JP2001338634A - Battery having pressure-sensitive circuit breaker mechanism and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery having a pressure-sensitive circuit breaker mechanism which is thin, compact and easy to install, utilizing the space at the outer package body sealing portion which is made thinner than the generating body built-in portion of the outer package body. SOLUTION: The functioning member 6 and the fixed member comprises a functioning piece portion 6a, which is the end portion located at the outer package body sealing portion 4 side, and an opposing portion 7b of the sealing portion. The thickness of the plate of the functioning piece portion 6a and the opposing portion 7b is made thicker than other end portions 6d, 7a located at the outside face of the outer package body 1 having the generating body built-in. Thus, the displacement of one end portion 6d can be transmitted steadily to the other end functioning piece portion 6a and a high performance pressure- sensitive circuit breaker mechanism is provided.

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 a battery, and more particularly to a battery having a pressure-sensitive current interrupting mechanism suitable for a lithium polymer secondary battery.

[0002]

2. Description of the Related Art Equipment such as a cellular phone and a video tape recorder integrated with a camera is required to be small and thin.
Similar demands have been made for batteries used in these devices. As such a small and thin battery, a lithium polymer secondary battery is particularly taken up as a promising candidate.

[0003] When charging such a lithium polymer secondary battery, there is an unusual usage in which charging is further performed even after the charging is completed, or charging is performed with a current larger than a specified current. Then, a chemical change occurs in the lithium polymer secondary battery, gas is generated, and the internal pressure of the battery increases. Then, there is a possibility that the outer package surrounding the lithium polymer secondary battery expands, and the outer package is cracked or ruptured, or the temperature of the battery becomes high, which adversely affects the surroundings. Therefore, a current interrupting element for a battery has been proposed which cuts off an electric path between a power generator inside the battery and an external lead attached to an exterior body when the internal pressure of the battery rises above a predetermined value.

[0004] Such a conventional battery current interrupting element is
For example, an explosion-proof valve that expands outward due to an increase in the internal pressure of the battery is provided in the metal can of the battery. When the explosion-proof valve expands outward, the external lead is separated from the internal electrode and the electric circuit is cut off. There are things that are. Another conventional example is for a rectangular battery, in which a diaphragm, a current interrupting element using the same, a safety valve, or the like is incorporated in a plate surface (wide surface) of the battery near an external electrode.

[0005]

However, the lithium polymer secondary batteries used in recent years are plate-shaped and the outer package is applied by film lamination, and the thickness of the battery body is extremely thin, about 1 to 4 mm. Is formed. For this reason, in this type of thin secondary battery, the conventional current interrupting means including a diaphragm or the like cannot secure a space for incorporating the size of the diaphragm, has no fixing method, and is difficult to incorporate. There was a problem.

However, simply attaching a current interrupting means using a diaphragm to the side surface of the battery exterior body having a large area increases the thickness of the entire battery and makes it impossible to make use of the characteristic of thinness. The present invention has been made in view of the above-described problems, and utilizes an empty space of an exterior body sealing portion formed thinner than a portion in which a power generation body of the exterior body is built in, and is thin and compact. It is another object of the present invention to provide a battery having a pressure-sensitive current interrupting mechanism that is easy to attach.

[0007]

According to a first aspect of the present invention, there is provided a pressure-sensitive current interruption mechanism according to the present invention.
A plate-shaped exterior body having a confidentiality that has a power generator built therein and can be deformed by an internal pressure change, a plurality of extraction terminals serving as electric paths from the power generator to the outside of the exterior body, and the power generator built therein. An exterior body sealing portion formed to be thinner than the thickness of the portion and extending in the direction of the end surface of the exterior body to form a part of the exterior body; and an interruption means capable of interrupting the electric circuit. An operating member which is on the outside of the body, at least one end of which is disposed on the upper surface or the lower surface of the exterior body of the portion in which the power generator is built, and the one end is displaced outward with an increase in the internal pressure of the exterior body, At least one end of the fixed member is located on the opposite side of the operating member with respect to the portion incorporating the power generator, and is located at the portion where the exterior body seal is formed, and is fixed to the fixed member. Insulating An element having a conductive path that is held by the holding member, one end of which is electrically connected to at least one of the extraction terminals, and the other end of which is electrically connected to an external electrode; The member and the fixing member form the other end located on the side of the exterior body sealing portion, respectively, and the operating member and / or the fixing member are
The thickness of the other end was made thicker than the one end.

