JPH043396Y2 - - Google Patents

Description

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

[Problem that the invention attempts to solve]

Recently, various electronic devices are rapidly becoming less power consuming and have longer lifespans, and the electrolyte batteries used in these devices are required to maintain stable performance over a long period of time. Generally, in this type of battery, the internal pressure (inside the can) increases abnormally and there is a risk that the entire battery may be destroyed.

[Means for solving problems]

In view of the above points, the present invention consists of a rupture disc that bulges and deforms due to an increase in pressure, using a plating membrane, in order to prevent the destruction of pressure-sealed containers such as electrolyte batteries. A pressure relief device is provided which includes a protrusion on the outside of the membrane that ruptures the plating membrane.

[Function] The pressure safety relief device is installed, for example, in the sealing part of the electrolyte battery, and uses projections to pierce the plating film that expands and deforms as the internal sealing pressure increases, thereby releasing the pressure. The pressure can be released quickly by taking advantage of the membrane's good crack propagation properties.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

In the electrode terminal 1 of the electrolyte battery shown in FIG.
A space 4 is formed inside, and a through hole 5 and a ventilation hole 6 are bored to communicate with the space 4. A plating film 7 functioning as a rupture plate is airtightly sandwiched between the terminal body 2 and the cap 3 so as to be in contact with the upper surface of the terminal body 2. A sharp projection 8 is integrally provided on the lower surface of the top plate of the cap 3 and projects toward the plating film 7.

The electrode terminal 1 is airtightly attached to an electrode can (not shown) by inserting the lower end of the terminal body 2 into the can, and the through hole 5 partitioned by the plating film 7 is inserted into the can. The space 4 communicates with the atmosphere through the vent hole 6. If the pressure inside the can suddenly increases from this normal state for some reason, the pressure immediately acts on the plating film 7 through the through hole 5, causing the plating film 7 to bulge upward as shown in FIG. The protrusion 8 ruptures it so that the pressure is released in the direction of the arrow.

The plating film 7 is formed into a disk shape with a thickness of about 50 μm by electrolytic plating or electroless plating, and has excellent crack propagation properties as seen from the results of the comparative test below. Along with this, a large amount of pressure can be released quickly.

In other words, in this comparative test, the electrode terminal 1 equipped with the plating film 7 and the same thickness instead of the plating film 7 were used.
Prepare an electrode terminal equipped with 50μm rolled metal foil,
Both terminals are connected to a test device 9 as shown in FIG.
A hydraulic pressurization test was conducted by incorporating the As a result of the test, the water pressure of the example product equipped with the plated membrane 7 was
When the pressure reached 50 kg/cm ² G, the plating membrane 7 ruptured and water spouted out vigorously. On the other hand, a comparative product equipped with rolled metal foil ruptured under a water pressure of 65 kg/cm ² G, but only a smear of water leaked out. After the test, we compared the rupture conditions of both cases and found that Fig. 4A
The example product shown in Figure B had larger rupture holes 10 than the comparative product shown in Figure B, and a plurality of cracks 11 were also observed. The difference between the two is that the plating film 7 forms a layered structure and exhibits directionality, so crack propagation is good, whereas the rolled material is anisotropic, so cracks do not propagate easily. Subsequently, it was confirmed that, like rolled metal foil, rolled metal plates and resin sheets also have poor crack propagation properties.

[Effect of idea]

As explained above, the pressure safety relief device of the present invention includes a rupture disc that bulges and deforms due to an increase in pressure, which is made of a plating film, and is equipped with a protrusion on the outside of the plating film that ruptures the plating film. For example, when this is assembled into the sealing part of the electrode terminal, destruction of the entire battery can be prevented even if the pressure inside the battery becomes abnormally high. Since the rupture of the mesh membrane is caused by forcibly breaking through it with the protrusion, it is possible to provide a highly reliable device that operates reliably when the pressure reaches the set value, and also provides a highly reliable device.
Once it ruptures, the crack widens, allowing a large amount of pressure to escape quickly.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the normal state of the electrode terminal that constitutes the pressure safety relief device according to the embodiment of the present invention, Fig. 2 is a cross-sectional view showing the operating state, and Fig. 3 is the electrode terminal assembled into the test device. The sectional view of the state and FIGS. 4A and 4B are enlarged views of the ruptured portion. 1... Electrode terminal, 2... Terminal body, 3... Cap, 4... Space, 5... Through hole, 6... Ventilation hole, 7... Plating film, 8... Protrusion, 9... Test device , 10...Rupture hole, 11...Crack.

Claims (1)

[Scope of utility model registration request] A pressure safety relief device characterized in that a rupture disc that expands and deforms due to an increase in pressure is made of a plating film, and a protrusion that ruptures the plating film is provided on the outside of the plating film.