JP3520939B2 - Protection device and storage battery using this protection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective device used for ensuring the safety of rechargeable storage batteries such as secondary batteries and the like, and a storage battery provided with this protective device.

[0002]

2. Description of the Related Art If a storage battery of this type is charged further, or if it is charged with a current larger than a specified current, an abnormality will occur in the storage battery and gas will be generated in the storage battery. If the storage battery continues to be used in such a state due to the pressure and temperature inside the storage battery rising, and the electrolyte oozing out due to the expansion and cracking of the storage battery, it may adversely affect the equipment in which the storage battery is installed. . Further, even if it has not been achieved so far, if the storage battery is continuously used in such a state, the storage battery may expand, and cracks or ruptures may occur, and it is necessary to immediately stop the use of the storage battery having an abnormality.

Therefore, safety measures have been taken for this type of storage battery, and the storage battery is provided with a safety valve that opens when the atmospheric pressure in the storage battery rises and exhausts the gas in the storage battery, and the temperature rise is detected. For example, there is an electric circuit connected to the storage battery that is provided with a means to prevent current from flowing outside the storage battery.

[0004]

However, in order to provide a safety valve in the storage battery, it is necessary to consider the piping to be provided in the storage battery, which is a constraint in designing the storage battery and the temperature inside the storage battery. In the type that detects the rise of the storage battery, the storage battery may be reused when the temperature decreases over time.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the degree of freedom in designing a storage battery and to provide a storage battery having an abnormality in which the atmospheric pressure inside the storage battery rises. An object of the present invention is to provide a protection device that can be surely stopped from being used and a storage battery using this protection device.

[0006]

As a first means for achieving the above object, the protection device according to the present invention is a guide device.
A housing with a hollow interior that is electrically conductive and is housed in the housing.
Stored conductive path and the conductive path stored in the housing
Holds elastic and insulating holding members and flexible and
And a lid having conductivity, the lid being the casing.
The holding member is inserted so that the hollow inside of the body is hermetically sealed.
And is coupled to the housing, and the lid and the housing
And the conductive path is sandwiched by the
And the lid body are electrically connected to each other, and
Contact the conductive path at a position facing the central area including the central area.
Providing a convex part in contact with the case,
The conductivity for creating a step in the broken conductive path.
The road level difference forming means provided by flexing of the front Kifuta body by external pressure, is caused a step wherein the convex portion is broken the conductive path
Therefore , the electrical connection between the housing and the lid is cut off.

As a second means for achieving the above object, the protective device of the present invention has an insulating property.
A housing with a hollow interior and a conductive path housed in the housing
And connected to the conducting path and conducting through the conducting path
A pair of wiring members and the conductive path housed in the housing.
Holding member having elasticity and insulating property for holding
And a lid having insulating properties, the lid being
The holding member so that the hollow inside of the housing is in a sealed state.
Is coupled to the housing via the
The conductive path is sandwiched between the housing and the wiring member
And extending out of the space enclosed by the holding member and the lid.
The lid has a central portion including the central portion of the conductive path.
Protruding parts are provided by abutting on the conductive paths at positions facing each other.
However, the housing was broken due to the bending of the lid.
Conductive path step forming means for creating a step in the conductive path
Provided by flexing of the front Kifuta body by external pressure, the convex portion
There causing a step by breaking the conductive path, and configured to cut off the conduction between the pair of wiring members.

As a third means for achieving the above object, the conductive path step forming means provided in the casing is
Provided on the ceiling surface inside the hollow of the housing, the conductive path step shape
The position of the forming means is from a position facing the convex portion of the lid,
It is configured to be provided at a shifted position .

As a fourth means for achieving the above object, the bottom face of the lid body faces the conductive path.
At the position, a protrusion that protrudes inward of the casing is formed, and the protrusion is
The projecting portion is provided at the projecting portion .

Further, in the first means, the housing and the front
A conductive foil is provided on each of the lids to make them conductive and
The foil was used as an external lead terminal of the conductive path . In the second means, the conductive path is a ceramic substrate.
An electrode is formed on the surface of . Also, the first
2 or 3, the conductive path and the pair of wiring parts
The material is formed of a conductive plate, and these are integrally provided.

Further, the protection device in the first means is provided in the storage battery, the internal electrode and the external electrode of the storage battery are connected to the housing and the lid, and the internal electrode and the external electrode are connected through the conductive path. The electrodes are electrically connected. Further, a configuration in which the protection device according to the second means is provided in the storage battery, the wiring member is connected to the internal electrode and the external electrode of the storage battery, and the internal electrode and the external electrode are electrically connected via the conductive path. And

[0012]

According to the first means, the conductive path is broken by the bending of the housing or the lid by the external pressure, and the electrical connection between the housing and the lid can be cut off. . Further, according to the second means, it is possible to break the conductive path and interrupt the conduction between the pair of wiring members due to the bending of the housing or the lid by the external pressure. According to the third means, the convex portion provided on the lid body breaks the conductive path due to the bending of the lid body due to the external pressure, and the conduction between the housing and the lid body is cut off. You can According to the fourth means, due to the bending of the lid body due to the external pressure, the convex portion provided on the lid body breaks the conductive path to interrupt the conduction between the pair of wiring members. .

In the third and fourth means, a projecting portion projecting inward of the casing is formed at a position of the lid body facing the center of the conductive path, and the projecting portion is provided with a projecting portion. As a result, the rigidity of the lid can be reduced. Further, in the third and fourth means, a conductive path step forming means is provided on the ceiling surface inside the hollow of the housing, and the conductive path step forming means is displaced from a position facing the convex portion of the lid body. By forming it in the open position, it is possible to reliably cut off the conduction between the housing and the lid and the conduction between the pair of wiring members. Further, in the third means, a conductive foil is provided on each of the housing and the lid to make them conductive, and the metal foil is used as an external lead terminal of the conductive path, thereby facilitating connection with an external device. can do.

Further, in the fourth means, the conductive path is formed with an electrode on the surface of the ceramic substrate, so that the convex portion provided on the lid body is formed by the bending of the lid body due to external pressure. The conductive path can be broken. Moreover, in the fourth means, the number of parts and the number of steps can be reduced by integrally providing the conductive path and the wiring member.

Further, the protection device according to the third means is provided in the storage battery, the internal electrode and the external electrode of the storage battery are connected to the casing and the lid, and the internal electrode and the external electrode are connected through the conductive path. By electrically connecting between the electrodes, receiving the atmospheric pressure rise in the storage battery as an external pressure and bending the lid, the conductive path is broken and the electrical connection between the internal electrode and the external electrode is cut off. You can

Further, the protection device in the fourth means is provided in the storage battery, the pair of wiring members are respectively connected to the internal electrode and the external electrode of the storage battery, and the internal electrode and the external electrode are connected through the conductive path. By electrically connecting between the two, by receiving an increase in atmospheric pressure in the storage battery as an external pressure and bending the lid, the conductive path may be broken and the electrical connection between the internal electrode and the external electrode may be cut off. it can.

