KR20160040567A - Protective element and battery pack - Google Patents

Abstract

While ensuring the current capacity at the time of overcurrent protection, it is surely fused by the heat of the heating element. The first insulating substrate 55 and the first and second external electrodes 51 and 52 and the heating element 57 formed on the back surface 55b side of the first insulating substrate 55 and the first insulating substrate 55 Front and back surface electrodes 56 and 64 formed between the first external electrode 51 and the second external electrode 52 on the surface 55a of the surface 55a and the surface electrode 55 on the surface 55a, A through hole 58 in which an electrically conductive layer 65 is formed on the inner side surface and a through hole 58 which is filled in the through hole 58 are formed on the first and second external electrodes 51 and 52, (66). The preliminary solder 66 and the usable conductor 53 are melted by the heat of the heating element 57 and the temperature of the conductive layer 65 and the like in the front and back surface electrodes 56 and 64, The molten preliminary solder 66 and the usable conductor 53 move to the side of the back surface 55b of the first insulating substrate 55 having a high temperature.

Description

[0001] PROTECTIVE ELEMENT AND BATTERY PACK [0002]

The present invention relates to a protection element and a battery pack which protect a circuit connected on a current path by fusing an electric current path. This application is based on and claims priority to Japanese Patent Application No. 2013-163950, filed on August 7, 2013, and Japanese Patent Application No. 2014-113044, filed on May 30, 2014, Which are hereby incorporated by reference in their entirety.

A large number of rechargeable secondary batteries that are recharged and recharged are processed into battery packs and provided to the user. Particularly, in a lithium ion secondary battery having a high weight energy density, in order to secure the safety of a user and an electronic device, several protection circuits such as overcharge protection and over discharge protection are built in a battery pack, And the output of the battery pack is cut off.

In an electronic device using many lithium ion secondary batteries, an output switch is turned ON / OFF using an FET switch incorporated in the battery pack to perform overcharge protection or over-discharge protection operation of the battery pack. However, even if the FET switch is short-circuited for some reason, an instantaneous large current flows due to a brain surge or the like, or the output voltage abnormally decreases due to the life of the battery cell, or an over- , Battery packs or electronic devices must be protected from accidents such as ignition. In order to safely shut off the output of the battery cell even in such an assumed abnormal state, a protection element composed of a fuse element having a function of cutting off the current path by an external signal is used.

As a protection element for a protection circuit for such a lithium ion secondary battery and the like, as disclosed in Patent Document 1, there is a structure in which a heating element is provided inside a protection element and the usable conductor on the current path is fused by heat generation of the heating element It is generally used.

Japanese Laid-Open Patent Publication No. 2010-3665

In the protection device described in Patent Document 1, the usable conductor (fuse) has a current capacity of about 15 A at maximum for use in applications where the current capacity is comparatively low such as a cellular phone or a notebook PC. The use of lithium ion secondary batteries has recently been expanded, and applications for larger currents, such as electric power tools such as electric drivers, and transportation devices such as hybrid cars, electric vehicles, and electric assist bicycles, . In such applications, large currents exceeding tens of A to 100 A sometimes flow, particularly at startup. It has been desired to realize a protection device corresponding to such a large current capacity.

In order to realize a protective element corresponding to a large current, it is sufficient to increase the cross-sectional area of the usable conductor. However, in addition to the case where the protection element is fused by the overcurrent state, it is necessary to detect the overvoltage state of the battery cell, to supply current to the heating element formed of the resistor, and to cut the usable conductor by the heat generation. If the cross-sectional area is increased in order to cope with a large current, the melting amount of the usable conductor at the time of melting becomes large, and it becomes difficult to stably fuse the usable conductor. If the melting amount of the usable conductor is large, the amount of aggregation of the molten conductor also increases immediately before the current interruption due to the overcurrent, and the molten conductor is scattered by a large amount due to the arc discharge at the time of interruption, The risk of short circuit of the peripheral circuit at the position becomes high. It is also a problem that the fusing operation varies depending on the posture in which the protection element is disposed.

It is therefore an object of the present invention to obtain a protection element and a battery pack capable of suppressing the scattering of the molten conductor due to arc discharge when the current is cut by the overcurrent while securing the current capacity at the time of overcurrent protection. It is another object of the present invention to provide a protection element and a battery pack which can surely fuse a usable conductor by heat generated by a heating element while securing current capacity at the time of overcurrent protection.

A protective element according to the present invention for solving the above-mentioned problems has a first insulating substrate and a usable conductor mounted on a surface of the first insulating substrate, and on the surface of the first insulating substrate, (Suction holes) for sucking the suction holes.

The battery pack according to the present invention includes at least one battery cell and a protection element connected to the charge and discharge path of the battery cell for blocking the charge and discharge path, And a usable conductor mounted on a surface of the first insulating substrate and serving as the charging / discharging path, and a suction hole for sucking the melted usable conductor is opened on the surface of the first insulating substrate.

The protection element according to the present invention is a protection element comprising first and second external electrodes, a usable conductor connected between the first and second external electrodes, and a second electrode connected to the usable conductor, And the suction member includes a first insulating substrate disposed between the first and second external electrodes, a second insulating substrate formed on the surface of the first insulating substrate and having a surface electrode connected to a part of the usable conductor, And a through hole continuous with the surface electrode, the through hole being formed in the thickness direction of the first insulating substrate, wherein the first external electrode and the second external electrode are formed by melting the usable conductor, 2, the current path between the external electrodes is cut off.

A battery pack according to the present invention includes at least one battery cell, a protection element connected to the charging / discharging path of the battery cell, for blocking a charging / discharging path thereof, And a current control element for controlling energization to the protection element, wherein the protection element includes first and second external electrodes, a usable conductor connected between the first and second external electrodes, And a suction member for sucking a conductor, wherein the suction member includes: a first insulating substrate disposed between the first and second external electrodes; and a second insulating substrate formed on a surface of the first insulating substrate, And a through-hole formed in the thickness direction of the first insulating substrate and continuous with the surface electrode, wherein the through-hole is formed by melting the usable conductor, The first outer electrode and to interrupt the current path between the second external electrode.

A protection element according to the present invention for solving the above-mentioned problems includes a first insulating substrate, first and second external electrodes, a first external electrode on one surface side of the first insulating substrate, An intermediate electrode formed between the second external electrodes, a heating element formed on the other surface side of the first insulating substrate, and a second insulating substrate connected to the intermediate electrode on one surface of the first insulating substrate, And a second external electrode formed on the other surface of the first insulating substrate and electrically connected to the first external electrode and the second external electrode, A heating element lead-out electrode electrically connected to one terminal of the heating element, and a heating element lead-out electrode formed in the thickness direction of the first insulating substrate between the middle electrode and the heating element lead- And a through hole having a conductive layer continuous with the heating-element lead-out electrode.

A battery pack according to the present invention includes at least one battery cell, a protection element connected to cut off current flowing in the battery cell, and a current control element for detecting a voltage value of each battery cell and controlling a current for heating the protection element Respectively. The protection element includes a first insulating substrate, first and second external electrodes, an intermediate electrode formed between the first external electrode and the second external electrode on one surface side of the first insulating substrate, , A heating element formed on the other surface side of the first insulating substrate, and a heating element connected to the intermediate electrode on one surface of the first insulating substrate and connected to the first and second external electrodes, And a second external electrode formed on the other surface of the first insulating substrate and electrically connected to one terminal of the first heating substrate, And a conductive layer which is formed on the inner surface of the intermediate insulating layer in a thickness direction between the intermediate electrode and the heating element lead-out electrode and which is continuous with the intermediate electrode and the heating-element lead- Provided with a through hole formed.

According to the present invention, when the soluble conductor is melted, the molten soluble conductor is drawn into the suction hole formed in the first insulating substrate, so that it is surely fused even when a large amount of the molten conductor is generated. Therefore, even when the cross-sectional area of the usable conductor is increased to improve the rating, the current path can be reliably cut.

1 is a cross-sectional view showing a protective element to which the present invention is applied.
2 is a cross-sectional view showing a state in which a molten conductor is sucked in a protective element to which the present invention is applied.
3 is a cross-sectional view showing a state in which a usable conductor is fused in a protection element to which the present invention is applied.
4 is a block diagram showing a configuration example of a battery pack in which a protection element is used.
5 is a circuit diagram of a protection device to which the present invention is applied.
6 is a cross-sectional view showing a protective element having a heating element on the surface side of the first insulating substrate.
7 is a cross-sectional view showing a protective element having a heating element on the back side of the first insulating substrate.
8 is a cross-sectional view showing a protective element having a heating element in a first insulating substrate.
9 is a block diagram showing a configuration example of a battery pack in which a protection element is used.
10 is a circuit diagram of a protection device to which the present invention is applied.
11 (A) is a plan view of a protection device to which the present invention is applied. 11B is a sectional view taken along the line AA 'in Fig. 11A.
Fig. 12 is a block diagram showing an application example of a protection element to which the present invention is applied.
13 is a diagram showing an example of the circuit configuration of a protection element to which the present invention is applied.
14 (A) is a cross-sectional view showing the operation of a heating element of a protection element to which the present invention is applied. 14 (B) is a cross-sectional view showing a state in which the usable conductor is fused.
Figs. 15A to 15E are diagrams showing attitudes of a usage pattern of a protection device to which the present invention is applied.
Fig. 16 is a diagram showing the fusing time of the usable conductor in each posture of Figs. 15 (A) - (E).
FIG. 17A is a plan view of the agglomerated protective device for reference, and FIG. 17B is a sectional view taken along line AA 'of FIG. 17A. Fig. 17 (C) is a cross-sectional view in a fused state.
18A to 18E are diagrams showing the posture in the use mode of the protection element of the reference example shown in Fig.
Fig. 19 is a diagram showing the fusing time of the usable conductor in each posture of Figs. 18 (A) - (E).
Fig. 20 is a view showing a modified example of the through hole formed in the intermediate electrode of the first insulating substrate, Fig. 20 (A) showing an example in which the through holes are formed in two rows, Fig. 20 (B) An example is shown.
21 is a cross-sectional view showing a protective element having a heating element on the surface side of the first insulating substrate.
Figs. 22A to 22E are diagrams showing attitudes of the usage pattern of the protection device to which the present invention is applied. Fig.
Fig. 23 is a diagram showing the fusing time of the usable conductor in each posture of Figs. 22 (A) - (E).
Fig. 24 is a cross-sectional view showing a protective element provided with a coagulating member, in which (A) shows the state before the fusing of the usable conductor, and (b) after the fusing of the fusible conductor.
Fig. 25 is a circuit diagram showing a protective element provided with a coagulating member. Fig.
Fig. 26 is a cross-sectional view showing a protection element having a plurality of suction members, wherein (A) shows a state before the melting of the usable conductor, and (B) after the melting of the usable conductor.
FIG. 27 is a circuit diagram showing a protection device having a plurality of suction members. FIG.
28 is a perspective view showing a usable conductor having a high melting point metal layer and a low melting point metal layer and having a covering structure, (A) showing a structure in which a high melting point metal layer is covered with a low melting point metal layer as an inner layer, Shows a structure in which a low melting point metal layer is covered with a high melting point metal layer as an inner layer.
Fig. 29 is a perspective view showing an available conductor having a laminated structure of a refractory metal layer and a refractory metal layer. Fig. 29A shows a three-layer structure of an upper and a lower two-layer structure, and Fig.
30 is a cross-sectional view showing an available conductor having a multilayer structure of a refractory metal layer and a refractory metal layer.
Fig. 31 is a plan view showing a usable conductor in which a line-shaped opening is formed on the surface of the refractory metal layer to expose the refractory metal layer. Fig. 31 (A) shows an opening formed along the longitudinal direction, And an opening portion is formed.
32 is a plan view showing a usable conductor in which a circular opening is formed on the surface of the high melting point metal layer and the low melting point metal layer is exposed.
33 is a plan view showing a usable conductor in which a circular opening is formed in the refractory metal layer and a low melting point metal is filled in the refractory metal layer.
34 is a plan view showing a thick conductor covered with a refractory metal and a usable conductor formed with a second side edge portion where a low melting point metal is exposed;

