Self-resetting three-terminal crowbar

Abstract

The application discloses a self-recoverable three-terminal protector, which comprises a substrate, a first electrode, a second electrode and a third electrode arranged on the substrate and separated from each other, a first electric heating part, a second electric heating part, a driving member and a cross rod; the driving member is in an overall arc structure and comprises a first supporting point and a first supporting arm arranged at two ends of the first supporting point; the cross rod comprises a second supporting point and a second supporting arm arranged at two ends of the second supporting point, and a connecting contact for electric connection is arranged on each of the two second supporting arms; the driving member has a first state of arching towards the cross rod and a second state of arching away from the cross rod; and a heat transfer channel is arranged between the driving member and the first electric heating part and the second electric heating part. When a circuit fault occurs, the driving member is actuated to disconnect the circuit, and when the circuit fault is removed, the temperature of the driving member decreases, the state changes again, and the circuit is reconnected to the on state, so that the three-terminal protector can be repeatedly used without replacement.

Description

Technical Field

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

[0002] Three-terminal fuses, which provide both overcurrent and overvoltage protection, are widely used in battery management systems and other fields as critical circuit protection components. Currently, most commonly used three-terminal fuses disconnect the circuit by melting a built-in alloy fuse link under high-temperature conditions. These are disposable electronic products, requiring replacement after troubleshooting. This increases labor and financial costs, while also wasting resources. Summary of the Invention

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

[0004] To achieve the above objectives, the present invention provides a self-recoverable three-terminal fuse, comprising a substrate, on which are provided a first electrode, a second electrode, and a third electrode separated from each other, as well as a first electric heating portion, a second electric heating portion, a driving member, and a crossbar, wherein the driving member is located between the crossbar 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 supporting 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, each of the two second arms is 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 includes a first surface facing away from the crossbar and a second surface facing the crossbar, wherein the first surface and the second surface have 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 around the second fulcrum, so that the two connection contacts are respectively in contact with or separated from the first electrode and the second electrode;

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

[0012] The second electric heating portion 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 connection 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, the 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 portion, the upper and lower ends of the second support member are respectively connected to the first fulcrum and the second electric heating portion, 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 part is electrically connected to the third electrode through a second electrical connector, and the other end of the second electric heating part 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. The driving part uses the different thermal expansion coefficients on the two sides to achieve accurate response to the specific target temperature and realize the state change 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 operates to disconnect the circuit. When the circuit fault is resolved, the temperature of the driving part drops and the state will change again, thereby driving the circuit to re-enter the connected state, so as to realize the reuse of the three-terminal fuse without the need for replacement in the middle. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 for Figure 1 side view.

[0026] Figure 3 2 is a back structure diagram of the 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 This is a three-dimensional structural diagram of a three-terminal fuse in a connected state according to another embodiment of the present invention.

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

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

[0033] Figure 10 for Figure 9 Planar structure diagram of the middle drive component.

[0034] Figure 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] Figure 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] Figure 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 embodiments 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 following first describes the working mechanism of the traditional three-terminal fuse.

[0039] like Figure 13 A traditional three-terminal fuse consists of three terminals, two fuses made of alloy metal, and a heating element. The fuses can melt in the event of an overcurrent or short circuit, cutting off the circuit and providing protection. The three terminals are two first terminals for current control and a second terminal for voltage control. The two fuses are connected in series between the two first terminals.

[0040] Taking a battery charge and discharge circuit as an example, when the charging current is too high, the fuse between the two first terminals will directly blow. When the battery is overcharged and the voltage is too high, the controller will send a low level to the second terminal, turning on the circuit where the heating wire is located. The heating wire begins to heat up and blow the fuse, thus achieving overcurrent and overvoltage protection.

[0041] From this we can see 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 provided a first electrode J1, a second electrode J2, a third electrode J3, a first heating element H1, a second heating element H2, a driver 2, and a crossbar 3. The driver 2 is located between the crossbar 3 and the substrate 1.

[0043] The first and second electrodes J1 and J2 are two current control terminals, and the third electrode J3 is a voltage control terminal. That is, the first and second electrodes J1 and 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 has an overall arched structure 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 at both ends of the second fulcrum 30. Each of the two second arms 31 is provided with a connection contact 32 for electrical connection, 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) convex 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 in which the fuse is located is in an abnormal state, the first heating element H1 or the second heating element H2 transfers the generated heat to the driver 2, causing the temperature of the driver 2 to rise 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 support point 20 of the driver 2 arches from toward the crossbar 3 to away from the crossbar 3, thereby driving the two second support arms 31 to move away from the substrate 1, causing the connection contacts 32 on the two first support arms 21 to separate from the corresponding first electrode J1 and second electrode J2, thereby disconnecting 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 driving part 2 returns to a normal level, causing the temperature of the driving part 2 to drop. When the temperature of the driving part 2 drops to room temperature, the state of the driving part 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, as well as 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 driver 2 is an elongated structure with a slow temperature response. As the temperature rises, the two first arms 21 of the driver 2 slowly tilt toward the crossbar 3 until they push up the two second arms 31. In other words, the driver 2 slowly changes from the first state to the second state.

[0055] like Figures 7 to 10 The driver 2 has a round pot-shaped structure and exhibits a fast temperature response. Before the temperature reaches a critical temperature point, the driver 2 remains in a stable state. When the temperature reaches a critical temperature point, the driver 2 changes state from the first state to the second state.