According to a second aspect of the present invention, the thickness of the other end of the actuating member and / or the fixing member is increased on the side facing the exterior body sealing portion. The configuration was as follows.

As a third means for solving the above-mentioned problem, the operating member and the fixing member are integrally formed.

According to a fourth aspect of the present invention, the operating member includes a seesaw near a root portion of the other end extending in parallel with the outer package sealing portion. Form a fulcrum for performing the operation, engage this fulcrum with the holding member, when the one end of the operating member is displaced outward, the other end is displaced inward,
The element was configured to be broken.

As a fifth means for solving the above-mentioned problems, a plate-like exterior body having a power generator incorporated therein, an exterior seal part forming a part of the exterior body, and the power generator are provided. And an electric circuit interrupting means capable of interrupting an electric circuit from the outside of the exterior body to the exterior of the exterior body. An actuating member located on the upper or lower surface of the body,
One end of which is located on the opposite side of the actuating member with respect to the portion incorporating the power generator, and the insulating member which is located on the portion where the exterior body seal is formed, and which is fixed to the fixing member. And an element having the electrical path formed therein and held by the holding member, wherein the operating member and the fixing member are respectively formed with the other end portions located on the side of the exterior body sealing portion. The operating member and / or the fixing member are manufactured by cold rolling to make the one end part thinner than the other end part.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, one embodiment of the present invention is shown in FIG.
This will be described with reference to FIG. FIG. 1 is a perspective view of a battery having a pressure-sensitive current interrupting mechanism according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a part of the pressure-sensitive current interrupting mechanism when cut off from above. 3 is a longitudinal sectional view of FIG. 2, FIG. 4 is an exploded perspective view of a battery having a pressure-sensitive current cutoff mechanism according to the present invention, and FIG. 5 is a view after operation of the pressure-sensitive current cutoff mechanism of FIG. It is explanatory drawing which shows a state. In FIG. 2, the upper half of the figure is shown with the operating member 6 removed, and the lower half of the figure is shown transparently through the exterior body (power generation body) 1.

First, the exterior body 1 has a built-in plate-like power generator (not shown) composed of a power generation element, is formed of a flexible member such as a laminate film, and has a closed interior and an outer shape. It is plate-shaped and can be deformed by changes in internal pressure.
In addition, a plurality of extraction terminals 2, 3 serving as electric paths from the power generator to the outside of the exterior body 1 are formed on the surface of the exterior body seal portion 4. The exterior body sealing portion 4 extends in the direction of the end surface of the exterior body 1 to form a part of the exterior body 1 and is formed to be thinner than the thickness T of the portion in which the power generator is built. 1 is hermetically sealed.

In a space portion on the upper surface of the exterior body sealing portion 4, there is provided an electric circuit interrupting means 5 capable of interrupting an electric circuit formed between the power generator and the terminals 2 and 3. As shown in FIG. 3, the electric circuit interrupting means 5 is outside the exterior body 1, and at least one end 6 d is on the upper surface (or lower surface) of the exterior body 1 where the power generator is built. An operating member 6 that is displaced outward due to an increase in the internal pressure of the body 1, a fixing member 7 whose at least one end 7b is located on the opposite side of the operating member 6 across a portion including the power generator, and an exterior body sealing portion The insulating holding member 8 fixed to the fixing member 7 and located at the portion where the
A conductive path (not shown) held by the holding member 8 and having one end electrically connected to at least one of the extraction terminals 2 and 3 and the other end electrically connected to an external electrode is formed of a brittle material. And an element 9 formed on a ceramic substrate.

As shown in FIGS. 1 to 4, the holding member 8 has a plate-like substrate portion 8a. Fitting grooves 8b, 8b with a width D facing each other are formed to protrude upward from the left and right ends in the drawing of the substrate portion 8a and can fit fitting plates 7d, 7d of the fixing member 7 described later. A pair of fitting pieces 8c are provided. Further, an element housing portion 8d in which the back side in the drawing of the substrate portion 8a is notched, and a first notch portion 8e in which the narrow portions 7e of the fixing member 7 are slidable when the holding member 8 is attached to the fixing member 7. , 8e
And second notches 8f, 8f in which the bending roots of the engagement pieces 6c, 6c of the operating member 6 are slidable. An engagement piece 8g adjacent to the second notch 8f and engageable with an engagement piece 6c of the operating member 6 described below;
The holding member 8 is constituted by a receiving stand 8h protruding between the notches 8f, 8f and capable of receiving the back surface of the operating member 6. When the internal pressure of the battery rises and the exterior body 1 is deformed, such a holding member 8 performs a seesaw operation with the engagement pieces 6c, 6c of the operating member 6 engaged with the engagement pieces 8g, 8g as fulcrums. As a result, the operating piece 6a of the operating member 6 is turned downward and displaced.