 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[First Embodiment]

The protective element 1 to which the present invention is applied has a first insulating substrate 10 and an available conductor 13 mounted on the surface 10a of the first insulating substrate 10, On the surface 10a of the first insulating substrate 10, a suction hole 20 for sucking the melted solder 13 is opened. The protective element 1 is mounted on an external circuit so that the usable conductor 13 constitutes a part of the current path of the external circuit and is cut off by the overcurrent exceeding the rated value to thereby cut off the current path.

The first insulating substrate 10 is formed in a shape of an insulating member such as alumina, glass ceramics, mullite, or zirconia, for example. In addition, as the first insulating substrate 10, a material used for a printed wiring board such as a glass epoxy substrate, a phenol substrate, or the like may be used.

First and second electrodes 11 and 12 are formed on opposite ends of the surface 10a of the first insulating substrate 10, respectively. The first and second electrodes 11 and 12 are each formed by a conductive pattern such as Cu wiring and a protective layer such as Sn plating is appropriately formed on the surface as an anti-oxidation measure. The first and second electrodes 11 and 12 are formed on the back surface 10b with the conductive layers 11b and 12b reaching the back surface 10b through the side surface of the first insulating substrate 10, And is connected to the first and second external connection electrodes 11a and 12a. The protection element 1 is connected on the current path of the circuit board by connecting the first and second external connection electrodes 11a and 12a to the circuit board constituting the external circuit. The usable conductor 13, which will be described later, is mounted between the first and second electrodes 11 and 12 so that the usable conductor 13 is electrically connected to the first and second external connection electrodes 11a And 12a of the circuit board.

In the first insulating substrate 10, a suction hole 20 is formed between the first and second electrodes 11 and 12. The suction hole 20 sucks the molten conductor 13a by the capillary phenomenon and reduces the volume of the molten conductor 13a when the soluble conductor 13 is melted by the self heat generated by the overcurrent 2). The protection element 1 can reduce the volume of the molten conductor 13a by increasing the cross-sectional area of the usable conductor 13 in order to cope with the application of a large current, even when the amount of melting is increased, . As a result, the protection element 1 can prevent scattering of the molten conductor 13a due to arc discharge at the time of interruption to prevent lowering of the insulation resistance, It is possible to prevent short-circuit failure due to adhesion.

The suction hole 20 has a conductive layer 21 formed on the inner surface thereof. Since the conductive layer 21 is formed, the suction hole 20 can easily suck the molten conductor 13a. The conductive layer 21 is formed of an alloy mainly composed of any one of copper, silver, gold, iron, nickel, palladium, lead and tin, It can be formed by a known method such as plating or printing of a conductive paste. The conductive layer 21 may be formed by inserting a plurality of metal wires or an aggregate of conductive ribbons into the suction holes 20. [

It is preferable that the suction hole 20 is formed as a through hole penetrating in the thickness direction of the first insulating substrate 10. As a result, the suction holes 20 can suck up the molten conductor 13a to the side of the back surface 10b of the first insulating substrate 10, attract more molten conductors 13a, The volume of the molten conductor 13a can be reduced. The suction hole 20 may be formed as a non-through hole.

A surface electrode 22 connected to the conductive layer 21 of the suction hole 20 is formed on the surface 10a of the first insulating substrate 10. The surface electrode 22 is a support electrode to which the usable conductor 13 is connected. The surface electrode 22 is continuous with the conductive layer 21 so that when the usable conductor 13 is melted, the molten conductor 13a is easily agglomerated and guided in the suction hole 20. [

A back electrode 23 connected to the conductive layer 21 of the suction hole 20 is formed on the back surface 10b of the first insulating substrate 10. The back electrode 23 is continuous with the conductive layer 21 so that when the usable conductor 13 is melted, the molten conductor 13a moved through the suction hole 20 is agglomerated (see Fig. 3). As a result, the protection element 1 can attract more molten conductor 13a and reduce the volume of the molten conductor 13a at the melting end portion.

The protective element 1 is formed by forming a plurality of suction holes 20 so that the path for sucking the molten conductor 13a of the usable conductor 13 is increased to attract more molten conductor 13a, The volume of the molten conductor 13a may be reduced.

Next, the usable conductor 13 will be described. The usable conductor 13 is mounted between the first and second electrodes 11 and 12 and is fused by self heat generation (juxtaposition) by passing a current exceeding the rated value, The current path between the two electrodes 12 is cut off.

For example, in addition to SnAgCu-based Pb-free solder, the usable conductor 13 may be a BiPbSn alloy, a BiPb alloy, a BiSn alloy, a SnPb alloy, a PbIn alloy, a ZnAl alloy, an InSn Alloy, a PbAgSn alloy, or the like can be used.

The usable conductor 13 may be a structure containing a refractory metal and a refractory metal. For example, as shown in Fig. 1, the usable conductor 13 is a laminated structure composed of an inner layer and an outer layer, and as the inner layer, a low melting point metal layer 13b and an outer layer laminated on the low melting point metal layer 13b, (13c). The usable conductor 13 is connected to the first and second electrodes 11 and 12 and the surface electrode 22 via a bonding material such as solder.

The low-melting-point metal layer 13b is preferably a solder or a metal containing Sn as a main component and is generally called a "Pb-free solder" (for example, M705 manufactured by Senju Metal Industries Co., Ltd.). The melting point of the low melting point metal layer 13b is not necessarily higher than the temperature of the reflow furnace, and may be melted at about 200 캜. The refractory metal layer 13c is a metal layer laminated on the surface of the low melting point metal layer 13b and is made of, for example, Ag or Cu or a metal mainly composed of any of them, and the protective element 1 is placed on a reflow furnace Even when mounting is carried out on an external circuit board, it has a high melting point which is not melted.

Such a usable conductor 13 can be formed by forming a refractory metal layer on the low melting point metal foil by a plating technique or by using other well known lamination techniques and film forming techniques. The usable conductor 13 may be constituted by an inner layer of a refractory metal layer and an outer layer of a refractory metal layer or a multilayer structure of four or more layers in which a refractory metal layer and a refractory metal layer are alternately laminated, And can be formed by various structures as will be described later.

The soluble conductor 13 is formed by laminating a refractory metal layer 13c as an outer layer on a refractory metal layer 13b serving as an inner layer and a refractory metal layer 13b as a refractory metal layer 13b, It does not reach the melting point of the conductor 13. Therefore, the protection element 1 can be efficiently mounted by the reflow process.

The permissible conductor 13 is not fused by self heat generation while a predetermined rated current is flowing. Then, when a current having a value higher than the rated value flows, it is melted by the self-heating and blocks the current path between the first and second electrodes 11 and 12. At this time, in the usable conductor 13, the refractory metal layer 13c is melted at a temperature lower than the melting point by melting the refractory metal layer 13c by melting the refractory metal layer 13b. Therefore, the usable conductor 13 can be fused in a short time by utilizing the erosion action of the refractory metal layer 13c by the refractory metal layer 13b. The molten conductor 13a of the usable conductor 13 has a function of absorbing the physical force of the surface electrode 22 and the first and second electrodes 11 and 12 in addition to the attracting action of the above- The current path between the first and second electrodes 11 and 12 can be shut off quickly and reliably.

Since the fusible conductor 13 is formed by laminating the refractory metal layer 13c on the refractory metal layer 13b serving as the inner layer, the refractory temperature can be significantly reduced as compared with a chip fuse made of a conventional refractory metal . Therefore, the usable conductor 13 can have a larger cross-sectional area than the chip fuse of the same size, and the current rating can be greatly improved. In addition, the chip fuse can be made smaller and thinner than the conventional chip fuse having the same current rating, and is excellent in fast wire cutting.

In addition, the usable conductor 13 can improve resistance (resistance to impulse) to surges to which an abnormally high voltage is instantaneously applied to an electrical system in which the protective element 1 is mounted. That is, the usable conductor 13 should not be fused, for example, until a current of 100 A flows for several milliseconds. In this respect, since the high current flowing in a very short time flows through the surface layer of the conductor (skin effect), and the soluble conductor 13 has the refractory metal layer 13c such as Ag plating having a low resistance value as the outer layer , It is easy to flow the current applied by the surge, and it is possible to prevent the melting due to the self heat generation. Therefore, the usable conductor 13 can greatly improve the resistance to surge as compared with the conventional fuse made of the solder alloy.

