TWI549154B - Protection device, electrical device, secondary battery cell and washer - Google Patents

Description

Protective device, electrical device, secondary battery unit and gasket

The present invention relates to a protective device for protecting an electrical device, and more particularly to a protective device that protects an electrical element or circuit contained in the electrical device. For example, in the case of a secondary battery-like electrical device, in the case where an excess current flows, a protection device that breaks the flow of the current, that is, an overcurrent protective element ).

In the case of charging or discharging a cylindrical lithium ion secondary battery, there is a case where an excessive current flows, and as a protection device for breaking the flow of the current, a temperature melting element, a current melting element, a polymer PTC element, or the like is used. . Among them, since the polymer PTC element can be disposed by being attached to the sealing plate of the secondary battery, it is quite useful from the viewpoint that the battery pack composed of many secondary batteries becomes compact.

However, commercially available PTC components cannot be energized with a large current (for example, a current of 20 A). Further, when the abnormality is excluded and the temperature is lowered, the PTC element has a resettability which is low in resistance, but such a regression property may cause problems due to use. For example, in the case of a cylindrical lithium ion secondary battery cell used in multiple parallel connection, in the case of using a PTC element, the battery cell continues to heat up as long as the short-circuited battery unit using the PTC element is not removed. As a result, there is a possibility that the battery unit will rupture.

In view of such a problem, in the case of a cylindrical lithium ion secondary battery unit, for example, a spacer is used instead of the PTC element inside the sealing plate (see Non-Patent Document 1 below). However, in the case of using a spacer, it is considered that there is a problem that protection against excess current cannot be ensured.

[Previous Technical Literature] [Non-patent literature]

[Non-Patent Document 1] Matsushita Technical Journal Vol.52 No.4

Accordingly, the problem to be solved by the present invention is to provide a protection device that can flow a large current while providing protection against excess current.

In a first aspect, the present invention provides a protective device comprising: a layered member formed of an insulating resin and having at least one through opening; and a conductive metal thin layer located in the layered member And a fuse layer located at a side of the side surface defining the at least one through opening, and electrically connecting the conductive metal thin layer.

In a second aspect, the present invention provides an electric device, such as a secondary battery, having the above-described protective device of the present invention as described later. More specifically, a secondary battery unit or a secondary battery pack in which a secondary battery unit is combined is provided.

The protective device of the present invention has a layered element formed of an insulating resin, and the layered element has at least one through opening. The opening portion extends in the thickness direction of the layered element, and the cross-sectional shape of the layer-shaped element penetrating the direction perpendicular to the thickness direction is not particularly limited, but is preferably, for example, a circular shape. In this case, the through opening portion is a columnar space portion. However, other shapes such as a square, a diamond, a rectangle, and an ellipse may also be used. The number of through openings is at least one. That is, one or two or more, for example, two, three, four, or five, and may be appropriately selected depending on the degree of protection required by the protective device. In the case of having one through-opening, the through-opening is preferably located at the center of the layered element, and more preferably, it is located at the center of the cross-sectional shape perpendicular to the thickness direction.

The insulating resin constituting the layered element is a tree having electrical insulation properties The fat is not particularly limited. A resin such as polyethylene, polypropylene, polycarbonate, or a fluorine-based resin can be exemplified. It is particularly preferable to use a polyethylene or a polyvinylidene fluoride-like resin having the same flexibility as the polymer used for the polymer PTC element, and the protective device of the present invention can be assembled in the sealing plate of the secondary battery. In view of replacing polymer PTC components, it is generally advantageous to rely on and be reliable in terms of electrical devices. In other aspects, the protective device of the present invention may be used in place of the spacer used on the inside of the sealing plate of the secondary battery unit to perform component use. In this case, the protective device can be used as a gasket.

The layered element has a thin layer of conductive metal disposed on each major surface thereof, i.e., on the major surfaces on either side thereof. The metal thin layer is not particularly limited as long as it is a conductive metal thin layer (for example, a layer having a thickness of about 0.1 μm to 100 μm), and may be made of a metal such as copper, nickel, aluminum or gold.

