JPH0355248Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to a safety valve device for a battery that releases gas inside the battery generated in an abnormality into the atmosphere.

(b) Conventional technology As one of the battery safety valve devices,
As seen in Publication No. 19330, by providing a cylindrical body with a bottom, the bottom of the thin elastic membrane is brought into close contact with a lid plate having a valve hole, and the inside of the battery is always sealed, thereby preventing the internal pressure of the battery from decreasing due to an internal short circuit, etc. It is known that when the battery rises, the thin bottom of the bottomed cylindrical body is reliably bent and destroyed by a cutting blade or gas pressure, thereby releasing the gas inside the battery into the atmosphere.

When using such a battery with a safety valve device, for example, as a memory backup power source for electronic equipment, a connecting lead piece is welded to the battery in advance, and this connecting lead piece is automatically attached to a printed circuit board that incorporates an electronic circuit. The battery is attached by soldering to the board, or by fitting it into a connecting lead piece provided on the printed circuit board.

Usually, as shown in FIG. 5, such a connecting lead piece L is attached in advance by the battery manufacturer in a shape that does not block the gas vent hole H of the battery E, or the connecting lead piece L is attached in advance by the battery manufacturer. is supplied to There is no problem if the user uses such a dedicated lead terminal, but if the dedicated lead terminal cannot be used, or if the user is not familiar with the functions of the safety valve device and simply makes the electrical connection. If a plate-shaped connecting lead piece L is used as shown in Fig. 6, it will fit into the gas vent hole H.
There was a risk that the gas generated during an abnormality would not be released to the outside of the battery and the battery would be destroyed.

(c) Problems that the invention aims to solve This invention was developed to greatly reduce the risk of battery destruction as described above, and to ensure that the gas generated in the battery during an abnormality is released into the atmosphere. The object of the present invention is to provide a highly safe safety valve device for batteries that can be discharged.

(d) Means for solving the problem The present invention consists of a lid plate provided with a valve hole, a plate-shaped terminal plate formed by cutting and raising the bottom surface facing the lid body, and having a gas vent hole. Inside the valve chamber that is formed,
In the battery safety valve device, a bottomed cylindrical body having a flange sandwiched between the lid plate and the dish-shaped terminal plate and a bottom formed in the form of an elastic thin film that constantly closes the valve hole is interposed. A second gas vent hole is provided on the bottom edge or outer circumferential side of the shaped terminal plate, and a notch is provided in the upper part of the cylindrical wall of the bottomed cylindrical body facing the second gas vent hole. It is something.

(E) Effect Even if the first gas vent hole is blocked by the attachment of the connecting lead piece, there is a second gas vent hole, so in the event of an abnormality, the elastic thin film bottom of the bottomed cylindrical body will bend due to an increase in battery internal pressure. , the battery is destroyed by the cutting edge or gas pressure, and the gas inside the battery is released into the atmosphere through the valve hole, the notch in the upper part of the cylinder wall, and the second gas vent hole.
Destruction of the battery is prevented.

(f) Examples Examples of the present invention will be described below based on the drawings.

FIG. 1 shows the end structure of a battery according to an embodiment of the present invention. In the figure, a battery safety valve device 1 is provided in a valve chamber 4 formed by a lid plate 2, a dish-shaped terminal plate 3 in the shape of an upside down plate, and the lid plate 2 and the dish-shaped terminal plate 3. The plate-shaped terminal plate 3 is caulked and attached by a bent portion 21 of the cover plate 2.

A valve hole 22 is bored in the center of the lid plate 2. On the other hand, in the center of the dish-shaped terminal plate 3, a cutting edge 31 and a first gas vent hole 32 shown in the top view of FIG. ing. Furthermore, a plurality of second gas vent holes 33 are formed in the bottom edge of the dish-shaped terminal plate 3.