In addition, the flux conductor 14 is applied to the usable conductor 13 in order to prevent oxidation and improve wettability at the time of fusing. The protection element 1 is protected by covering the first insulating substrate 10 with the cover member 15. The cover member 15 can be formed by using a member having an insulating property such as thermoplastic plastic, ceramics, or glass epoxy substrate in the same manner as the first insulating substrate 10 described above.

[Circuit configuration]

Such a protection element 1 is used by being mounted on a circuit in a battery pack 30 of, for example, a lithium ion secondary battery as shown in Fig. The battery pack 30 has, for example, a battery stack 35 composed of battery cells 31 to 34 of a total of four lithium ion secondary batteries.

The battery pack 30 includes a battery stack 35, a charge / discharge control circuit 40 for controlling charge and discharge of the battery stack 35, A protection element 1 and a detection circuit 36 for detecting the voltages of the battery cells 31 to 34, respectively.

The battery stack 35 is connected in series with battery cells 31 to 34 requiring control to protect against overcharging and overdischarging and is connected in series between the positive terminal 30a and the negative terminal 30b And the charging voltage from the charging device 45 is applied thereto. The electronic device can be operated by connecting the positive electrode terminal 30a and the negative electrode terminal 30b of the battery pack 30 charged by the charging device 45 to an electronic device that operates with the battery.

The charging / discharging control circuit 40 includes two current control devices 41 and 42 connected in series to the current path from the battery stack 35 to the charging device 45, And a control unit 43 for controlling the operation. The current control elements 41 and 42 are constituted by, for example, a field effect transistor (hereinafter referred to as FET), and by controlling the gate voltage by the control section 43, And blocking. The control unit 43 operates in response to the supply of power from the charging device 45 so as to interrupt the current path when the battery stack 35 is overdischarged or overcharged in accordance with the detection result of the detection circuit 36, And controls the operation of the current control elements 41 and 42.

The protection element 1 is connected on the charge / discharge current path between the battery stack 35 and the charge / discharge control circuit 40, for example.

The detection circuit 36 is connected to each of the battery cells 31 to 34 and detects the voltage value of each battery cell 31 to 34 and supplies the respective voltage values to the control section 43 of the charge / .

The protection element 1 to which the present invention applied to the battery pack 30 constructed as described above has the circuit configuration as shown in Fig. That is, in the protection element 1, the first external connection electrode 11a is connected to the battery stack 35 side and the second external connection electrode 12a is connected to the positive terminal 30a side, (13) are connected in series on the charge / discharge path of the battery stack (35).

[Operation of protective device]

When the overcurrent exceeding the rating is energized in the battery pack 30, the protection element 1 melts the usable conductor 13 by self heat generation, and cuts off the charge / discharge path of the battery pack 30. [ 2 and 3, since the molten conductor 13a is attracted to the suction hole 20 via the surface electrode 22 by the capillary phenomenon, the protective element 1 is used for the large current application It is possible to reduce the volume of the molten conductor 13a at the time of interruption and reduce scattering of the molten conductor 13a due to arc discharge even when the cross-sectional area of the usable conductor 13 is increased in order to cope with the arc discharge. The protective element 1 is formed by containing the high-melting-point metal and the low-melting-point metal so that the low-melting-point metal is melted before the melting of the high-melting-point metal, And can be sucked into the hole 20.

Further, the protection element 1 according to the present invention is not limited to the case where it is used for a battery pack of a lithium ion secondary battery, and can be applied to various applications requiring interruption of an electric current path due to an overcurrent.

[Heating element]

6, the protection element to which the present invention is applied may be formed with a heating element 25 for melting the usable conductor 13 on the first insulating substrate 10. [ In the following description, the same members as those of the above-described protection element 1 are denoted by the same reference numerals, and the details thereof are omitted.

The protection element 24 in which the heating element 25 is formed can detect the overvoltage of the battery cell in addition to the magnetic flux of the usable conductor 13 at the time of overcurrent, The charging and discharging path of the battery pack can be cut off by energizing and heating and melting the usable conductor 13.

The heating element 25 is made of, for example, W, Mo, Ru or the like, which is a conductive member having a relatively high resistance and generates heat when energized. A powder of a compound or a compound thereof is mixed with a resin binder or the like to form a paste and a pattern is formed on the surface 10a of the first insulating substrate 10 by using a screen printing technique, And then baked.

The heat generating element 25 is covered on the insulating layer 26 on the surface 10a of the first insulating substrate 10. [ On the insulating layer 26, surface electrodes 22 are laminated. The insulating layer 26 is formed in order to protect and insulate the heating element 25 and to efficiently transmit the heat of the heating element 25 to the surface electrode 22 and the usable conductor 13, Glass layer. The surface electrode 22 is heated by the heating element 25 so that the molten conductor 13a of the usable conductor 13 can be easily agglomerated and easily sucked into the suction hole 20. [

The heating element 25 is connected at one end to the surface electrode 22 and electrically connected to the usable conductor 13 mounted on the surface electrode 22 via the surface electrode 22. [ The other end of the heating element 25 is connected to a heating element electrode (not shown). The heating element electrode is formed on the surface 10a of the first insulating substrate 10 and connected to the third external connecting electrode 27 (see FIG. 9) formed on the back surface 10b, (27). The protection element 1 is mounted on the circuit board constituting the external circuit so that the heating element 25 is mounted on the feeding path to the heating element 25 formed on the circuit board via the third external connection electrode 27 .

7, the protection element 24 may be formed on the back surface 10b of the first insulating substrate 10 with the heat generating element 25. [ The heat generating element 25 is formed on the back surface 10b of the first insulating substrate 10 and is covered on the insulating layer 26 on the back surface 10b. On the insulating layer 26, the back electrode 23 is laminated.

The heating element 25 has one end connected to the back electrode 23 and connected to the surface electrode 22 via the conductive layer 21 and the surface electrode 22 formed on the suction hole 20, (13). The other end of the heating element 25 is connected to the third external connection electrode 27 via a heating element electrode (not shown).

By forming the heating element 25 on the back surface 10b of the first insulating substrate 10, the protection element 24 is heated by the heating element 25 of the back electrode 23, . The protective element 24 promotes the action of sucking the molten conductor 13a from the surface electrode 22 via the conductive layer 21 to the back electrode 23 to reliably move the usable conductor 13 It can be fried.

8, the protective element 24 may be formed in the first insulating substrate 10 with the heat generating element 25. In this case, In this case, the heat generating element 25 need not be covered with an insulating layer such as glass. The heating element 25 is connected to the surface electrode 22 or the back electrode 23 at one end and is electrically connected to the usable conductor 13 mounted on the surface electrode 22. [ The other end of the heating element 25 is connected to the third external connection electrode 27 via a heating element electrode (not shown).

The surface element 22 and the back surface electrode 23 are electrically connected to the heating element 25 via the conductive layer 21 by forming the heating element 25 inside the first insulating substrate 10. [ As a result, more melted conductors 13a are easily agglomerated. The protective element 24 promotes the action of sucking the molten conductor 13a from the surface electrode 22 via the conductive layer 21 to the back electrode 23 to reliably move the usable conductor 13 It can be fried.

The heat generating element 25 is formed on both sides of the suction hole 20 in any of the surfaces 10b and 10b of the first insulating substrate 10 or in the inner surface thereof, 22 and the back electrode 23 and to agglomerate and attract more melted conductors 13a.

[Circuit configuration]

Such a protection element 24 is used by being mounted on a circuit in the battery pack 30 of, for example, a lithium ion secondary battery as shown in Fig. In the following description, the same members as those of the above-described battery pack 30 are denoted by the same reference numerals, and the details thereof are omitted.

The battery pack 30 includes a battery stack 35, a charge / discharge control circuit 40 for controlling charge and discharge of the battery stack 35, A detection circuit 36 for detecting the voltages of the battery cells 31 to 34 and a switch element for controlling the operation of the protection element 24 in accordance with the detection result of the detection circuit 36 And the current control element 37 is provided.

The protection element 24 is connected, for example, on the charging / discharging current path between the battery stack 35 and the charging / discharging control circuit 40, and its operation is controlled by the current control element 37.

The detection circuit 36 is connected to each of the battery cells 31 to 34 and detects the voltage value of each battery cell 31 to 34 and supplies the respective voltage values to the control section 43 of the charge / . The detection circuit 36 outputs a control signal for controlling the current control element 37 when any one of the battery cells 31 to 34 becomes an overcharge voltage or an overdischarge voltage.

The current control element 37 is constituted by, for example, an FET, and the detection signal output from the detection circuit 36 causes the voltage value of the battery cells 31 to 34 to exceed the predetermined overdischarge or overcharge state The protection element 24 is operated to control the charging / discharging current path of the battery stack 35 to shut off regardless of the switching operation of the current control elements 41 and 42. [

The protection element 24 to which the present invention applied to the battery pack 30 having the above-described configuration is applied has a circuit configuration as shown in Fig. That is, in the protection element 24, the first external connection electrode 11a is connected to the battery stack 35 side and the second external connection electrode 12a is connected to the positive electrode terminal 30a side, (13) are connected in series on the charge / discharge path of the battery stack (35). The protection element 24 is connected to the current control element 37 via the heating element electrode and the third external connection electrode 27 and the heating element 25 is connected to the current control element 37 via the heating element 25, And is connected to the open end. Thereby, the heat generating element 25 has one end connected to one end of the openable conductor 13 and the open end of the battery stack 35 via the surface electrode 22 and the other end connected via the third external connecting electrode 27 A feed path to the heating element 25 connected to the other open end of the current control element 37 and the battery stack 35 and to which current is controlled by the current control element 37 is formed.

[Operation of protective device]

When the overcurrent exceeding the rating is energized in the battery pack 30, the protection element 24 melts the usable conductor 13 by self heat generation and cuts off the charge / discharge path of the battery pack 30. [ At this time, in the protection element 24, since the molten conductor 13a is attracted to the suction hole 20 via the surface electrode 22 by the capillary phenomenon, in order to cope with the application of the large current, Even when the cross-sectional area is increased, the volume of the molten conductor 13a at the time of interruption can be reduced, and scattering of the molten conductor 13a due to arc discharge can be reduced. The protective element 24 is formed by containing the high-melting-point metal and the low-melting-point metal so that the low-melting-point metal is melted before the melting of the high-melting-point metal to efficiently attract the usable conductor 13 And can be sucked into the hole 20.