[0017]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 12 show a protection device according to a first embodiment of the present invention. Explaining the first embodiment, the protection device 1 includes a housing 2, a conductive path 5, and a holding member 1.
0 and the lid 12.

An electrically conductive inner hollow casing 2 made of a material such as aluminum has an upper surface portion 2a and a side surface portion 2b, and a central portion of the upper surface portion 2a has a protruding portion protruding upward in a rectangular shape. By providing 3, the recess 4 is provided inside the housing 2. As shown in FIG. 2, the conductive path 5 is made of a material such as ceramic, has an insulating property, and has a rectangular parallelepiped insulating member 6 that can be cracked by an external pressure, and the entire upper surface and a part of the side surface of the insulating member 6. Further, a conductive portion 7 formed by printing and firing a paste containing silver or the like on one end of the lower surface, or a metal material formed by a method such as plating, and a conductive portion 7 formed on the upper surface of the insulating member 6. A conductive portion 7 formed on the upper surface of the insulating member 6 by a connecting portion 7b on the opposite side to the extending portion 7a. It is in a state of being connected to a lead-out portion 7c provided on the lower surface of the insulating member 6.

In the normal case, the conductive path 5 has a lead-out portion 7
The conductive portions 7 formed on the upper surface of the insulating member 6 are disconnected when the insulating member 6 is cracked by external pressure, and the conductive portions 7a and 7c are disconnected from the lead portions 7a and 7c. The continuity between them is cut off. And this conductive path 5
Is formed longer than the longitudinal direction of the recess 4 of the housing 2 as shown in FIG. 4 and shorter than the lateral direction of the recess 4 as shown in FIG. 5, and the conductive path 5 straddles the recess 4. Thus, it is bridged in the longitudinal direction thereof, and both ends of the upper surface thereof, that is, the lead-out portion 7a and the insulating portion 8 abut on the inner wall of the upper surface portion 2a of the housing 2, and are housed in the housing 2. Moreover, when stored, the conductive path 5 is located on the recess 4 in the lateral direction thereof as shown in FIG. Then you can enter. The depth of the recess 4 is set so that the conductive path 5 can be cracked therein. Also,
In the embodiment shown in FIG. 4, the ceiling surface 4a of the concave portion 4 is on the same plane, but as another embodiment, as shown in FIG. 9, the ceiling surface 4a of the concave portion 4 is provided with a step 4b which is a conductive path step forming means. Some are provided.

A holding member 9 made of a rubber material and having a hollow inner shape and having an insulating property is composed of an upper surface portion 9a and a side surface portion 9b, and as shown in FIG. A slightly larger opening 10 is provided, and projections 11 are provided on the inner wall of the upper surface portion 9a along both longitudinal edges of the opening 10.

The holding member 9 is housed in an internal hollow formed by the upper surface 2a and the side surface 2b of the housing 2, and the outer walls of the upper surface 9a and the side surface 9b are respectively the upper surface of the housing 2. It is in contact with the inner walls of 2a and the side surface portion 2b. Further, when the holding member 9 is housed in the hollow inside of the housing 2, the conductive path 5 is located in the opening 10, and the conductive path 5 is located at a predetermined position with the housing 2 by the opening 10 and the projection 11. The movement of the conductive path 5 in the long and short directions and in the vertical direction is regulated so that the conductive paths 5 come into contact with each other.

The lid 12 made of a material such as flexible aluminum having a conductive property is formed in a boat shape by providing a concave portion 14 protruding downward with an edge 13 left over the entire circumference thereof. The bottom surface portion 15 of the recess 14 can be bent upward under external pressure,
A pair of convex portions 16 and 17 are formed at both ends of the bottom portion so as to project upward in the lateral direction, and further, at the center of the bottom surface portion 15, one convex portion protruding upward. 18 is formed and configured.

The edge 12 of the lid 12 is in contact with the inner wall of the upper surface 9a of the holding member 9 and the convex portion 1 is formed.
6 and 18 are at one end and the center of the lower surface of the conductive path 5,
Further, the convex portion 17 is housed in the holding member 9 while being in contact with the lead-out portion 7c on the lower surface of the conductive path 5. The lid body 12 is supported by sandwiching the edge portion 13 in a close contact state by the side surface portion 9b and the upper surface portion 9a which are bent inward of the holding member 9.

The holding member 9 has its side surface portion 9b bent by the side surface portion 2b bent inwardly of the housing 2, and the outer wall of its upper surface portion 9a abuts on the upper surface portion 2a of the housing 2. The holding member 9 is attached by being sandwiched between the upper surface portion 2a and the side surface portion 2b. as a result,
Due to the elasticity of the holding member 9 itself, the upper surface portion 9a and the side surface portion 9b thereof respectively have an upper surface portion 2a and a side surface portion 2b of the housing 2.
The inner wall surrounded by the housing 2, the holding member 9 and the lid 12 is in a hermetically sealed state, and the conductive path 5 is located inside the inner wall.

As a result, the conductive path 5 is formed in the convex portion 1 of the lid 12.
6, 17, 18 presses the upper surface in the direction of the concave portion 4 of the housing 2, the pull-out portion 7a is always in contact with the inner wall of the upper surface 2a of the housing 2, and the pull-out portion 7c is a convex portion of the lid 12. Part 1
7, the casing 2 and the lid 12 are in electrical connection with each other through the conductive path 5. Furthermore, the protective device 1 is a rectangular conductive foil 1 as an external lead-out terminal of the conductive path 5.
As shown in FIGS. 4 and 5, the conductive foil 19 is provided on the outer wall of the protrusion 3 of the housing 2 so as to be symmetrical with respect to the center of the protrusion 3 in the longitudinal direction thereof. ,Also,
It is attached by ultrasonic welding or the like so as to protrude from one end of the protruding portion 3 in the lateral direction and not to protrude from the other end.

Similarly to the above, the conductive foil 20 is provided on the outer wall of the recess 14 of the lid 12, and the recess 14 is provided in the longitudinal direction.
So as to be bilaterally symmetrical with respect to the center, and to project from one end opposite to the side opposite to the one end where the conductive foil 19 of the projecting portion 3 projects in the lateral direction and not to protrude from the other end. It is located and attached by ultrasonic welding or the like. Therefore, the conductive foils 19 and 20 are electrically connected to each other, and a current can flow from the conductive foil 19 to the conductive path 5 through the housing 2, and further from the conductive path 5 to the conductive foil 20 through the lid 12. It is also possible to flow in the opposite direction.

Next, the assembling method of the protection device 1 will be described. First, the holding member 9 is housed in the hollow inside of the housing 2, and the upper surface portion 9a and the side surface portion 9b thereof are respectively on the upper surface of the housing 2. The conductive path 5 is inserted into the opening 11 of the holding member 9 by contacting the portion 2a and the side surface portion 2b, and the lead-out portion 7a and the insulating portion 8 of the conductive portion 7 formed on the upper surface of the conductive path 5 are removed. Case 2
It is placed on the upper surface 2a of the.

