A high contact reliability energized closer

Abstract

A high-reliability excitation closure device includes a first housing, a second housing disposed within the first housing, an excitation source, a piston, and an insulated first conductor and a second conductor. The first and second conductors are respectively disposed between the contact surfaces of the first and second housings, with one end located outside the housing and the other end insulated and non-contactly disposed on the second housing located within the first housing. The excitation source receives an excitation signal and drives the piston to make the first and second conductors within the first housing make conductive contact. This excitation closure device can quickly connect the grounding branch to release residual energy in the energy storage components of the main circuit after a fault current in the battery pack's main circuit is cut off, ensuring safe subsequent operation. The second housing is disposed within the first housing, making the housing structure more compact and smaller in size.

Description

Technical Field

[0001] This invention relates to the fields of power control and electric vehicles, and in particular to the energy release protection of energy storage components after the main circuit of an electrical fault is cut off. Background Technology

[0002] In addition to traditional thermal fuses, electric vehicle battery pack main circuit protection devices have developed a structure for quick-cutting opening (i.e., excitation device) and are gradually expanding their application range. This device can quickly realize the normally closed to normally open function of the electric switch, overcoming the shortcomings of traditional fuses. It has advantages such as low power consumption (low heat generation), small size and weight, good resistance to current surges, and fast breaking time.

[0003] The main circuit of the battery pack connects numerous electrical components, including inductors, capacitors, and motors. When a fault current occurs in the main circuit, the fault current can be cut off by a thermal fuse or an excitation device, disconnecting the battery pack from the main circuit. However, the inductors, capacitors, motors, and other components in the external circuit of the battery pack also store a certain amount of electrical energy that has not yet been released, posing a safety hazard to personnel during subsequent operation and maintenance.

[0004] Currently, there is no corresponding protection device for the rapid release of residual electrical energy in the energy storage component after the main circuit of the electric vehicle battery pack is cut off. The safety hazard of residual electrical energy cannot be ignored. Based on this need, an excitation closure device has been invented, which can quickly realize the function of normally open to normally closed circuit.

[0005] The excitation closure is connected to the grounding branch on the main circuit of the electric vehicle, forming a parallel connection with the battery pack. When the battery pack is working normally, this grounding branch is in a normally open state. When a fault current occurs in the main circuit and it is disconnected, the excitation device of the normally open switching normally closed circuit of the present invention immediately activates, quickly connects the grounding branch, and releases the electrical energy of the energy storage components in the main circuit to ensure the safety of subsequent operations. Summary of the Invention

[0006] The purpose of this invention is to provide an excitation closure with high contact reliability. By driving a piston through an excitation source, the first conductor and the second conductor make conductive contact. In conjunction with an excitation fuse, the electrical energy of the load in the circuit can be released. The nested arrangement of the first and second housings makes the housing structure more compact and smaller in size.

[0007] To achieve the above objectives, the high-contact-reliability excitation closure device of the present invention includes a first housing, a second housing disposed within the first housing, an excitation source, a piston, and an insulated first conductor and a second conductor; the first conductor and the second conductor are respectively disposed between the contact surfaces of the first housing and the second housing, with one end located outside the housing and the other end disposed in an insulated, non-contact manner on the second housing located inside the first housing; the excitation source receives an excitation signal and drives the piston to make the first conductor and the second conductor located inside the first housing make conductive contact.

[0008] Preferably, the first conductor and the second conductor each include a pre-contact portion, a connecting portion, and a conductive portion, wherein the connecting portion electrically connects the pre-contact portion and the conductive portion, and the pre-contact portion and the connecting portion are in a bent relationship; the conductive portion is located outside the first housing and the second housing, the connecting portion is located between the contact surfaces of the first housing and the second housing, and the pre-contact portions of the first conductor and the second conductor are located on the second housing in an insulated and non-contact manner; the excitation source receives an excitation signal to drive a piston to make the pre-contact portions of the first conductor and the second conductor located inside the first housing make conductive contact.

[0009] Preferably, the piston is supported within the first housing via a first conductor pre-contact portion.

[0010] Preferably, a limiting structure is provided on the first conductor pre-contact portion and the second housing to restrict the initial position of the first conductor pre-contact portion.

