JPH10208726A - Electric current shut off apparatus and battery having the apparatus built-in - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable and small sized electric current shut off apparatus which can surely shut off electric current even in the case not only pressure but also temperature and electric current exceed prescribed values. SOLUTION: A diaphragm part 2a which is inversely turned and shuts overcurrent preventing fuse 4 by pushing a cutting blade plate 6 to the fuse when the pressure exceeds a prescribed value is installed in a side face of an electric current shut off apparatus main body 2 in whose inside the excess electric current preventing fuse 4 is housed and at the same time a resin plate 7 containing a thermally expansive foaming agent which is foamed and expanded when the temperature exceeds a prescribed value to push the cutting blade plate 6 to cut the excess electric current preventing fuse 4 is installed inside the electric current shut off apparatus main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current interrupting device for securing a battery or the like by interrupting the current when an excessive current flows or an abnormal rise in pressure or temperature, and a built-in current interrupting device. Battery.

[0002]

2. Description of the Related Art In recent years, a camera-integrated video or portable CD has been developed.
With the spread of portable electronic devices such as players and mobile phones,
There is a growing demand for small, high-capacity sealed batteries. In such a sealed battery, if a short circuit is erroneously generated on the load side during discharging, a large short circuit current flows and the inside of the battery generates abnormal heat. When such abnormal heat is generated, not only does the gas inside the battery thermally expand, but also the electrolyte evaporates and gas is generated by chemical decomposition, so that the temperature and pressure rise significantly and the battery ruptures. The danger occurs. Further, in the case of a secondary battery, when the battery is overcharged during charging, the internal pressure increases due to the decomposition of the electrolytic solution and heat is generated due to the decomposition reaction, causing the same danger.

Therefore, a conventional sealed battery is, for example, shown in FIG.
A safety device as shown in FIG. This safety device is provided on a battery cover 18 attached to an upper end opening of a battery container 13 that houses the power generation element 12 via an insulating gasket 17. The battery cover 18 has a convex dish-shaped terminal plate 18b fixed on a cover plate 18a, and a valve body 19 and a cutting blade 20 are arranged in the dish-shaped terminal plate 18b. The valve body 19 is an elastic body in which a thin portion 19a is formed by recessing the central portion, and the gas pressure in the battery container 13 is applied to the lower surface of the thin portion 19a through an opening hole in the central portion of the cover plate 18a. It has become. The cutting blade 20 is fixed above the thin portion 19a of the valve body 19 with the cutting edge directed downward. A gas vent hole 18c is formed at the center of the dish-shaped terminal plate 18b. Therefore, when the gas pressure in the battery container 13 becomes abnormally high, the thin portion 19a of the valve body 19
Swells upward and is pressed against the cutting edge of the cutting blade 20 to break the gas.
By being released to the outside through 8c, the battery can be prevented from exploding.

In some cases, a conventional sealed battery is provided with a safety device as shown in FIG. This safety device includes a battery cover 18 serving as a positive electrode terminal of the battery and a lead plate 15 pulled out from the positive electrode of the power generating element 12. The battery cover 18 is formed by fixing a concave thin plate valve plate 18d below the convex dish-shaped terminal plate 18b.
Is attached to the upper end opening of the first through an insulating gasket 17. The valve plate 18d has a thin portion 18e having a particularly small thickness at the center. Lead plate 15
Is drawn out to below the valve plate 18d via an insulating stripper 21. And this lead plate 15
The upwardly projecting portion is welded to the lower surface of the thin portion 18e of the valve plate 18d through a connection hole provided in the stripper 21. Therefore, when the gas pressure in the battery container 13 becomes abnormally high, the central portion of the valve plate 18d is depressed upward, and the lead plate 15 blocked by the stripper 21 is peeled off by the thin portion 18e, so that the charge / discharge current is interrupted. By stopping the heat generation, the rupture of the battery can be prevented.

Further, the applicant of the present invention has disclosed a charge / discharge lead in which a conductive layer such as a copper thin film is printed on a brittle base material such as ceramic.
There has also been proposed a safety device capable of reliably interrupting the charge / discharge current by breaking the battery by pressure-sensitive means for permanently projecting the protrusion by reverse deformation when the pressure in the battery becomes high (Japanese Patent Application No. Hei 6 (1994) -294). -60115).