A layered member having a thin layer of a conductive metal on each major surface can be simultaneously extruded, for example, by an insulating resin constituting the layered member together with a metal foil (or a metal foil) constituting a thin metal layer. It is produced by obtaining an extrudate in a state in which an insulating resin is sandwiched between metal foils (or metal foils). In other aspects, the layer of the insulating resin may be obtained by, for example, extrusion, and the layer may be sandwiched between the metal foils (or metal foils), and the layers may be integrally thermocompression-bonded ( Thermocompression bonding) is obtained by obtaining a crimp. Such an extrudate (or a crimp) is a state in which a thin layer of a conductive metal is provided on the main surfaces on both sides, and a plurality of layered elements of an insulating resin are adjacent to each other, and the extrudate (or crimp) is pressed. By cutting out a predetermined shape and size, a single layered element having a conductive thin layer on each major surface can be obtained.

Further, in other aspects, a conductive metal thin layer may be formed on the main surfaces on both sides by performing plating of a conductive metal on the layered element of the insulating resin. In this case, it is preferable to obtain the above-described collective state, and thereafter divide into individual layer elements.

Thus, in the case of plating, the layered element is previously bonded or thermocompressed by using another metal layer, particularly a metal foil, on the main surface thereof, for example, in the same manner as described above, and the other metal layer is bonded in advance. The components are particularly good. In this case, in the other It is preferable to form a thin layer of a conductive metal on the metal layer. As described above, when the conductive metal thin layer is formed by plating, it is advantageous from the viewpoint that the plating layer as the conductive metal thin layer is in close contact with the other metal layer which has been in close contact with the layered element. For example, the protective device of the present invention has a nickel foil as another metal layer on both sides of the layered member, and has a conductive metal thin layer and a fuse layer formed by nickel plating. That is, it is advantageous from the viewpoint of simultaneously forming a thin layer of a conductive metal and a fuse layer.

The form of the layered element is not particularly limited as long as the dimension in the thickness direction is smaller than the other dimensions, and is preferably relatively small (for example, a sheet-like form). The planar shape of the layered member (the pattern of the case where the layered member is viewed from the upper side, for example, the shape of the outline of the protective device shown in the second figure, and thus the shape of the main surface) or the layered member is perpendicular to the thickness direction The cross-sectional shape of the direction is preferably a geometrically line-symmetric and/or point-symmetric shape, such as a circle, a square, a rectangle, a diamond, a ring (especially a ring shape, a so-called doughnut shape).

Among them, the layered member is preferably annular, and particularly preferably annular. In the case of a ring shape, the central opening portion, for example, the central circular opening portion in the annular shape, may be the through opening portion of the present invention. Further, the layered element has a portion (for example, a middle portion thereof) between the inner circumference and the outer circumference of the ring shape, and has an additional through opening. For example, the layered element may have one or more through openings having a circular cross section. Therefore, the layered element has at least one through opening.

The protective device of the present invention has a fuse layer located at a position on a side surface that determines at least one of the through openings. The fuse layer is electrically connected to a thin layer of conductive metal at a position of the main surface on both sides of the layered member, and has a function of a fuse, and the thin layer of the conductive metal on one main surface faces the other A thin layer of a conductive metal on a main surface, in the case where an excess current is flowing, and as a result of excessive current flowing through the fuse layer intensively, the fuse layer is melted to open the circuit, and the current is interrupted. Such a fuse layer is formed on a side surface that determines at least one through opening. More specifically, as long as the conductive metal thin layer on both sides can be electrically connected, a fuse layer may be formed on at least a part of such a side surface, but it is preferably It is formed throughout the entire side of the side. The formation method is not particularly limited, and it is particularly preferable to perform plating (for example, electroplating or electroless plating) of a conductive metal, for example, by nickel plating. The thickness of the fuse layer can be controlled by plating conditions, but for example, 0.001 to 0.02 mm is preferable.

