JP2001307691A - Oil-immersed-type battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-immersed-type battery that enables to easily assemble and transport the battery. SOLUTION: This oil-immersed-type battery comprises a battery-housing case 11 in which a collective battery composed of plural nonaqueous-electrolyte batteries 10A is housed and which is closed up tight with a cover 19, and a pressure-equalizing bladder 12 for compensating the pressure difference between the inside and the outside by causing the insulating oil 21 filled inside to flow into the battery-housing case 11 and flow out of the battery-housing case in accordance with the variations of the external pressure. In the nonaqueous- electrolyte battery 10A, a pressure-averaging device 10A-2 attached to a battery case 10A-1 has a protective cover 10A-3, and this protective cover 10A-3 has an opening 10A-31 for causing the insulating oil to flow into the gap between the protective cover and the pressure-averaging device and flow out of the gap between the protective cover and the pressure-averaging device in accordance with the variations of the external pressure.

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. Used as a power source for
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-immersed battery that compensates for a pressure difference between an inside and an outside by flowing electric insulating oil into or out of a battery storage tank in response to a change in external pressure.

[0002]

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

[0003] In response to the above demands, batteries for deep-sea equipment, diving survey boats, diving work robots, and the like store the equipment because the battery occupies 10 to 30% of the total drainage of the equipment mounted thereon. A battery storage tank is provided separately from the pressure-resistant shell for storing batteries in the battery storage tank, and electric insulating oil flows into or out of the battery storage tank in response to a change in external pressure. An oil-immersed battery that compensates for a pressure difference between the inside and outside has been used.

FIG. 5 shows an example of the above-mentioned oil-immersed battery. That is, what is shown in FIG. 5 is a battery storage tank 11 in which a plurality of batteries 10 are stored, and the battery storage tank 1
A pressure equalizing bladder 12 provided at a lower portion of the battery pack 1 and adapted to flow into or out of the battery storage tank 11 to compensate for a pressure difference between the inside and the outside by the electric insulating oil 21 filled therein with respect to a change in external pressure. A bladder cover 16 enclosing the pressure equalizing bladder 12, the upper part of the battery storage tank 11 is sealed with a lid 19 provided with a gas vent plug 20, and the lower part on which the battery 10 is mounted is formed with an oil passage hole 13; Pressure equalizer 1 with bottom plate 14 provided with
2 and the bladder cover 16 is provided with a seawater circulation hole 18.
And a structure in which the battery storage tank 11 and the pressure equalizing device 12 are connected by bolts 15 inserted into the upper flange portion 17.

[0005] When the deep-sea equipment, a dive survey boat, a dive work robot, or the like, on which the oil-immersed type battery is mounted receives high water pressure during diving, the bladder for equalizing the bladder through a seawater circulation hole 18 of the bladder cover 16. 12 is compressed, the electric insulating oil 21 moves into the battery storage tank 11 through the oil passage hole 13,
The gas remaining in the battery storage tank 11 is compressed, and the compressed gas is discharged to the outside through the gas vent plug 20. When the water pressure received by the floating rises, the gas in the battery storage tank 11 expands. As a result, the electric insulation oil 21 flows out of the battery storage tank 11 through the oil passage 13 to compensate for the pressure difference between the inside and outside.

A battery 1 used for such an oil-immersed battery
No. 0 has conventionally used an aqueous electrolytic solution such as dilute sulfuric acid or potassium hydroxide as the electrolytic solution. However, the diving depth of deep-sea equipment equipped with an oil-immersed battery, a diving survey ship, a diving work robot, etc. In order to meet the demands for deepening the water and increasing the dive time, it is necessary to increase the number of batteries 10 to be mounted, and the battery storage tank 1, lid 9 and cover 6 also endure the weight and water pressure of the batteries. , And the weight is increased.

However, in recent years, a non-aqueous electrolyte battery using a non-aqueous electrolyte as an electrolyte, which has a high energy density per unit weight and is used as the battery 10 for the oil-immersed battery, has been receiving attention. It has become possible to increase the capacity of an oil-immersed battery without increasing its weight.