When the detection circuit 36 detects an abnormal voltage of any one of the battery cells 31 to 34, it outputs a shutoff signal to the current control element 37. Then, the current control element 37 controls the current so as to energize the heating element 25. [ A current flows from the battery stack 35 to the heating element 25 through the first electrode 11, the usable conductor 13 and the front surface electrode 22 so that the heating element 25 generates heat . In the protection element 24, the usable conductor 13 is fused by the heat of the heating element 25, and the charge / discharge path of the battery stack 35 is cut off.

At this time, in the protection element 24, since the molten conductor 13a is attracted to the suction hole 20 via the surface electrode 22 by the capillary phenomenon, in order to cope with the application of the large current, The charge / discharge path of the battery pack 30 can be surely blocked even when the cross-sectional area is increased. The protective element 24 can be fused in a short time by utilizing the solubilization effect of the high melting point metal by the molten low melting point metal by forming the soluble conductor 13 by containing the high melting point metal and the low melting point metal .

In addition, in the protection element 24, since the feeding path to the heating element 25 is also cut off by the melting of the usable conductor 13, the heating of the heating element 25 is stopped.

The protection element 24 according to the present invention is not limited to the case where it is used for a battery pack of a lithium ion secondary battery, and can be applied to various applications requiring interruption of an electric current path by an electric signal.

[Second Embodiment]

[Configuration of Protection Device]

Next, a second embodiment will be described. 11A and 11B, the protection element 50 is provided between the first and second external electrodes 51 and 52 and between the first and second external electrodes 51 and 52 And a suction member 54 which is connected to the usable conductor 53 and sucks the molten conductor 53a of the usable conductor 53. [ The suction member 54 is formed of an insulating substrate 55 formed between the first and second external electrodes 51 and 52 and an insulating substrate 55 formed on the surface 55a of the insulating substrate 55, A heating element 57 formed on the insulating substrate 55 and a through hole 58 formed in the thickness direction of the insulating substrate 55 and continuous with the surface electrode 56 Respectively. In the protection element 50, the heating element 57 generates heat to melt the usable conductor 53. At this time, the protective element 50 sucks the molten conductor 53a in which the usable conductor 53 is molten by the sucking member 54 to reliably fuse the usable conductor 53 to the first external electrode 51) and the second external electrode (52).

The first and second external electrodes 51 and 52 are connection terminals for connecting the protection element 50 to an external circuit and are connected via the usable conductor 53 inside the protection element 50. [ The first and second external electrodes 51 and 52 are formed on the inside and the outside of the protection element 50 by being supported by the outer casing of the protection element 50. The first and second external electrodes 51 and 52 may be formed on the insulating substrate 55 of the suction member 54 or may be formed of an epoxy resin or the like adjacent to or integral with the insulating substrate 55 It may be formed on an insulating material.

The usable conductor 53 is melted by the overcurrent state and by the heat generated by the heating element 57 and can be a conductive material to be melted. For example, in addition to SnAgCu-based Pb-free solder, a BiPbSn alloy, BiPb alloy, BiSn alloy, SnPb alloy, PbIn alloy, ZnAl alloy, InSn alloy, PbAgSn alloy and the like can be used. The usable conductor 53 may be a laminate of a high melting point metal made of Ag or Cu or a metal mainly composed of Ag or Cu and a low melting point metal such as Pb free solder having Sn as a main component, A multilayer structure of four or more layers in which a melting point metal layer and a refractory metal layer are alternately stacked, or the like can be formed by various structures as will be described later.

The insulating substrate 55 is formed of a member having an insulating property such as alumina, glass ceramics, mullite, or zirconia, for example. In addition, a material used for a printed wiring board such as a glass epoxy substrate or a phenol substrate may be used, but it is necessary to pay attention to the temperature at the time of fusing.

The heating element 57 is made of, for example, W, Mo, Ru, or the like, having a relatively high resistance and having conductivity to generate heat when energized. A powder of the alloy or the composition thereof or the compound thereof is mixed with a resin binder or the like to form a paste, and a pattern is formed on the back surface 55b of the insulating substrate 55 by using a screen printing technique, do. The heating element 57 is connected at both ends to the first and second heating element electrodes 59 and 60. The first and second heating element electrodes 59 and 60 are formed on the back surface 55b of the insulating substrate 55 which is the same as the heating element 57. [ The first exothermic electrode 59 is connected to the usable conductor 53 via a heating element lead-out electrode 63 described later and the second exothermic electrode 60 is connected to the third external connection electrode 61 13), thereby connecting to a power source for generating heat of the heating element 57. [

The heating element 57 is covered with an insulating member 62 such as glass and the heating element lead-out electrode 63 is disposed so as to face the heating element 57 with the insulating member 62 interposed therebetween. The insulating member 62 may be a laminated substrate in which a heat generating body 57 is integrally laminated inside. The heating element 57 may be formed on both sides of the back electrode 64 or on one side of the back electrode 64 or on the back electrode 64 as well as on both sides of the back electrode 64 described later.

Surface electrodes 56 are formed on the surface 55a of the insulating substrate 55. The surface electrode 56 is connected to the usable conductor 53 connecting between the first and second external electrodes 51 and 52 via a connecting material such as solder. The surface electrode 56 is continuous with the through hole 58 formed in the thickness direction of the insulating substrate 55. The surface electrode 56 can be attracted to the through hole 58 by the capillary phenomenon when the solder conductor 53 is melted by the heat generated by the heat generating body 57 and the melted conductor 53a coagulates. Thus, even when the cross-sectional area of the usable conductor 53 is increased in order to cope with the application of a large current, the protective element 50 does not excessively flocculate the molten conductor 53a on the surface 55a of the insulating substrate 55 The current path between the first and second external electrodes 51 and 52 can be surely blocked.

As shown in Fig. 11 (A), the through-holes 58 are formed at the center in the width direction of the surface electrode 56. As shown in Fig. A plurality of through holes 58 may be formed. In this embodiment, a plurality of through holes 58 are formed in a straight line in a line.

On the inner peripheral surface of the through hole 58, a conductive layer 65 continuous with the surface electrode 56 is formed. The conductive layer 65 is, for example, a metal material in which the molten conductor 53a spreads wet, and is formed by a paste treatment, a plating treatment or the like. As a result, the protective element 50 can easily draw the molten conductor 53a agglomerated in the surface electrode 56 into the through hole 58, thereby attracting more molten conductor 53a.

The protection element 50 is formed with a back electrode 64 continuous with the through hole 58 and the conductive layer 65 in the back surface 55b of the insulating substrate 55. [ The protective element 50 is formed by forming the back electrode 64 so that the molten conductor 53a sucked into the through hole 58 along the conductive layer 65 is agglomerated in the back electrode 64, The conductor 53a can be sucked.

In addition, as described above, the above-described heating element 57 is formed in the vicinity of, for example, both sides, one side, or the periphery of the back-surface electrode 64. This allows the protection element 50 to efficiently heat the heating element 57 to the back electrode 64, the conductive layer 65 and the surface electrode 56 to quickly heat the usable conductor 53, It can be fused.

The protective element 50 is filled with a preliminary solder 66 having a melting point lower than that of the usable conductor 53 or a material which is the same or similar to that of the usable conductor 53 in part or all of the through hole 58. [ The temperature of the back surface 55b side of the insulating substrate 55 becomes higher than the temperature of the surface 55a side and the surface of the conductive layer 65 and the front surface electrode 56 and the back electrode 64 and the heating element lead-out electrode 63 become higher in temperature than the insulating substrate 55 so that they are melted before the usable conductor 53 and then the melted conductor 53a is passed through the through- . Thereby, the molten conductor 53a moves from the surface 55a of the insulating substrate 55 to the back surface 55b so that the distance between the first external electrode 51 and the second external electrode 52 The current path can be surely blocked.

The heating element lead-out electrode 63 formed on the back surface 55b of the insulating substrate 55 overlaps and is electrically connected to the back electrode 64 of the back surface 55b. The heating element lead-out electrode 63 is connected to the usable conductor 53 via the back electrode 64, the through hole 58, the preliminary solder 66 and the front surface electrode 56, 63a are connected to the first heating element electrode 59.

The outer surface of the surface electrode 56 on the surface 55a of the insulating substrate 55 is provided with the island-like electrodes 67a and 67b separated therefrom. The insulator electrodes 67a and 67b are formed in such a manner that a portion of the molten conductor 53a is connected to the surface electrode 56 and the first and second external electrodes 51 and 52 by the wettability when the usable conductor 53 is fused. Keep it separated.

In the protective element 50 as described above, the heat generating body 57 is formed on the back surface 55b side of the insulating substrate 55, so that when the heat generating body 57 generates heat, the back surface 55b side faces the surface 55a side The temperature becomes higher. The conductive layer 65, the surface electrode 56 and the back electrode 64 and the heating element lead-out electrode 63 are generally conductive materials such as copper patterns and are excellent in heat conductivity. The rear surface electrode 64 of the back surface 55b is formed between the heating elements 57 so that the heat of the heating elements 57 is efficiently transmitted. The protective element 50 can attract more molten conductor 53a to the back surface 55b side of the insulating substrate 55 and increase the cross sectional area of the usable conductor 53 in order to cope with a large current, The soluble conductor 53 can be stably fused even when the melting amount of the melting conductor 53a at the time of melting increases.

The protection element 50 is formed by filling the through hole 58 with the preliminary solder 66 so that the conductive layer 65 and the surface electrode 56 and the back electrode 64 and the heating element lead- The temperature of the solder 66 is higher than the temperature of the substrate 55 so that the preliminary solder 66 is melted before the usable conductor 53 and the molten conductor 53a can be attracted to the through hole 58. [ As a result, the molten conductor 53a is efficiently sucked from the surface 55a of the insulating substrate 55 to the back surface 55b, so that the gap between the first external electrode 51 and the second external electrode 52 It is possible to reliably cut off the current path of the transistor. The suction member 54 may be filled with some or all of the through holes 58 in place of the preliminary solder 66 or in place of the preliminary solder 66. [ By filling the flux, the wettability of the usable conductor 53 can be increased, and the molten conductor 53a can be attracted to the through hole 58 efficiently.

[How to use the protection device]

The protection element 50 is used in a circuit in the battery pack 30 of the above-described lithium ion secondary battery, as shown in Fig. The protection element 50 is connected to the charge and discharge current path between the battery stack 31 and the charge and discharge control circuit 32 in the same manner as the protection element 10 and its operation is connected to the current control element 34 .