Next, the lid 12 is introduced into the hollow inside of the holding member 9, and the square of the edge 13 and the upper surface 9 of the holding member 9 are introduced.
When the edge portion 13 is brought into contact with the upper surface portion 9a of the holding member 9 so that the squares of the inner wall of a coincide with each other, the convex portions 16 and 18 are respectively at one end and the central portion of the lower surface of the conductive path 5, and The convex portion 17 is in contact with the lead-out portion 7c on the lower surface of the conductive path 5.

Thereafter, when the side surface portion 2b of the housing 2 is bent inward, the side surface portion 9b of the holding member 9 is also converted into the side surface portion 2b.
Then, it is bent so that the edge portion 13 of the lid body 12 is sandwiched between the edge portion 13 of the lid body 12 and the upper surface portion 9a of the holding member 9. Then, when the side surface portion 2b of the housing 2 is bent inward, the holding member 9 has the side surface portion 9 in which the edge portion 13 of the lid 12 is bent.
It is sandwiched and supported by b and the upper surface portion 9a, and is sandwiched by the bent side surface portion 2b of the housing 2 and the upper surface portion 2a, that is, it is caulked and attached.

Finally, the rectangular conductive foil 19 is arranged symmetrically with respect to the center of the projecting portion 3 of the housing 2 in the longitudinal direction, and one end of the projecting portion 3 in the lateral direction. Is located so as not to protrude from the other end and protrude from the other end.
Attach it to the outer wall by ultrasonic welding. Further, similarly to the above, the rectangular conductive foil 20 is provided with the lid 1 in the longitudinal direction.
2 so as to be bilaterally symmetrical with respect to the center of the concave portion 14, and to project in the lateral direction from one end of the projecting portion 3 of the housing 2 opposite to the one end where the conductive foil 19 projects. The recess 14 of the lid 12 is positioned so as not to protrude from the other end.
Attach it to the outer wall by ultrasonic welding.

In this way, the assembling of the protective device 1 is completed, but after the assembling, the inside of the protective device 1 has its upper surface portion 9a and side surface portion 9 due to the elasticity of the holding member 9 itself.
b is in close contact with the edge portion 13 of the lid body 12 and with the inner walls of the upper surface portion 2a and the side surface portion 2b of the housing 2 without any gap, whereby the housing 2, the holding member 9 and the lid are attached. Body 12
The inside surrounded by is sealed.

Protective device 1 assembled in this way
Is incorporated into a storage battery such as a lithium ion secondary battery or a nickel hydrogen secondary battery. FIG. 6 shows an outline of a storage battery by taking a lithium ion secondary battery as an example. A bottomed inner hollow cylindrical body 21 having an open upper end has an opening at a bottom surface 21a thereof. The opening is made of stainless steel and is closed by a negative electrode can 22 having conductivity. In addition, the positive electrode lid 2 made of stainless steel and having conductivity
Reference numeral 3 denotes an external electrode, which seals the upper end portion of the cylindrical body 21 so that the inside of the cylindrical body 21 is in a sealed state.

Inside the cylindrical body 21, a positive electrode 24 made of lithium cobalt oxide as an internal electrode, a negative electrode 25 made of carbon, a separator 26 for preventing a short circuit between the positive electrode 24 and the negative electrode 25, and a protection device 1 are incorporated. The protective device 1 is provided with a positive electrode lid 23 by the conductive foil 19.
Is connected to the positive electrode 24 by the conductive foil 20.
Connected with. Further, the negative electrode 25 is provided so as to face the positive electrode 24 with the separator 26 interposed therebetween, and is connected to the negative electrode can 22. Furthermore, the inside of this cylindrical body 21 is filled with an electrolytic solution. Then, the positive electrode lid 23 of the lithium-ion secondary battery configured as described above
When a specified current is passed between the negative electrode can 22 and the negative electrode can 22, a chemical reaction occurs between the positive electrode 24 and the negative electrode 25 to perform charging.

During charging, a current in the protective device 1 sequentially flows from the positive electrode lid 23 to the conductive foil 19, the housing 2, the conductive path 5, the lid 12, and the conductive foil 20, and is led to the positive electrode 24. That is, the current flows to the housing 2 integrated with the conductive foil 19,
The lead-out portion 7 on the lower surface of the conductive path 5 passes through the connecting portion 7b from the lead-out portion 7a of the conductive path 5 that contacts the inner wall of the upper surface portion 2a of the housing 2.
It is led out to the positive electrode 24 by the conductive foil 20 from the lid 12 which is led to the lead portion 7c and the convex portion 17 of the lead portion 7c. At this time, even if charging is completed, the current continues to flow and further overcharge is performed, or if charging is performed with a current larger than the specified current, the electrolytic solution in the storage battery is decomposed and Gas is generated and the pressure in the storage battery rises.

When the pressure in the storage battery rises, it is transmitted to the protection device 1 as an external pressure. Then, as shown in FIG.
This external pressure causes the bottom surface portion 15 of the lid body 12 to bend inward and deform, and the convex portion 18 formed on the bottom surface portion 15 of the lid body 12 pushes the conductive path 5 upward. In the conductive path 5 whose movement is restricted in the longitudinal direction and the vertical direction, when the pressure in the storage battery further rises and reaches a certain pressure, the lid 12 is further deformed by receiving this pressure. The conductive path 5 is pushed into the concave portion 4 of the housing 2 by the convex portion 18 of the lid body 12 and splits. At this time, the conductive portion 7 forming the conductive path 5 is broken, and the electrical connection between the lead portions 7a and 7c is cut off, so that the protection device 1 has the positive electrode lid 23 and the positive electrode 24.
The current flowing between them is cut off and further charging is stopped, and this lithium ion secondary battery is made incapable of functioning as a storage battery.

At this time, as shown in FIG.
Both of the cracked end portions 5a and 5b are in contact with the ceiling surface 4a of the concave portion 4 of the conductive housing 2, but the upper surface of the conductive portion 7 of the conductive path 5 is coated with the coating. Alternatively, since the insulating portion 8 is covered with the adhesive, the broken conductive portion 7 is not electrically connected. At this time, the ceiling surface 4a of the recess 4 of the housing 2 is formed in the same plane.
However, the coating of the insulating portion 8 on the cracked end portions 5a and 5b of the conductive path 5 that is brought into contact with the ceiling surface 4a of the recess 4 of the housing 2 is If the elongation of the coating is large, the ends 5a, 5b are pulled to the left and right and become thin, so that the ends 5a, 5 of the conductive path 5 are thinned.
b is the housing 2 having the conductivity due to the pressure from the lid 12.
When it hits the ceiling surface 4a of the concave portion 4, there is a risk that the covered insulating portion 8 is broken and the ends 5a and 5b are electrically connected.

Even if the insulating portion 8 is not broken, the increased pressure in the storage battery may temporarily drop due to the influence of the change in the external temperature of the storage battery, and if the pressure drops,
The bottom portion 15 of the lid 12 that has been bent inward until then becomes temporarily flat and flat. At this time, the broken conductive path 5 may be flattened as shown in FIG. That is, when the broken conductive path 5 becomes flat, as shown in FIG. 8, there is no gap between the end portions 5a and 5b of the broken conductive path 5, and the end portions 5a and 5b are electrically connected to each other to cause an abnormality. There is a problem in that the storage battery in which the problem occurs is directly incorporated into a device or the like.