In the case where a through-opening having a fuse layer on one side is provided, the layered element is circular or other suitable original non-porous flat plate shape, preferably at its central portion (eg, the planar shape is circular (ie, In the case of a layered element of a disk shape, such a central portion is provided with a through opening (also referred to as a "central through opening"). As a result, the layered member strictly has a ring shape. The current flowing through the conductive metal thin layer on one of the main surfaces of the layered element having such an annular shape flows toward one end portion of the through opening portion, and then passes through the fuse layer from the other end portion of the through opening portion Radially flowing through a thin layer of conductive metal on the other major surface of the layered element.

In the aspect in which the layered element is provided with one through-opening portion, it is preferable to provide a larger through-opening portion at the center portion of the annular member as compared with the case where a plurality of through-opening portions are provided in detail later. As a center through opening, a fuse layer is provided on the side surface of the through opening. Such a protection device can be suitably used in the case where a large-capacity current (preferably a current larger than 20 A, for example, 30 to 40 A or a larger current, for example, 50 A) flows, because the resistance value can be made small. . Moreover, since only one through opening portion is provided, the manufacture of the protective device is relatively simple.

In a preferred embodiment, the layered element is an annular shape determined by the inner circumference 30 and the outer circumference 34 as shown in the second or fourth drawings to be described later. The diameter of the circle defining the inner circumference of the layered member is, for example, 6 to 10 mm, and the diameter of the circle on the outer circumference is determined, and is preferably, for example, 13 to 17 mm. For the protection device in the case where a current of 30 to 40 A flows, it is preferable that the diameter of the inner circumference circle is, for example, 6.5 mm, and the thickness of the fuse layer is, for example, 0.01 mm.

In the case where a plurality of through openings are provided, it is preferable to arrange the through openings so that the current passing through the layer elements flows through the fuse layers of the respective through openings as uniformly as possible. For example, in the peripheral portion of the annular layered element having the central through opening portion (that is, the body of the layered element determined by the inner circumference and the outer circumference) In some cases, a plurality of through openings having the same cross-sectional shape and size (also referred to as "peripheral through openings") may be provided. In this case, it is preferable to set them at equal angles with respect to the center of the circle defining the inner circumference of the ring. Through the opening. For example, two are provided at intervals of 180°, three at intervals of 120°, four at intervals of 90°, or six through openings at intervals of 60°. However, depending on the conditions of use of the protective device, the layered element may have only one peripheral through opening. Therefore, the number of the circumferential through openings may be, for example, 1 to 6.

Determining the inner circumference of the annular layer-shaped element, that is, the diameter of the cross-sectional circle of the central through-opening is the same as or smaller than the diameter of the other through-opening, that is, the diameter of the peripheral through-opening A fuse layer may be provided on the side surface that determines such a center through opening. On the other hand, in the case where the diameter of the cross-sectional circle of the center through-opening portion is larger than the diameter of the cross-sectional circle of the peripheral through-opening portion, it is preferable to provide no fuse layer on the side surface defining the center through-opening portion.

Whether or not the fuse layer is provided in the center through opening portion is determined by whether or not the current flowing through the fuse layer provided in each of the through openings of the protection device is substantially equal. In short, in the case where the central through-opening has a larger circular cross section than the peripheral through-opening, when a fuse layer is provided in the central through-opening, substantially most of the current flowing through the protective device flows through it. In the fuse layer, it is difficult for current to flow through the fuse layer provided in another through-opening portion having a smaller circular cross-section. Therefore, it is not meaningful to provide a fuse layer in other through-opening portions.

In a preferred embodiment, the layered element is an annular element determined by the outer circumference and the inner circumference, and the through-opening is defined as the center through-opening by the inner peripheral surface, and the other through-opening is penetrated by the layered element. In other words, the inner side and the outer side of the layered element (that is, the portion of the insulating resin that determines the layered element) may be formed to penetrate the opening. Therefore, in this case, the layer-shaped element has a central through-opening (one) determined by the inner circumference; and at least one through-opening of the main portion of the layered element (corresponding to the peripheral penetration) Opening)).