In the battery pack 30, the protection element 50 has a circuit configuration as shown in Fig. That is, the protective element 50 is connected to the surface electrode 56 formed on the surface 55a of the insulating substrate 55, and is connected to the first and second external electrodes 51 and 52, And a heating element 57 which melts the usable conductor 53 by energizing and generating heat via the surface electrode 56. [ The heating element 57 has one end connected to the surface electrode 56 via the first heating element electrode 59, the heating element lead-out electrode 63, the back electrode 64 and the conductive layer 65, Is connected to the third external connection electrode (61) via the heating element electrode (60). In the protective element 50, the usable conductor 53 is connected in series on the charging and discharging current path between the first and second external electrodes 51 and 52, and the heating element 57 is connected to the surface electrode 56 And is connected to the current control element 34 via the third external connection electrode 61. [

When the voltage value of the battery cells 31 to 34 becomes a voltage exceeding a predetermined overdischarge or overcharge state, the current control element 37 is connected to the protection element 50 To control the charging / discharging current path of the battery stack 35 to shut off regardless of the switching operation of the current control devices 41 and 42. [ Specifically, the heating element 57 of the protection element 50 generates heat to heat the preliminary solder 66 in the usable conductor 53 and the through hole 58 as shown in Fig. 14 (A). At this time, the temperature of the insulating substrate 55 on the side of the back surface 55b on which the heat generating body 57 is arranged becomes higher than that on the surface 55a side. The conductive layer 65 of the back electrode 64 on the side of the back surface 55b of the insulating substrate 55 and the heating electrode lead-out electrode 63 and the through hole 58 and the surface electrode 55a of the surface 55a of the insulating substrate 55, (56) is superior in thermal conductivity to an insulating substrate (55) such as a ceramic.

Therefore, the heat of the heating body 57 is mainly generated by the back electrode 64 formed between the heating bodies 57, the heating element withdrawing electrode 63 on the heating body 57, the conductive layer 65 of the through hole 58, Is transferred to the surface 55a of the insulating substrate 55 by the path of the surface electrode 56 of the lead 55a to melt the preliminary solder 66 and the usable conductor 53 in the path. Of course, although the efficiency of the usable conductor 53 is lowered, it is melted by the heat transmitted through the insulating layer of the insulating substrate 55 or the like. 14 (B), the preliminary solder 66 starts to melt earlier than the usable conductor 53, and the surface electrode 56, the conductive layer 65, the back electrode 64, The wettability of the lead electrode 63 moves to the backside 11b of the insulating substrate 55 and the soluble conductor 53 which is behind the preliminary solder 66 and melted is also attracted to the through hole 58 To the back surface 55b side of the insulating substrate 55, as shown in Fig. A part of the molten conductor 53a is also held on the island-shaped electrodes 67a and 67b on the surface 55a of the insulating substrate 55 (see arrows in Fig. 14 (A)). Thereby, the protection element 50 can reliably fuse the usable conductor 53 on the current path between the first and second external electrodes 51 and 52.

The protection element 50 of the present invention can prevent the availability of the usable conductor 53 (solder) by guiding a large amount of the usable conductor 53 (solder) from the surface 55a to the backside 55b of the insulating substrate 55, Can be easily fused. Here, in order to confirm whether or not the usable conductor 53 can be stably fused regardless of the attitude in which the protection element 50 is arranged, the experiments shown in Figs. 15 and 16 were carried out. Here, Fig. 16 shows the relationship between each posture and the firing time of the protective element 50 of the present invention shown in Figs. 15 (A) - (E). Here, the protection element 50 is operated at 15 W.

15A shows a protective element 50 mounted on the surface 55a side of the insulating substrate 55 with the upper surface facing down and the back surface 55b side of the insulating substrate 55 facing downward. Fig.

15B shows a state in which the protection element 50 is inverted from the posture of FIG. 15A by 90 degrees so that the through hole 58 is directed in the horizontal direction, and the second external electrode 52, Fig. 5 is a side view showing a state after fusing of the protection element 50 in which the usable conductor 53 is supported in the up-and-down direction upward.

15 (C) again rotates 90 degrees from the posture of Fig. 15 (B) so that the through holes 58 are arranged in parallel in the vertical direction, and the protection element 50 after firing.

Fig. 15 (D) shows a state in which the posture of Fig. 15 (A) faces backward. 5 is a plan view showing a state after fusing of the protection element 50 in which the surface 55a side of the insulating substrate 55 is faced down and the back surface 55b side of the insulating substrate 55 is faced upward.

15E shows a state in which the insulating substrate 55 is rotated in the in-plane direction by 45 degrees from the posture in which the first external electrode 51 is held upside, the through holes 58 are arranged in an inclined manner, 53 after the fuse is blown.

As shown in Fig. 16, it can be confirmed that the protection element 50 of the present invention is capable of reliably fusing the usable conductor 53 without any variation in the fusing time, regardless of the posture.

Fig. 17 is a protective element 100 as a comparative example of the present invention, showing a coagulation method. 17A and 17B, the protective element 100 includes an insulating substrate 101 and first and second external electrodes 101 and 102 formed on ends of the surface 101a of the insulating substrate 101, The first external electrode 102 and the second external electrode 103 are laminated over the first and second external electrodes 102 and 103 and the heating element 104 formed on the surface 101a of the insulating substrate 101, And a usable conductor 105 for heating the current path between the first external electrode 102 and the second external electrode 103 by heating by the heating element 104. [ The heating element 104 includes first and second heating element electrodes 106 and 107 which are connected to a power source so that both ends of the heating element 104 are formed on the surface 101a of the insulating substrate 101, Respectively.

The first and second heating element electrodes 106 and 107 are formed on the surface 101a of the insulating substrate 101. [ The first heating element electrode 106 is connected to the heating element 104 and connected to the tab 108a of the heating element withdrawing electrode 108. [ The second heating element electrode 107 is connected to the heating element 104 and to an external connection electrode (not shown).

One end of the heating element lead-out electrode 108 is connected to the usable conductor 105 and the other end thereof is connected to the first heating element electrode 106 by the tab 108a of the heating-element lead-out electrode 108. [ In addition, on the outside of the heating element 104, the island-shaped electrodes 109a and 109b are formed so as to be separated from the heating element 104. [ The insulator electrodes 109a and 109b hold the molten conductor 105a in which the soluble conductor 105 has melted by the wettability when the usable conductor 105 has been fused so that the first external electrode 102 and the second The current path between the external electrodes 103 is fused. That is, the protective element 100 does not have a through hole formed in the insulating substrate 101, and the molten conductor 105a does not move to the back surface 101b of the insulating substrate 101. [

This protection element 100 is also used in the same way as the protection element 50. The protection element 50 is designed so that the voltage value of the battery cells 31 to 34 The current control element 37 operates the protection element 100 to switch the charge and discharge current path of the battery stack 35 to the current control elements 41 and 42 Regardless of the switch operation of the switch. As a result, the heating element 104 generates heat to melt the usable conductor 105 as shown in Fig. 17 (C), and a part of the molten conductor 105a is held in the island-shaped electrodes 109a and 109b, .

19 shows the relationship between the posture of the protective element 100 and the fusing time, which is a reference example. Here, the protection element 100 is operated at 15 W. Each of the postures in Figs. 18A to 18E corresponds to the postures in Figs. 15A to 15E.

18A shows a state after the firing of the protective element 100 placed on the side of the surface 101a of the insulating substrate 101 facing upward and with the back surface 101b side of the insulating substrate 101 facing downward Fig.

18B shows a state in which the protection element 100 is raised by 90 degrees from the posture of Fig. 18A to protect the usable conductor 105 in the up-and-down direction with the first external electrode 102 facing upward Fig. 8 is a side view showing the state after the element 100 is fused.

18C is a side view showing the state after the fuse of the protection element 100 in which the usable conductor 105 is supported in the horizontal direction by rotating 90 degrees from the posture of Fig. 18B again.

Fig. 18 (D) shows a state in which the posture of Fig. 18 (A) faces backward. 11 is a plan view showing a state after fusing of the protection element 100 in which the surface 101a side of the insulating substrate 101 is downward and the rear surface 101b side of the insulating substrate 101 is placed upward.

18E shows the protective element 100 in which the insulating substrate 101 is rotated 45 degrees in the in-plane direction from the attitude in which the first external electrode 102 is held upside and the usable conductor 105 is supported in an inclined manner, Fig.

19 shows the fusing time of the usable conductor 105 when the protective element 100 of the present invention is set to the same attitude as shown in Figs. 18 (A) - (E).

As shown in Fig. 19, it can be seen that the protective element 100 of the comparative example has a large deviation in the fusing time according to the wiring posture of the protection element 100. [ In other words, the protective element 50 of the present invention can reduce the deviation of the fusing time regardless of the attitude as compared with the protection element 100 of the reference example, and thus can be reliably used The conductor 53 can be fused.

20, the through holes 58 may be formed in two rows as shown in Fig. 20 (A), in addition to the case where they are formed in a line in a straight line as shown in Fig. 11 (B) , Or more. Further, as shown in Fig. 20 (B), the slit 58a may be formed as a slit 58a instead of a plurality of through holes.

[Heating element]

As shown in Fig. 21, the protection element to which the present invention is applied may be a suction member 70 in which a heating element 57 is formed on the surface 55a side of the insulating substrate 55. Fig. In the following description, the same members as those of the above-described protection element 50 are denoted by the same reference numerals, and the details thereof are omitted. The protection element 71 using the suction member 70 formed on the side of the surface 55a of the insulating substrate 55 has a structure in which the heating element 57 is formed on the surface 55a of the insulating substrate 55 And is covered with an insulating member 62.

The heating element 57 is connected to the first and second heating element electrodes 59 and 60 formed on the surface 55a of the insulating substrate 55 at both ends thereof. The first heating element electrode 59 is connected to the usable conductor 53 through the heating element lead-out electrode 63 so that the heating element 57 is connected to the usable conductor 53. The second heating element electrode 60 is connected to the third external connection electrode 61 (see Figs. 12 and 13), and is thereby connected to the power source for generating the heating element 57.

The heating element 57 is covered by the insulating member 62 and the heating element lead-out electrode 63 is arranged so as to face the heating element 57 via the insulating member 62. The insulating member 62 may be a laminated substrate in which a heat generating body 57 is integrally laminated inside. The heating element 57 may be formed on both sides of the surface electrode 56 or on only one side of the surface electrode 56 or the surface electrode 56.