As a method for solving the above-mentioned problem, as shown in FIG. 9, the ceiling surface 4a of the concave portion 4 of the casing 2 is electrically conductive at a position deviated from the position facing the central convex portion 18 of the lid 12. The step 4b of the path forming means is provided, and the step 4b prevents the end 5a, which is one of the broken ends of the conductive path 5, from coming into contact with the ceiling surface 4a of the recess 4 of the housing 2. Since the covered insulating portion 8 of the end portion 5a is not broken, there is no risk of the end portions 5a and 5b being electrically connected. Even if the bottom surface 15 of the lid 12 is temporarily flattened due to a decrease in the pressure of the storage battery due to a change in the external temperature of the storage battery or the like, as shown in FIG. Because the steps 5a and 5b are displaced in the plate thickness direction of the conductive path 5 due to the function of the step 4b, there is no risk of the ends 5a and 5b contacting and electrically conducting. The electrical continuity of the conductive portion 7 can be cut off more reliably than in the case where 4a is on the same plane. Further, as a method of providing a step 4b on the ceiling surface 4a of the recess 4 of the housing 2, as shown in FIG.
As described above, it is possible to form the step by plastically deforming the housing 2 by pressing or the like. Further, the conductive path forming means is not limited to the method of forming the step 4b, and the same effect can be obtained by using the convex portion 4c as shown in FIG.

Therefore, in the present invention, since the pressure generated in the storage battery is evenly applied anywhere in the storage battery, the protection device 1 may be installed anywhere in the storage battery, and is safe when designing the storage battery. The degree of freedom can be improved in providing the mechanism. Further, since the protection device 1 can surely disable the function of the storage battery in which the abnormality has occurred as the storage battery, when the storage battery in which the abnormality has occurred is incorporated in the device, electrolysis due to cracking or rupture of the storage battery occurs. It is possible to prevent an adverse effect on the device due to the exudation of the liquid. Further, in the above-described embodiment, the lid 12 has a flexible structure, but the housing 2 may have a flexible structure.

The protective device shown as the second embodiment in FIGS. 13 and 14 is a case 27, wiring members 34, 35,
It is composed of a conductive path 36 and a lid 39. The inner hollow casing 27 made of an insulating material such as polybutylene terephthalate is
It is composed of the upper surface portion 27a, the long side surface portions 27b and 27c, and the short side surface portions 27d and 27e. As shown in FIG. 13, the housing 2 and the holding member 9 shown in the first embodiment are configured as one. It is formed by resin molding.
The upper surface portion 27a has receiving portions 28a, 2 which are recessed in a rectangular shape so as to be symmetrical in the longitudinal direction with respect to the central portion thereof.
8b is provided. Then, by providing the protruding portion 29 protruding upward in a rectangular shape between the receiving portions 28a and 28b, the receiving portions 28a and 28b are connected to the inside of the housing 27, and the concave portion 4 shown in the first embodiment. A recess 30 having the same structure as that of FIG.
Although the ceiling surface 30a of No. 0 is on the same plane, it may be configured to have the step of the conductive path step forming means as described in the first embodiment. Further, on the inner wall of the upper surface portion 27a, protrusions 33 are provided along both edges of the recess 30 in the longitudinal direction.

Bendable conductive wiring member 3
4, 35 have a rectangular shape. And this wiring member 3
As shown in FIG. 13, the reference numerals 4 and 35 are integrally formed with the housing 27 by molding, and one end of each is provided with a receiving portion 28 of the housing 27.
a, 29b, and is positioned without protruding into the recess 30. The conductive path 36 is formed by printing an insulating member 73 having the same structure as the insulating member 6 shown in the first embodiment and a paste containing silver or the like on the entire upper surface of the insulating member 73 and firing the paste. Alternatively, it is composed of a conductive portion 37 formed by a method such as plating a metal material, and an insulating portion 38 formed by applying an insulating material on the conductive portion 37 leaving the lead portions 37a and 37b. The path 36 is the drawer 3
7a and 37b are in a conductive state, but when the insulating member 73 is cracked by an external pressure, the conductive portion 37 formed on the insulating member 73 is disconnected and the lead portions 37a and 37b.
The conduction between b is cut off.

The conductive path 36 is bridged in the longitudinal direction so as to straddle the recess 30 of the housing 27, and the lead-out portions 37a and 37b are brought into contact with one ends of the wiring members 34 and 35, respectively. It is stored in the groove 28 of 27,
The wiring members 34 and 35 are in a conductive state via a conductive path 36. Moreover, when stored, as in the case of the first embodiment, it is located on the concave portion 30 in the lateral direction thereof, has voids at both ends thereof, and sinks into the concave portion 30. Can enter. The depth of the recess 30 is set so that the conductive path 36 can be cracked therein. Further, at this time, the conductive paths 36 are restricted in movement in the longitudinal direction and in the vertical direction so that the receiving portions 28a, 28b and the protrusions 33 make contact with one ends of the wiring members 34, 35 at predetermined positions.

The lid 39 having a flexible insulating property has the same structure as the lid 12 shown in the first embodiment. The edge 39 of the lid 39 is fixed to the upper surface 27 of the housing 27.
a in contact with the inner wall of a, and the convex portions 41, 42, 43
Is brought into contact with the lower surface of the conductive path 36 and is housed in the hollow inside of the housing 27. The lid 39 has the edge 4
Longitudinal side surface portion 27 in which 0 is bent inward of the housing 27
b, 27c and short side surface portions 27d, 27e and upper surface portion 2
It is sandwiched and attached by 7a and 7a. As a result, the inside surrounded by the housing 27 and the lid 39 is in a hermetically sealed state, and the conductive path 36 is positioned inside this.

Although not shown here, this protection device also has wiring members 34, 3 as shown in FIG.
5 is connected to the positive electrode lid 23 and the positive electrode 24 to connect the lithium ion 2
When it is incorporated in the secondary battery and is overcharged or charged with a current larger than the specified current, the lid 39 moves inward due to an increase in pressure in the lithium ion secondary battery. By bending and splitting the conductive path 36, the positive electrode lid 23,
The current flowing between the positive electrodes 24 is cut off. Therefore, also in the second embodiment, overcharge can be stopped, and this lithium ion secondary battery can be rendered incapable of functioning as a storage battery, causing a rupture due to expansion of the storage battery into a device incorporating the lithium ion secondary battery. Furthermore, it is possible to prevent the adverse effect of the seepage of the electrolytic solution due to the crack. Further, in this embodiment, since the housing 27 is configured by combining the housing 2 and the holding member 9 shown in the first embodiment, the number of parts is smaller than that in the first embodiment, and the number of assembling steps is reduced. Therefore, the product cost can be reduced. Further, although the lid 39 is flexible in the second embodiment, the housing 27 may be flexible.

