Self-recovery three-terminal protector

Abstract

The invention discloses a self-recovery three-terminal protector which comprises a substrate, and the substrate is provided with a first electrode, a second electrode, a third electrode, a first electric heating part, a second electric heating part, a driving part and a cross rod, the whole driving piece is of an arch structure and comprises a first fulcrum and first supporting arms located at the two ends of the first fulcrum. The cross rod comprises a second fulcrum and second supporting arms located at the two ends of the second fulcrum, and the two second supporting arms are each provided with a connecting contact used for electric connection; the driving piece has a first state of arching towards the cross rod and a second state of arching back to the cross rod; and heat transfer channels are formed between the driving piece and the first electric heating part as well as the second electric heating part. Based on the protector, when the circuit breaks down, the driving piece acts to disconnect the circuit, and when the circuit breaks down, the temperature of the driving piece is lowered, and the state of the driving piece changes again, so that the driving circuit enters the on state again, and the three-terminal protector is repeatedly used and does not need to be replaced in the process.

Description

Technical Field

[0001] The invention relates to the technical field of electronic protection devices, in particular to a self-recoverable three-terminal fuse. Background Art

[0002] The three-terminal fuse has both overcurrent and overvoltage protection functions and is widely used in many fields such as battery management systems. It is an important circuit protection component. The three-terminal fuses commonly used at present mostly cut off the circuit by melting the built-in alloy fuse under high temperature conditions. They are disposable electronic products. After the circuit fault is eliminated, a new fuse needs to be replaced, which increases additional manual operations and economic costs, and also causes waste of resources. Summary of the invention

[0003] The purpose of the present invention is to provide a self-recoverable three-terminal fuse which can be reused multiple times.

[0004] In order to achieve the above-mentioned object, the present invention provides a self-recoverable three-terminal fuse, which includes a substrate, on which a first electrode, a second electrode, a third electrode, a first electric heating part, a second electric heating part, a driving member and a cross bar are provided, and the driving member is located between the cross bar and the substrate;

[0005] The first electrode and the second electrode are two current control terminals, and the third electrode is a voltage control terminal;

[0006] The driving member is an overall arched structure, comprising a first fulcrum and first arms located at both ends of the first fulcrum;

[0007] The crossbar includes a second fulcrum and second arms located at both ends of the second fulcrum, and the two second arms are respectively provided with a connection contact for electrical connection, and the two connection contacts are electrically connected;

[0008] The cross bar is connected to the driving member via the second fulcrum;

[0009] The driving member comprises a first surface facing away from the crossbar and a second surface facing the crossbar, the first surface and the second surface having different thermal expansion coefficients, so that at a first target temperature, the driving member has a first state arched toward the crossbar, and at a second target temperature, the driving member has a second state arched away from the crossbar;

[0010] By means of the change of the driving member between the first state and the second state, the two first arms can drive the two second arms of the crossbar to move up and down with the second fulcrum as the center, so that the two connecting contacts are respectively in contact with or separated from the first electrode and the second electrode;

[0011] The first electric heating part is capable of generating heat based on the current between the two connecting contacts;

[0012] The second electric heating part has one end electrically connected to the third electrode and the other end electrically connected to any one of the connection contacts;

[0013] A heat transfer channel is provided between the driving member and the first electric heating part and the second electric heating part.

[0014] Preferably, the crossbar is a conductive metal sheet with elasticity, and the two connection contacts are electrically connected by means of the crossbar.

[0015] Preferably, the crossbar can generate heat due to its own resistance under the action of the current between the two connecting contacts, so that the crossbar serves as the first electric heating part.

[0016] Preferably, a first support member is provided between the cross bar and the driving member, upper and lower ends of the first support member are respectively connected to the second fulcrum and the first fulcrum, and the first support member is used to support and fix the cross bar.

[0017] Preferably, a second support member is provided between the driving member and the second electric heating part, the upper and lower ends of the second support member are respectively connected to the first fulcrum and the second electric heating part, and the second support member is used to support and fix the driving member.

[0018] Preferably, the first support member, the second support member and the driving member have electrical and thermal conductivity, and the first support member and the second support member are located in a conductive path of the second electric heating part.

[0019] Preferably, a transfer electrode is also provided on the substrate, and the second support member is electrically connected to the transfer electrode through a first electrical connector; one end of the second electric heating portion is electrically connected to the third electrode through a second electrical connector, and the other end of the second electric heating portion is electrically connected to the transfer electrode through a third electrical connector.