[0008]

If the above-described non-aqueous electrolyte battery is to be used for the oil-immersed battery having the above-described structure, since the battery has a sealed structure, a pressure equalizing device is attached to the battery case. A non-aqueous electrolyte must be circulated between the battery case and the pressure equalizer to compensate for the pressure difference between the inside and the outside. In some cases, the pressure equalizer may be destroyed by the impact of the battery, and a complicated procedure such as using a jig to protect the pressure equalizer when assembling or transporting the battery is required. Was.

[0009]

According to a first aspect of the present invention, there is provided a battery in which a plurality of nonaqueous electrolyte batteries connected in series or in parallel are housed and sealed by a lid. An oil-immersed battery having a storage tank and a pressure equalizing bladder for compensating for a pressure difference between the inside and the outside by injecting or discharging electric insulating oil filled in the battery storage tank in response to a change in external pressure. In the non-aqueous electrolyte battery, a battery pressure equalizing device is attached to a battery case, and a protective cover for protecting the pressure equalizing device is provided. An opening is provided to allow the electric insulating oil to flow in between the protective cover and the pressure equalizing device or to flow out from between the protective cover and the pressure equalizing device. Through the battery case inside and outside It is characterized by a structure that compensates for the pressure difference, so that the battery can be placed upright without using a jig to protect the pressure equalizing device when assembling the battery. The battery can be easily assembled and transported.

[0010] According to a second aspect of the present invention, in the oil-immersed battery according to the first aspect, the non-aqueous electrolyte battery is provided for allowing the non-aqueous electrolyte to flow between the battery case and the pressure equalizer. It is characterized by having a maze-shaped flow path portion, whereby even if the active material falls off from the electrode in the battery case, the active material is captured by the maze-shaped flow path portion, so It does not penetrate into the pressure equalizing device, and it is possible to prevent the malfunction of the pressure equalizing device and the occurrence of the opening.

According to a third aspect of the present invention, in the oil-immersed battery according to the first or second aspect, the non-aqueous electrolyte battery comprises:
A cotton-like or sponge-like object is housed in the pressure equalizing device, so that even if the active material falls off from the electrode in the battery case, the cotton-like or sponge-like object is removed. Since it is trapped by the object, it does not enter the pressure equalizing device, and it is possible to prevent the pressure equalizing device from malfunctioning or opening.

[0012]

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

FIG. 1 is a cross-sectional view of an oil-immersed battery according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a non-aqueous electrolyte battery housed in the first embodiment of the oil-immersed battery. Parts having the same functions as those in FIG. 5 are denoted by the same reference numerals, and the following description is omitted.

The feature of the oil-immersed battery according to the embodiment of the present invention is, as shown in FIG. 1, a plurality of non-aqueous electrolyte batteries 10A.
Are connected in series or in parallel, and a battery storage tank 11 sealed with a lid 19 and an electric insulating oil 21 filled inside against a change in external pressure.
1 and a bladder cover 16 for covering the pressure equalizing bladder 12 for compensating for a pressure difference between the inside and the outside by flowing into or out of the battery storage tank 11. The feature of the non-aqueous electrolyte battery 10A is that, as shown in FIG.
A-2 is attached, and the pressure equalizing device 10A-2
A protective cover 10A-3 is provided to protect the electric power from flowing into the protective cover 10A-3 between the protective cover 10A-3 and the pressure equalizer 10A-2 with respect to a change in external pressure. An opening 10A- for flowing out from between the pressure equalizing device 10A-2 and the protective cover 10A-3.
31 is provided.

If the nonaqueous electrolyte battery 10A has a cylindrical shape, the openings 10A-31 may be provided at least at one position on the bottom surface and at one position on the side surface of the protective cover 10A-3.
If it is a square shape, it is preferable to provide at least one location on the bottom surface and one location on each side surface. However, the protective cover 10A-3 may be formed in a lattice shape, and the space between the lattices may function as an opening.

The material of the protective cover 10A-3 is preferably made of a metal such as stainless steel or a resin such as Teflon, which is strong enough to support the nonaqueous electrolyte battery 10A.

The pressure equalizer 10A-2 is a bellows made of metal such as stainless steel, and the bellows expands and contracts due to a change in external pressure so that a pressure difference between the inside and the outside can be compensated. is there.