The protection device shown as the third embodiment in FIGS. 15 to 17 comprises a housing 44, a holding member 48, a conductive wiring path 50, and a lid 51. The inner hollow casing 44 made of an insulating material has an upper surface portion 44a and a side surface portion 44b.
The inside of the housing 44 has a structure similar to that of the housing 2 shown in the first embodiment and is provided with a protruding portion 45 protruding upward in a rectangular shape at the center of the upper surface portion 44a. Further, a recess 46 having the same structure as the recess 4 shown in the first embodiment is provided. Then, as shown in FIG. 16, the projecting portion 45 projects into the housing 44 with a certain width in the longitudinal direction thereof, and as shown in FIG. 17, has a serrated cross section in its lateral direction. A protrusion 47 is provided.

A holding member 48 made of a rubber material and having a hollow interior has a top surface portion 48a and a side surface portion 48b, and has a structure in which the projection 11 is removed from the holding member 9 shown in the first embodiment. An opening 49 is provided in the upper surface portion 48a. The conductive wiring path 50, which is made of a metal foil having a tearable rectangular shape and has conductivity, is formed by the protrusion 4 of the housing 44.
It is arranged so as to face 7. This conductive wiring path 5
As shown in FIG. 17, 0 is provided integrally with the holding member 48 by molding, bridges the opening 49 of the holding member 48 in the lateral direction, and forms voids at both ends of the opening 49. Has been. Further, both ends 50 a and 50 b in the longitudinal direction of the conductive wiring path 50 are formed on the side surface portion 4 of the holding member 48.
It is derived from the lower end of 8b, and both ends 50a, 50
Conduction is established between b.

The holding member 48 has an upper surface 4
The outer walls of 8a and the side surface portion 48b contact the inner walls of the upper surface portion 44a and the side surface 44b of the housing 44, respectively.
It is housed in an internal hollow formed by the upper surface portion 44a and the side surface portion 44b. Moreover, when housed in the hollow inside of the housing 44, the conductive wiring path 50 is positioned so as to abut directly below the protruding portion 47 as shown in FIGS.
It is possible to immerse yourself in 6 and enter.

The lid 51 having a flexible insulating property is the same as the lid 12 shown in the first embodiment except that the projections 16, 17,
It has a configuration in which 18 is deleted, and it is formed in a boat shape by providing a concave portion 53 that protrudes downward with the edge portion 52 being left over the entire circumference, and the bottom surface portion 54 of the concave portion 53 receives an external pressure and is upward. A breaking protrusion 55 protruding upward is attached to the central portion of the bottom face portion 54 by an adhesive or the like. As shown in FIG. 16, the breaking protrusion 55 has a width in the longitudinal direction of the protrusion 47 of the housing 44.
17, and is formed so as to mesh with the valley portion 47a of the protrusion 47 of the housing 44, as shown in FIG.

The lid 51 is housed in the hollow inside of the holding member 48 with its edge portion 52 abutting against the inner wall of the upper surface 48a of the holding member 48. Is a trough 47a of the protrusion 47 of the housing 44.
When the bottom surface portion 54 is bent upward due to external pressure, the breaking protrusion 55 causes the breakage protrusion 55 to protrude from the protrusion portion 4 of the housing 44.
The conductive wiring path 50 is formed by meshing with the valley portion 47a of FIG.
Is broken to disconnect the conduction between both ends 50a and 50b.

The lid 51 has a side portion 48b and an upper surface portion 48 whose edges 52 are bent inward of the holding member 48.
It is sandwiched and supported by a. In addition, the holding member 48 has its side surface portion 48b bent by the side surface portion 44a bent inward of the housing 44, and the outer wall of the upper surface portion 48a abuts on the upper surface portion 44a of the housing 44, so that the holding member 48 has an upper surface. The holding member 48 is sandwiched and attached by the portion 44a and the side surface portion 44b. As a result, due to the elasticity of the holding member 48 itself, its upper surface portion 48 is
a and the side surface portion 48 b are respectively the upper surface portion 4 of the housing 44.
4a and the inner wall of the side surface portion 44b are in close contact with each other without a gap, whereby the inside surrounded by the housing 44, the holding member 48, and the lid 51 is in a hermetically sealed state.

Although not shown in the drawing, the protective device also includes a conductive wiring line 5 in the storage battery as shown in FIG.
Both ends 50a and 50b of 0 are the positive electrode 24 and the positive electrode lid 2, respectively.
3 is installed in the same manner as in the first embodiment by connecting to No. 3, the lid 51 bends inward due to an increase in pressure in the storage battery, and the breaking protrusion 55 attached to the lid 51 is the protrusion of the housing 44. By engaging with the valley portion 47a of the portion 47, the conductive wiring path 50 is broken to interrupt the current flowing between the positive electrode lid 23 and the positive electrode 24.

In the third embodiment, by using the conductive wiring path 50, the conductive path 5 and the conductive foils 19 and 20 shown in the first embodiment are unnecessary, and the number of parts can be reduced. In addition, it is possible to eliminate the step of forming the conductive path 5 and the step of welding the conductive foils 19 and 20 to the housing 2 and the lid 12, respectively. Also, in the third embodiment, the lid 51 has a flexible structure, but the housing 4
4 may be flexible.

Further, the protective device shown as the fourth embodiment in FIGS. 18 to 21 is the case 56, the conductive path 36, and the holding member 5.
9, wiring members 64 and 65, and a lid 66. The inner hollow casing 56 made of a material such as stainless steel is used for the upper surface portion 5.
6a and a side surface portion 56b, and has the same configuration as the housing 2 shown in the first embodiment, and a protrusion portion 57 protruding upward in a rectangular shape is provided at the center portion of the upper surface portion 56a. Thus, the recess 58 is provided inside the housing 56.

A holding member 59 made of a rubber material and having a hollow inside and having insulation has an upper surface 59a and a side surface 59.
b, and as shown in FIGS.
The opening 60 is provided in the opening 60, and the extending portions 61a and 61b extending from the both edges of the opening 60 in the lateral direction into the opening 60 do not contact the both edges of the opening 60 in the longitudinal direction, and the gaps 62a and 62b are provided. Are provided, and the extension portions 61a, 6a
At the extended end of 1b, rectangular parallelepiped protrusions 63a and 63b are provided.
Are integrally formed.

Wiring member 6 having bendable conductivity
4, 65 have a rectangular shape, and lead portions 64a, 65a extending in a rectangular shape from the end of one side thereof are integrally formed. Then, as shown in FIG. 19, the lead portion 64 a of the wiring member 64 is bent, and the side surface portion 59 b of the holding member 59 is bent.
And is in contact with the inner walls of the upper surface portion 59a and the extending portion 61a, and is located inside the hollow inside of the holding member 59. Further, the lead portion 65a of the wiring member 65 is led out from the gap 62b of the holding member 59 into the inner hollow of the holding member 59, is bent, and its tip is in contact with the inner wall of the extending portion 61b, and the upper surface portion It is bent along the outer walls of 59a and the side surface portion 59b.

