JP2003217532A - Sealing gasket for alkaline battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid rupture of a sealing gasket for an alkaline battery caused by abnormal inner pressure due to misuse of the alkaline battery. <P>SOLUTION: Around a boss part 61 of a cylindrical shape is formed a thin safety valve 62, around which 62, a buffer ring 65 of a cross section U-shape is formed with a coupling part 63 interposed. A periphery edge part 66 is formed around the buffer ring 65, and a ventilating part 61a is formed at an outer periphery of the boss part 61 so as to be positioned outside the safety valve 62. A plurality of ribs 64 are set in protrusion at a negative electrode terminal 3 side of the coupling part 63, and a plurality of ventilating grooves 65a are formed at the buffer ring 65. With this, a gap between a breaking part of the safety valve 62 and the boss part 61 is widened enough when the safety valve 62 is broken with the inner pressure rise of the alkaline battery 1 and the coupling part 63 is deformed in a direction of the inner pressure, so that gas is vented through the ventilating grooves 65a even if the ribs 64 stop to get in contact with the negative electrode terminal 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin sealing gasket interposed between a positive electrode can and a negative electrode terminal of an alkaline battery, that is, a sealing gasket for an alkaline battery.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing an alkaline battery in which an example of a conventional sealing gasket is assembled, and FIG. 5 is a half sectional view showing an operating state of a safety valve of the sealing gasket shown in FIG.

In the conventional sealing gasket 6 of this type, as shown in FIG. 4, in order to avoid rupture due to abnormal internal pressure due to misuse of the alkaline battery 1, boss portion 61
A thin safety valve 62 is formed in the periphery of the buffer ring 6 so that the abnormal internal pressure can be released, and further, a buffer ring 6 having a U-shaped cross section so that the safety valve 62 is not stressed when the alkaline battery 1 is assembled.
5 is often provided.

When the internal pressure of the alkaline battery 1 rises and reaches a predetermined pressure, the safety valve 62 of the sealing gasket 6 is broken, as shown in FIGS. Since 63 is deformed in the internal pressure direction, a mechanism is provided to release gas from the gap between the safety valve 62 and the boss portion 61 to release the internal pressure.

[0005]

However, this has the following disadvantages.

First, even if the safety valve 62 breaks, the boss portion 6
In addition to the narrow gap between the safety valve 62 and the boss portion 61, the broken portion of the safety valve 62 moves along the outer periphery of the boss portion 61 even if the connecting portion 63 deforms in the internal pressure direction. Since the gap between and does not widen so much, the gas in the alkaline battery 1 cannot sufficiently escape.

Second, the connecting portion 63 is finally connected to the negative electrode terminal 2
Since it comes into contact with and stops at this portion, the escape of gas is hindered also in this portion, and there is a possibility that the release of the internal pressure is delayed and the alkaline battery 1 bursts especially when the gas flow rate is high.

In view of such circumstances, the present invention is for an alkaline battery capable of sufficiently releasing gas, and at the same time, capable of immediately releasing an abnormal internal pressure even when the gas flow rate is large to avoid rupture. The purpose is to provide a sealing gasket.

[0009]

First, the invention according to claim 1 of the present invention is a positive electrode can (2) of an alkaline battery (1).
A sealing gasket (6) interposed between a negative electrode terminal (3) and a negative electrode terminal (3), having a cylindrical boss (61), and forming a thin safety valve (62) around the boss. A sealing gasket having a U-shaped buffer ring (65) formed around the safety valve via a connecting part (63), and a peripheral edge part (66) formed around the buffer ring. A ventilation part (61a) is formed outside the safety valve, and a plurality of ribs (6) are formed on the connecting part.
4) is provided so as to project toward the negative electrode terminal side, and a plurality of ventilation grooves (65a) are formed in the buffer ring. here,
As a typical method of forming the ventilation portion on the outer periphery of the boss portion, it is considered that the diameter of the boss portion is partially reduced.

By adopting such a structure, when the safety valve breaks due to an increase in the internal pressure of the alkaline battery and the connecting portion is deformed in the internal pressure direction, the gap between the break portion of the safety valve and the boss portion is sufficiently widened, and the rib has a negative electrode. It works so that even if it comes into contact with the terminal and stops, the gas will come out of the ventilation groove without stagnation.

In the invention according to claim 2 of the present invention, the installation interval of the ribs (64) is set to the ventilation groove (65).
It is configured to be smaller than the width of a). With this structure, the gas does not have to bypass the ribs and the gas passing through the ventilation groove.

In the invention according to claim 3 of the present invention, the rib (64) and the ventilation groove (65a) are arranged on the same straight line in the radial direction.

In the invention according to claim 4 of the present invention, the rib (64) and the ventilation groove (65a) are arranged on mutually different straight lines in the radial direction.

Further, in the invention according to claim 5 of the present invention, a part of the rib (64) and a part of the ventilation groove (65).
and a) are arranged on the same straight line in the radial direction, and the remaining ribs and the remaining ventilation grooves are arranged on different straight lines in the radial direction.

Note that the reference numerals in parentheses are for convenience of representing corresponding elements in the drawings, and therefore the present invention is not limited to the description in the drawings. This also applies to the "Claims" section.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an example of an alkaline battery in which a sealing gasket according to the present invention is assembled, FIG. 2 is a perspective view showing three embodiments of the sealing gasket according to the present invention, and FIG. 3 is a sealing gasket shown in FIG. FIG. 6 is a half sectional view showing an operating state of the safety valve of FIG.