As shown in FIG. 4, one end of a lead plate 10 constituting an electric path is protruded from the opposing side surface of the element housing portion 8d of the holding member 8 so as to oppose each other. The two ends of the element 9 are mounted on the upper surfaces of the one ends of the lead plates 10 and 10, respectively, and are electrically connected by a conductive adhesive or the like. The lead plates 10 and 10 are buried in the substrate portion 8a of the holding member 8 by insert molding or the like, and the other ends thereof are formed in the substrate portion 8a.
From the outside. On the upper surface of the element 9, a projection 6b formed on an operation piece 6a of the operation member 6 described later is located.

As shown in FIG. 4, the fixing member 7 has at least one end 7 a that is an operating member 6.
Is formed at a position facing one end 6d of the
A seal portion facing portion 7b, which is the other end portion of the fixing member 7, is formed so as to extend from FIG. The sealing portion opposing portion 7b, which is the other end portion, can position the exterior body sealing portion 4, and its end portion is bent upward in the U-shape from the bent portion 7c to form a step-like shape on the upper side in the drawing. Are integrated with the operating member 6 at the connecting portion 12 of the first member. Then, the end portion 6d and 7a of the operating member 6 and the fixing member 7 which are bent and integrated into a U-shape respectively hold the exterior body 1 of the portion in which the power generator is built. That is, the fixing member 7 has a flat shape in which the lower surface side of the portion of the exterior body 1 in which the power generator is built abuts on the lower side in the figure and can be displaced outward with the swelling of the exterior body 1 due to the displacement of the power generator. Sealing portion facing portions 7b, 7b are formed above and below the one end portion 7a and the portion where the exterior body sealing portion 4 is formed.
And is integrated with the operating member 6.

The fixing member 7 is, as shown in FIG.
The plate thickness of the sealing portion opposing portions 7b, 7b is formed to be thicker than the one end portion 7a. Also, the plate thickness of the bent portion 7c is formed to the same thickness as the seal portion facing portion 7b. The plate thickness of the sealing portion facing portion 7b, which is the other end portion of the fixing member 7, is formed thicker on the surface side facing the exterior body sealing portion 4. That is, the plate thickness of the sealing portion facing portion 7b is the same as that of the one end portion 7a on the surface side located outside, and only the inside surface side facing the exterior body sealing portion 4 is thickened. Height dimension H
Can be increased without changing the thickness of the sealing portion facing portion 7b, which is the other end portion.

In the manufacturing method in which the one end 7a is made thinner than the seal portion facing portion 7b, the one end 7a is compressed and thinned by cold rolling before the fixing member 7 is bent from the bent portion 7c. This cold rolling is performed at one end 7a.
Is rolled by a roller, or one end 7a is formed by beating out flat by a press or the like. Therefore, one end 7a is
Work hardening is performed so that the strength is substantially the same as that of the seal portion facing portion 7b having a large plate thickness.

Further, fitting plate portions 7d, 7d are formed on both sides of the width B of the sealing portion facing portion 7b on the upper side in the drawing near the bent portion 7c of the fixing member 7, and this fitting plate portion 7d is formed.
The width B of the portion where d and 7d are formed is wider than the width C of the operating member 6. Then, the fitting plate 7
d and 7d are inserted and fitted into the fitting grooves 8b and 8b of the holding member 8 formed with the width dimension D.

The operating member 6 is, as shown in FIG.
A tongue-shaped acting piece 6 is attached to the other end in the opposite direction to the one end 6d.
The action piece 6a is formed by cutting out the seal opposing portion 7c in the upper part of the fixing member 7 in the figure and connecting it to one end 6d. The action piece 6a is bent downward in a stepwise manner near the tip, and a projection 6b protruding downward is formed substantially at the center of the action piece 6a. The projection 6b is positioned so as to abut on a central portion of the element 9 described later.
Thus, even with a thin battery, with a small displacement of the exterior body 1,
The one end portion 6d is displaced upward, and the action piece portion 6a is displaced inwardly downward, so that the element 9 is reliably broken at the projection portion 6b to cut off the current flowing through the power generator.