The holding member 59 is housed in the hollow inside of the housing 56, and the outer walls of the upper surface portion 59a and the side surface portion 59b thereof come into contact with the inner walls of the upper surface portion 56a and the side surface portion 56b of the housing 56, respectively. Along with the extension 6
1a and 61b of the protrusions 63a and 63b are the recesses 5 of the housing 56.
8 and is in contact with its inner wall. Conductive path 36
Connect the lead-out portions 37a and 37b to the wiring member 6 respectively.
The lead portions 64 a and 65 a of the holding members 59 are in contact with the lead portions 64 a and 65 a of the holding members 59, and are housed in the hollow inside of the holding members 59. As a result, the wiring members 64 and 65 are in a conductive state via the conductive path 36. Then, when the conductive path 36 is pressed upward by an external pressure, both ends thereof are supported by the extending portions 61a and 61b, and the central portion thereof is broken.

The flexible lid body 66 is formed in a boat shape by providing a concave portion 68 that projects downward with the edge portion 67 left over the entire circumference thereof, and the bottom surface portion 6 of the concave portion 68 is formed.
9 can be bent upward under external pressure, and a pair of convex portions 70 and 71 are formed at both ends of the bottom surface portion 69 thereof so as to project upward in the lateral direction thereof.
Further, a protrusion 72 protruding upward in an elliptical shape is formed at the center of the bottom face 69, and a protrusion 74 protruding upward is provided at the center of the protrusion 72.

Therefore, since the bottom surface portion 68 is bent inward by the protrusion 72 in advance, the rigidity of the bottom surface portion 68 is suppressed as compared with the first to third embodiments to facilitate the bending. It is possible to bend due to the external pressure. The edge portion 67 of the lid body 66 abuts on the inner wall of the upper surface portion 59a of the holding member 59, and the convex portions 70, 71, 74 abut on the lower surface of the conductive path 36 as shown in FIG. It is housed in the hollow inside of the holding member 59. The lid 66 has an edge 67.
Is held in close contact with and supported by a side surface portion 59b and an upper surface portion 59a which are bent inward of the holding member 59.

Further, the holding member 59 has its side surface portion 59b formed by the side surface portion 56b bent inward of the housing 56.
While being bent, the outer wall of the upper surface portion 59a contacts the upper surface portion 56a of the housing 56, and the holding member 59 is attached by being sandwiched by the upper surface portion 56a and the side surface portion 56b. As a result, due to the elasticity of the holding member 59 itself, the upper surface portion 59a and the side surface portion 59b of the holding member 59 are in close contact with the inner walls of the upper surface portion 56a and the side surface portion 56b of the housing 56, respectively, and thereby the housing 56 and the holding member 59b. The inside surrounded by 59 and the lid 66 is in a hermetically sealed state, and the conductive path 36 is positioned inside this.

Although not shown in the drawing, the protective device also has wiring members 64, 6 as shown in FIG.
5 is connected to the positive electrode lid 23 and the positive electrode 24 to connect the lithium ion 2
The lid 66 is incorporated in the secondary battery, and the lid 66 bends inward due to an increase in pressure in the lithium-ion secondary battery, and breaks the conductive path 36 to interrupt the current flowing between the positive electrode lid 23 and the positive electrode 24. ing. Further, although the lid 66 is configured to be flexible in the fourth embodiment, the housing 56 may be configured to be flexible.

The protective device shown as the fifth embodiment in FIGS. 22 to 25 comprises a casing 75, a holding member 79, conductive paths 36, conductive members 84 and 85, and a lid 87. An inner hollow casing 75 made of a material such as aluminum has an upper surface portion 75a and a side surface portion 75b, has the same configuration as the casing 2 shown in the first embodiment, and has a central portion of the upper surface portion 75a. A concave portion 77 is provided inside the housing 75 by providing a protruding portion 76 that protrudes upward in a rectangular shape. Then, as shown in FIG. 19, the protrusions 76 are arranged in a line with a certain width in the longitudinal direction.
Two columnar portions 78 are integrally provided.

A holding member 79, which is made of a rubber material and has a hollow inside and has an insulating property, has a lower surface portion 79a and a side surface portion 79a.
As shown in FIG. 20, a rectangular opening 80 is provided in the lower surface portion 79a, and a projection 81 is formed on the inner wall of the lower surface portion 79a along the entire edge of the opening 60 to form an inner wall of the side surface portion 79b. A groove 82 is provided between the protrusion 81 and the protrusion 81. . An extending portion 83 extending from one end of the protrusion 81 in the lateral direction is provided so as to cover a part of the opening 80.

The holding member 79 accommodates the casing 75 in its inner hollow, and the groove portion 82 of the holding member 79 has the side face portion 7 of the casing 75.
It is in a state of being fitted in close contact with 5b. Also,
The extending portion 83 is in contact with the upper surface portion 75 a of the housing 75, and the tip of the extending portion 83 is led out into the recess 77 of the housing 75. A foldable conductive connecting member 8
4, 85 have a U-shaped cross section. And the connecting member 8
4 is placed on the lead-out portion 37a of the conductive path 36 and solder 86
It is attached by a. Further, the connecting member 85 is
The conductive path 36 and the lead-out portion 37b are fitted together to form the conductive path 3
6 pulling out the lead-out portion 37b to the lower surface of the solder 8
It is attached by 6a.

In this state, the conductive path 36 is accommodated in the opening 80 of the holding member 79, bridges in the longitudinal direction so as to straddle the recess 77 of the casing 75, and the connecting member 84 causes the holding member 79 to hold.
The projection 81 and the inner wall of the upper surface 75a of the housing 75 are pressed and deformed, and are in contact with each other.
5 is in contact with the protrusion 81 and the extending portion 83 of the holding member 79. Moreover, similar to the first and second embodiments, in the lateral direction thereof, it is located above the concave portion 77 and has voids at both ends thereof, and the concave portion 4 shown in the first embodiment is formed. It can be submerged in the recess 77 having the same structure. The depth of the recess 77 is set so that the conductive path 36 can be cracked therein. At this time, the conductive path 36 is connected to the connecting member 8 by the projection 81.
Extending portion 83 of the casing 75 and the protrusion 81 via 4,85
The movement in the long-short direction and the vertical direction is regulated so as to make contact with a predetermined position.

A case-shaped lid 87 made of a material such as flexible aluminum having a conductive property is composed of a lower surface portion 87a and a side surface portion 87b, and the lower surface portion 87a is bent inward under external pressure. The lower surface 87a has a pair of protrusions 8 at both ends thereof, which are spaced apart from each other and project upward in the lateral direction.
8 and 89 are formed, and further, one convex portion 90 protruding upward is formed in the central portion of the lower surface portion 87b.

The lid 87 has a holding member 79 inside.
And the inner walls of the lower surface portion 87a and the side surface portion 87b thereof are in contact with the outer walls of the lower surface portion 79a and the side surface portion 79b of the holding member 79, respectively. Further, when the holding member 79 is housed, the protrusions 88 and 90 of the lid 87 have the conductive paths 3
One end of the lower surface of 6 and the central portion are in contact with each other, and the convex portion 89 of the lid 87 is in contact with the connecting member 85 fitted to the conductive path 36.

The holding member 79 has a side surface 79b.
Is bent by the side surface portion 87b bent inward of the lid body 87, so that the side surface portion 87b of the lid body 87 is bent.
It is attached in close contact with the side surface portion 75b and the upper surface portion 75a of the housing 75. This allows the housing 7
5, the inside surrounded by the holding member 79 and the lid 87 is in a hermetically sealed state, and the conductive path 36 is in the inside.

