JP2505851Y2 - Safety valve for Ni-Cd battery pack case - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a Ni-Cd battery pack case used for a portable wireless telephone device, etc.
In order to prevent the hydrogen gas generated when the i-Cd battery is charged from filling the inside of the case and increasing the internal pressure to explode, it is equipped with a safety valve body for allowing the hydrogen gas to escape and at the same time water from the outside. The present invention relates to a valve structure for preventing intrusion of air.

[0002]

2. Description of the Related Art Conventionally, N of this type of conventional device has been used.
The i-Cd battery pack case is not a hermetically sealed type, and a ventilation hole is provided in one inconspicuous place of the case, and hydrogen gas at the time of charging is released to the outside through this ventilation hole. Then, when the radio body and the Ni-Cd battery pack case are combined,
This vent hole was protected by the radio body side.

Therefore, if the Ni-Cd battery pack case is rapidly charged while being connected to the radio body, the Ni-Cd battery pack case is charged.
Since a large amount of hydrogen gas may be generated from the d battery to cause the above-described explosion, etc., it is unavoidable to perform long-time charging with a minute current instead of rapid charging, and as a result, charging requires a long time. There was an inconvenience.

As shown in FIG. 4, there is a safety valve body for releasing hydrogen gas, which is provided outside the case 1 as a cylindrical protrusion 2 as a spring accommodating portion.
The compression spring 3 is housed therein, the compression spring 3 is pressed by the pressing metal fitting 6, and the elastic force of the compression spring 3 presses the small hole 4 provided in the case 1 with the packing 5.

Therefore, such a valve structure has a large number of parts, which increases the number of manufacturing steps, resulting in high manufacturing cost. There is also a conventional example in which a special coating that allows passage of gas such as air and gas but does not allow passage of liquid such as water is used for the vent hole portion, but this kind of coating has the disadvantage of being expensive. It was

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and in order to achieve the above-mentioned object, in a sealed Ni-Cd battery pack case,
A vent hole provided in a part of the battery pack case for allowing gas to pass therethrough, a stepped recess provided in communication with the vent hole, and a safety valve body made of an elastic material mounted inside the step recess. It is characterized in that it comprises an exhaust groove communicating with the stepped recess and communicating with the outside, and a name plate for holding the safety valve body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to FIGS.
This will be described in detail with reference to FIG. A part of the Ni-Cd battery pack case 10 is provided with a circular vent hole 11 for venting hydrogen gas and a circular stepped recess 12 communicating with the vent hole 11. Further, the exhaust groove 13 communicates with the stepped recess 12.
Is provided, the hydrogen gas passing through the ventilation hole 11 is released to the outside through the exhaust groove 13.

In this stepped recess 12, as shown in FIG.
A safety valve body 14 preferably made of an elastic material such as silicone rubber is mounted. The safety valve body 14 includes a conical portion 14A, a flange portion 14B, and a pressing convex portion 14C. The outer surface of the Ni-Cd battery pack case 10 is provided with a shallow recess for attaching a nameplate as shown in FIG. 2, and the nameplate 15 is attached to the recess.

In FIG. 2, when the Ni-Cd battery is rapidly charged, the pressure inside the Ni-Cd battery pack case 10 rises, and the pressure is the conical portion 14A of the safety valve body 14.
Is pressed outward (to the right in the drawing), the safety valve 14
Since the pressing convex portion 14C of the above is in contact with the name plate 15, the safety valve body 14 does not move at a certain pressure and shuts off air and moisture from the outside.

However, when a pressure higher than a predetermined value is generated, the safety valve body 14 made of an elastic material loses the pressure and slightly moves to the outside, so that a gap is formed and hydrogen gas is discharged into the exhaust groove 13.
Is released to the outside through the. In this way an explosion due to an increase in the internal pressure can be prevented.

On the other hand, the Ni-Cd battery pack case is cooled in the winter season and the like, so that the internal pressure is lowered and therefore the safety valve body 14 is provided to prevent the safety valve body 14 from being sucked into the inside too much. And the flange portion 14B.

Vent hole 11, stepped recess 12, exhaust groove 13
Can be integrally formed with the Ni-Cd battery pack case by using, for example, a plastic material.

[0013]

According to the present invention described above, the waterproof and safety valve structure requires only two parts, a safety valve body made of an elastic material and a name plate, and therefore, the number of steps is also small in the assembling work. There is a remarkable practical effect that the manufacturing cost can be reduced. Further, since the ventilation holes are also arranged under the nameplate and are inconspicuous, it is very convenient in appearance. Not only is it convenient in appearance, but since the safety valve body and the ventilation hole are hidden under the nameplate, it can be protected from foreign matter and force from the outside and durability can be maintained.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a perspective view showing a safety valve body according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional safety valve body.

[Explanation of symbols]

 1, 11 Pack case 12 Stepped recess 13 Exhaust groove 14 Safety valve disc 15 Name plate

Claims (3)

(57) [Scope of utility model registration request] 1. A hermetically sealed Ni-Cd battery pack case, a vent hole provided in a part of the battery pack case for allowing gas to pass therethrough, and a stepped recess provided in communication with the vent hole. A safety valve body made of an elastic material mounted inside the stepped recess, an exhaust groove communicating with the stepped recess and communicating with the outside, and a name plate for holding the safety valve. Safety valve for Ni-Cd battery pack case. 2. The presser member according to claim 1, wherein the safety valve body has a conical portion for engaging with the vent hole, a flange portion provided at a bottom portion of the conical portion, and the name plate. And a safety valve for a Ni-Cd battery pack case. 3. The air vent, the stepped recess, and the exhaust groove are formed integrally with the Ni—Cd battery pack case using a plastic material, for example. Safety valve for Ni-Cd battery pack case.