JPS6020280Y2 - Explosion-proof sealed battery - Google Patents

Description

[Detailed description of the device] This device ruptures a part of the battery's sealing gasket when the internal pressure of the battery increases abnormally, and releases the abnormal gas pressure to the outside from the ruptured part, causing an explosion. This relates to an explosion-proof battery designed to prevent the danger of explosion.

The structure of this type of explosion-proof battery is, for example, USP34
As described in the 1569 specification, when the sealing gasket bulges outward due to an increase in the internal pressure of the battery, a member having a sharp blade is fixed in the direction of this bulge, and the tip of the blade bulges upward. Conventionally, a structure is known that causes a sealing gasket that comes into contact to burst.

However, with such a structure, it is relatively troublesome to form a member with a sharp blade, and during assembly, care must be taken to avoid the sealing gasket and the blade touching each other. It was a hassle.

This invention has been devised to eliminate such troubles, and its configuration will be explained below with reference to an embodiment shown in the drawings.

In FIG. 1, the sealed battery shown here also has an open end of an anode inner case 1 sealed with a sealing gasket body 2 which is a molded product of synthetic resin, and a current collector rod 10 is inserted into the sealing gasket body 2. A boss part 3 having a through hole and an annular outer cylinder part 4 are connected by a conical thin connecting part 5, and an annular step part 6 formed on the inner wall of this annular outer cylinder part 4 has an outer circumferential curve. Cathode terminal plate 7 in the shape of a truncated cone with portion 8 as a part of the bottom surface.
The outer circumferential curved portion 8 is fitted, and the metal current collector rod 10 welded to the center of the back surface of the cathode terminal plate 7 is fitted into the through hole 9 provided at the center of the sealing gasket body boss portion 3.

The above-mentioned emerging structure has no difference from the conventional one.

However, in this invention, the metal ring 11 (see FIG. 2), which is formed by punching out a metal plate and forming an inwardly sharp triangular protrusion 12, 12', is first fitted into the annular step 6. , then the cathode terminal plate 7 is placed on this metal ring 11.
The structure is different from the conventional structure in that the outer peripheral curved portion 8 of the metal ring 11 is accommodated, and the triangular protruding portion 12,12' of the metal ring 11 faces the conical thin connecting portion 5 of the sealing gasket body 1 at an appropriate distance.

After the metal ring 11 and cathode terminal plate 7 are placed in order in the annular step 6 as described above, the opening edge of the anode inner case 1 is bent inward, and the metal case 1, sealing gasket body 2, and metal A unit cell is completed in which the ring 11 and the cathode terminal plate 7 are combined.

To make an explosion-proof sealed battery from this unit cell, the unit cell body is wrapped with an electrically insulating heat-shrinkable film 13, and the free end of the metal outer can 14 provided through the film 13 is inserted into the metal interior. As in case 1, the inside is curved.

By doing so, the annular backing 16 fitted in order to close the gas vent hole 15 provided on the side wall surface of the cathode terminal plate 7 from the outside is evenly crimped, thereby completing an explosion-proof sealed battery.

In other words, this invention seals the open end of the anode inner case 1 with a sealing gasket body 2 in which a boss part 3 having a penetration part into which the current collector rod 10 is inserted and an annular outer cylinder part 4 are connected by a conical thin-walled connecting part 5. In the battery, a metal ring 11 is fitted into an annular step 6 formed on the inner wall of the annular outer cylindrical portion 4, and the cathode terminal plate is shaped like a truncated cone with the annular step 6 and outer circumferential curved portion 8 forming part of the bottom surface. A triangular protrusion 12.12' formed inwardly on the inner circumferential edge of the metal ring 11 and sandwiched by the outer circumferential curved portion 8 of the metal ring 11 is inserted into the space formed by the sealing gasket body 2 and the cathode terminal plate 7. The sealing gasket body 2 faces the conical thin connecting portion 5 of the sealing gasket body 2 at an appropriate distance.

Since this invention has the above-described structure, the metal ring 11 having the triangular protrusions 12 and 12' formed on the inner peripheral edge is extremely easy to manufacture by punching a metal plate, and this metal ring 11 can be attached to the sealing gasket body 2. The sharp triangular projections 12 and 12 of the metal ring 11 fit into the annular stepped portion 6 formed on the inner wall of the annular outer cylinder portion 4.
'There is no risk of damaging the conical thin connecting portion 5 of the sealing gasket body 2.

Moreover, this triangular protrusion 12.12' is located within the space formed by the sealing gasket body 2 and the cathode terminal plate 7, and faces the conical thin connection portion 5 of the sealing gasket body 2 at an appropriate distance. As a result, the conical thin connecting portion 5 swells toward the triangular protrusions 12, 12' due to the rise in internal pressure of the battery, and finally causes the triangular protrusions 12, 12' to burst, causing the gas pressure to rise. The annular backing 16 is pushed away from the gas vent hole 15 and the gas is discharged to the outside, thereby ensuring an explosion-proof function.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the main parts of the battery of the present invention, FIG. 2 is a perspective view of the metal ring, and FIG. 3 is a diagram illustrating the sealing part assembly operation. DESCRIPTION OF SYMBOLS 1...Anode inner case, 2...Sealing gasket body, 3...Boss part, 4...Annular outer cylinder part, 5...One conical shape Thin connection part, 6... Annular step part, 7... Cathode terminal plate, 8... Outer circumference curved part, 11... Metal ring, 12.12 '
・・・・・・Triangular protrusion.

Claims (1)

[Scope of utility model registration request] The open end of the anode inner case 1 is sealed by a sealing gasket body 2 in which a base portion 3 having a through hole 9 into which a current collector rod 10 is inserted and an annular outer cylinder portion 4 are connected by a conical thin connection portion 5. Therefore, a metal ring 11 is fitted into the annular step 6 formed on the inner wall of the annular outer cylinder 4 to form a truncated cone shape with the annular step 6 and the outer circumferential curved portion 8 as part of the bottom surface, and to vent gas. Hole 1
The sealing gasket body 2 is sandwiched between the curved outer circumferential portion 8 of the cathode terminal plate 7 provided with a triangular protrusion 12.12' formed inward on the inner circumferential edge of the metal ring 11.
An explosion-proof sealed battery is disposed in a space formed by a cathode terminal plate 7 and a conical thin connection part 5 of a sealing gasket body 2, and is opposed to the conical thin connection part 5 of a sealing gasket body 2 at an appropriate distance.