In this aspect, the fuse layer is present on the side (i.e., the wall) that defines the peripheral through opening. The diameter of the center through opening and the diameter of the peripheral through opening There is no major difference in the diameter, and there is a fuse layer in the center through-opening. It is expected that the fuse layer may have a current equivalent to the fuse layer of the peripheral through-opening, and the center through-opening also Set the fuse layer. Further, in the case where the diameter of the center through opening portion is larger than the diameter of the peripheral through opening portion, and the fuse layer exists in the center through opening portion, it is expected that the fuse layer has a fuse layer farther than the peripheral through opening portion. When a large amount of current flows, since there is no longer a meaning that the fuse layer is provided to penetrate the opening portion in the periphery, the fuse is not provided in the center through opening portion.

Therefore, the annular layered element having a plurality of through openings, for example, in the form of a protective device having an annular layered element, the central through opening has no fuse layer, and has a circumferential shape around it. A plurality of peripheral through openings. The circumference of the peripheral through opening portion is usually preferably one layer, and there are a plurality of layers, for example, a circumference of two layers or a circumference of three layers, as the case may be. As described above, in the case where only the fuse layer is provided in the peripheral through-opening portion, the resistance value of the protective device can be controlled in accordance with the number of peripheral through-opening portions provided. Basically, when the number of peripheral through openings is increased, the resistance value is decreased, and conversely, when the number is decreased, the resistance value is increased. Therefore, compared with the aspect in which the fuse layer is provided only in the center through opening portion, the advantage of the resistance value of the protection device can be easily and precisely changed by merely changing the number of the through openings provided.

When the layered element has a ring shape, for example, in the form of a ring, the peripheral through opening portion is preferably located at a symmetrical position with respect to the center of the layered member. In the case where a plurality of peripheral through-opening portions are present, for example, in the center of the annular member, that is, there are 2 to 12, preferably 4 to 10, at equal angles around the center of the figure defining the inner circumference, for example, the circle. More preferably, it is 5 to 9 pieces, and particularly preferably 6 to 8 pieces, for example, there are 2 at intervals of 180°, 3 at intervals of 120°, 4 at intervals of 90°, 6 at intervals of 60°, and at intervals of 45°. There are eight, there are nine at intervals of 40°, and there are ten at intervals of 36°.

In a specific aspect, the diameter of the center through-opening portion (the fuse layer is not provided) is 6 to 10 mm, and the diameter of the cross-sectional circle around the opening portion (the fuse layer is provided) is 0.2 to 1 mm. In this aspect, the outer diameter of the layered member is preferably, for example, 13 to 17 mm. For a protection device that flows through a current of 20 to 30 A, For example, it is preferable to provide four peripheral through openings having a diameter of 0.6 mm, and the thickness of the fuse layer is, for example, 0.01 mm.

Further, in any aspect, the cross-sectional shape of the through-opening portion (that is, the shape of the cross-section perpendicular to the thickness direction of the layered member) is preferably circular, but may have any other suitable cross-sectional shape. It is generally preferred to have a circular cross section. In other aspects, it may be a square, a rectangle, a diamond, a triangle, or the like. In this case, the above diameter corresponds to an equivalent diameter of other cross-sectional shapes.

The fuse layer disposed on the side (or the circumferential surface) defining the through opening has a function of electrically connecting the main surfaces on both sides of the layered member while the excess current is from one main surface toward the other main In the case where the surface flows, as a result of the excessive current flowing through the fuse layer intensively, such a current flows and is broken due to the melting of the fuse layer. The material constituting such a fuse layer is a conductive material, particularly a conductive metal layer. Preferably, for example, a thin layer of a metal such as copper, nickel, aluminum or gold is used to form a fuse layer. The fuse layer is particularly preferably formed by plating the metal thereof.

Therefore, the cross-sectional shape of the through-opening portion, the size of the through-opening portion (usually the diameter), the length of the through-opening portion along the thickness direction of the layered element, the material of the fuse and the thickness of the fuse layer, and the through-opening portion are selected. Various factors such as the number and configuration are melted in accordance with the amount of excess current assumed, and the value thereof is selected as a predetermined method. The selection is as long as it is familiar to the skilled person, and such factors can be implemented, for example, in a trial and error manner.