[0011] Preferably, a serrated structure is provided on the pre-contact end face of the first conductor.

[0012] Preferably, an energy-absorbing rib is provided laterally between the second conductor pre-contact portion and the bottom of the second housing, and a gap is maintained between the energy-absorbing rib and the second conductor pre-contact portion; the first conductor pre-contact portion is located between the second conductor pre-contact portion and the piston; the excitation source receives the excitation signal to drive the piston to move, and drives the first conductor pre-contact portion to move and make conductive contact with the second conductor pre-contact portion.

[0013] Preferably, the pre-contact portion of the first conductor is provided with a U- or V-shaped elastic structure, and the pre-contact portion of the second conductor is provided with a notch that can engage the U- or V-shaped elastic structure of the pre-contact portion of the first conductor.

[0014] Preferably, the notch of the second conductor pre-contact portion is formed by elastic bending of less than 90° on both sides of the U or V-shaped elastic structure that engages with it.

[0015] Preferably, the front end of the pre-contact portion of the second conductor is bent to form a limiting portion, which is inserted into the gap between the end of the energy-absorbing rib and the shell wall of the second housing.

[0016] Preferably, the outer side and end face of the second housing located inside the first housing are respectively provided with communicating limiting grooves, and the first conductor and the second conductor are respectively located at the limiting grooves; a positioning structure for positioning the first conductor and the second conductor is provided at the limiting grooves.

[0017] Preferably, the contact area between the first housing and the second housing is provided with a matching mounting boss and a mounting groove.

[0018] Preferably, limiting protrusions are respectively provided inside the first housing to press against the first conductor and the second conductor located on the shell wall of the second housing.

[0019] Preferably, an exhaust port is provided on the end face of the second housing located inside the first housing.

[0020] Preferably, a grid through-hole is provided at the bottom of the second housing.

[0021] The high-reliability excitation closure of this invention can quickly connect the grounding branch to release residual energy in the energy storage components of the main circuit after the fault current in the battery pack main circuit is cut off, thus ensuring the safety of subsequent operations. The second housing of this invention is disposed within the first housing, making the housing structure more compact and smaller in size. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the excitation closure structure under normal conditions in Example 1.

[0023] Figure 2 This is a side view of the excitation closure structure under normal conditions in Example 1.

[0024] Figure 3 In Example 1 Figure 1 A schematic diagram of the structure after the excitation closure is activated.

[0025] Figure 4 In Example 1 Figure 2 A schematic diagram of the structure after the excitation closure is activated.

[0026] Figure 5 This is a schematic diagram of the external structure of the first shell in Embodiment 1.

[0027] Figure 6 This is a schematic diagram of the internal structure of the first shell in Embodiment 1.

[0028] Figure 7 This is a schematic diagram of the second shell structure in Embodiment 1.

[0029] Figure 8 This is a top view of the second shell structure in Embodiment 1.

[0030] Figure 9 This is a bottom view of the second shell structure in Embodiment 1.

[0031] Figure 10 This is a schematic diagram of the first conductor structure in Example 1.

[0032] Figure 11 This is a schematic diagram of the second conductor structure in Example 1.

[0033] Figure 12 This is a schematic diagram of the first conductor, the second conductor, and the second shell structure in Example 1.

[0034] Figure 13 This is a schematic diagram of the excitation closure structure under normal conditions in Example 2.

[0035] Figure 14 This is a side view of the excitation closure structure under normal conditions in Example 2.

[0036] Figure 15 In Example 2 Figure 13 A schematic diagram of the structure after the excitation closure is activated.

[0037] Figure 16 In Example 2 Figure 14 A schematic diagram of the structure after the excitation closure is activated.

[0038] Figure 17 This is a schematic diagram of the first and second conductors in Example 2.

[0039] Figure 18 This is a schematic diagram of the first conductor side view structure in Example 2.

[0040] Figure 19 This is a side view of the second conductor structure in Example 2.

[0041] Figure 20 This is a schematic diagram of the second shell structure in Embodiment 2.

[0042] Figure 21 This is a schematic diagram of the second shell structure in Embodiment 2.