[0020] Preferably, a first insulating isolation plate is provided between the second electric heating part and the substrate, and a second insulating isolation plate is provided between the second electric heating part and the second supporting member.

[0021] Preferably, the first electrode, the second electrode and the third electrode each include a first electrode sheet arranged on the upper surface of the substrate and a second electrode sheet arranged on the lower surface of the substrate, and each pair of the first electrode sheet and the second electrode sheet are electrically connected through a third electrode sheet that passes through the upper and lower surfaces of the substrate.

[0022] Preferably, the two connecting contacts are spherical structures.

[0023] Compared with the prior art, the three-terminal fuse provided by the above technical solution of the present invention mainly includes a first electric heating part, a second electric heating part, a driving part and a cross bar, wherein the first electric heating part and the second electric heating part can generate heat based on the current state of the circuit and transfer the heat to the driving part, and the driving part utilizes the different thermal expansion coefficients on the two sides to achieve accurate response to a specific target temperature and achieve state changes at a specific temperature, thereby driving the two ends of the cross bar to move up and down, thereby disconnecting or connecting the circuit; it can be seen that for the above-mentioned fuse, when a circuit fails, the first electric heating part or the second electric heating part transfers the excessive heat to the driving part, and the driving part is actuated to disconnect the circuit, and when the circuit fault is resolved, the temperature of the driving part drops and the state changes again, thereby driving the circuit to re-enter the connected state, thereby realizing the reuse of the three-terminal fuse without the need for replacement in between. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural diagram of a three-terminal fuse in one embodiment of the present invention in a connected state.

[0025] Figure 2 for Figure 1 Side view of.

[0026] Figure 3 FIG. 4 is a back structure diagram of a substrate in an embodiment of the present invention.

[0027] Figure 4 3D is a three-dimensional structural diagram of a substrate in an embodiment of the present invention.

[0028] Figure 5 for Figure 1 Exploded view of the three-terminal fuse.

[0029] Figure 6 for Figure 1 Side view of the three-terminal fuse in the disconnected state.

[0030] Figure 7 It is a three-dimensional structural diagram of a three-terminal fuse in another embodiment of the present invention in a connected state.

[0031] Figure 8 for Figure 7 A three-dimensional structural diagram of the three-terminal fuse in the disconnected state.

[0032] Fig. 9 for Figure 7 Three-dimensional structural diagram of the middle drive component.

[0033] Fig.10 for Fig. 9 Planar structural diagram of the middle drive component.

[0034] Fig.11 1 is a circuit connection diagram of a three-terminal fuse in an embodiment of the present invention, wherein the three-terminal fuse is in a connected state.

[0035] Fig.12 1 is a circuit connection diagram of a three-terminal fuse in an embodiment of the present invention, wherein the three-terminal fuse is in a disconnected state.

[0036] Fig.13 It is a structural diagram of a three-terminal fuse in the prior art. DETAILED DESCRIPTION

[0037] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0038] This embodiment discloses a three-terminal fuse for circuit protection, which is particularly suitable for battery management circuits. Compared with traditional three-terminal fuses, the three-terminal fuse in this embodiment has a self-recovery function. To facilitate understanding of the characteristics of the three-terminal fuse in this embodiment, the working mechanism of the traditional three-terminal fuse is first described below.

[0039] like Fig.13 The traditional three-terminal fuse includes three terminals, two fuses made of alloy metal and a heating wire. The fuse can be melted in the event of overcurrent or short circuit fault, cutting off the circuit to protect it. The three terminals are two first terminals for current control and one second terminal for voltage control. The two fuses are connected in series between the two first terminals.

[0040] Taking the battery charging and discharging circuit as an example, when the charging current is too large, the fuse between the two first terminals will blow directly. After overcharging, the voltage is too high, and the controller will give a low level to the second terminal, then the circuit where the heating wire is located will be turned on, and the heating wire will start to heat up and blow the fuse. Thus, overcurrent and overvoltage protection is achieved.

[0041] It can be seen that when the fuse is triggered, the fuse is blown. After the fault is eliminated, a new fuse needs to be replaced.

[0042] In this regard, in order to make the three-terminal fuse have a self-recovery function, that is, after the fault is eliminated, the fuse can automatically recover without replacing a new fuse, such as Figures 1 to 6 The three-terminal fuse in this embodiment includes a substrate 1, on which are disposed a first electrode J1, a second electrode J2, a third electrode J3, a first electric heating portion H1, a second electric heating portion H2, a driving member 2 and a crossbar 3, which are separated from each other. The driving member 2 is located between the crossbar 3 and the substrate 1.