A pair of engaging pieces as fulcrums for the operating member 6 to perform a seesaw operation are formed on both sides near the one end 6d of the working piece 6a by bending it downward in an L-shape. 6c, 6c are formed outward. The pair of engagement pieces 6c, 6c are used as the engagement pieces 8g of the holding member 8,
It is designed to be supported on the lower surface side of 8 g.
When the one end 6d is displaced upward and outward in the drawing, the operating member 6 in which the engagement piece 6c is supported by the engagement piece 8g of the holding member 8 uses the engagement pieces 6c, 6c as fulcrums as fulcrums. The action piece 6a, which is the other end, is displaced inward and downward to perform a seesaw operation.

The operating member 6 is formed such that the plate thickness of the action piece 6a is larger than that of the one end 6d. The one end 6d
The processing method for reducing the thickness of the fixing member 7 is described above.
Since this is the same as reducing a, the description is omitted. As shown in FIG. 5, when the internal pressure of the exterior body 1 rises and the upper surface of the exterior body 1 is displaced above the arrow F, as shown in FIG.
The element 9 can be reliably broken by the action piece 6a having a large plate thickness.

As described above, the operating member 6 and the fixing member 7 are
One long plate is cold-rolled to form one end 6d, 7a thinner than the other end, and then bent from the bent portion 7c to be integrally formed, so that handling is easy. Thus, the battery can be easily attached to the exterior body 1. The actuating member 6 (acting piece 6a)
A contact portion 6e is formed at a portion (indicated by a dashed line in FIG. 4) connecting between the engagement pieces 6c on the back surface of the contact portion 6e.
Even if a force in the direction of the plate surface of the operating member 6 (from top to bottom in FIG. 3) is applied from the outside, the base 8h receives this external force.
The element 9 is hardly broken.

The tail holding member 8 holding the element 9 is installed between the fixing member 7 to which the holding member 8 is fixed, the operating member 6 and the fixing member 7 so as to hold the thin plate-like exterior body 1 therebetween. Is easier to assemble, and the positional accuracy between the element 9 and the operating piece 6a of the operating member 6 is easier to obtain, as compared with a case in which the element 9 is directly adhered to the exterior body sealing portion 4 with an adhesive or the like.
In addition, there is no influence of the adhesive or the like (for example, a change in the adhesive strength with time or a change with time, a generated gas, a variation in the adhesive thickness, etc.). Also, when the internal pressure of the battery rises and the exterior body 1 expands,
Even if it does not always expand to the same shape,
Can perform a seesaw operation with the engagement pieces 6c, 6c as fulcrums. Therefore, the posture of the operation member 6 is stable, and the operation pressure applied to the element 9 can be stabilized.

Further, since the operating member 6 and the fixing member 7 are integrated at the connecting portion 12, the number of parts can be reduced, the handling is easy, and the assembling process can be simplified.
Also, the operating piece 6a, which is the other end of the operating member 6, which extends in the direction parallel to the outer package seal portion 4 of the outer package 1, and the seal facing portion 7b, which is the other end of the fixing member 7, are connected to one end. Since it is formed thicker than the portions 6d and 7a, even if the plate thickness of the element 9 varies, the element 9 can be reliably broken at the operating piece portion 6a at the other end. Also, since each of the one end portions 6d and 7a is formed thin by cold rolling, it is work-hardened, and the displacement of the exterior body 1 can be reliably transmitted to the action piece portion 6a which is the other end portion. Can be.

Next, assembly of the operating member 6, the fixing member 7, and the holding member 8 will be described. First, as shown in FIG. 4, the element 9 is placed on the lead plates 10 and 10 of the holding member 8.
Is mounted, and the element 9 is attached to the lead plate 10 with a conductive adhesive or the like. Next, one end 6 d of the operating member 6 integrally formed with the fixing member 7 is positioned on the substrate 8 a of the holding member 8. Then, the fitting plate portions 6d, 6d of the operating member 6
Is fitted between the fitting grooves 8b of the holding member 8 and slid. Then, the narrow portions 7e and 7 of the fixing member 7
e passes through the first notches 8e, 8e of the holding member 8. Next, the engaging pieces 6c, 6c of the operating member 6 are inserted into the second notches 8f, 8f, and the engaging pieces 6c, 6c are located on the lower surface side of the engaging piece 8g of the holding member 8.