[0043] Figure 22 This is a top view of the second shell structure in Embodiment 2.

[0044] Figure 23 This is a bottom view of the second shell structure in Embodiment 2. Detailed Implementation

[0045] The preferred embodiments of the above technical solutions are described in detail with reference to the figures.

[0046] Example 1

[0047] See Figures 1 to 12The excitation closure device in this example mainly includes an excitation source 1, a first housing 2, a piston 3, a first conductor 4, a second conductor 5, and a second housing 6.

[0048] The first housing 2 is fitted over the second housing 6 to form the excitation closure housing. The first housing and the second housing have corresponding through internal cavities. The excitation source 1, piston 3, first conductor 4, second conductor 5, and second housing 6 are disposed in the inner cavity of the first housing. The first conductor 4 and the second conductor 5 pass through the contact surface between the inner cavities of the first housing and the second housing and are located on opposite sides of the housing. One end of the first conductor 4 and the second conductor 5 is located outside the housing and serves as a connection end to the external circuit. The other end of the first conductor 4 and the second conductor 5 is located in the second housing in an insulated and non-contact position.

[0049] The first housing 2 has a cavity extending through both ends. Within this cavity, a layered structure sequentially houses the excitation source, piston, conductor, and the internal cavity of the second housing 6. Each cavity has a different cross-sectional area. The first housing cavity houses the excitation source 1, piston 3, and second housing 6. The excitation source 1 is located at the top of the first housing cavity. Its fixing method only needs to ensure its secure placement; for example, it can be press-fitted into the first housing, molded into the first housing, or have a pressure plate added to its upper end to engage with the stepped hole in the first housing for positioning. The excitation source is a gas generator that, upon receiving a specified electrical signal, produces high-pressure gas to perform work on the piston, thereby driving the conductive plate.

[0050] Piston 3 is arranged in the inner cavity of the first housing, adjacent to the excitation source. Piston 3 has a concave cross-section. In the initial state, the piston is supported on the first conductor, and the initial position of the piston is defined by the support of the first conductor.

[0051] The first conductor 4 is formed by bending a long strip of sheet-like conductor twice to create a pre-contact portion 401, a conductive portion 402, and a connecting portion 403 perpendicular to both. The pre-contact portion 401 and the conductive portion 402 are parallel to each other and face opposite directions. The pre-contact portion 401 is the part of the first conductor that is pre-designed to contact the second conductor and is located inside the housing. The conductive portion 402 is the part that connects to the external circuit and is located outside the housing. The pre-contact portion 401, the conductive portion 402, and the connecting portion 403 are an integral structure. The first conductor is made of metal and has a certain thickness, rigidity, and mechanical strength.

[0052] The pre-contact portion 401, at its end furthest from the connecting portion, is configured with a serrated structure 404 along its width. On both sides of the serrated structure of the first conductor, hook-shaped protrusions 405 for limiting are also provided in the width direction. These, together with hook-shaped grooves at corresponding positions on the second housing, form a limiting structure to initially position the pre-contact portion of the first conductor, preventing accidental contact between the first and second conductors under normal operating conditions such as vibration and impact. When the first conductor is pushed by the piston to contact the second conductor, the serrated structure of the first conductor scrapes the surface of the pre-contact portion of the second conductor, causing multiple tooth tips to deform under force, increasing the contact area and improving the reliability of the electrical connection. If the surface of the pre-contact portion of the second conductor is oxidized, the serrated structure of the first conductor scrapes away the oxide layer, establishing a reliable electrical connection with the pre-contact portion. When the pre-contact portion of the first conductor is pushed by the piston, the hook-shaped protrusions deform under force and lose their limiting function, causing the pre-contact portion of the first conductor to bend under the action of the piston.

[0053] The second conductor 5 has a similar structure to the first conductor. The second conductor 5 is formed by bending a long strip of plate-shaped conductor three times to form a limiting part 501, a pre-contact part 502, a conductive part 503 and a connecting part 504. The pre-contact part 502 and the conductive part 503 are parallel to each other and face opposite directions. The connecting part 504 is located between the pre-contact part 502 and the conductive part 503 and is perpendicular to both of them.