[0006]

However, in the conventional safety device shown in FIG. 6, the pressure in the battery can be prevented from rising due to the breakage of the valve element 19, but the temperature rises because the charge / discharge current continues to flow. There has been a problem that the rise continues and that the battery cannot be prevented from being at an abnormally high temperature, and the generation of gas due to chemical decomposition of the electrolyte or the like cannot be stopped.

On the other hand, in the conventional safety device shown in FIG. 7, when the lead plate 15 is peeled off from the valve plate 18d, the charging / discharging current is interrupted. Can be prevented from rising. However, even if the battery is charged and discharged with an excessive current that greatly exceeds the rated current, the safety device does not function unless the final phase of heat generation and internal pressure rise is reached, so the battery may be used in a potentially dangerous state. Become.

[0008] These problems are not limited to the above-mentioned sealed battery, but are common to equipment in which the internal pressure and temperature may be abnormally increased due to the continuous flow of current.

The present invention has been made in view of the above circumstances, and has a highly reliable and small size capable of reliably shutting off not only pressure but also temperature and current in the event of an abnormality. It is intended to provide a current interrupt device.

[0010]

In order to solve the above-mentioned problems, the present invention provides (1) a pressure-sensitive current interrupting means for interrupting a conductive path when an ambient pressure exceeds a predetermined value; A temperature-sensitive current interrupting means for interrupting the conductive path when the temperature exceeds a predetermined value.

According to the means of (1), by inserting the current interrupting device into the current path of the device, when the pressure inside the device exceeds a predetermined value, the pressure-sensitive current interrupting device cuts the conductive path. In addition to shutting down, the temperature-sensitive current interrupting means shuts off the conduction path when the temperature inside the device exceeds a predetermined value, so that if any of the pressure or temperature inside the device becomes abnormal, the current is reliably Can be shut off. Further, since the pressure-sensitive current interrupting means and the temperature-sensitive current interrupting means share the interrupting portion of the conductive path, the current interrupting device can be downsized.

(2) a conductive path comprising an overcurrent preventing fuse which blows when the current exceeds a predetermined value or a conductive path including the overcurrent preventing fuse; and a conductive path which cuts off when the ambient temperature exceeds a predetermined value. And a temperature-responsive current interrupting means.

According to the means of (2), by inserting the current interrupting device into the current path of the device, the temperature-sensitive current interrupting device cuts the conductive path when the temperature inside the device exceeds a predetermined value. The overcurrent protection fuse is blown when the current in the current path exceeds a predetermined value, as well as when the current is interrupted. Can be. In addition, since the temperature-sensitive current interrupting means interrupts the overcurrent prevention fuse or the conductive paths before and after the fuse, the current interrupting device can be miniaturized by using a common interrupting portion.

Further, (3) a conductive path formed of an overcurrent preventing fuse which blows when the current exceeds a predetermined value or a conductive path including the overcurrent preventing fuse, and a conductive path cut off when the surrounding pressure exceeds a predetermined value. And a temperature-sensitive current interrupting means for interrupting the conductive path when the ambient temperature exceeds a predetermined value.

According to the means (3), by inserting the current interrupting device into the current path of the device, when the pressure inside the device exceeds a predetermined value, the pressure-sensitive current interrupting device cuts the conductive path. In addition to the interruption, the temperature-sensitive current interruption means interrupts the conduction path when the temperature inside the device exceeds a predetermined value, and the overcurrent prevention fuse is blown when the current in the current path exceeds the predetermined value. Therefore, when any one of the pressure, temperature, and current inside the device becomes abnormal, the current can be reliably cut off. Further, since the pressure-sensitive current interrupting means and the temperature-sensitive current interrupting means interrupt the overcurrent prevention fuse or the conductive path before and after the fuse, the interrupting section can be shared and the current interrupting device can be miniaturized.

Further, (4) a conductive path comprising an overcurrent preventing fuse which blows when the current exceeds a predetermined value or a conductive path including the overcurrent preventing fuse, and a conductive path when the surrounding pressure exceeds a predetermined value. And pressure-sensitive current interrupting means for interrupting the current.

According to the means of (4), by inserting the current interrupting device into the current path of the equipment, when the pressure inside the equipment exceeds a predetermined value, the pressure-sensitive current interrupting means cuts the conductive path. In addition to shutting off, the overcurrent protection fuse is blown when the current in the current path exceeds a predetermined value, so make sure to shut off the current if either the internal pressure or the current becomes abnormal. Can be. Further, since the pressure-sensitive current interrupting means interrupts the overcurrent preventing fuse or the conductive paths before and after the fuse, the interrupting portion can be shared and the current interrupting device can be downsized.

