JPH059599Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure safety relief device for dealing with an excessive increase in the internal pressure of a sealed container such as an electrolyte battery.

[Conventional technology]

In recent years, various electronic devices have rapidly become lower in power consumption and have longer lifespans, and the electrolyte batteries used in these devices are required to maintain stable performance over a long period of time. However, in this type of battery, if the internal pressure rises abnormally for some reason, such as an increase in ambient temperature, there is a risk that the entire battery will be destroyed.

For this reason, as shown in FIG. 2, the inner lumen of the container 3 is
Rupture disc 1 with grooves 2 formed in part by pressing
When the internal pressure of the container 3 rises beyond a predetermined limit, the rupture disc 1 ruptures along the groove 2 to release the pressure to the outside, thereby preventing the risk of explosion. There is something I did.

[Problem that the invention attempts to solve]

However, the groove 2 formed by press molding
However, due to wear of the press die, etc., the thickness of the groove bottom 2' varies, which causes the pressure value at the time of breakage to become unstable, resulting in low reliability. The depreciation costs for the press molds used for molding were also high.

In view of the above problems, the present invention aims to improve the reliability of rupture discs and reduce manufacturing costs.

[Means for solving problems]

In other words, the present invention seals the inner cavity of a container with a rupture disc in which a groove is formed, and when the internal pressure of the container rises beyond a predetermined limit, the pressure at which the rupture disc ruptures along the groove is reduced. In the safety relief device, the groove includes a slit formed through the rupture disc body, a metal foil located on one side of the rupture disc body and sealing the slit, and the metal foil and the rupture disc body. The gist is that the plating film is formed across the surface of the plate.

[Effect]

According to the above configuration, the groove bottom of the concave groove of the rupture disc is formed by spanning the metal foil that seals the slit formed through the rupture disc body, and the surface of the metal foil and the rupture disc body. Since the metal foil and the plating film are made of the same thickness and material, the strength of the groove bottom is made constant;
Variations in performance are minimized.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments.

In FIG. 1, reference numeral 11 denotes a rupture disc whose lid is welded to the opening of the container 13 in order to seal the inner cavity of the container 13. and a container 13 of the main body 11a.
A metal foil 11b with a wall thickness of 5μ attached to the surface facing the inner cavity, and this metal foil 11b and the rupture disc main body 1.
Plating film 11c formed across the surface of 1a
It becomes more. Reference numeral 12 denotes a concave groove which is a part where rupture occurs when the internal pressure of the container 13 rises abnormally, and is pre-pierced in the center of the rupture disc main body 11a in a substantially C-shape in plan by press punching or laser fusing. It consists of the formed slit 12a, and the metal foil 11b and plating film 11c as the groove bottom 12b which exist so as to close the slit 12a.

According to this configuration, the groove bottom 12b of the groove 12 is
The material and wall thickness are constant, and since the rupture disc main body 11a and the metal foil 11b are joined by the plating film 11c, by appropriately selecting the material and film thickness of the plating film 11c, the container can be It is possible to make it possible to determine to what extent the pressure of the rupture disc 13 increases before the groove 12 of the rupture disc 11 is ruptured and the pressure is released, that is, the allowable pressure value of the rupture disc 11 can be made constant.

[Effect of idea]

As explained above, in the pressure safety relief device of the present invention, the concave groove provided in the rupture disc is not formed by press rolling as in the conventional method, but is formed by forming a groove through a slit formed through the rupture disc body. The metal foil is formed by a plating film that is bonded to the rupture disc main body, and the strength of the groove bottom is made constant, so variations in performance are almost eliminated and a highly reliable product can be provided. . Furthermore, since there is no need to incur the depreciation cost of press dies unlike in the past, it is also possible to reduce manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing a conventional structure. 11...Rupture disc, 11a...Rupture disc body, 11
b...Metal foil, 11c...Plated film, 12...Concave groove, 12a...Slit, 12b...Groove bottom, 13
……container.

Claims (1)

[Scope of utility model registration request] A pressure safety relief device in which the inner cavity of a container is sealed with a rupture disc having a groove formed in a part thereof, and the rupture disc ruptures along the groove when the internal pressure of the container rises beyond a predetermined limit, a slit in which the groove passes through the rupture disc body; a metal foil located on one side of the rupture disc body and sealing the slit;
A pressure safety relief device comprising the metal foil and a plating film formed across the surface of the rupture disc body.