In a preferred embodiment, the conductive metal thin layer and the fuse layer are formed integrally by plating with a conductive metal, more preferably by nickel plating. In this case, it is advantageous to form the layered elements having the through openings by such a metal, and to form the layers simultaneously and integrally. That is, the fuse layer and the conductive metal thin layer can be formed of the same type of metal. In the case of plating, electroplating or electroless plating can be used.

In a particularly preferred aspect, there is a metal foil which is in close contact with the layered element between the main surface of the layered element and the conductive metal thin layer, preferably a nickel foil. In this case, a thin layer of a conductive metal formed as a plating layer may be adhered to the metal foil, As a result, there is an advantage that the conductive metal thin layer is firmly bonded to the layered member via the metal foil.

The protection device of the present invention protects a circuit to be protected or an electrical component constituting the circuit, and a first electrical component (for example, a secondary battery) and a second electrical component (for example, a charger) as another electrical component. Electrically directly or indirectly connected to the location of the space, as a result, a thin layer of conductive metal is in direct or indirect contact with the first electrical component, and another thin layer of conductive metal and the second electrical component Direct or indirect contact. Accordingly, the protective device of the present invention, and the electrical device having the electrical circuit and/or electrical components electrically coupled by the protective device are also provided by the present invention.

The protection device of the present invention has a thin layer of conductive metal on the main surfaces on both sides of the layered element, and a large current flows through the fuse layer to electrically connect the thin layers of the metal, and at the same time, an excess current flows through In this case, the excess current flows intensively through the fuse layer, and as a result, the fuse layer is melted and the circuit is broken, whereby the flow of the excess current can be broken.

The protective device of the present invention will be described in more detail with reference to the drawings. The first figure shows an aspect of the protection device of the present invention, showing a schematic view of a cross-sectional view along the thickness direction thereof (the cut-off section shows the existing part in A), and the second figure is shown in the first figure. The protective device is shown in plan view (i.e., in the first figure, from the top of the figure, indicated by the arrow B, when the protective device is viewed).

The protective device 10 shown in the figure is formed of an insulating resin, and has at least one through-opening portion. In the illustrated embodiment, the protective layer 10 has an annular layer-like element 16, and the layered element 16 has a circular through-center opening. 12 and the periphery of the circular cross section penetrate the two through openings of the opening portion 14. The protective device 10 in turn has thin layers 22 and 24 of conductive metal on the major surfaces 18 and 20 on either side of the layered component 16. Further, in the illustrated embodiment, other metal layers 26 and 28 are present between the layered element 16 and the conductive metal thin layers 22 and 24.

In the illustrated embodiment, there is no fuse layer on the inner circumferential surface 30 of the ring defining the center through opening portion 12, that is, on the side surface on the inner side of the annular ring. In the illustrated embodiment, the fuse layer 40 is present on the circumferential side surface 38 defining the peripheral through opening portion 14, and the peripheral through opening portion 14 is a layered element located between the inner circumference 30 and the outer circumference 34 of the ring. The position of the body portion 36.

In the illustrated embodiment, the peripheral through-opening portion 14 having the fuse layer 40 is disposed on the body portion 36 only along the diameter (shown in broken lines in the second figure) passing through the center O of the layered member. In the middle, it is also possible to provide such a peripheral through-opening on the opposite side in the diametrical direction. In this case, two peripheral through openings are provided around the center O at intervals of 180°. Further, in other aspects, the center O of the circle is preferably 3 to 12, more preferably 4 to 10, and particularly preferably 6 to 8 peripheral through openings having a fuse layer at equal angles. The arrangement may be, for example, three at intervals of 120°, four at intervals of six, six at intervals of six, or eight at intervals of eight, and that have a peripheral through-opening having a fuse layer at equal angles.