[0043] The first electrode J1 and the second electrode J2 are two current control terminals, and the third electrode J3 is a voltage control terminal. That is, the first electrode J1 and the second electrode J2 are connected to the current path of the protected circuit, and the third electrode J3 triggers the voltage protection function based on the target voltage signal of the protected circuit.

[0044] The driving member 2 is a power member that changes state based on a specific temperature. The driving member 2 is an arched structure as a whole, and includes a first fulcrum 20 and first arms 21 located at both ends of the first fulcrum 20 .

[0045] The crossbar 3 includes a second fulcrum 30 and second arms 31 located at both ends of the second fulcrum 30. A connection contact 32 for electrical connection is respectively provided on the two second arms 31, and the two connection contacts 32 are electrically connected. In this embodiment, the two connection contacts 32 are preferably spherical structures.

[0046] The driving member 2 includes a first surface 22 facing away from the crossbar 3 and a second surface 23 facing the crossbar 3. The thermal expansion coefficients of the first surface 22 and the second surface 23 are different, so that at the first target temperature, the driving member 2 has a first state (such as a first state) protruding toward the crossbar 3. Figure 2 ), at the second target temperature, the driving member 2 has a second state (such as Figure 6 ).

[0047] By means of the change of the driving member 2 between the first state and the second state, the two first arms 21 can drive the two second arms 31 of the crossbar 3 to move up and down around the second fulcrum 30, so that the two connecting contacts 32 are respectively in contact with or separated from the first electrode J1 and the second electrode J2.

[0048] The first electric heating unit H1 can generate heat based on the current between the two connection contacts 32 .

[0049] One end of the second electric heating portion H2 is electrically connected to the third electrode J3 , and the other end is electrically connected to any connection contact 32 .

[0050] A heat transfer channel is provided between the driving member and the first electric heating part H1 and the second electric heating part H2.

[0051] In this embodiment, the first target temperature is room temperature, and the second target temperature is a warning temperature higher than room temperature. When the circuit where the fuse is located is in an abnormal state, the first electric heating part H1 or the second electric heating part H2 transfers the generated heat to the driver 2, so that the temperature of the driver 2 rises above room temperature. When the temperature of the driver 2 reaches the warning temperature, due to the different thermal expansion coefficients of the two sides of the driver 2, the first fulcrum 20 of the driver 2 changes from arching toward the cross bar 3 to arching away from the cross bar 3, thereby driving the two second arms 31 to move away from the substrate 1, so that the connection contacts 32 on the two first arms 21 are separated from the corresponding first electrodes J1 and second electrodes J2 to disconnect the circuit.

[0052] When the circuit fault is eliminated, the heat transferred by the first electric heating part H1 and the second electric heating part H2 to the driver 2 returns to a normal level, causing the temperature of the driver 2 to drop. When the temperature of the driver 2 drops to room temperature, the state of the driver 2 changes again. At this time, the two second arms 31 of the cross bar 3 are reset, so that the two connecting contacts 32 are respectively in contact with the first electrode J1 and the second electrode J2, so that the circuit is connected again.

[0053] It is worth noting that by controlling the ratio of the length to the width, and the thickness of the driving member 2 , the driving member 2 can have a slow response effect and a fast response effect to temperature.

[0054] like Figure 1 and Figure 2 The driving member 2 is in a long strip structure and has a slow response effect to temperature. As the temperature rises, the two first arms 21 of the driving member 2 slowly tilt toward the crossbar 3 until the two second arms 31 are lifted up, that is, the driving member 2 slowly changes from the first state to the second state.

[0055] like Figures 7 to 10 The driving member 2 is a round pot-shaped structure, which has a fast response effect to temperature. Before the temperature rises to a near temperature point, the state of the driving member 2 will not change. When the temperature of the driving member 2 rises to a critical temperature point, the state of the driving member 2 jumps, that is, jumps from the first state to the second state.

[0056] In this regard, a driving member 2 with a slow response effect or a fast response effect can be selected according to the requirements of the usage scenario.

[0057] The following description will be made by taking the driving member 2 with a slow response structure as an example.