At the same time, the side surface of the holding member 8 on the far left side in FIG. 4 abuts on the bent portion 7c of the fixing member 7 to complete the assembly. The operating member 6, the fixing member 7, and the holding member 8 assembled as described above are incorporated so as to further sandwich the thin-plate-shaped exterior body 1, and the takeout terminal 2 is folded back to be connected and fixed to one of the lead plates 10. Thus, the battery having the pressure-sensitive current cutoff mechanism of the present invention shown in FIGS. 1 to 3 can be obtained.

Next, the operation of the pressure-sensitive current interrupting mechanism will be described with reference to FIGS. 3 and 5. From the state shown in FIG. 3, the charging proceeds and becomes overcharged or at a current larger than the specified current. When charging is performed, gas is generated and filled by a chemical change of the internal power generator, and the gas starts to increase the internal pressure in the exterior body 1 due to the gas. Due to the increase in the internal pressure of the exterior body 1,
The upper surface of the exterior body 1 is expanded and displaced outward in the upper part of the figure. Thereby, the one end 6d of the operating member 6 positioned in close contact with the upper surface of the exterior body 1 is also displaced upward.

Then, the operating member 6 performs a seesaw operation with the mating pieces 6c, 6c engaged with the engaging pieces 8g of the holding member 8 as fulcrums, and the action piece 6a, which is the other end of the operating member 6, is moved. It is displaced inward as shown below. Then, as shown in FIG. 5, when the action piece 6a is displaced downward by a predetermined amount or more, the projection 6b of the action piece 6a pushes down the element 9 and breaks the element 9 from the center. As a result, the conductive path (not shown) formed in the element 9 is broken and the conduction between the lead plates 10 and 10 is cut off, so that further charging of the power generator can be stopped. .

In the description of the embodiment of the present invention, one end 6 d of the operating member 6 is attached to the upper surface of the exterior body 1,
Has been described with the one end 7a positioned on the lower surface of the outer package 1, but the same effect can be obtained with the one in which the operating member 6 is positioned on the lower surface of the outer package 1 and the fixing member 8 is positioned on the upper surface of the outer package. be able to. That is, the operating member 6 has at least one end 6d on the upper surface or the lower surface of the exterior body 1 of the portion in which the power generator is built, and the fixing member 7 has at least one end 7a of the exterior of the portion in which the power generator is built. The fixing member 7 may be located on the opposite side of the operating member 6 with the body 1 interposed therebetween.

As described above, when the exterior body 1 is displaced upward in the drawing due to a change in the internal pressure of the battery, the one end 6d of the operating member 6 is displaced upward and outward. And one end 6d
Is displaced upward by a predetermined amount or more, the action piece 6a, which is the other end formed to be thicker than the one end 6d,
It is displaced inward in the lower part of the figure with c and 6c as fulcrums. For this reason, even if the plate thickness of the element 9 varies, the element 9 can be reliably broken by the thick acting piece portion 6a. Further, since the holding member 8 holding the element 9 is attached to the fixing member 7 in the empty space portion of the exterior body sealing portion 4, the battery having the pressure-sensitive current cutoff mechanism can be made thin and compact.

Further, in the description of the embodiment of the present invention, the thickness of the other end of the operating member 6 and the fixing member 7 located in the extending direction of the outer package sealing portion 4 is set to one end 6d, 7
Although the description has been made on the assumption that the thickness is larger than b, the plate thickness of the other end of only the operating member 6 or only the fixing member 7 may be increased. That is, the operating member and / or the fixing member 7 may be formed such that the thickness of the other end located in the extending direction of the exterior body sealing portion 4 is greater than the thickness of the one end 6d, 7b.

[0034]

As described above, according to the present invention,
Since the operating member and / or the fixing member have a greater thickness at the other end on the side where the element is located, even if the thickness of the element varies, the operating piece at the other end formed thicker. The element can be reliably broken at the portion, and a battery having a high-performance pressure-sensitive current interrupting mechanism can be provided.

Further, the operating member and / or the fixing member have a plate thickness at the other end portion that is thicker on the surface side facing the outer package sealing portion, so that the empty space of the outer package sealing portion is utilized. The plate thickness at the other end can be increased. Therefore, it is possible to increase the thickness of the other end side without changing the overall thickness dimension, and it is possible to provide a battery having a thin and high-performance pressure-sensitive current interrupting mechanism.

The operating member and the fixed member are
Since they are integrally formed, handling during assembly is easy and the number of parts can be reduced.