[0054] The limiting part 501 is located inside the second housing. A groove corresponding to the second conductor limiting part is provided inside the second housing to accommodate the limiting part. The second conductor limiting part is located in the groove of the second housing and serves to limit the movement of the second conductor. The pre-contact part 502 is a pre-designed portion on the second conductor that will contact the first conductor, and is located inside the housing. The conductive part 503 is the portion that connects to an external circuit and is located outside the housing. The limiting part 501, the pre-contact part 502, the conductive part 503, and the connecting part 504 are integrally formed.

[0055] The second housing 6 is housed within the cavity of the first housing located on one side of the piston 3. A limiting protrusion 201 and an arc-shaped mounting boss 202 are provided within the cavity of the first housing, with a connecting hole formed on the arc-shaped mounting boss 202. A notch for the first conductor 4 and the second conductor 5 to pass through, and a clearance groove 203 are formed at the end face of the outer peripheral wall of the first housing.

[0056] The second housing 6 has an internal cavity for accommodating the conductor and reserving space for piston displacement. A limiting groove 601 for assembling the first conductor and a limiting groove 602 for assembling the second conductor are formed on the side wall of the cavity. The shape of the limiting grooves matches the bending shape of the conductors. The depth of the limiting groove 601 for assembling the pre-contact portion of the first conductor is less than the depth of the limiting groove 602 for assembling the pre-contact portion of the second conductor, ensuring the relative insulation distance between the first and second conductors. A positioning cylinder 605 is provided on the plane of the limiting grooves for assembling the pre-contact portions of the first and second conductors. When the first and second conductors are respectively installed in the limiting grooves 601 and 602, the positioning cylinder 605 passes through the through holes in the pre-contact portions of the first and second conductors, thus positioning the first and second conductors.

[0057] An arc-shaped mounting groove 603 is formed on the side wall of the second housing to mate with the first housing. The arc-shaped mounting groove is flush with the bottom of the cavity of the second housing and communicates with the internal cavity of the second housing. A through connection and fixing hole 606 is formed from the plane of the arc-shaped mounting groove. During assembly, bolts pass through the connection and fixing hole 606 of the second housing and the mounting boss of the first housing to fix the first housing and the second housing together as one unit.

[0058] Hook-shaped grooves 607, which accommodate hook-shaped protrusions 405, are provided on the end faces of the second housing above the limiting groove 602. The hook-shaped structure of the hook-shaped grooves and protrusions can better achieve the positioning and position limitation of the first conductor. Vertical receiving grooves (608, 609) are provided on the outer surfaces of the second housing above the limiting grooves 601 and 602 for accommodating the connection part of the first conductor and the second conductor. An exhaust hole 611 is provided on the end face outside the cavity of the second housing 6. When the excitation source releases high-pressure gas to drive the piston displacement, the high-pressure gas inside the housing is discharged to the outside of the housing through the exhaust hole 601.

[0059] A grid-like through-hole 610 is formed at the bottom of the internal cavity of the second housing 6, which serves both as an exhaust cooling mechanism and as a process hole with uniform wall thickness. Energy-absorbing ribs 604 are arranged in a T-shape laterally between the grid-like through-holes and the pre-contact portion of the second conductor, leaving space between them and the inner wall of the second housing to accommodate the limiting portion of the second conductor. After the second conductor is assembled, a certain gap remains between the pre-contact portion of the second conductor and the energy-absorbing ribs, providing a buffering effect. This facilitates the deformation and energy absorption of the pre-contact portion of the second conductor, preventing the second conductor from being pushed directly into the bottom of the cavity of the second housing and causing the second housing to crack. In addition, after the first conductor pre-contact is pushed to contact the second conductor pre-contact, under the action of the piston's motion inertia, the second conductor pre-contact will deform according to the shape of the T-shaped energy-absorbing rib, becoming a shape that is low on both sides and high in the middle in the width direction. At the same time, the second conductor pre-contact is constrained by the second conductor limiting part and the second shell support, and will form a shape that is high on both sides and low in the middle in the length direction. The deformed shape of the first conductor pre-contact will imitate the shape of the second conductor pre-contact.