[0058] On the other hand, please refer again to Figures 1 to 6The crossbar 3 is a conductive metal sheet with elastic force. The two second arms 31 drive the connection contacts 32 to move closer to or away from the first electrode J1 and the second electrode J2 by ​​elastic deformation relative to the second fulcrum 30. The two connection contacts 32 are electrically connected by means of the crossbar 3, so there is no need to configure an additional connection harness for the two connection contacts 32.

[0059] On the other hand, the crossbar 3 can generate heat under the action of the current between the two connection contacts 32 based on its own resistance, so that the crossbar 3 is used as the first electric heating part H1. In this embodiment, the crossbar 3 itself serves as an electrical connection channel between the two connection contacts 32. At the same time, since the crossbar 3 itself has resistance, it will generate heat under the action of the current. Therefore, the crossbar 3 is also used as the first electric heating part H1, which can make the overall structure of the fuse more streamlined.

[0060] On the other hand, a first support member 4 is provided between the crossbar 3 and the driving member 2 , and a second support member 5 is provided between the driving member 2 and the second electric heating part H2 .

[0061] The upper and lower ends of the first support member 4 are connected to the second fulcrum 30 and the first fulcrum 20 respectively, and the upper and lower ends of the second support member 5 are connected to the first fulcrum 20 and the second electric heating part H2 respectively.

[0062] The first support member 4 is used to support the fixed cross bar 3 , and the second support member 5 is used to support the fixed driving member 2 .

[0063] The first support member 4, the second support member 5 and the driving member 2 have electrical and thermal conductivity, and the first support member 4 and the second support member 5 are located in the conductive path of the second electric heating part H2. When the third electrode J3 is turned on, the current loaded on the second electric heating part H2 flows through the second arm 31, the second fulcrum 31, the first support member 4, the first fulcrum 20, the second support member 5, and the third electrode J3.

[0064] In this embodiment, the first support member 4 and the second support member 5 are provided to provide a state change movement space for the two first arms 21 of the driver 2. In addition, since the first support member 4, the second support member 5 and the driver 2 have electrical and thermal conductivity, the heat generated by the crossbar 3 is transferred to the driver 2 via the first support member 4, and the heat generated by the second electric heating part H2 is transferred to the driver 2 via the second support member 5. When the third electrode J3 is turned on, the current between the two connection contacts 32 flows through the first support member 4, the second support member 5 and the second electric heating part H2.

[0065] On the other hand, in order to facilitate the electrical connection between the second support member 5 and the third electrode J3, a transfer electrode J4 is also provided on the substrate 1. The second support member 5 is electrically connected to the transfer electrode J4 through the first electrical connector 60, one end of the second electric heating part H2 is electrically connected to the third electrode J3 through the second electrical connector 61, and the other end of the second electric heating part H2 is electrically connected to the transfer electrode J4 through the third electrical connector 62.

[0066] In order to effectively ensure the working stability of the second electric heating part H2, a first insulating isolation plate 70 is arranged between the second electric heating part H2 and the substrate 1, and a second insulating isolation plate 71 is arranged between the second electric heating part H2 and the second support member 5 to avoid electrical signal interference between the second electric heating part H2 and the substrate 1 and the second support member 5.

[0067] On the other hand, in order to facilitate the connection of the fuse to the circuit, the first electrode J1, the second electrode J2 and the third electrode J3 all include a first electrode sheet P1 disposed on the upper surface of the substrate 1 and a second electrode sheet P2 disposed on the lower surface of the substrate 1, and each pair of the first electrode sheet P1 and the second electrode sheet P2 is electrically connected through the third electrode sheet P3 that penetrates the upper surface and the lower surface of the substrate 1. In this embodiment, each electrode (the first electrode J1, the second electrode J2 and the third electrode J3) is configured as a pair of the first electrode sheet P1 and the second electrode sheet P2 on the upper surface and the lower surface of the substrate 1, respectively, the first electrode sheet P1 is used for the electrical connection of various parts inside the fuse, and the second electrode sheet P2 is used for the electrical connection with the three ports of the circuit where the fuse is located.

[0068] The above embodiment describes in detail the structural principle of the three-terminal fuse in the present invention. The working process of the fuse with the above structure is described in detail below using a circuit for managing the charging and discharging of a pair of batteries.

[0069] like Fig.11 In the charge and discharge management circuit, the fuse is used as a device of the secondary protection circuit. The first electrode J1 and the second electrode J2 of the fuse are respectively connected to the two ports K1 and K2 in the power loop of the charge and discharge management circuit, and the third electrode J3 is connected to the voltage control port K3 on the charge and discharge management circuit.