(5) The pressure-sensitive current interrupting means of (1), (3) and (4) is a snap-action type pressure-sensitive diaphragm which is depressed inward when a pressure exceeding a predetermined value is received. The conductive path is cut off when it is depressed inward.

According to the means of (5), when the ambient pressure exceeds a predetermined value, the pressure-sensitive diaphragm of the pressure-sensitive current interrupting means can be depressed inward to reliably cut off the conductive path to interrupt the current. it can. Further, even if the surrounding pressure subsequently decreases, the once cut conductive path is not recovered, so that it is safe.

As shown in a later embodiment, a cutting blade for cutting the conductive path may be fixed to the inner surface of the diaphragm. Further, the cutting blade may be provided integrally with the inner surface of the diaphragm.

(6) The pressure-sensitive current interrupting means of (1), (3) to (5), wherein the conductive path is interrupted when the surrounding pressure becomes 5 kgf / cm ² or more. And

(7) The temperature-sensitive current interrupting means of (1) to (3), (5) and (6) further comprises: a heat-expandable resin body which expands and expands when the temperature exceeds a predetermined value; When the thermally expandable resin body expands, the conductive path is pressed and cut.

According to the means (7), when the temperature exceeds a predetermined value, the heat-expandable resin body of the temperature-sensitive current interrupting means expands and breaks the conductive path to cut off the current. be able to. Further, even if the temperature subsequently decreases, the disconnected state of the conductive path is not recovered, so that it is safe.

A cutting blade for cutting the conductive path can also be used for the temperature-sensitive current interrupting means. Also, when using a cutting blade for the pressure-sensitive current interrupting means,
These cutting blades can be shared.

(8) The temperature-sensitive current interrupting means of (1), (3) to (5), and (7) interrupts the conductive path when the ambient temperature becomes 130 ° C. or more. It is characterized by.

(9) The overcurrent protection fuse of (2) to (8) blows when a current of 5 A or more flows.

(10) The current interrupting device of (1) to (9) is characterized by comprising a container mainly made of stainless steel.

According to the means (10), the current interrupting device is housed in a container made of stainless steel having high corrosion resistance, so that it can be used even in an electrolytic solution.

(11) The current interruption device according to any one of (1) to (10) is inserted in a current path of a charge / discharge current in a battery case of a secondary battery.

According to the means (11), the current interrupting device can be used as a safety device for preventing a danger when the secondary battery is short-circuited or overcharged.

(12) The current interruption device according to any one of (1) to (10) is inserted in a current path of a charge / discharge current in a battery case of a primary battery.

According to the means (12), the current interrupting device can be used as a safety device for preventing a danger when the primary battery is short-circuited.

[0033]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing the structure of a current interrupting device, FIG. 2 is an overall perspective view of the current interrupting device, and FIG. FIG. 4 is a diagram showing the internal configuration of a secondary battery using the current interrupting device, FIG. 4 is a longitudinal sectional view showing the internal state of the current interrupting device when the temperature exceeds a predetermined value, and FIG. It is a longitudinal cross-sectional view which shows the internal state of the current interrupting device in the case where it is set. Components having the same functions as those of the conventional example shown in FIGS. 6 and 7 are denoted by the same reference numerals.

In this embodiment, a current interrupting device used as a safety device for a secondary battery will be described. As shown in FIG. 2, the current interrupting device 1 is housed in an approximately elliptical cylindrical current interrupting device main body 2 having a major axis of about 3 mm and a length of about 20 mm, and is drawn out from both ends of the current interrupting device main body 2. Lines 3, 3 have been drawn. As shown in FIGS. 1 and 2, the current interrupting device main body 2 is an elliptic cylinder made of a stainless steel plate, and has a diaphragm portion 2a formed by projecting a central portion of a side surface facing upward into a trapezoidal cross section. Diaphragm part 2
In the case of a, the thickness of the protruding peripheral portion is reduced, and the snap action operation is performed by the elasticity of the stainless steel plate on the peripheral portion. That is, when the surrounding pressure increases, 5 k
The diaphragm 2a is kept in a protruding state up to the pressure of gf / cm ² , but when the pressure becomes 5 kgf / cm ² or more, the peripheral portion is suddenly reversed and the diaphragm 2a is recessed inside the current interrupting device main body 2. I get stuck. However, even if the surrounding pressure returns to less than 5 kgf / cm ² , the diaphragm portion 2 may not move due to the hysteresis characteristic of the snap action.
The depressed state of a is maintained. When the surrounding pressure becomes negative compared to the inside, the diaphragm portion 2a projects again, but when the current interrupting device 1 is used for a secondary battery, the surrounding does not become negative.