The heating element lead-out electrode 63 is formed on the surface 55a of the insulating substrate 55 so as to overlap with the heating element 57 with the insulating member 62 interposed therebetween. The heating element lead-out electrode 63 is connected to the usable conductor 53 via the surface electrode 56 and the tab 63a formed at one end is connected to the first heating element electrode 59. [

The protection element 71 is formed with the through hole 58 and the conductive layer 65 and the back electrode 64 in the same manner as the protection element 50 described above, The preliminary solder 66 may be filled in a part or the entirety of the substrate. The suction member 70 may be filled with some or all of the through holes 58 in place of the preliminary solder 66 or the preliminary solder 66. [ By filling the flux, the wettability of the usable conductor 53 can be increased, and the molten conductor 53a can be attracted to the through hole 58 efficiently.

The protection element 71 can efficiently transmit heat to the usable conductor 53 when the heating element 57 generates heat by forming the heating element 57 on the surface 55a side of the insulating substrate 55, It is possible to quickly fuse the usable conductor 53. At the initial stage of generation of heat, the protection element 71 has a temperature gradient higher on the side of the surface 55a side of the insulating substrate 55 than on the side of the back side 55b. The protection element 71 is formed in such a manner that the molten conductor 53a is aggregated on the high-temperature surface electrode 56 and is held in the through-hole 58 via the conductive layer 65 continuous with the surface electrode 56 It is possible to suck the melted conductor 53 quickly. Even when a large amount of the molten conductor 53a having a large cross-sectional area is melted, the solder conductor 53 can be melted with reliability.

[Example]

The protective element 71 of the present invention can easily transfer the usable conductor 53 from the surface 55a to the back surface 55b of the insulating substrate 55 by carrying a large amount of the usable conductor 53, You can fry it. Here, in order to confirm whether or not the usable conductor 53 can be stably fused regardless of the posture in which the protection element 71 is disposed, the experiments shown in Figs. 22 and 23 were carried out. The protective element 71 used in the experiment was formed with a through hole 58 of 0.85? On an alumina-based substrate having a thickness of 0.635 mm as an insulating substrate 55 and subjected to Ni / Au plating on its inner surface. As the usable conductor 53, a Sn-Ag-Cu-based metal foil having a thickness of 0.35 mm was subjected to Ag plating treatment with a thickness of 6 占 퐉.

The fusing time of the usable conductor 53 in each attitude shown in Fig. 22 when such a protection element 71 was operated at 31 W was measured. Here, Fig. 23 shows the relationship between each posture and the fusing time of the protection element 71 of the present invention shown in Figs. 22 (A) - (E). Each of the postures in Figs. 22A to 22E corresponds to the postures in Figs. 15A to 15E.

22A shows a state after fusing of the protection element 71 placed with the front surface 55a side of the insulating substrate 55 facing upward and the rear surface 55b side of the insulating substrate 55 facing downward, Fig.

22B shows a state in which the protection element 71 is inclined by 90 degrees from the posture of Fig. 22A so that the through hole 58 is directed horizontally and the second external electrode 52 is moved upward And a protective element 71 which supports the usable conductor 53 in the up-and-down direction.

22 (C) again rotates 90 degrees from the posture shown in Fig. 22 (B) so that the through holes 58 are arranged in parallel in the vertical direction, and the protection element 71 after fusing.

22 (D) shows a state in which the posture of Fig. 22 (A) is directed backward. 5 is a plan view showing a state after fusing of the protection element 71 in which the surface 55a side of the insulating substrate 55 is faced down and the back surface 55b side of the insulating substrate 55 is faced upward.

22E shows a state in which the insulating substrate 55 is rotated in the in-plane direction by 45 degrees from the posture in which the second external electrode 52 is held upside, the through holes 58 are arranged in an inclined manner, 53 after the fuse has been fused.

As shown in Fig. 23, it can be seen that the protection element 71 of the present invention can reliably blow the usable conductor 53 without any variation in the fusing time, regardless of the posture.

The protection element to which the present invention is applied may be formed inside the insulating substrate 55 in addition to forming the heating element 57 on the surface 55a or the back surface 55b of the insulating substrate 55. [ The heating element 57 does not need to be covered with the insulating member 62 and the heating element 57 is connected to the surface electrode 56 or the back electrode 64 through the conductive layer 65. In this case,

[Agglomeration Member]

The protective element to which the present invention is applied may also use a coagulating member 75 that cools the molten conductor 53a and assists in melting the usable conductor 53 in addition to the attracting members 54 and 70. [ 24A and 24B are cross-sectional views of a protection element 74 in which a suction member 70 and a condensation member 75 are used in combination. 24A and 24B, the cohesive member 75 includes a second insulating substrate 76, a heating element 77 formed on the surface 76a of the second insulating substrate 76, An insulating member 78 covering the heating element 77 and a current collecting electrode 79 laminated on the insulating member 78 and coherent with the molten conductor 53a.

The aggregating member 75 is formed by stacking the insulating substrate 55, the heating element 57 and the insulating member 62 of the protection element 50 as the second insulating substrate 76, the heating element 77 and the insulating member 78 The same member can be used. The collector electrode 79 can be formed, for example, by printing and firing a high melting point metal paste such as Ag or Cu.

Fig. 25 shows a circuit diagram of the protection element 74. Fig. The heating member 77 is electrically connected to the third external connection electrode 61 via a heating element electrode (not shown), and the current control element (not shown) formed in the external circuit 37, etc., the energization is controlled by interlocking with the exothermic body 57 of the suction member 70. The heating member 77 of the aggregating member 75 is connected to the collector electrode 79 through a heating element electrode not shown and is electrically connected to the usable conductor 53 via the collector electrode 79 .

The aggregating member 75 is connected to the surface of the usable conductor 53 on the side opposite to the surface on which the suction member 70 is formed. When the heating element 57 of the suction member 70 is energized and heated, the heating element 77 of the coagulation member 75 is also energized and generates heat so that the usable conductor 53 is allowed to flow from both sides By heating, it melts quickly.

At this time, the protective element 74 sucks the molten conductor 53a into the through hole 58 by the suction member 70, and the molten conductor 53a is discharged from the collecting member 75 to the collector electrode 79, the allowable amount for sucking and holding the molten conductor 53a is increased. Therefore, even when a large amount of the molten conductor 53a is generated, the protective element 74 can be surely fused by using the flexible conductor 53 having a large cross-sectional area and increased in tangent stiffness, The characteristics can be maintained and improved.

In addition, the protective element 74 can quickly fuse the usable conductor 53 even when a covering structure in which the low melting point metal constituting the inner layer is covered with the high melting point metal is used as the usable conductor 53. That is, the permissible conductor 53 coated with the refractory metal requires time to heat the refractory bodies 57 and 77 to a temperature at which the refractory metal in the outer layer is melted. Here, the protective element 74 has the suction member 54 and the coagulation member 75, and at the same time, by heating the heating elements 57 and 77, the high melting point metal in the outer layer can be rapidly heated to the melting temperature . Therefore, according to the protection element 74, the thickness of the refractory metal layer constituting the outer layer can be increased, and the fast winding characteristics can be maintained while further increasing the fixing strength.

It is preferable that the protection element 74 opposes the collector electrode 79 of the aggregating member 75 to the through hole 58 of the suction member 70. This allows more melted conductors 53a to gather on the through holes 58 to efficiently attract the molten conductor 53a into the through holes 58 and to rapidly melt the usable conductors 53 .

[Multiple suction members]

26A and 26B, the protection element to which the present invention is applied may include a plurality of suction members 54 and 70 and may be disposed on the front surface and the back surface of the usable conductor 53. 26, for example, the above-described suction member 54 is disposed on the front surface and the back surface of the usable conductor 53, respectively. 27 is a circuit diagram of the protection element 80. Fig. Each sucking member 54 formed on the front and back surfaces of the usable conductor 53 is connected to one end of the heating element 57 via the usable conductor 53 via the first heating element electrode 59 and the heating element withdrawing electrode 63, And the other end of the heating element 57 is connected to a power source for heating the heating element 57 via the second heating element electrode 60 and the third external connection electrode 61. [

The heating element 57 of each of the suction members 54 and 54 emits heat and the molten conductor 53 is sucked into each of the through holes 58 when the usable conductor 53 is fused . Therefore, even if a large amount of the molten conductor 53a is generated by increasing the cross-sectional area of the usable conductor 13 in order to cope with the application of a large current, the protection element 80 is attracted by the plurality of the attracting members 54, The usable conductor 53 can be fused. The protection element 80 can blow the soluble conductor 53 more quickly by drawing the molten conductor 53a by the plurality of suction members 54. [

The protective element 80 can quickly fuse the usable conductor 53 even when a covering structure in which the low melting point metal constituting the inner layer is covered with the high melting point metal is used as the usable conductor 53. [ That is, the permissible conductor 53 coated with the refractory metal requires time to heat the refractory 57 to a temperature at which the refractory metal in the outer layer is melted, even when the heating element 57 generates heat. Here, the protection element 80 includes a plurality of suction members 54, and at the same time, the heating elements 57 are heated, whereby the high-melting-point metal in the outer layer can be rapidly heated to the melting temperature. Therefore, according to the protection element 80, the thickness of the refractory metal layer constituting the outer layer can be increased, and the fast winding characteristics can be maintained while further increasing the fixing strength.

26, it is preferable that the pair of suction members 54, 54 are connected to the usable conductor 53 so as to be opposed to each other. As a result, the protection element 80 can simultaneously heat the same point of the usable conductor 53 from both sides of the movable conductor 53 with the pair of suction members 54, 54 and suck the molten conductor 53a, The usable conductor 53 can be quickly heated and fused.

The protective element 80 may be formed in such a manner that the heating member 57 as the suction member uses the suction member 54 formed on the back surface 55b side of the insulating substrate 55, A plurality of suction members 70 formed on the surface 55a side of the suction members 55 may be used or both suction members 54 and 70 may be used in combination.