[0060] In addition to the aforementioned slotted structures, the other slotted structures in the second housing 6 are all process slots designed to ensure uniform wall thickness.

[0061] The first conductor 4 and the second conductor 5 form conductive parts on the same mounting plane through a bending structure, which facilitates installation in external circuits. The conductive parts extend from the bottom of the housing and can be installed in external circuits by means of bolt crimping, quick-connect terminals, etc. In addition to the above structure in which both conductors are bent, either the second conductor or the first conductor can be set as a flat plate structure, and the other conductor can be bent to form a conductive part on the same mounting plane, so that the conductive parts of the first conductor and the second conductor extend from the contact surface of the inner cavities of the two housings.

[0062] In the above conductor structure, the pre-contact portions of the first and second conductors are set to be parallel to each other, and most of the bends are 90-degree bends. This is to simplify the conductor forming process. However, this example is not limited to this structure. The conductor bending structure can be common bending structures such as 30 degrees, 45 degrees, and 60 degrees. The pre-contact portions of the first and second conductors can also be in a certain angular position relationship. It is only necessary to ensure that: before the operation, the first and second conductors have sufficient insulation distance to avoid electrical breakdown and connection, and always be in the circuit disconnected state; after the operation, the pre-contact portions of the first and second conductors contact each other, and the circuit is in the closed state.

[0063] Working Principle: The excitation closure is initially in an open circuit state, meaning the first and second conductors are not in contact and are in an insulated state. Upon receiving an external excitation signal, the excitation source triggers the piston, which is then propelled by the high-pressure gas generated. During this movement, the piston deforms and bends the pre-contact portion of the first conductor, bringing it into contact with and pressing against the pre-contact portion of the second conductor. The serrated structure of the first conductor's pre-contact portion scrapes against the surface of the second conductor's pre-contact portion, increasing the contact area and establishing reliable electrical contact. At this point, the piston movement ends, and the operation is complete. During this process, the generated high-pressure gas is discharged outside the housing through the exhaust port and the bottom grid-like through-hole.

[0064] Example 2

[0065] See Figures 13 to 23 Based on Example 1, the structures of the first conductor 4 and the second conductor 5 are modified, and the shell structure is adapted accordingly. The excitation closure device in this example mainly includes an excitation source 1, a first shell 2, a piston 3, a first conductor 4, a second conductor 5, and a second shell 6.

[0066] The first conductor 4 is composed of a pre-contact portion 401, a conductive portion 402, and a connecting portion 403 that connects the two. The pre-contact portion 401 is a portion of the first conductor that is pre-set to contact the second conductor and is located inside the housing. The conductive portion 402 is a portion that is connected to an external circuit and is located outside the housing. The pre-contact portion 401, the conductive portion 402, and the connecting portion 403 are an integral structure.

[0067] The pre-contact portion of the first conductor 4 is supported on the second housing at one end near the connecting portion. The pre-contact portion 401 at the other end away from the connecting portion is configured as a V-shaped or U-shaped elastic structure 401a, that is, a V-shaped groove or U-shaped groove is formed on the upper surface of the pre-contact portion of the first conductor. The V-shaped groove or U-shaped groove protrudes from the lower surface of the pre-contact portion, and a V-shaped ridge or U-shaped ridge is formed on the lower surface of the contact portion accordingly.

[0068] The initial position of the first conductor pre-contact portion is defined by its own rigidity. The first conductor is limited by its bending shape, the convex-concave mating structure at its connection point, and the outer side of the second shell.

[0069] The second conductor 5 has a similar structure to the first conductor. The second conductor 5 consists of a pre-contact portion 501, a conductive portion 502, and a connecting portion 503 connecting the two. The pre-contact portion 501 is a pre-designed part on the second conductor 501 that contacts the first conductor and is located inside the housing; the conductive portion is the part that connects to the external circuit and is located outside the housing. The pre-contact portion 501, the conductive portion 502, and the connecting portion 503 are an integral structure.