As shown in FIG. 1, an overcurrent prevention fuse 4 that is blown when a current of 5 A or more flows is disposed in the current interrupting device main body 2. Then, conductive leads 3, 3 are connected to both ends of the overcurrent prevention fuse 4, and are drawn out from both ends of the current interrupter main body 2. Both ends of the current interrupting device main body 2 are resin-sealed with sealants 5 and 5.

A cutting blade plate 6 having a cutting edge directed downward to the overcurrent prevention fuse 4 is fixed to the inner surface (lower surface in the figure) of the diaphragm portion 2a in the current interrupting device main body 2. The cutting blade plate 6 is provided with a blade on the lower surface of an insulating ceramic or resin plate material, and the downward blade is formed wider than the width of the overcurrent prevention fuse 4.
Further, a resin plate 7 containing a thermally expandable foaming agent is arranged on a side (lower side in the figure) of the overcurrent prevention fuse 4 in the current interrupting device main body 2 opposite to the cutting blade plate 6. The heat-expandable foaming agent-containing resin plate 7 is a plate made of a resin containing a foaming agent that generates a gas by a chemical reaction at a temperature of 130 ° C. or more, and foams when the foaming agent generates a gas. The plate thickness expands several times to several tens times.

As shown in FIG. 3, the current interrupting device 1 comprises a positive electrode of a power generating element 12 of a secondary battery 11 and a battery container 13.
Lead plate 1 for connecting to positive electrode terminal 14 provided in
The lead wires 3, 3 are connected in the middle of 5 and inserted. In addition,
The current interrupting device 1 may of course be inserted in the middle of the lead plate 15 that connects between the negative electrode of the power generating element 12 and the negative electrode terminal 16 provided on the battery case 13.

The current interrupting device 1 having the above-described configuration includes a rechargeable battery 1
The positive terminal 14 and the negative terminal 16 are short-circuited externally and
When a short-circuit current of A or more flows, the overcurrent prevention fuse 4 is blown to cut off the short-circuit current. Therefore, the secondary battery 1
In No. 1, since the short-circuit current is quickly cut off, the temperature and pressure inside the battery do not rise.

When the secondary battery 11 is overcharged during charging and the temperature inside the battery becomes 130 ° C. or higher,
When discharging, a large discharge current of about 5A flows for a long time,
Or, a discharge current of 5 A or more flowed, but the overcurrent prevention fuse 4 did not blow due to any abnormality,
If the temperature inside the battery rises above 130 ° C,
The thermally expandable foaming agent-containing resin plate 7 starts foaming and expanding. Then, as shown in FIG. 4, the foamed and expanded thermally expandable foaming agent-containing resin plate 7 lifts the overcurrent prevention fuse 4 and presses it against the upper cutting blade plate 6, so that the overcurrent prevention fuse 4 is cut off. The charge / discharge current is cut off. Therefore, in the secondary battery 11, the charging current and the large discharging current (short-circuit current) at the time of overcharging are immediately cut off, and the temperature and pressure inside the battery decrease. Moreover, the temperature inside the battery is 130 ° C
Even if the temperature is reduced to less than 2, since the foaming expansion of the thermally expandable foaming agent-containing resin plate 7 is maintained, the cutoff of the overcurrent prevention fuse 4 is maintained.

Further, under the same circumstances, the temperature inside the battery rises to near 130 ° C., or this temperature rises to 1 ° C.
Although the temperature rose to 30 ° C. or higher, the pressure inside the battery became 5 kgf / cm ² or more because the overcurrent prevention fuse 4 was not cut due to foaming expansion of the thermally expandable foaming agent-containing resin plate 7 due to some abnormality. When it rises, the diaphragm portion 2a is depressed inward. Then, as shown in FIG. 5, the diaphragm portion 2a which is depressed inward presses the cutting blade plate 6 against the overcurrent preventing fuse 4, so that the overcurrent preventing fuse 4 is cut off and the charging / discharging current is cut off. Therefore, in the secondary battery 11, the charging current and the large discharging current (short-circuit current) at the time of overcharging are immediately cut off, and the temperature and pressure inside the battery decrease. Moreover, the pressure inside the battery is 5
Even if it falls below kgf / cm ² , the diaphragm portion 2a
Remains depressed, so that the overcurrent prevention fuse 4 is kept cut.