Further, the operating member forms a fulcrum near the base of the other end extending in parallel with the outer package sealing portion for the operating member to perform a seesaw operation. Is engaged with the holding member, and when the one end of the operating member is displaced outward, the other end is displaced inward, so that the element is broken, so that the operating member is securely held at the fulcrum. The seesaw operation can be performed, and even if the internal pressure of the exterior body is low and the displacement of one end is small, the other end can be reliably displaced in the opposite direction to the one end. Therefore, a battery having a high-performance pressure-sensitive current interrupting mechanism can be provided.

Further, in the manufacturing method of the present invention, the working member and / or the fixing member have one end thinner than the other end by cold rolling. Therefore, the thinned one end is formed by cold rolling. Work hardening can increase the strength. As a result, the strength of the other end having a large thickness and that of the one end having a small thickness can be made substantially the same, and the displacement of one end can be reliably transmitted to the other end. It is possible to provide a method for manufacturing a battery having a voltage / current interruption mechanism.

[Brief description of the drawings]

FIG. 1 is a perspective view of a battery having a sensing current interruption mechanism according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a pressure-sensitive current interrupting mechanism part partially cut away when viewed from above.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is an exploded perspective view of a battery having a pressure-sensitive current cutoff mechanism according to the present invention.

FIG. 5 is an explanatory diagram showing a state after the pressure-sensitive current cutoff mechanism of FIG. 3 is operated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer body 2, 3 Take-out terminal 4 Outer body seal part 5 Blocking part 5 6 Operating member 6a Working piece part 6b Projection part 6c Engaging piece part 6d One end 6e Contact part 7 Fixed member 7a One end 7b Seal part opposing part 7c Bending part 7d Fitting plate part 7e Narrow width part 8 Holding member 8b Fitting groove part 8c Fitting piece part 8d Element storage part 8g Engaging piece part 8h Receiving stand 9 Element 10 Lead plate 12 Connection part

Claims (5)

[Claims] A plate-shaped exterior body having a power generator built therein and having a secrecy that can be deformed by a change in internal pressure; a plurality of extraction terminals serving as an electric path from the power generator to the outside of the exterior body; An exterior body sealing portion which is formed to be thinner than a thickness of a portion in which the power generating body is built and extends in an end surface direction of the exterior body to form a part of the exterior body; The means is located outside the exterior body, and at least one end thereof is located on the upper surface or the lower surface of the exterior body in a portion in which the power generator is built, and the one end is displaced outward with an increase in the internal pressure of the exterior body. An operating member, and a fixing member at least one end of which is located on the opposite side of the operating member with respect to a portion incorporating the power generator,
An insulating holding member fixed to the fixing member, and one end held by the holding member, one end of which is electrically connected to at least one of the extraction terminals; Has an element having a conductive path the other end of which is electrically connected to an external electrode, and the operating member and the fixing member form the other end located on the exterior body seal portion side, respectively. The operating member or /
A battery having a pressure-sensitive current interrupting mechanism, wherein the fixing member has a plate thickness at the other end portion greater than that at the one end portion. 2. The pressure-sensitive current according to claim 1, wherein the plate thickness of the other end portion of the operating member and / or the fixing member is thicker on a surface side facing the outer package sealing portion. A battery having a shut-off mechanism. 3. The battery according to claim 1, wherein the operating member and the fixing member are integrally formed. 4. The operating member forms a fulcrum near the base of the other end extending in parallel with the exterior body sealing portion for the operating member to perform a seesaw operation. Is engaged with the holding member, and when the one end of the operating member is displaced outward, the other end is displaced inward,
4. A battery having a pressure-sensitive current interrupting mechanism according to claim 1, wherein the element is broken. 5. A plate-like exterior body having a power generator incorporated therein, an exterior seal part forming a part of the exterior body, and an electric circuit capable of cutting off an electric path from the power generator to the outside of the exterior body. An operating member having a cutoff means, the electric circuit cutoff means being located outside the exterior body, one end of which is located on the upper surface or the lower surface of the exterior body in a portion where the power generator is built in,
One end of which is located on the opposite side of the actuating member with respect to the portion incorporating the power generator, and the insulating member which is located on the portion where the exterior body seal is formed, and which is fixed to the fixing member. And an element having the electrical path formed therein and held by the holding member, wherein the operating member and the fixing member are respectively formed with the other end portions located on the side of the exterior body sealing portion. A method for manufacturing a battery having a pressure-sensitive current interrupting mechanism, wherein the one end of the operating member and / or the fixing member is made thinner than the other end by cold rolling.