[Composition of available conductor]

As described above, the usable conductors 13 and 53 may contain a low melting point metal and a high melting point metal. As the low-melting-point metal, it is preferable to use a solder such as Pb-free solder containing Sn as a main component, and as the high-melting-point metal, Ag, Cu or an alloy mainly composed of them is preferably used. At this time, as shown in Fig. 28 (A), the usable conductors 13 and 53 may be made of an usable conductor in which a refractory metal layer 90 is formed as an inner layer and a refractory metal layer 91 is formed as an outer layer . In this case, the usable conductors 13 and 53 may have a structure in which the entire surface of the refractory metal layer 90 is covered with the refractory metal layer 91, It may be. The covering structure of the refractory metal layer 90 or the low melting point metal layer 91 can be formed by a known film forming technique such as plating.

As shown in Fig. 28 (B), the usable conductors 13 and 53 may use an available conductor in which a low melting point metal layer 91 is formed as an inner layer and a refractory metal layer 90 is formed as an outer layer. In this case also, the usable conductors 13 and 53 may have a structure in which the entire surface of the low melting point metal layer 91 is covered with the high melting point metal layer 90, Structure.

29, the usable conductors 13 and 53 may have a laminated structure in which a refractory metal layer 90 and a refractory metal layer 91 are laminated.

In this case, as shown in Fig. 29 (A), the usable conductor 13 is formed so that the first and second electrodes 11 and 12, the surface electrode 22, and the first and second external electrodes 51 and 52 Melting metal layer 91 which is an upper layer formed on the upper surface of the refractory metal layer 90 which is formed as a two-layer structure including a lower layer connected to the surface electrode 56 and an upper layer laminated on the lower layer, The high melting point metal layer 90 serving as the upper layer may be laminated on the upper surface of the low melting point metal layer 91 which is the lower layer. Alternatively, the usable conductors 13 and 53 may be formed as a three-layer structure composed of an outer layer laminated on the upper and lower surfaces of the inner layer and the inner layer as shown in Fig. 29 (B) A low melting point metal layer 91 serving as an outer layer may be laminated on the upper and lower surfaces of the low melting point metal layer 91 serving as an inner layer and a high melting point metal layer 90 serving as an outer layer.

As shown in Fig. 30, the usable conductors 13 and 53 may have a multilayer structure of four or more layers in which the refractory metal layer 90 and the refractory metal layer 91 are alternately laminated. In this case, the usable conductors 13 and 53 may be covered with a metal layer constituting the outermost layer except for the entire surface or a pair of side surfaces opposed to each other.

The fusible conductors 13 and 53 may be partially laminated with a refractory metal layer 90 in the form of a stripe on the surface of the low melting point metal layer 91 constituting the inner layer. 31 is a plan view of the usable conductors 13 and 53. Fig.

The usable conductors 13 and 53 shown in Fig. 31 (A) are formed by forming a plurality of line-shaped refractory metal layers 90 in the longitudinal direction on the surface of the low melting point metal layer 91 at predetermined intervals in the width direction, And a low-melting-point metal layer 91 is exposed from the opening 92. In this case, The available conductors 13 and 53 are formed such that the contact area between the melted low melting point metal and the high melting point metal is increased by exposing the low melting point metal layer 91 from the opening 92 to increase the erosion action of the high melting point metal layer 90 So that the solubility can be improved. The opening 92 can be formed, for example, by subjecting the low melting point metal layer 91 to partial plating of a metal constituting the high melting point metal layer 90. [

As shown in Fig. 31 (B), the conductor layers 13 and 53 are formed on the surface of the low-melting-point metal layer 91 in such a manner that a line-shaped high-melting-point metal layer 90 extends in the width direction A plurality of line-shaped openings 92 may be formed along the width direction.

32, the fusible conductors 13 and 53 are formed by forming a refractory metal layer 90 on the surface of the refractory metal layer 91 and covering the entire surface of the refractory metal layer 90 A circular opening 93 may be formed and the low melting point metal layer 91 may be exposed from the opening 93. [ The opening 93 can be formed by, for example, applying a partial plating of a metal constituting the high melting point metal layer 90 to the low melting point metal layer 91. [

The available conductors 13 and 53 are formed by exposing the low melting point metal layer 91 from the opening 93 so that the contact area between the molten low melting metal and the high melting point metal is increased to further promote the erosion action of the high melting metal It is possible to improve the solubility.

33, a plurality of openings 94 are formed in the refractory metal layer 90 serving as an inner layer and the refractory metal layer 90 is plated with a plating technique or the like The low melting point metal layer 91 may be formed and filled in the opening 94. As a result, in the usable conductors 13 and 53, the area of the melting low-melting metal contacting the high-melting-point metal is increased, so that the low-melting-point metal can be melted in a shorter period of time.

It is preferable that the usable conductors 13 and 53 have a volume of the low melting point metal layer 91 larger than that of the high melting point metal layer 90. The usable conductors 13 and 53 are heated by the heat generated by the heating elements 25 and 57 and the low melting point metal is melted to allow the high melting point metal to be melted so that it can be quickly melted and fused. Therefore, the soluble conductors 13 and 53 are formed so that the volume of the low melting point metal layer 91 is larger than the volume of the high melting point metal layer 90, , 12, or between the first and second external electrodes 51, 52.

As shown in Fig. 34, the usable conductors 13 and 53 are formed in a substantially rectangular plate shape, and are covered with a refractory metal constituting the outer layer, A first side edge portion 97 and a pair of second side edge portions 98 opposed to each other which are formed to be thinner than the first side edge portion 97 by exposing the low melting point metal constituting the inner layer do.

The first side edge portion 97 is covered by the refractory metal layer 90 on the side surface and is formed thicker than the main surface portion 96 of the usable conductors 13 and 53 by the side surface. On the side surface of the second side edge portion 98, a low melting point metal layer 91 surrounded by the high melting point metal layer 90 is exposed. The second side edge portion 98 is formed to have the same thickness as that of the main side surface portion 96 except for both end portions adjacent to the first side edge portion 97.

In the protective element 1, the usable conductor 13 has the first side edge portion 97 mounted along the width direction of the first and second electrodes 11 and 12, and the second side edge portion 98 Are connected across the first and second electrodes 11 and 12 in the direction in which they are at both side ends in the energizing direction. Likewise, in the protection element 50, the usable conductor 53 is formed such that the first side edge portion 97 is mounted along the width direction of the first and second external electrodes 51 and 52, And the edge portions 98 are connected between the first and second external electrodes 51 and 52 in the direction of both side ends in the energizing direction.

Thereby, the protective elements 1 and 50 can quickly blow out the usable conductors 13 and 53, thereby blocking the current path of the external circuit.

That is, the second side edge portion 98 is formed to be relatively thinner than the first side edge portion 97. The side surface of the second side edge portion 98 is exposed with the low melting point metal layer 91 constituting the inner layer. As a result, the second side edge portion 98 is formed in such a manner that the solubility of the refractory metal layer 90 by the low melting point metal layer 91 acts and the thickness of the refractory metal layer 90, The first side edge portion 97 formed by the high melting point metal layer 90 can be quickly melted with a small amount of thermal energy because the second side edge portion 97 is formed thinner than the first side edge portion 97 formed by the high melting point metal layer 90. [ On the other hand, the first side edge portion 97 is thickly covered by the refractory metal layer 90 and requires a large amount of heat energy until it is fused as compared with the second side edge portion 98. [

Therefore, the protective elements 1 and 50 are arranged between the first electrode 11 and the second electrode 12 immediately adjacent to the second side edge portion 98 due to the heat generated by the heating elements 25 and 57, 1 between the external electrode 51 and the second external electrode 52 is fused. Thus, the protective elements 1 and 50 are electrically connected to the first and second electrodes 11 and 12 or between the first and second external electrodes 51 and 52 while blocking the charge and discharge paths between the first and second electrodes 11 and 12, , 57 are cut off, and the heat generation of the heat generating elements 25, 57 is stopped.

The usable conductors 13 and 53 having such a configuration are manufactured by coating a low melting point metal foil such as a solder foil constituting the low melting point metal layer 91 with a metal such as Ag constituting the high melting point metal layer 90 . As a method of coating a low-melting-point metal foil with a high-melting-point metal, an electrolytic plating method capable of continuously carrying out high-melting-point metal plating on a long-melting-point low melting point metal foil is advantageous in terms of work efficiency and manufacturing cost.

When the high-melting-point metal plating is performed by electrolytic plating, the electric field intensity becomes relatively strong at the edge portion, that is, the side edge portion of the elongated-phase low melting point metal foil, and the refractory metal layer 90 is thickly plated (see FIG. 34) . Thereby, a longitudinally elongated conductive ribbon 95 is formed in which the side edge portion is thickened by the refractory metal layer. Subsequently, the conductor ribbon 95 is cut into a predetermined length in a width direction perpendicular to the longitudinal direction (direction C-C 'in FIG. 34) to produce the usable conductors 13 and 53. The side edges of the conductor ribbons 95 serve as the first side edge portions 97 and the cut surfaces of the conductor ribbons 95 serve as the second side edge portions 98. [ The first side edge portion 97 is covered with a refractory metal and the second side edge portion 98 is covered with a pair of upper and lower refractory metal layers 90 And the refractory metal layer 90 surrounded by the refractory metal layer 90 are exposed to the outside.