FIG. 3 is a cross-sectional view of a non-aqueous electrolyte battery housed in the second embodiment of the present invention, and portions having the same functions as those in FIG. 2 are denoted by the same reference numerals.

That is, the one shown in FIG. 3 has a labyrinthine flow path portion 10A-4 for flowing the non-aqueous electrolyte 3 between the battery case 10A-1 and the pressure equalizer 10A-2. The active material that has fallen from the electrode group is captured by the flow path portion 10A-4, and is prevented from entering the pressure equalizer 10A-2, This is to prevent operation failure and opening from occurring in the pressure equalizing device 10A-2.

The shape of the above-mentioned labyrinthine flow path portion 10A-4 may be other than the shape shown in FIG.

FIG. 4 is a cross-sectional view of a non-aqueous electrolyte battery housed in the third embodiment of the present invention, and portions having the same functions as those in FIG. 2 are denoted by the same reference numerals.

That is, what is shown in FIG. 4 is a cotton-like or sponge-like object 10A-
5 in which the active material dropped from the pole group is captured by the cotton-like or sponge-like object 10A-5. Even if it invades, it does not reach the inner wall surface of the pressure equalizing device 10A-2 to prevent malfunction and opening.

The cotton-like or sponge-like object 10A
-5 is preferably made of polypropylene, Teflon (registered trademark), glass, ceramics, or the like, which can be easily processed into a cotton or fiber shape, or a material, such as fluororesin, which can be easily processed into a sponge shape. However, it is not limited to such a material.

In the non-aqueous electrolyte batteries shown in FIGS. 2, 3 and 4, the pressure equalizer 10A-2 is connected to the battery case 10A-.
1 is provided below the battery case 10 as needed.
It can be provided on the upper part or side part of A-1.

[0025]

As described above, the oil-immersed battery of the present invention has
A protective cover is provided on the pressure equalizer of the non-aqueous electrolyte battery stored in the battery storage tank, so that the battery can be easily assembled and transported, and the active material falls off from the electrode group in the battery case. However, since it is not trapped by the labyrinth-like flow path or the cotton-like or sponge-like object to cause the opening of the pressure equalizer, it can also contribute to the improvement of reliability and safety. it can.

[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 sectional view of a nonaqueous electrolyte battery housed in the first embodiment of the oil-immersed battery.

FIG. 3 is a cross-sectional view of a non-aqueous electrolyte battery housed in a second embodiment of the oil-immersed battery.

FIG. 4 is a sectional view of a non-aqueous electrolyte battery housed in the third embodiment of the oil-immersed battery.

FIG. 5 is a cross-sectional view of a conventional oil-immersed battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collective battery 10A Non-aqueous electrolyte battery 11 Battery storage tank 12 Equalizing bladder 16 Bladder cover 10A-1 Battery case 10A-2 Equalizing device 10A-3 Protective cover 10A-31 Opening 10A-4 Channel part 10A-5 Cotton Object or sponge-like object

Claims (3)

[Claims] 1. A battery storage tank in which a plurality of non-aqueous electrolyte batteries connected in series or in parallel are stored, and a battery storage tank sealed by a lid, and an electric insulating oil filled inside against a change in external pressure. An oil-immersed battery having a pressure equalizing bladder for inflowing into or out of the storage tank and compensating for a pressure difference between the inside and outside of the battery storage tank, wherein the nonaqueous electrolyte battery includes a battery case having a pressure equalizing device. A protective cover for protecting the pressure equalizing device is provided, and the protective cover is provided with a protective cover for injecting or protecting the electric insulating oil between the protective cover and the pressure equalizing device against a change in external pressure. An opening for flowing out from between the cover and the pressure equalizing device is provided, a non-aqueous electrolyte is circulated between the pressure equalizing device and the inside of the battery case, and the pressure difference between the inside and outside of the battery case is compensated. An oil-immersed battery characterized in that: 2. The non-aqueous electrolyte battery according to claim 1, wherein the non-aqueous electrolyte battery has a maze-shaped flow path portion for flowing the non-aqueous electrolyte between the battery case and the pressure equalizer. An oil-immersed battery characterized in that: 3. A non-aqueous electrolyte battery according to claim 1, wherein the non-aqueous electrolyte battery contains a cotton-like object or a sponge-like object in a pressure equalizing device. .