As shown in FIG. 1, the sealing gasket 6 according to the present invention is interposed between the positive electrode can 2 and the negative electrode terminal 3 of the alkaline battery 1 and is attached to the collector rod 5. It has a cylindrical boss portion 61. A thin safety valve 62 is formed around the entire circumference of the boss portion 61, and a buffer ring 65 having a U-shaped cross section is formed around the safety valve 62 via a disc-shaped connecting portion 63. Further, around the buffer ring 65, a peripheral edge portion 66 for caulking and holding the negative electrode terminal 3 together with the positive electrode can 2 is formed.

On the outer circumference of the boss portion 61, a ventilation portion 61a is formed so as to be positioned outside the safety valve 62 (on the side of the negative electrode terminal 3) due to the partial diameter reduction, and at the connecting portion 63, As shown in FIG. 2A, six ribs 6
4 are projected on the negative electrode terminal 2 side at equal angular intervals (60 ° intervals) on the circumference. Further, in the buffer ring 65, six ventilation grooves 65a are formed on the circumference at equal angular intervals (intervals of 60 °). Here, the rib 64 and the ventilation groove 65a are arranged on the same straight line in the radial direction, and the installation interval of the rib 64 is smaller than the width of the ventilation groove 65a.

Since the sealing gasket 6 has the above-mentioned structure, when the internal pressure of the alkaline battery 1 rises to reach a predetermined pressure, as shown in FIGS. 3 (a) to 3 (c),
Since the safety valve 62 of the sealing gasket 6 breaks and the connecting portion 63 deforms in the internal pressure direction, gas escapes from the gap between the safety valve 62 and the boss portion 61 to release the internal pressure. At this time, the gap between the ruptured portion of the safety valve 62 and the boss portion 61 is sufficiently widened, and even if each rib 64 abuts on the negative electrode terminal and stops, the gas is released from the ventilation groove 65a without any delay. Therefore,
It is possible to avoid rupture due to abnormal internal pressure due to misuse of the alkaline battery 1, and it is possible to provide the alkaline battery 1 with high safety.

In the embodiment described above, FIG.
Although the sealing gasket 6 in which the rib 64 and the ventilation groove 65a are arranged on the same straight line in the radial direction as shown in (a) has been described, as shown in FIG. May be arranged on different straight lines in the radial direction. Alternatively, as shown in FIG.
By reducing the number of 4 to 4, some ribs 64 and some ventilation grooves 65a are arranged on the same straight line in the radial direction, and the remaining ribs 64 and the remaining ventilation grooves 65a are in the radial direction. It is also possible to arrange them on different straight lines.

[0021]

As described above, according to the inventions according to claims 1 to 5 of the present invention, when the safety valve ruptures due to the increase in the internal pressure of the alkaline battery and the connecting portion is deformed in the internal pressure direction, the safety valve ruptures. The gap between the boss and the boss is sufficiently widened, and even if the rib comes into contact with the negative electrode terminal and stops, the gas escapes from the ventilation groove without delay, so that the gas can be sufficiently escaped and at the same time the gas flow rate is high. Even if, however, it is possible to provide a sealing gasket for an alkaline battery, which can immediately release an abnormal internal pressure and avoid a rupture.

Further, according to the second aspect of the present invention, the gas does not have to bypass when passing between the ribs and through the ventilation groove, so that the gas can be more smoothly released and the alkali The safety of using the battery is further increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an alkaline battery in which a sealing gasket according to the present invention is assembled.

FIG. 2 is a perspective view showing three embodiments of a sealing gasket according to the present invention.

FIG. 3 is a half sectional view showing an operating state of a safety valve of the sealing gasket shown in FIG.

FIG. 4 is a cross-sectional view showing an alkaline battery in which an example of a conventional sealing gasket is assembled.

5 is a half sectional view showing an operating state of a safety valve of the sealing gasket shown in FIG.

[Explanation of symbols]

1 ... Alkaline battery 2 ... Positive electrode can 3 ... Negative electrode terminal 6 ... Sealing gasket 61 ... Boss 61a ... Ventilation part 62 ... Safety valve 63 ... Connection part 64 ... rib 65 ... Buffer ring 65a ... Ventilation groove 66 ... fringe

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiro Harada             F-de, 5-36-1 Shimbashi, Minato-ku, Tokyo             K.K Co., Ltd. F term (reference) 5H011 AA13 FF02 GG02 HH02 JJ04                       KK01                 5H012 AA01 BB04 CC06 DD05 DD11                       DD17 EE01 FF01 GG01 JJ01

Claims (5)

[Claims] 1. A sealing gasket (6) interposed between a positive electrode can (2) and a negative electrode terminal (3) of an alkaline battery (1).
Which has a cylindrical boss portion (61), a thin safety valve (62) is formed around the boss portion, and a buffer having a U-shaped cross section is formed around the safety valve via a connecting portion (63). In a sealing gasket having a ring (65) and a peripheral portion (66) formed around the buffer ring, a ventilation portion (61a) is formed on the outer periphery of the boss portion so as to be located outside the safety valve, A sealing gasket for an alkaline battery, wherein a plurality of ribs (64) are provided on the connection portion so as to protrude toward the negative electrode terminal, and a plurality of ventilation grooves (65a) are formed in the buffer ring. 2. The installation interval of the ribs (64) is set to the ventilation groove (65).
The sealing gasket for an alkaline battery according to claim 1, wherein the sealing gasket has a width smaller than that of a). 3. The rib (64) and the ventilation groove (65a) are arranged on the same straight line in the radial direction.
Alternatively, the sealing gasket for the alkaline battery according to claim 2. 4. The sealing gasket for an alkaline battery according to claim 1, wherein the rib (64) and the ventilation groove (65a) are arranged on straight lines different from each other in a radial direction. 5. Some ribs (64) and some ventilation grooves (6)
5a) are arranged on the same straight line in the radial direction, and the remaining ribs and the remaining ventilation grooves are arranged on mutually different straight lines in the radial direction.
Sealing gasket for alkaline batteries described in.