JPH10247482A - Battery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery device having the high-reliability protection/safety function at a low cost by proving a thin section at one portion of a vertical face to the expanding/shrinking direction of a bellows expansion/shrinkage section, and providing protrusion having the height reaching the thin section when the bellows expansion/shrinkage section is extended at the position facing the thin section of a member installed with a battery. SOLUTION: In this battery 1 storing a power generating element, the pressure equalizing device 2 of a bellows expansion/shrinkage section is liquid-tightly and airtightly connected to the battery 1, and an electrolyte is stored in the battery 1. A stainless thin film 2a having the thickness of 100μm is provided on the end face of the bellows expansion/shrinkage section. A battery storage box 3 stores six batteries 1 each having the pressure equalizing device 2, and it is communicated wit the outside by a communicating port 3c. The bottom plate 3a of the battery storage box 3 is provided with protrusions 3b having sharp tips at the positions facing the thin films 2a, and each protrusion 3b cuts open the thin film 2a to relieve the internal pressure when the internal pressure abnormally increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery device as a power supply for driving equipment used under high pressure such as deep sea.

[0002]

2. Description of the Related Art As is well known, since a high pressure is applied in the deep sea, a battery provided with a so-called equalizing device is employed instead of relying on the pressure resistance of the battery case alone. Not used. The battery case containing the power generation element and the pressure equalizing device are air-tightly and liquid-tightly integrated, and the inside of both is filled with an electrolyte and communicates with each other. When the pressure of the environment in which the battery is installed increases, the volume of the pressure equalizing device shrinks, and the internal pressure becomes the same as the external pressure, thereby preventing the battery case and the pressure equalizing device from being damaged.

[0003]

On the other hand, it is assumed that a battery or a charger for charging the battery breaks down. One of the symptoms is that the internal pressure rises due to overcharging or short-circuiting of the power generating element, and in the worst case, the battery or pressure equalizer ruptures, causing damage to the equipment installed in the vicinity. Therefore, a safety valve that opens at a predetermined pressure is provided in the battery or the pressure equalizing device to prevent the battery case and the pressure equalizing device from being damaged. The safety valve used for such a purpose is required to have a high reliability to operate stably for a long period of time, so that a very expensive one is employed.

Further, bellows having a small spring constant are used in order to minimize the pressure difference between the inside and outside of the battery. For this reason, when an abnormality occurs in the battery and the internal pressure of the battery rises, the bellows first extend to a position where it hits the inner wall of the battery storage box, and then the pressure in the unit cell rises, and the safety valve operates to release the internal pressure. At this time, a large force according to the following formula is applied to the portion of the battery storage box where the bellows hits.

[0005] (cell force applied to the storage box) = (effective bottom area ¬ ² of bellows) × (the safety valve operation pressure ¬ / ¬ ² · f) × (bellows number = cell number) Thus, the battery storage box and a battery It is necessary to make the members to be installed robust, and as a countermeasure in case the safety valve does not operate, these members are made more robust,
Not only are they expensive, but volume and weight efficiencies are sacrificed.

[0006]

In view of the above, a pressure equalizing device comprising an electrolyte container having a bellows-type expansion / contraction part is attached to a battery case having a power generation element built therein. In a battery configured to move between the device and the battery case, a thin portion is provided on at least a part of a vertical surface with respect to a direction of expansion and contraction of the bellows expansion and contraction portion,
The problem is solved by providing a battery device in which a protrusion having a height reaching the thin portion when the bellows elastic portion is extended is provided at a position facing the thin portion of a member for installing a battery. It is something to try.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

The function according to the present invention is to cut off a part of the bellows expansion and contraction part when an abnormality occurs in the battery, the internal pressure rises above a predetermined value, and the bellows expansion and contraction part reaches the maximum extension. It releases internal pressure and prevents rupture of batteries and pressure equalizers.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 denotes a battery having a built-in power generating element. Reference numeral 2 denotes a bellows-type expansion / contraction section pressure equalizer.
Fluid-tightly and airtightly, and contains an electrolyte therein. 2a is an end face of the bellows-type expansion / contraction part and has a thickness of 1
It is a thin film made of stainless steel of 00 μm. Reference numeral 3 denotes a battery storage box, which stores six batteries with a pressure equalizing device in the embodiment, and is connected to the outside by a communication port 3c. The bottom plate 3a of the battery storage box 3 is provided with a projection 3b having a sharp tip at a position facing the thin film 2a.

In actual use, a battery in a battery storage box configured as shown in FIG. 1 is mounted on a deep sea and connected to a load device (not shown). When it is located at normal pressure, that is, on the interface, it is not subjected to external pressure, but as it dive, the pressure in the boat increases and the pressure in the battery storage box also increases. The bellows of the pressure equalizer shrinks in proportion to the pressure rise, the pressure inside the battery rises, and the pressure inside and outside the battery becomes uniform, preventing the battery from being crushed.

If an abnormality occurs in the charger or the battery and the internal pressure of the battery rises abnormally, the bellows of the pressure equalizer expands, and the end face contacts the projection 3b of the bottom plate of the battery storage box. The thin film 2a is opened to release the internal pressure of the battery, thereby preventing the battery from bursting.

[0012]

As described in detail above, by using the battery device according to the present invention, a battery device having highly reliable protection and safety functions can be obtained at low cost, and in addition, weight efficiency and volume Extremely high industrial value that allows for improved efficiency.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Bellows type expansion / contraction device 2a Thin film 3 Battery storage box 3a Battery storage box bottom plate 3b Sharp projection 3c Communication port

Claims (1)

[Claims] 1. A pressure equalizing device comprising an electrolyte container having a bellows-type expansion / contraction portion is attached to a battery case having a power generation element built therein. And a battery configured to move
A thin portion is provided on at least a part of a vertical surface with respect to the direction of expansion and contraction of the bellows elastic portion, and a height of reaching the thin portion when the bellows elastic portion is extended at a position facing the thin portion of a member for installing a battery. A battery device comprising a projection.