Further, in the illustrated embodiment, since the diameter of the center through opening portion 12 is much larger than the diameter of the peripheral through opening portion 14, there is no fuse layer on the side of the inner circumference 30 of the ring, but the center through opening In the case where the diameter of the portion is equal to or smaller than the diameter of the peripheral through-opening portion, a fuse layer may be provided on the side of the inner circumference 30 of the ring as needed. Further, in some aspects, when the convex portion corresponding to the central through-opening portion is previously provided in the electrical device to which the protective device is to be disposed, the convex portion may be made in the large-diameter portion of the central through-opening portion. Embedding to position the protection device to the electrical device. For example, by providing such a convex portion on the sealing plate of the secondary battery unit, the convex portion is fitted into the center through opening portion, and the protective device can be positioned on the sealing plate.

In other aspects, the layered element 16 may not have the central through opening portion 12 (therefore, the layered element has a circular plate shape), but only has at least one peripheral through opening portion 14, and the peripheral through opening portion 14 has a melting Line layer 40.

In the third and fourth figures, the protection device 10' according to still another aspect of the present invention is shown in the same manner as the first diagram and the second diagram. In addition, with the first map and the first The same elements in the two figures use the same symbols. In the illustrated embodiment, the layered element 16 does not have the peripheral through-opening 14 of the protective device 10 of the first drawing, and has only the central through-opening 12 having the fuser layer 32.

[Example 1]

The protective device of the present invention shown in the first and second figures is manufactured. Therefore, the protective device 10 is manufactured, which has only the fuse layer 40, and has no fuse layer 32 of the protective device 10' of the third figure. However, the peripheral through-openings 14 are formed in a circumferential shape at equal angles around the center O.

First, a sheet of an insulating resin (a polyethylene having a thickness of 0.3 mm corresponding to the layered member 16) is prepared, and nickel foil (thickness: 22 μm, corresponding to the other metal layers 26 and 28) is disposed on both sides thereof, and heated. Then, these were integrally pressed to obtain a pressure-bonded product in which a nickel foil was adhered to both main surfaces of an insulating resin sheet.

A through hole having a diameter of 0.6 mm (corresponding to the peripheral through opening portion 14) is formed at a predetermined portion of the crimped material, and thereafter, the pressed product is subjected to a nickel plating treatment by an electrolytic method. The thickness of the nickel layer (corresponding to the conductive metal thin layers 22 and 24) formed by plating is about 0.01 mm. Next, the annular member is punched out from the crimping member to obtain the protective device 10 of the present invention, and the four through holes are located at a predetermined interval of 90° around the center of the annular member.

The diameter of the outer circumference 34 of the obtained annular member was 15 mm, and the diameter of the inner circumference 30 (that is, the diameter of the center through opening) was 6.4 mm. The annular member has a nickel foil functioning as the other metal layers 26 and 28 on the both main surfaces of the insulating resin layer 16 as the layer member, and has four in the middle portion of the body portion 36 of the annular portion. The periphery penetrates the opening portion 14. Further, the annular element has a plating layer as the conductive metal thin layers 22 and 24 on the nickel foil, and has a plating layer functioning as the fuse layer 40 on the inner circumferential surface of the peripheral through-opening portion. .

In the resulting protective device of the present invention, a predetermined current (20A) is flowed from a thin layer of conductive metal 22 to another thin layer of conductive metal 24, and after 10 minutes of measurement, The surface temperature of the conductive metal thin layer 22 of the protective device rises. Further, the current interruption time of the fuse as the protection device (that is, the time until the fuse layer fuses at the time of 100 A current flow) is measured.

As a result, the surface temperature rise is also 10 ° C or less at any place, and the current interruption time is 0.1 second or less.

[Example 2]

The protection device of the present invention shown in the third and fourth figures is manufactured. Therefore, the protective device 10' is manufactured without the peripheral through opening portion, and has only the fuse layer 32 around the center through opening portion. Further, in the manufacturing method, the opening portion corresponding to the center through opening portion is formed on the pressure-bonding material, and a fuse layer is formed by a plating process, and thereafter, the annular element is punched out to obtain protection. Other than the apparatus 10', the other implementation was carried out in the same manner as in the first embodiment. The diameter of the center through opening is 6.5 mm, and the thickness of the fuse layer is 0.1 mm.