[0070] The end of the second conductor pre-contact portion 501 away from the connecting portion is provided with a notch 501a to accommodate the V-shaped or U-shaped elastic structure 401a of the first conductor pre-contact portion. The two sides of the notch are bent downward to increase the contact area with the V-shaped or U-shaped elastic structure. The dead point of the bend is 90 degrees, but the bending angle of the two sides of the notch is less than 90 degrees to ensure a certain degree of elasticity. When the V-shaped or U-shaped elastic structure of the first conductor pre-contact portion is pushed into the second conductor notch, the elasticity of both the V-shaped or U-shaped elastic structure and the notch allows them to contact each other with a pre-tightening force, thereby improving the reliability of the contact.

[0071] The first conductor 4 and the second conductor 5 form conductive parts on the same mounting plane through a bending structure, which facilitates installation in external circuits. The conductive parts extend from the bottom of the housing and can be installed in external circuits by means of bolt crimping, quick-connect terminals, etc. In addition to the above structure in which both conductors are bent, either the second conductor or the first conductor can be set as a flat plate structure, and the other conductor can be bent to form a conductive part on the same mounting plane, so that the conductive parts of the first conductor and the second conductor extend from the contact surface of the inner cavities of the two housings.

[0072] In the above conductor structure, the pre-contact portions of the first and second conductors are set to be parallel to each other, and most of the bends are 90-degree bends. This is to simplify the conductor forming process. However, this example is not limited to this structure. The conductor bending structure can be common bending structures such as 30 degrees, 45 degrees, and 60 degrees. The pre-contact portions of the first and second conductors can also be in a certain angular position relationship. It is only necessary to ensure that: before the operation, the first and second conductors have sufficient insulation distance to avoid electrical breakdown and connection, and always be in the circuit disconnected state; after the operation, the pre-contact portions of the first and second conductors contact each other, and the circuit is in the closed state.

[0073] The second housing 6 has an internal cavity for accommodating the conductor and reserving space for piston displacement. Limiting grooves for assembling the first and second conductors are formed on the side wall of the second housing. The shape of the limiting grooves matches the bending shape of the conductors. The depth of the limiting groove 601 for assembling the pre-contact portion of the first conductor is lower than the depth of the limiting groove 602 for assembling the pre-contact portion of the second conductor, ensuring the relative insulation distance between the first and second conductors. A positioning cylinder is provided on the plane of the limiting grooves for assembling the pre-contact portions of the first and second conductors to limit their movement. An arc-shaped assembly groove 603, matching the first housing, is also formed on the side wall of the second housing. The arc-shaped assembly groove is flush with the bottom of the cavity of the second housing and does not penetrate the internal cavity of the second housing. A through-hole for connection and fixing is formed from the plane of the arc-shaped assembly groove.

[0074] A grid-like through-hole 610 is formed at the bottom of the internal cavity of the second housing 6, which serves both as a venting mechanism and as a process hole with uniform wall thickness. An energy-absorbing rib 604 is provided between the grid-like through-hole and the pre-contact portion of the second conductor. This rib, in conjunction with the V-shaped or U-shaped elastic structure of the pre-contact portion of the first conductor, forms a continuously decreasing slope structure. After the second conductor is assembled, the energy-absorbing rib is located between the notches of the pre-contact portion of the second conductor, serving to position and absorb energy after deformation and bending of the pre-contact portion of the first conductor, thus providing a buffering effect and preventing the pre-contact portion of the first conductor from being pushed directly into the bottom of the cavity of the second housing, which could cause the second housing to crack.

[0075] The vent 611 of the second housing 6 is connected to the internal cavity of the second housing through the notch structure 612.

[0076] In addition to the aforementioned slotted structures, the other slotted structures in the second housing 6 are all process slots designed to ensure uniform wall thickness.

[0077] The first housing 2 is provided with layered internal cavities that sequentially accommodate the excitation source, piston, conductor, and second housing. Each cavity has a different cross-sectional area. The cavity accommodating the conductor is equipped with corresponding limiting protrusions 201 and arc-shaped assembly protrusions 202, which align with the limiting groove and arc-shaped assembly groove of the second housing. The arc-shaped assembly protrusions also have connecting and fixing holes. Corresponding to the layered cavities, the exterior of the first housing is also designed with a stepped shape.