As a result, the conductive path 36 has its upper surface pressed by the convex portions 88, 89, 90 of the lid 87 toward the concave portion 77 of the housing 75, and the lead-out portion 37a is connected to the connecting member 84.
Via the connection member 85 with the inner wall of the upper surface 75a of the casing 75 at all times, and the connecting member 85 with the convex portion 89 of the lid member 87 at all times, so that the casing 75 and the lid member 87 are electrically conductive. Road 3
It is in a conductive state through 6.

Further, this protection device is provided with rectangular conductive foils 91 and 92 as external lead-out terminals of the conductive path 36.
As shown in FIG. 2, the conductive foil 91 has its hole 91 a
It is attached to the upper surface portion 75a of the housing 75 by inserting it into the columnar portion 78 of No. 5 and striking the columnar portion 78 to deform it. The conductive foil 92 is attached to the outer wall of the side surface 87b of the lid 87 by ultrasonic welding or the like.

Although not shown in the drawing, the protective device also has conductive foils 91 and 92 as shown in FIG.
Is connected to the positive electrode lid 23 and the positive electrode 24 and is incorporated in the lithium ion secondary battery, and the lid 87 bends inward due to an increase in the pressure in the lithium ion secondary battery, and the conductive path 36 is split to break the positive electrode lid. The current flowing between 23 and the positive electrode 24 is cut off. Although the lid 87 is flexible in the fifth embodiment, the housing 75 may be flexible.

[0071]

As described above, in the protective device according to the present invention, since either the conductive case or the lid has flexibility, the case or the lid is bent by external pressure, The conductive path can be broken to interrupt the conduction between the housing and the lid. Further, in the protective device of the present invention, since either the housing or the lid having an insulating property has flexibility, the conductive path is broken by the bending of the housing or the lid due to external pressure, and the conductive It is possible to interrupt the conduction between the pair of wiring members provided in the path.

Further, in the protective device according to the present invention, the conductive casing and the conductive and flexible lid are coupled via a holding member so as to seal the hollow inside of the casing, A conductive path is located inside the sealed interior to electrically connect the casing and the lid, and a convex portion is in contact with the conductive path at a position facing the center of the conductive path of the lid. The convex portion breaks the conductive path due to the bending of the lid body that is provided due to external pressure, and thus the electrical connection between the housing and the lid body can be cut off.

Further, in the protective device according to the present invention, the case having an insulating property and the lid having the insulating property and the flexibility are coupled to each other via the holding member so as to seal the inside of the case, and the conductive member is electrically conductive. The path is located inside the sealed path, a pair of wiring members are extended from the conductive path to the outside, and a convex portion abuts on the conductive path at a position facing the center of the conductive path of the lid. When the lid is bent by an external pressure, the convex portion breaks the conductive path, so that conduction between the pair of wiring members can be interrupted. Further, in the protective device in which the hollow inside of the housing is hermetically closed, the conductive path can be reliably broken by providing the conductive path step forming means on the ceiling surface inside the hollow.

Further, in the above-mentioned protective device having a hermetically sealed interior, a projecting portion projecting inward of the casing is formed on the bottom surface portion of the lid at a position facing the conductive path, and the projecting portion is formed. Since the lid is preliminarily bent by providing the convex portion, the rigidity of the lid can be reduced, and the lid can be easily bent with respect to external pressure.

Further, in the above-mentioned protective device in which the inside is hermetically sealed and the casing and the lid are electrically connected by the conductive path, a conductive foil is provided on each of the casing and the lid to electrically connect the casing and the lid. By using the metal foil as the external lead terminal of the conductive path, connection with an external device can be facilitated. Further, in the above-mentioned protective device in which the inside is hermetically sealed and the pair of wiring members are extended to the outside, the conductive paths form electrodes on the surface of the ceramic substrate, so that the lid body is protected from external pressure. Due to the bending, the protrusion provided on the lid can break the conductive path.

Further, in the above-mentioned protective device in which the inside is hermetically sealed and the pair of wiring members are extended to the outside, by providing the conductive path and the pair of wiring members integrally, the number of parts and the manufacturing process are reduced. Can be reduced.
Further, a protection device is provided inside the storage battery, the inside of which is hermetically sealed so that the casing and the lid are electrically connected by the conductive path, and the internal electrode and the external electrode of the storage battery are connected to the casing and the lid. Then, by conducting between the internal electrode and the external electrode via the conductive path, the pressure rise in the storage battery is received as an external pressure and the lid is bent, whereby the conductive path is broken. The electrical connection between the internal electrode and the external electrode can be cut off.

Further, a protective device having the above-mentioned interior sealed and the pair of wiring members extended to the outside is provided in the storage battery, and the pair of wiring members is connected to the internal electrode and the external electrode of the storage battery, By electrically connecting the internal electrode and the external electrode via the conductive path, the pressure increase in the storage battery is received as an external pressure and the lid body is bent, whereby the conductive path is broken and the internal electrode is broken. The electrical connection between the external electrode and the external electrode can be cut off.

As a result, the rise in atmospheric pressure in the storage battery is evenly transmitted to the storage battery, so that the protection device can be provided at any location in the storage battery, and the degree of freedom in designing the storage battery can be improved. Further, by incorporating the above-mentioned protective device whose inside is sealed in the storage battery, it is possible to provide a protection device that can reliably stop the use of the storage battery whose internal atmospheric pressure has risen, and a storage battery provided with the protection device.

[Brief description of drawings]

FIG. 1 is a perspective view of a protection device according to a first embodiment of the present invention.

FIG. 2 is an enlarged side view of a conductive path which is a component of the protection device according to the first embodiment of the present invention.

FIG. 3 is an enlarged perspective view of the holding member, which is a component of the protection device according to the first embodiment of the present invention, as viewed from the back side.

FIG. 4 is a longitudinal sectional view of a protection device according to a first embodiment of the present invention.

5A and 5B are cross-sectional views taken along the lateral direction of the protective device according to the first embodiment of the present invention, in which FIG. 5A is a view taken at the center thereof, and FIG. 5B is a view taken at the ends. .

FIG. 6 is a schematic sectional view of a storage battery to which the protection device according to the first embodiment of the present invention is attached.

FIG. 7 is a sectional view showing a state in which a conductive path of the protection device according to the first embodiment of the present invention is broken.

FIG. 8 is a partially enlarged view of the protection device according to the first embodiment of the present invention, showing a state in which the conductive paths are flattened due to the pressure drop in the storage battery after the conductive paths are broken.

FIG. 9 is a partially enlarged view showing a state where a conductive path is broken in the protective device according to the first embodiment of the present invention in which a step of the conductive path step forming means is provided.

FIG. 10 is a partially enlarged view for explaining the reason why a step is provided in the recess of the casing of the protection device according to the first exemplary embodiment of the present invention.

FIG. 11 is a partially enlarged view illustrating another method of providing a step in the recess of the casing of the protection device according to the first exemplary embodiment of the present invention.