The internal pressure of the battery was 5 kgf / c
m ² or more has been increased, some if such disconnection of overcurrent prevention fuse 4 by the diaphragm portion 2a is not performed by the abnormal temperature of the battery is 130 ° C
As a result, the overexpandable fuse 4 is cut off. Even if the temperature inside the battery rises to 130 ° C. or more, the resin plate 7 containing the heat-expandable foaming agent may be damaged by some abnormality.
When the discharge current (short-circuit current) becomes 5 A or more, the overcurrent prevention fuse 4 is blown even when the overcurrent prevention fuse 4 is not cut off due to the foam expansion.

Therefore, the current interrupting device 1 of the present embodiment is
If a large short-circuit current flows through the secondary battery 11 or the temperature or pressure inside the battery abnormally rises due to this short-circuit accident or overcharging during charging, any abnormality of these current, temperature and pressure is detected. As a result, the charging / discharging current can be reliably shut off, and thus a highly reliable safety device can be obtained. Also,
The thermally expandable foaming agent-containing resin plate 7 and the diaphragm portion 2a
Even if the temperature and the pressure decrease, the cutting state of the overcurrent prevention fuse 4 can be reliably maintained. Further, since the resin plate 7 containing the expandable foaming agent and the diaphragm portion 2a share the cutting blade plate 6 and cut the fuse 4 for preventing overcurrent, the current interrupting device 1 is compactly housed in the current interrupting device main body 2. And the space in the secondary battery 11 is not unnecessarily occupied. Furthermore, by forming the current interrupting device main body 2 from a stainless steel plate having good corrosion resistance, there is no danger that the electrolyte of the secondary battery 11 enters the inside, and the inside can be protected stably even at high temperatures.

In the above-described embodiment, the cutting blade plate 6 is used to cut the overcurrent prevention fuse 4. However, the cutting blade plate 6 is omitted, and the insulated inner surface of the diaphragm portion 2a and the expanded foam are expanded. The overcurrent prevention fuse 4 can be cut by crushing or the like by the resin plate 7 containing the thermally expandable foaming agent itself. In the above embodiment, the overcurrent prevention fuse 4 is cut to cut off the charging / discharging current. However, the conductors before and after the overcurrent prevention fuse 4 in the current interrupting device main body 2 are cut. It may be.

Further, in the above-described embodiment, the charge / discharge current is cut off when any of the current, temperature and pressure abnormalities is detected, but either the heat-expandable foaming agent-containing resin plate 7 or the diaphragm 2a is disconnected. Omit, either current or temperature,
Alternatively, the charging / discharging current may be cut off only when an abnormality of either the current or the pressure is detected. Further, the overcurrent protection fuse 4 is replaced with a conductor having no overcurrent protection function, and only when an abnormality of either temperature or pressure is detected, the charge / discharge current is cut off by cutting the conductor. It may be.

Further, as long as the fuse 4 and the conductor can be cut off in response to temperature and pressure, the resin plate 7 and the diaphragm portion 2a containing the thermally expandable foaming agent used in the above embodiment are not limited. Instead, any temperature-sensitive current interrupting means or pressure-sensitive current interrupting means can be used.

Further, in the above embodiment, the secondary battery 11
Although the current interrupting device 1 used as a safety device has been described above, these current interrupting devices 1 are used in sealed devices other than primary batteries and batteries in which there is a danger that the internal pressure or temperature may increase abnormally due to the continuous flow of current. Can also be used in common. Further, the fusing current, sensitive temperature and sensitive pressure of the overcurrent prevention fuse 4 can be set arbitrarily according to the equipment to be used.

[0048]

As is apparent from the above description, according to the current interrupting device of the present invention, any two or more of pressure, temperature, and current abnormalities are detected, and any one of these two or more abnormalities is detected. Since the current can be reliably cut off in the event of even one abnormality, the reliability as a safety device can be improved as compared with the case where only one type of abnormality is detected. In addition, the current interrupting device can be miniaturized by sharing the interrupting portion of the conductive path when the pressure, temperature, and current become abnormal. Further, by using a snap-action type pressure-sensitive diaphragm for the pressure-sensitive current interrupting means or using a thermally expandable resin body for the temperature-sensitive current interrupting means, the cutoff state of the conductive path can be reliably maintained. . Further, a highly safe battery can be obtained by using the current interrupting device.