As shown in the perspective view of FIG. 3, the bottomed cylindrical body 5 is made of an elastic material such as polypropylene resin and has a bottom 51 formed in a membrane shape, and further has a flange 52 on its outer periphery. is formed and held between the lid plate 2 and the dish-shaped terminal plate 3. Further, at the upper end of the cylindrical wall 53 of the bottomed cylindrical body 5, a plurality of notches 54 and an annular stepped portion 55 are formed opposite to the second gas vent hole 33 provided in the dish-shaped terminal plate 3. A gas passage is formed.

Furthermore, the battery safety valve device 1 constructed in this way is airtightly and liquid-tightly attached to the opening of the outer can 7 into which the electrode group 6 is inserted through the insulating packing 8, thereby forming the battery end. There is.

In this way, by providing a plurality of second gas vent holes 33 on the bottom edge of the dish-shaped terminal plate 3, the first gas vent holes 32 can be unintentionally opened using the plate-shaped connection lead piece 10 shown by the dashed line. Even if you block the second
Some of the gas vent holes 33 are not blocked.

Therefore, even if an abnormality such as a short circuit occurs inside the battery at this time, the bottom part 51 will bend upward due to the generated gas and be destroyed by the cutting blade 31, as shown in FIG. , the gas flows through the valve hole 22, the valve chamber 4,
The gas is discharged into the atmosphere from the second gas vent hole 33 through the notch portion 54 and the stepped portion 55 . By this,
Battery safety is ensured.

Note that the second gas vent hole is not limited to the bottom edge of the dish-shaped terminal plate 3, but can also be provided on the outer peripheral side surface of the dish-shaped terminal plate 3 that is in contact with the atmosphere.

(g) Effects of the invention As described above, according to the invention, in addition to taking advantage of the advantages of conventional safety valve devices, it is possible to prevent the function from stopping due to blockage of the gas vent caused by external factors by simply installing a second gas vent. An extremely reliable safety valve device for a battery is obtained which can prevent the gas inside the battery by releasing the gas into the atmosphere. In addition, according to the present invention, there is no need to use a dedicated connection lead piece, and there is no need to use a dedicated connection lead piece, and there is no need to worry about the trouble of proceeding with the work while being careful not to block the gas hole as in the past when performing connection work such as soldering the lead piece. This eliminates the problem and greatly improves work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a battery safety valve device according to an embodiment of the present invention, FIG. 2 is a plan view of the battery safety valve device of FIG. 1, and FIG. 3 is an enlarged perspective view of a bottomed cylindrical body.
FIG. 4 is a cross-sectional view for explaining the operation of the battery safety valve device in the event of a battery abnormality, and FIG. 5 is an explanatory diagram of the attached state of a dedicated connection lead piece used in a conventional battery.
FIG. 6 is an explanatory diagram when a plate-shaped connection lead piece is connected to a conventional battery. 1... Battery safety valve device, 2... Lid plate, 3...
Dish-shaped terminal plate, 4... Valve chamber, 5... Bottomed cylindrical body, 6
... Electrode group, 7 ... Exterior can, 8 ... Insulating packing, 10 ... Connection lead piece, 21 ... Bending part, 2
2... Valve hole, 31... Cutting edge, 32, 33... Gas vent hole, 51... Bottom, 52... Flange edge, 53... Cylinder wall, 54... Notch, 55... Step portion.

Claims (1)

[Claims for Utility Model Registration] (1) A valve formed by a cover plate with a valve hole, a cutting blade formed by cutting and raising the bottom surface facing the valve hole, and a dish-shaped terminal plate having a gas vent hole. In the battery safety valve device, a bottomed cylindrical body having a flange sandwiched between the lid plate and the dish-shaped terminal plate and a bottom portion of an elastic thin film that closes the valve hole is interposed in the chamber. A battery characterized in that a second gas vent hole is provided on the bottom edge or outer circumferential side of the terminal plate, and a gas passageway is provided in the upper part of the cylindrical wall of the bottomed cylindrical body facing the second gas vent hole. safety valve device. (2) Utility model registration Claim 1, characterized in that a gas passage is formed by an annular stepped portion and a plurality of notches provided on the upper outer periphery of the cylinder wall of the bottomed cylindrical body. Safety valve device for batteries.