FIG. 12 is a partial enlarged view for explaining another shape of the step forming means provided in the recess of the casing of the protection device according to the tenth example of the present invention. .

FIG. 13 is a longitudinal sectional view of a protection device according to a second embodiment of the present invention.

FIG. 14 is an enlarged perspective view of the casing, which is a component of the protection device according to the second embodiment of the present invention, as seen from the back surface thereof.

FIG. 15 is a perspective view of a protection device according to a third embodiment of the present invention.

FIG. 16 is a longitudinal sectional view of a protection device according to a third embodiment of the present invention.

FIG. 17 is a cross-sectional view of the protection device according to the third embodiment of the present invention, taken along its widthwise direction at the center thereof.

FIG. 18 is a perspective view of a protection device according to a fourth embodiment of the present invention.

FIG. 19 is an enlarged perspective view of the holding member, which is a component of the protection device according to the fourth embodiment of the present invention, as viewed from the back surface.

FIG. 20 is a longitudinal sectional view of a protection device according to a fourth embodiment of the present invention.

FIG. 21 is a lateral cross-sectional view of a protection device according to a fourth embodiment of the present invention, FIG.
(B) is a view cut at the center, and (C) is a view cut at the other end.

FIG. 22 is a perspective view of a protection device according to a fifth embodiment of the present invention.

FIG. 23 is an enlarged top view of the holding member, which is a component of the protection device according to the fifth embodiment of the present invention, as seen from above.

FIG. 24 is a longitudinal sectional view of a protection device according to a fifth embodiment of the present invention.

FIG. 25 is a cross-sectional view of the protection device according to the fifth embodiment of the present invention taken along the widthwise direction at the center.

[Explanation of symbols]

1 protection device 2 housing 5 conductive paths 9 Holding member 12 Lid 18 convex 19,20 Conductive foil 15-17 convex part 22 Positive lid 23 Positive electrode 27 housing 28 Second conductive path 34,35 wiring members 36 Conductive path 39 Lid 43 convex 44 housing 48 holding member 50 Conductive wiring path 51 lid 55 Breaking protrusion 56 housing 59 holding member 64,65 wiring member 66 Lid 72 Projection 74 Convex part 75 case 79 holding member 87 Lid 90 convex 91,92 Conductive foil

Claims (9)

(57) [Claims] 1. A housing having a hollow interior having conductivity, and
The conductive paths stored in the housing and the conductive paths stored in the housing.
Holding the conductive path with elasticity and insulation
Consisting of a member and a lid having flexibility and conductivity,
The lid has a hollow inside so that the inside of the casing is sealed.
While being connected to the housing via the holding member,
The conductive path is sandwiched between the recording cover and the housing, and the conductive path is formed.
To bring the casing and the lid into conduction,
Is a position facing the central portion including the central portion of the conductive path.
Is provided with a convex portion in contact with the conductive path, and
Causes a step in the broken conductive path due to the bending of the lid.
The conductive path step forming means for causing provided by flexing of the front Kifuta body by external pressure, causing a step wherein the convex portion is broken the conductive path, between the lid and the housing A protective device characterized in that the conduction is cut off. 2. An insulative housing having a hollow interior, and
Before connecting the conductive path stored in the housing and the conductive path
A pair of wiring members electrically connected through the conductive path, and the casing
Elasticity and insulation that are housed inside to hold the conductive path
Holding member having a lid and a lid having flexibility and insulation
And the lid is in a state where the hollow inside of the housing is hermetically sealed.
To the housing via the holding member so that
In addition, the conductive path is sandwiched between the lid body and the housing.
The wiring member to the housing, the holding member, and the lid.
Extend it out of the space enclosed by
The conductor is placed at a position facing the central part including the central part of the electric circuit.
The projection is provided by making contact with the electric path, and the lid is attached to the housing.
Caused by the bending of the conductive path
It provided a conductive path step forming means because, due to deflection of the front Kifuta <br/> body by external pressure, the convex portion is broken the conductive path level difference
The protection device is characterized in that the electrical connection between the pair of wiring members is interrupted. 3. A conductive path step forming means provided on the casing.
Is provided on the ceiling surface inside the hollow of the casing, and
The position of the step forming means is a position facing the convex portion of the lid body.
From claim 1, characterized in that provided at a position displaced or
Or the protection device according to 2 . 4. The bottom surface of the lid body faces the conductive path.
A protruding portion that protrudes inward of the housing is formed at a position where
Claim, characterized in that the projecting portion provided with the convex portion 1
Or the protection device according to 2 . 5. A conductive foil is provided on each of the housing and the lid.
To establish conduction, and to draw the conductive foil out of the conductive path.
The protective device according to claim 1 , wherein the protective device is a terminal.
Place 6. The conductive path is electrically connected to the surface of the ceramic substrate.
The device according to claim 1 or 2, characterized in that by forming a pole. 7. The conductive path is electrically connected to the pair of wiring members.
The protection device according to claim 2 , wherein the protection device is formed of a plate, and these are integrally provided. 8. A housing having a hollow interior having conductivity, and
The conductive paths stored in the housing and the conductive paths stored in the housing.
Holding the conductive path with elasticity and insulation
Consisting of a member and a lid having flexibility and conductivity,
The lid has a hollow inside so that the inside of the casing is sealed.
While being connected to the housing via the holding member,
The conductive path is sandwiched between the recording cover and the housing, and the conductive path is formed.
To bring the casing and the lid into conduction,
Is a position facing the central portion including the central portion of the conductive path.
Is provided with a convex portion in contact with the conductive path, and
Causes a step in the broken conductive path due to the bending of the lid.
A means for forming a step in the conductive path is provided to generate external pressure.
Due to the bending of the lid body caused by the
It breaks to create a step, which causes a gap between the housing and the lid.
Providing a protective device in the storage battery that cuts off the conduction,
The internal electrode and the external electrode of the storage battery are connected to the housing and the lid.
Connected to the internal electrode and the external via the conductive path.
A storage battery characterized in that the electrodes are electrically connected . 9. A housing having a hollow interior having an insulating property, and
Before connecting the conductive path stored in the housing and the conductive path
A pair of wiring members electrically connected through the conductive path, and the casing
Elasticity and insulation that are housed inside to hold the conductive path
Holding member having a lid and a lid having flexibility and insulation
And the lid is in a state where the hollow inside of the housing is hermetically sealed.
To the housing via the holding member so that
In addition, the conductive path is sandwiched between the lid body and the housing.
The wiring member to the housing, the holding member, and the lid.
Extend it out of the space enclosed by
The conductor is placed at a position facing the central part including the central part of the electric circuit.
The projection is provided by making contact with the electric path, and the lid is attached to the housing.
Caused by the bending of the conductive path
Is provided with a conductive path step forming means for
Due to the bending of the body, the convex portion breaks the conductive path and a step is formed.
To prevent the conduction between the pair of wiring members.
Install a protective device like this in the storage battery, and
Connect the internal and external electrodes of the storage battery, and connect the conductive path.
A storage battery , characterized in that conduction is established between the internal electrode and the external electrode via a storage battery .