1 Protection element,
10 First insulating substrate,
10a surface,
10b,
11 first electrode,
11a First external connection electrode,
11b conductive layer,
12 second electrode,
12a second external connection electrode,
12b conductive layer,
13 Available conductors,
13a molten conductor,
14 flux,
15 cover member,
20 suction ball,
21 conductive layer,
22 surface electrode,
23 back electrode,
24 Protection element,
25 heating element,
26 insulating layer,
27 third external connection electrode,
30 Battery pack,
30a positive terminal,
30b negative terminal,
31 ~ 34 Battery cell,
35 Battery Stack,
36 detection circuit,
37 Current control device,
40 charge / discharge control circuit,
41, 42 Current control device,
43 control unit,
50 Protection element,
51 a first outer electrode,
52 second outer electrode,
53 available conductors,
53a molten conductor,
54 suction member,
55 Insulation member,
55a surface,
55b,
56 surface electrode,
57 heating element,
58 through hole,
59 First heating element electrode,
60 second heating element electrode,
61 third external connection electrode,
62 Insulation member,
63 heating element extraction electrode,
63a tab,
64 is an electrode,
65 conductive layer,
66 pre-solder,
67 Thyristor Electrode,
70 suction member,
71 Protection element,
74 Protection element,
75 agglomerated member,
76 second insulating substrate,
77 Heating element,
78 insulating member,
79 collector electrode,
80 protection device,
90 refractory metal layer,
91 Low melting point metal layer,
95 conductor ribbon,
97 first side edge portion,
98 second side edge portion

Claims (53)

A first insulating substrate;
And an available conductor mounted on a surface of the first insulating substrate,
And a suction hole for sucking the melted solder is opened on the surface of the first insulating substrate. The method according to claim 1,
Wherein the suction hole is a through hole or a non-through hole formed in the thickness direction of the first insulating substrate, the conductive layer being formed on the inner surface thereof. 3. The method of claim 2,
And a surface electrode connected to the conductive layer is formed on a surface of the first insulating substrate. The method of claim 3,
The suction hole is a through hole,
And a back electrode connected to the conductive layer is formed on a back surface of the first insulating substrate. 5. The method according to any one of claims 1 to 4,
And one or a plurality of the suction holes are formed. 5. The method according to any one of claims 1 to 4,
Wherein the first insulating substrate has first and second electrodes connected to the usable conductor,
Wherein the first and second electrodes are connected to an external connection electrode formed on a back surface of the first insulating substrate. The method according to claim 6,
Wherein a heating element for melting the usable conductor is formed on the first insulating substrate. 8. The method of claim 7,
Wherein said heating element is formed on a surface of said first insulating substrate and overlaps with said usable conductor via an insulating member. 8. The method of claim 7,
Wherein the heating element is formed on a back surface of the first insulating substrate and overlaps with the usable conductor. 8. The method of claim 7,
Wherein the heating element is formed inside the first insulating substrate. The method according to claim 3 or 4,
A heating element for melting the usable conductor is formed on the first insulating substrate,
Wherein the heating element is connected to the usable conductor via the surface electrode. 12. The method of claim 11,
Wherein the first insulating substrate has first and second electrodes connected to the usable conductor,
Wherein the first and second electrodes are connected to an external connection electrode formed on a back surface of the first insulating substrate. 13. The method of claim 12,
Wherein said heating element is formed on a surface of said first insulating substrate and overlaps with said usable conductor via an insulating member. 13. The method of claim 12,
Wherein the heating element is formed on a back surface of the first insulating substrate and overlaps with the usable conductor. 5. The method according to any one of claims 1 to 4,
And a flux is applied to a surface of the usable conductor. 5. The method according to any one of claims 2 to 4,
Wherein the conductive layer comprises any one of copper, silver, gold, iron, nickel, palladium, lead, and tin as main components. 5. The method according to any one of claims 1 to 4,
And the usable conductor is solder. 5. The method according to any one of claims 1 to 4,
Wherein the usable conductor contains a low melting point metal and a high melting point metal. 19. The method of claim 18,
Wherein the low melting point metal is solder,
Wherein the refractory metal is an alloy mainly composed of silver, copper, or silver or copper. 19. The method of claim 18,
Wherein the permissible conductor is an inner layer of the refractory metal and the outer layer is a coating structure of the refractory metal. 19. The method of claim 18,
Wherein the usable conductor has a structure in which the inner layer is the low melting point metal and the outer layer is the coating structure of the high melting point metal. 19. The method of claim 18,
Wherein the usable conductor is a laminated structure in which the low melting point metal and the high melting point metal are laminated. 19. The method of claim 18,
Wherein the permissible conductor is a multilayer structure of four or more layers in which the low melting point metal and the high melting point metal are alternately laminated. 19. The method of claim 18,
Wherein the usable conductor has an opening formed in the refractory metal formed on the surface of the low melting point metal constituting the inner layer. 19. The method of claim 18,
Wherein the usable conductor has a refractory metal layer having a plurality of openings and a refractory metal layer formed on the refractory metal layer and the opening is filled with the refractory metal. 19. The method of claim 18,
Wherein the fusible conductor comprises a pair of first side edge portions which are covered with the refractory metal constituting the outer layer and which are formed so as to be thicker than the main surface portion and a second side edge portion which is formed by exposing the low- And a pair of second side edge portions opposed to each other formed to have a thickness thinner than the edge portion,
Wherein the first side edge portion is mounted along the first and second electrodes formed on the surface of the first insulating substrate, and the second side edge portion is connected across the first and second electrodes. 19. The method of claim 18,
And the usable conductor has a volume of the low melting point metal larger than a volume of the high melting point metal. At least one battery cell,
And a protection element connected to the charge / discharge path of the battery cell and blocking the charge / discharge path,
The protection device includes:
A first insulating substrate;
And an available conductor mounted on a surface of the first insulating substrate and serving as the charging / discharging path,
And a suction hole for sucking the melted solder is opened on the surface of the first insulating substrate. First and second external electrodes,
An available conductor connected between the first and second external electrodes,
A suction member connected to the usable conductor and sucking the fused solder,
The suction member
A first insulating substrate disposed between the first and second external electrodes,
A surface electrode formed on a surface of the first insulating substrate and connected to a part of the usable conductor;
A heating element formed on the first insulating substrate,
And a through hole formed in the thickness direction of the first insulating substrate and continuous with the surface electrode,
And shields a current path between the first external electrode and the second external electrode by melting the usable conductor. 30. The method of claim 29,
Wherein the through hole has a conductive layer continuous with the surface electrode on an inner peripheral surface thereof. 31. The method of claim 30,
And a back electrode formed on a back surface of the first insulating substrate,
Wherein the through hole is formed in the thickness direction of the first insulating substrate between the surface electrode and the back electrode, and the conductive layer is continuous with the surface electrode and the back electrode. 32. The method of claim 31,
Wherein the heating element is formed on a surface side of the first insulating substrate and is electrically connected to the surface electrode. 32. The method of claim 31,
Wherein the heating element is formed on a back surface side of the first insulating substrate and is electrically connected to the back electrode. 32. The method of claim 31,
Wherein the heating element is formed inside the first insulating substrate and is electrically connected to the surface electrode or the back electrode. 35. The method according to any one of claims 29 to 34,
And the pre-solder and / or flux is filled in part or the whole of the through-hole. 35. The method according to any one of claims 32 to 34,
Wherein one of the front surface side and the back surface side of the first insulating substrate has a temperature gradient higher than the other temperature when the heating element generates heat. 36. The method of claim 35,
Wherein one of the front surface side and the back surface side of the first insulating substrate has a temperature gradient higher than the other temperature when the heating element generates heat. 35. The method according to any one of claims 29 to 34,
Wherein the heating element is disposed on both sides of the through hole. 39. The method of claim 38,
A plurality of through holes are formed,
Wherein the heating element is disposed on both sides of the plurality of through holes. 35. The method according to any one of claims 29 to 34,
A second insulating substrate,
A heating element which is formed on the second insulating substrate and melts the usable conductor,
And a flocculating member connected to the usable conductor and having a collector electrode for flocculating the molten conductor in which the usable conductor melts. 41. The method of claim 40,
Wherein the aggregating member is connected to a surface of the usable conductor opposite to the surface to which the suction member is connected. 42. The method of claim 41,
And the aggregating member has the collector electrode facing the through-hole of the suction member. 35. The method according to any one of claims 29 to 34,
And a plurality of said suction members are connected to said usable conductor. 44. The method of claim 43,
And two of said suction members are opposed to each other and connected to said usable conductor. 41. The method of claim 40,
Wherein the permissible conductor is a structure in which the inner layer is a low melting point metal and the outer layer is a coating structure of a high melting point metal. 44. The method of claim 43,
Wherein the permissible conductor is a structure in which the inner layer is a low melting point metal and the outer layer is a coating structure of a high melting point metal. At least one battery cell,
A protection element connected to the charge / discharge path of the battery cell,
And a current control element for detecting a voltage value of the battery cell and controlling energization to the protection element,
The protection device includes:
First and second external electrodes,
An available conductor connected between the first and second external electrodes,
And a suction member for sucking the melted solder,
The suction member
A first insulating substrate disposed between the first and second external electrodes,
A surface electrode formed on a surface of the first insulating substrate and connected to a part of the usable conductor;
A heating element formed on the first insulating substrate,
And a through hole formed in the thickness direction of the first insulating substrate and continuous with the surface electrode,
And shields a current path between the first external electrode and the second external electrode by melting the usable conductor. A first insulating substrate;
First and second external electrodes,
An intermediate electrode formed between the first external electrode and the second external electrode on one surface side of the first insulating substrate,
A heating element formed on the other surface side of the first insulating substrate,
Wherein the first external electrode and the second external electrode are connected to the intermediate electrode on one surface of the first insulating substrate and connected to the first and second external electrodes, An available conductor for fusing a current path between the first and second electrodes,
A heating-element lead-out electrode formed on the other surface side of the first insulating substrate and electrically connected to one terminal of the heating-element,
And a through hole formed in the thickness direction of the first insulating substrate between the intermediate electrode and the heating element withdrawing electrode and having a conductive layer continuous with the intermediate electrode and the heating element withdrawing electrode formed on the inner side thereof. 49. The method of claim 48,
Further, the protection element includes a pre-solder filled in the through-hole. 49. The method of claim 48,
Wherein the first insulating substrate has a temperature gradient higher than that of one surface of the first insulating substrate when the heat generating element generates heat. 49. The method of claim 48,
Wherein the heat generating element is formed on both sides of the through hole. 52. The method of claim 51,
Wherein the through holes are plural,
Wherein the heat generating element is disposed on both sides of the plurality of through holes. At least one battery cell,
A protection element connected to cut off a current flowing in the battery cell,
And a current control element for detecting a voltage value of each of the battery cells and controlling a current for heating the protection element,
The protection device includes:
A first insulating substrate;
First and second external electrodes,
An intermediate electrode formed between the first external electrode and the second external electrode on one surface side of the first insulating substrate,
A heating element formed on the other surface side of the first insulating substrate,
Wherein the first external electrode and the second external electrode are connected to the intermediate electrode on one surface of the first insulating substrate and connected to the first and second external electrodes, An available conductor for fusing a current path between the first and second electrodes,
A heating-element lead-out electrode formed on the other surface side of the first insulating substrate and electrically connected to one terminal of the heating-element,
And a through hole formed in the thickness direction of the first insulating substrate between the intermediate electrode and the heating element withdrawing electrode and having a conductive layer continuous with the intermediate electrode and the heating element withdrawing electrode formed on the inner side.

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