[0070] When the charge and discharge management circuit works normally, taking charging as an example, the driving member 2 on the fuse is in the first state, such as Figure 2 , so that the two connecting contacts 32 on the second arm 31 are in contact with the first electrode J1 and the second electrode J2 respectively, and the charging current flows into the port K1 and flows out of the port K2. At this time, the circuit between the port K1 and the port K3 is not conductive.

[0071] When the charging current increases sharply and exceeds the safety value, the temperature of the crossbar 3 increases significantly under the action of the large current. The heat of the crossbar 3 is transferred to the driver 2 through the first support member 4. After the temperature of the driver 2 rises to the second target temperature, the state changes, so that the first fulcrum 20 changes from arching toward the crossbar 3 to arching away from the crossbar 3, then the two first arms 21 tilt toward the crossbar 3, thereby lifting the two second arms 31, so that the two connection contacts 32 are separated from the first electrode J1 and the second electrode J2 (such as Figure 6 ), then the connection between port K1 and port K2 in the charge and discharge management circuit is disconnected, such as Fig.12 , thereby cutting off the circuit and protecting the circuit and terminal equipment. When the circuit fault is eliminated and the temperature on the driver 2 drops to the first target temperature, the driver 2 changes state again, so that the first fulcrum 20 changes from arching away from the crossbar 3 to arching toward the crossbar 3, and the two second arms 31 are reset under the action of the elastic restoring force, so that the two connection contacts 32 are respectively re-contacted with the first electrode J1 and the second electrode J2, thereby connecting the port 1 and the port 2 in the circuit, and the circuit is restarted.

[0072] When the voltage detected by the overvoltage detection circuit in the charge and discharge management circuit suddenly increases and exceeds the safety value, the control switch connected to port K3 is turned on, so that the circuit between port K1 and port K3 is turned on, and the current flows into port K1, and then passes through the connecting contact 32, the second arm 31, the second fulcrum 30, the first support member 4, the first fulcrum 20, the second support member 5, the first electrical connector 60, the transfer electrode J4, the third electrical connector 62, the second electric heating part H2, the second electrical connector 61, the third electrode J3, and then flows out of port K3. Then the second electric heating part H2 is energized and heated, and the generated heat is transferred to the driver 2, so that the temperature of the driver 2 increases. When the temperature of the driver 2 increases to the second target temperature, the state changes, so that the first fulcrum 20 changes from arching toward the cross bar 3 to arching away from the cross bar 3, thereby lifting the two second arms 31 (such as Figure 6 ), so that the two connection contacts 32 are separated from the first electrode J1 and the second electrode J2, then the connection between the port K1 and the port K2 in the charge and discharge management circuit is disconnected (such as Fig.12 ), thereby cutting off the circuit and protecting the circuit and the terminal device. When the circuit fault is eliminated, the state of the driving member 2 changes again, so that the first fulcrum 20 changes from bending away from the crossbar 3 to arching toward the crossbar 3, and the two second arms 31 are reset under the action of the elastic restoring force, so that the two connecting contacts 32 are respectively re-contacted with the first electrode J1 and the second electrode J2, thereby connecting the port K1 and the port K2 in the circuit, and the circuit is restarted.

[0073] It should also be noted that when the ambient temperature rises abnormally, the state of the driver 2 will also change, thereby cutting off the circuit and preventing the circuit from operating under abnormal ambient temperature, which can effectively ensure the safety performance of the circuit. When the ambient temperature drops to the normal working range, the driver 2 will act again and restart the circuit.

[0074] It can be seen from this that for the above-mentioned fuse, when a circuit fault occurs, the first electric heating part H1 or the second electric heating part H2 transfers the excessive heat to the driver 2, and the driver 2 operates to disconnect the circuit. When the circuit fault is eliminated, the temperature of the driver 2 drops and the state is reset, so that the drive circuit re-enters the on state, thereby realizing the reuse of the three-terminal fuse without the need for replacement in the middle.

[0075] On the other hand, the overall thickness of the driving member 2 may be between 100 μm and 200 μm, for example, preferably 120 μm or 150 μm.

[0076] On the other hand, for the driving member 2, the principle of its state change is that the thermal expansion coefficients of the two opposite sides are different, the side with a larger thermal expansion coefficient is the active layer, and the other side is the passive layer.

[0077] The material of the active layer is Mn-Ni-Cu alloy, and the chemical composition is as follows:

[0078] Mn: 70~74%

[0079] Ni: 9-11%

[0080] Cu: remainder.

