sea equipment, a diving survey boat, a diving work robot, and the like, and instruments and communication equipment mounted thereon. The present invention relates to a structure of an oil-immersed battery which is used as an emergency power supply, and which compensates for a difference in pressure between inside and outside by flowing electrical insulating oil into or out of the battery storage tank in response to a change in external pressure.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for deep-sea equipment, diving survey vessels, diving work robots, and the like, with increasing diving depth and prolonging diving time. There is an increasing demand for large capacity batteries as emergency power supplies for communication devices.

[0003] Of the equipment mounted on the above-mentioned deep-sea equipment, diving survey boats, diving work robots, etc., batteries occupy 10 to 30% of the total drainage. Therefore, equipment other than batteries is housed in a pressure-resistant shell. Then, the battery is stored in a separately provided battery storage tank, and electric insulation oil flows into the battery storage tank or discharges the electric insulating oil from the battery storage tank in response to a change in external pressure to compensate for a pressure difference between the inside and the outside. , With an oil-immersed battery.

As shown in FIG. 2, such an oil-immersed battery is a battery in which a plurality of unit cells 3 are connected in series or in parallel to accommodate an assembled battery and a connector 4 for externally obtaining an output is provided. A storage tank 1 and an electric insulating oil 8 provided at a lower portion of the battery storage tank 1 and filled therein in response to a change in external pressure, flow into the battery storage tank 1 or flow out of the battery storage tank 1 so that the internal and external pressures are reduced. And a pressure equalizing bladder 6 for compensating for the difference. The battery storage tank 1 is closed at the top with a lid 2 provided with a gas vent plug 9 and at the bottom with a bottom plate 5 provided with an oil passage hole 11. It has a structure that is divided from the bladder 6.

In the oil-immersed battery described above, the bladder 6 for equalizing pressure is used.
Is a rubber-made device that can be easily moved with respect to changes in water pressure caused by diving and ascent of a deep-sea equipment, a diving research vessel, a diving work robot, etc., on which the cover 10 is provided. The cover 10 is used.
And the battery storage tank 1 are screwed together and connected to each other.

Accordingly, when a deep-sea equipment, a dive survey vessel, a dive work robot, or the like dive and the water pressure increases with the dive, the rubber pressure equalizing bladder 6 passes through the seawater flow hole 7 of the cover 10. The compressed electric insulating oil 8 is
Through the gas storage tank 1 to compress the gas in the battery storage tank 1, and the compressed gas is discharged to the outside through the vent plug 9, thereby compensating for the pressure difference between the inside and the outside with respect to the increase in water pressure. are doing. Also, when deep-sea equipment, submersible research vessels, diving work robots, etc. come up and the water pressure drops with this,
The gas in the battery storage tank 1 expands and the electric insulating oil 8 flows out of the battery storage tank 1 through the oil passage hole 6 to compensate for a pressure difference between the inside and the outside with respect to a decrease in water pressure.

[0007]

In the above-mentioned conventional oil-immersed battery, the pressure equalizing bladder 6 is made of rubber and is covered with a cover 10 provided with a seawater flow hole 7, so that the durability is improved. The problem is that the usable period must be determined in consideration of the problem, and after the usable period has elapsed, the entire rubber product must be replaced, requiring a lot of man-hours for replacement and a large amount of waste. there were.

[0008]

In order to solve the above-mentioned problems, an invention according to claim 1 includes a battery storage tank containing a plurality of unit cells connected in series or in parallel and sealed by a lid. An oil-immersed battery having a pressure equalizing bladder for compensating for an internal / external pressure difference by flowing an electric insulating oil filled in or flowing out of a battery storage tank against a change in external pressure to compensate for a pressure difference between the inside and outside. The equalizing bladder is made of a metal bellows, and the space between the metal bellows and the battery storage tank is sealed with an O-ring. Thus, an oil-immersed battery that can withstand use and reduce the amount of waste can be obtained.

According to a second aspect of the present invention, in the oil-immersed battery according to the first aspect, the material of the metal bellows is SU.
S316, SUS316L, stainless steel, nickel or nickel-copper alloy, Hastelloy-C-based alloy, and Inconel (625), which generate heat due to charging and discharging with a large current. However, stable internal and external pressure differences can be compensated.

According to a third aspect of the present invention, in the oil-immersed battery according to the first or second aspect, the material of the O-ring is Teflon. This is a liquid battery, and can prevent deterioration of the organic electrolyte even if the organic electrolyte scatters in a mist state.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIG. 1 is a sectional view of an oil-immersed battery according to an embodiment of the present invention.

A feature of the oil-immersed battery according to the embodiment of the present invention is that a battery storage tank 1 in which a plurality of unit cells 3 connected in series or in parallel is stored and a lid 2 is hermetically sealed.
The electric insulating oil provided in the lower part of the battery storage tank 1 and filled in response to a change in the external pressure flows into or out of the battery storage tank 1 to compensate for the pressure difference between the inside and the outside. And a pressure equalizing bladder 6 for
The equalizing bladder 6 is a metal bellows, and the space between the metal bellows and the battery storage tank 1 is sealed by an O-ring 12.

As the single cell 3, an organic electrolyte battery which requires a small number of cells to bring the voltage of the assembled battery to a predetermined value is often used, but in an assembled battery using such an organic electrolyte battery, It is premised that charging and discharging with a large current is performed, and it is indispensable that durability can be maintained even when heat generated by the charging and discharging and scattering of the organic electrolyte are present. Therefore, the material of the metal bellows of the equalizing bladder 6 is SUS31.
6, stainless steel such as SUS316L, nickel or nickel-copper alloy, Hastelloy-C-based alloy, and Inconel (625) are preferable, and the material of the O-ring 12 is preferably Teflon.

In the above-described embodiment, the pressure equalizing bladder 6 is used.
Is provided at the lower part of the battery storage tank 1, but may be provided at the side or the upper part of the battery storage tank 1.

[0016]

As described above, the oil-immersed battery of the present invention has
The equalizing bladder is made of metal bellows, and the space between the metal bellows and the battery storage tank is sealed with an O-ring, so that it can be used for a long time with simple work and the amount of waste is reduced. Therefore, it is possible to obtain an oil-immersed battery that is preferable in terms of durability and environmental protection, particularly an oil-immersed battery that is preferable when the unit cell is an organic electrolyte battery.

[Brief description of the drawings]

FIG. 1 is a sectional view of an oil-immersed battery according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional oil-immersed battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery storage tank 2 Lid 3 Single cell 6 Equalizing bladder 7 Seawater circulation hole 8 Electric insulating oil 9 Gas vent plug 11 Oil passage hole 12 O-ring

Claims (3)

[Claims] An assembled battery in which a plurality of unit cells are connected in series or in parallel is housed, and a battery housing tank sealed with a lid, and an electric insulating oil filled inside against a change in external pressure are filled in the battery housing tank. An oil-immersed battery having a pressure equalizing bladder for inflowing or flowing out of a battery storage tank to compensate for an internal and external pressure difference, wherein the pressure equalizing bladder is a metal bellows, and the metal bellows and the battery storage tank are An oil-immersed battery, wherein the space is sealed by an O-ring. 2. The oil-immersed battery according to claim 1, wherein the material of the metal bellows is stainless steel such as SUS316, SUS316L, nickel, or a nickel-copper alloy.
An oil-immersed battery comprising a Hastelloy-C-based alloy, Inconel (625). 3. The oil-immersed battery according to claim 1, wherein the material of the O-ring is Teflon.