In the protective device of the present invention, a predetermined current (30-40 A) is flowed from a thin layer of conductive metal 22 to another thin layer of conductive metal 24, and the surface of the thin conductive layer 22 of the protective device is measured after 10 minutes. The temperature rises. Further, the current interruption time of the fuse as the protection device (that is, the time until the fuse layer is blown when 100 A current flows) is measured.

As a result, the surface temperature rise was 10 ° C or less at any place, and the current interruption time was about 0.1 second.

It can be seen from the results that the protection device of the present invention allows a larger current to flow while providing protection against excess current. Therefore, in the protection device of the present invention, in the case where the current value of the steady state flow is extremely increased, for example, in the case of a cylindrical lithium ion secondary battery unit, it can also be utilized as an assembly. Nickel washers for sealing plates, gaskets for nickel plating of stainless steel, etc. In this case, since the protective device has a layered element formed of an insulating resin, the function as a gasket is improved by the elasticity of the resin. Accordingly, the present invention can also provide a gasket having the features of the above-described protective device of the present invention.

10, 10'‧‧‧protective components

12‧‧‧ center through opening

14‧‧‧ peripheral through opening

16‧‧‧Layered components

18, 20‧‧‧ main surface

22, 24‧‧‧ Thin layer of conductive metal

26, 28‧‧‧Other metal layers

30‧‧‧ inside week

32‧‧‧Fuse layer

34‧‧‧ lateral week

36‧‧‧ body part

38‧‧‧ side

40‧‧‧Fuse layer

The first figure shows a schematic view of a protective device of the present invention in a cross-sectional view along its thickness.

The second figure shows a schematic view of a plan view of the protection device shown in the first figure.

The third figure shows a schematic view of a cross-sectional view along the thickness direction of the protective device of other aspects of the present invention.

The fourth figure shows a schematic view of a plan view of the protection device shown in the third figure.

10‧‧‧protection device

12‧‧‧ center through opening

14‧‧‧ peripheral through opening

16‧‧‧Layered components

18,20‧‧‧Main surface

22,24‧‧‧a thin layer of conductive metal

26,28‧‧‧Other metal layers

30‧‧‧ inside week

34‧‧‧ lateral week

36‧‧‧ body part

38‧‧‧ side

40‧‧‧Fuse layer

Claims (10)

A protective device comprising: a layered member formed of an insulating resin and having at least one through opening; and a thin layer of conductive metal positioned on each major surface of the layered member; a fuse layer located on a side surface defining the at least one through opening portion and electrically connecting the conductive metal thin layer, wherein the conductive metal thin layer and the fuse layer are coated metal Formed integrally, the plating metal is nickel. The protective device of claim 1, further comprising a metal foil located between the layered element and the thin layer of the conductive metal. The protective device of claim 2, wherein the metal foil is a nickel foil. The protective device according to claim 1, wherein the layered element is an annular element defined by an inner circumferential surface and an outer circumferential surface, and has one through opening defined by the inner circumferential surface. The protective device according to claim 1, wherein the layered element is defined by an inner circumferential surface and an outer circumferential surface, and has at least two annular members that penetrate the opening, and the through openings are the inner side The center through opening portion defined by the circumferential surface and at least one peripheral through opening portion located between the inner circumferential surface and the outer circumferential surface, the peripheral through opening having the fuse layer. The protective device of claim 5, wherein in the layered element, the peripheral through-opening portion is provided at an equiangular angle of 6 to 8 around the central through-opening. The protective device of claim 1, wherein the layered member has an annular shape. An electrical device characterized by having the protective device according to any one of claims 1 to 7. A secondary battery unit characterized by having the first to seventh ranges as claimed in the patent application A protective device of any of the items. A gasket having: a layered member formed of an insulating resin and having at least one through opening; a conductive metal thin layer positioned on each major surface of the layered member; and a fuse layer And located at a position on the side surface of the at least one through opening, and electrically connecting the conductive metal thin layer. The conductive metal thin layer and the fuse layer are integrally formed by plating a metal, and the plating metal is nickel.