[0081] The active layer material can also be a Ni-Cr-Fe alloy, and the chemical composition is as follows:

[0082] Ni: 20-24%

[0083] Cr: 1~5%

[0084] Fe: balance.

[0085] The material of the active layer can also be a Cu-Zn alloy, and the chemical composition is as follows:

[0086] Zn: 32~50%

[0087] Cu: remainder.

[0088] Furthermore, for the crossbar 3, the overall thickness may be between 100 μm and 200 μm, for example, preferably 120 μm, 150 μm or 200 μm.

[0089] The material of the crossbar 3 is a Cu-Zr alloy, and the chemical composition is as follows:

[0090] Zr: 0.05~0.60%

[0091] Cu: remainder.

[0092] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A self-recoverable three-terminal fuse, characterized in that: The invention comprises a substrate, on which are arranged a first electrode, a second electrode, a third electrode, a first electric heating part, a second electric heating part, a driving member and a cross bar, respectively, wherein the driving member is located between the cross bar and the substrate; The first electrode and the second electrode are two current control terminals, and the third electrode is a voltage control terminal; The driving member is an overall arched structure, comprising a first fulcrum and first arms located at both ends of the first fulcrum; The crossbar includes a second fulcrum and second arms located at both ends of the second fulcrum, and the two second arms are respectively provided with a connection contact for electrical connection, and the two connection contacts are electrically connected; The cross bar is connected to the driving member via the second fulcrum; The driving member comprises a first surface facing away from the crossbar and a second surface facing the crossbar, the first surface and the second surface having different thermal expansion coefficients, so that at a first target temperature, the driving member has a first state arched toward the crossbar, and at a second target temperature, the driving member has a second state arched away from the crossbar; By means of the change of the driving member between the first state and the second state, the two first arms can drive the two second arms of the crossbar to move up and down with the second fulcrum as the center, so that the two connecting contacts are respectively in contact with or separated from the first electrode and the second electrode; The first electric heating part is capable of generating heat based on the current between the two connecting contacts; The second electric heating part has one end electrically connected to the third electrode and the other end electrically connected to any one of the connection contacts; A heat transfer channel is provided between the driving member and the first electric heating part and the second electric heating part.

2. The self-recoverable three-terminal fuse according to claim 1, characterized in that: The crossbar is a conductive metal sheet with elasticity, and the two connection contacts are electrically connected by means of the crossbar.

3. The self-recoverable three-terminal fuse according to claim 2, characterized in that: The crossbar can generate heat due to its own resistance under the action of the current between the two connecting contacts, so that the crossbar serves as the first electric heating part.

4. The self-recoverable three-terminal fuse according to claim 3, characterized in that: A first support member is provided between the cross bar and the driving member, and upper and lower ends of the first support member are respectively connected to the second fulcrum and the first fulcrum, and the first support member is used to support and fix the cross bar.

5. The self-recoverable three-terminal fuse according to claim 4, characterized in that: A second support member is provided between the driving member and the second electric heating part. The upper and lower ends of the second support member are respectively connected to the first fulcrum and the second electric heating part. The second support member is used to support and fix the driving member.

6. The self-recoverable three-terminal fuse according to claim 5, characterized in that: The first support member, the second support member and the driving member have electrical and thermal conductivity, and the first support member and the second support member are located in a conductive path of the second electric heating part.

7. The self-recoverable three-terminal fuse according to claim 6, characterized in that: A transfer electrode is also provided on the substrate, and the second support member is electrically connected to the transfer electrode through a first electrical connector; one end of the second electric heating portion is electrically connected to the third electrode through a second electrical connector, and the other end of the second electric heating portion is electrically connected to the transfer electrode through a third electrical connector.

8. The self-recoverable three-terminal fuse according to claim 6, characterized in that: A first insulating isolation plate is disposed between the second electric heating part and the substrate, and a second insulating isolation plate is disposed between the second electric heating part and the second supporting member.

9. The self-recoverable three-terminal fuse according to claim 1, characterized in that: The first electrode, the second electrode and the third electrode each include a first electrode sheet arranged on the upper surface of the substrate and a second electrode sheet arranged on the lower surface of the substrate, and each pair of the first electrode sheet and the second electrode sheet is electrically connected through a third electrode sheet that passes through the upper and lower surfaces of the substrate.

10. The self-recoverable three-terminal fuse according to claim 1, characterized in that: The two connecting contacts are spherical structures.

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