[0056] In this regard, a driving element 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, see again Figures 1 to 6The crossbar 3 is a resilient conductive metal sheet. The two second arms 31 elastically deform relative to the second fulcrum 30, driving the connection contacts 32 toward or away from the first electrode J1 and the second electrode J2. The two connection contacts 32 are electrically connected via the crossbar 3, eliminating the need for a separate wiring harness for the two connection contacts 32.

[0059] On the other hand, the crossbar 3 can generate heat due to its own resistance when current flows between the two connection contacts 32, so that the crossbar 3 functions as the first electric heating element H1. In this embodiment, the crossbar 3 itself serves as the electrical connection channel between the two connection contacts 32. At the same time, since the crossbar 3 has its own resistance, it will generate heat when current flows. Therefore, using the crossbar 3 as the first electric heating element H1 can further streamline the overall structure of the fuse.

[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 are electrically and thermally conductive. The first support member 4 and the second support member 5 are located in the conductive path of the second heating element H2. When the third electrode J3 is connected, the current applied to the second heating element 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 arrangement of the first support member 4 and the second support member 5 provides space for the two first arms 21 of the driver 2 to change state. Furthermore, because the first support member 4, the second support member 5, and the driver 2 are electrically and thermally conductive, heat generated by the crossbar 3 is transferred to the driver 2 via the first support member 4, and heat generated by the second heating element H2 is transferred to the driver 2 via the second support member 5. When the third electrode J3 is conductive, the current between the two connection contacts 32 flows through the first support member 4, the second support member 5, and the second heating element 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 provided between the second electric heating part H2 and the substrate 1, and a second insulating isolation plate 71 is provided 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, to facilitate connecting the fuse to the circuit, the first electrode J1, the second electrode J2, and the third electrode J3 each 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. Each pair of the first electrode sheet P1 and the second electrode sheet P2 is electrically connected via a third electrode sheet P3 that penetrates the upper and lower surfaces 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, respectively, on the upper and lower surfaces of the substrate 1. The first electrode sheet P1 is used to electrically connect various parts within the fuse, and the second electrode sheet P2 is used to electrically connect to the three ports of the circuit in which the fuse is located.

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

[0069] like Figure 11 In this charge and discharge management circuit, the fuse serves as a component 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 is working 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 connection 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 safe value, the temperature of the crossbar 3 rises 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, causing the first support point 20 to change 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 (as shown in FIG. Figure 6 ), then the connection between port K1 and port K2 in the charge and discharge management circuit is disconnected, such as Figure 12 , thereby disconnecting 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, causing the first support point 20 to arch toward the crossbar 3 instead of arching away from the crossbar 3. The two second support arms 31 return to their original position under the action of the elastic restoring force, so that the two connection contacts 32 re-contact the first electrode J1 and the second electrode J2 respectively, thereby connecting ports 1 and 2 in the circuit and restarting the circuit.

[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 support 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 electric connector 61, the third electrode J3, and then flows out from port K3. Then the second electric heating part H2 is energized and heated, and the generated heat is transferred to the driver 2, causing the temperature of the driver 2 to rise. When the temperature of the driver 2 rises to the second target temperature, the state changes, causing the first fulcrum 20 to change 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 Figure 12 ), thereby disconnecting the circuit and protecting the circuit and terminal equipment. When the circuit fault is eliminated, the state of the driver 2 changes again, causing the first support point 20 to arch toward the crossbar 3 instead of bending away from the crossbar 3. The two second support arms 31 return to their original position under the action of the elastic restoring force, so that the two connection contacts 32 re-contact the first electrode J1 and the second electrode J2, respectively. This connects the ports K1 and 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 driver 2 will also change, thereby disconnecting the circuit, preventing the circuit from operating in abnormal ambient temperatures and effectively ensuring the safety of the circuit. When the ambient temperature drops back to the normal operating range, driver 2 will operate again, restarting 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 connected 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 surfaces are different, the side with a larger thermal expansion coefficient is the active layer, and the other side is the passive layer.

[0077] The active layer is made of Mn-Ni-Cu alloy with the following chemical composition:

[0078] Mn: 70-74%

[0079] Ni: 9-11%

[0080] Cu: remainder.

[0081] The active layer material can also be a Ni-Cr-Fe alloy with the following chemical composition:

[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 with the following chemical composition:

[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 crossbar 3 is made of Cu-Zr alloy with the following chemical composition:

[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 the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A self-recoverable three-terminal fuse, characterized in that: The device comprises a substrate on which are provided a first electrode, a second electrode, a third electrode, a first electric heating portion, a second electric heating portion, a driving member and a crossbar, the driving member being located between the crossbar 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 supporting 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, each of the two second arms is 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 includes a first surface facing away from the crossbar and a second surface facing the crossbar, wherein the first surface and the second surface have 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 around the second fulcrum, so that the two connection contacts are respectively in contact with or separated from the first electrode and the second electrode; The first electric heating unit is capable of generating heat based on the current between the two connection contacts; The second electric heating portion 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; a first support member is provided between the cross bar and the driving member, and a second support member is provided between the driving member and the second electric heating part, and the first support member, the second support member and the driving member have conductive and thermal conductive properties; 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 part is electrically connected to the third electrode through a second electrical connector, and the other end of the second electric heating part is electrically connected to the transfer electrode through a third electrical connector; 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 support member.

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 connection 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: The upper and lower ends of the first support member are connected to the second support point and the first support point respectively, 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: The upper and lower ends of the second support member are respectively connected to the first support point and the second electric heating part, and 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 and the second support member are located in the conductive path of the second electric heating part.

7. 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 are electrically connected through a third electrode sheet that passes through the upper and lower surfaces of the substrate.

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

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