[Brief description of the drawings]

FIG. 1, showing one embodiment of the present invention, is a longitudinal sectional view illustrating a structure of a current interrupting device.

FIG. 2, showing an embodiment of the present invention, is an overall perspective view of a current interrupting device.

FIG. 3 illustrates one embodiment of the present invention, and is a diagram illustrating an internal configuration of a secondary battery using a current interrupting device.

FIG. 4, showing an embodiment of the present invention, is a longitudinal sectional view illustrating an internal state of a current interrupting device when a temperature exceeds a predetermined value.

FIG. 5, showing an embodiment of the present invention, is a longitudinal sectional view illustrating an internal state of the current interrupting device when a pressure exceeds a predetermined value.

FIG. 6 shows a conventional example, and is a longitudinal sectional view showing a structure of a battery safety device.

FIG. 7 is a longitudinal sectional view showing another conventional example and showing the structure of a battery safety device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current interrupting device 2 Current interrupting device main body 2a Diaphragm part 4 Overcurrent prevention fuse 6 Cutting blade plate 7 Resin plate containing heat-expandable foaming agent 8 Heat-shrinkable tube 10 Foaming mat 11 Secondary battery

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Hanafusa 3-3 Satsuki-cho, Kanuma-shi, Tochigi Prefecture Kanto Works, Sumitomo Electric Industries, Ltd. (72) Keiichi Tanaka 1-3-1 Shimaya, Konohana-ku, Osaka-shi Sumitomo Electric Industries, Ltd. Osaka Works (72) Inventor Takehiro Hosokawa 1-3-1, Shimaya, Konohana-ku, Osaka City Sumitomo Electric Industries, Ltd. Osaka Works

Claims (12)

[Claims] A pressure-sensitive current interrupting means for interrupting a conductive path when ambient pressure exceeds a predetermined value; and a temperature-sensitive current interrupting means for interrupting a conductive path when ambient temperature exceeds a predetermined value. Current interrupting device characterized by the above-mentioned. 2. A conductive path comprising an overcurrent preventing fuse which blows when a current exceeds a predetermined value or a conductive path including the overcurrent preventing fuse, and a temperature sensitive element which cuts off the conductive path when an ambient temperature exceeds a predetermined value. A current interrupter, comprising: a current interrupter. 3. A pressure-sensitive circuit for cutting off a conductive path comprising an overcurrent preventing fuse which blows when a current exceeds a predetermined value or a conductive path including the overcurrent preventing fuse, and a conductive path which cuts off the conductive path when ambient pressure exceeds a predetermined value. A current interrupting device comprising: a current interrupting device of a type; and a temperature-responsive current interrupting device of a type that interrupts a conductive path when an ambient temperature exceeds a predetermined value. 4. A pressure-sensitive circuit comprising an overcurrent prevention fuse or a conduction path including the overcurrent prevention fuse which blows when the current exceeds a predetermined value, and a pressure response which interrupts the conduction path when an ambient pressure exceeds a predetermined value. A current interrupter, comprising: a current interrupter. 5. A pressure-sensitive diaphragm of a snap-action type, wherein said pressure-sensitive current interrupting means is depressed inward when a pressure exceeding a predetermined value is received, and cuts off a conductive path when depressed inward. The current interruption device according to claim 1, wherein the current interruption device is: 6. The pressure-sensitive current interrupting means according to claim 1, wherein said pressure-sensitive current interrupting means interrupts a conductive path when an ambient pressure becomes 5 kgf / cm ² or more. Current interrupt device. 7. A heat-expandable resin body, which expands and expands when the temperature exceeds a predetermined value;
The current interrupting device according to any one of claims 1 to 3, wherein the conductive path is cut by pressing when the thermally expandable resin body expands. 8. The temperature-sensitive current interrupting means for interrupting a conductive path when an ambient temperature rises to 130 ° C. or higher.
The current interruption device according to any one of the above. 9. The current cutoff device according to claim 2, wherein the overcurrent prevention fuse blows when a current of 5 A or more flows. 10. The current interrupting device according to claim 1, wherein the current interrupting device comprises a container mainly made of stainless steel. 11. A current interrupting device according to claim 1, wherein said current interrupting device is inserted in a current path of a charge / discharge current in a battery case of a secondary battery. battery. 12. A battery having a built-in current interrupting device, wherein the current interrupting device according to claim 1 is inserted into a current path of a charging / discharging current in a battery case of a primary battery. .