[0078] Working Principle: The excitation closure is initially in an open circuit state, meaning the first and second conductors are not in contact and are in an insulated state. Upon receiving an external excitation signal, the excitation source triggers the piston, which is driven by the high-pressure gas generated after triggering. During this movement, the piston pushes the pre-contact portion of the first conductor to deform and bend, making contact with and pressing against the pre-contact portion of the second conductor. This causes the V-shaped or U-shaped elastic structure of the first conductor pre-contact portion to embed into its notch, forming a reliable electrical contact. At this point, the piston movement ends, and the operation is complete. During operation, the generated high-pressure gas is discharged outside the housing through the exhaust port and the bottom grid-like through-hole.

Claims

1. A high-reliability excitation closure device, characterized in that, The system includes a first housing, a second housing disposed within the first housing, an excitation source, a piston, and an insulated first conductor and a second conductor. The first conductor and the second conductor are respectively disposed between the contact surfaces of the first housing and the second housing, with one end located outside the housing and the other end disposed in an insulated, non-contact manner on the second housing located inside the first housing. The first conductor and the second conductor each include a pre-contact portion, a connecting portion, and a conductive portion, with the connecting portion electrically connecting the pre-contact portion and the conductive portion. The excitation source receives an excitation signal and drives the piston to make the pre-contact portions of the first conductor and the second conductor located inside the first housing make conductive contact. During conductive contact, the deformation shape of the pre-contact portion of the first conductor mimics the deformation shape of the pre-contact portion of the second conductor, or the pre-contact portion of the first conductor is provided with an elastic structure, and the pre-contact portion of the second conductor is provided with a notch, with the elastic structure being engaged at the notch, so that the pre-contact portion of the first conductor and the pre-contact portion of the second conductor make conductive contact in a pre-tightening manner.

2. The high contact reliability excitation closure device according to claim 1, characterized in that, The pre-contact portion and the connecting portion are bent; the conductive portion is located outside the first housing and the second housing, the connecting portion is located between the contact surfaces of the first housing and the second housing, and the pre-contact portion of the first conductor and the second conductor is located on the second housing in an insulated and non-contact manner; the excitation source receives an excitation signal and drives the piston to make the pre-contact portion of the first conductor and the second conductor located inside the first housing make conductive contact.

3. The high contact reliability excitation closure device according to claim 2, characterized in that, The piston is supported within the first housing via a first conductor pre-contact portion.

4. The high contact reliability excitation closure device according to claim 2, characterized in that, A limiting structure is provided on the first conductor pre-contact portion and the second housing to restrict the initial position of the first conductor pre-contact portion.

5. The high contact reliability excitation closure device according to claim 2, characterized in that, A serrated structure is provided on the pre-contact end face of the first conductor.

6. The high contact reliability excitation closure device according to claim 2, characterized in that, A transverse energy-absorbing rib is provided between the second conductor pre-contact portion and the bottom of the second housing, and a gap is maintained between the energy-absorbing rib and the second conductor pre-contact portion; the pre-contact portion of the first conductor is located between the second conductor pre-contact portion and the piston; the excitation source receives the excitation signal to drive the piston to move, and drives the first conductor pre-contact portion to move and make conductive contact with the second conductor pre-contact portion.

7. The high contact reliability excitation closure device according to claim 2, characterized in that, The elastic structure is U-shaped or V-shaped.

8. The high contact reliability excitation closure device according to claim 7, characterized in that, The notch in the second conductor pre-contact portion is formed by elastic bending of less than 90° on both sides of the U or V-shaped elastic structure that engages with it.

9. The high contact reliability excitation closure device according to claim 6, characterized in that, The front end of the pre-contact portion of the second conductor is bent to form a limiting portion, which is inserted into the gap between the end of the energy-absorbing rib and the shell wall of the second housing.

10. The high contact reliability excitation closure device according to claim 2, characterized in that, The outer side and end face of the second housing located inside the first housing are respectively provided with communicating limiting grooves, and the first conductor and the second conductor are respectively located at the limiting grooves; a positioning structure for positioning the first conductor and the second conductor is provided at the limiting grooves.

11. The high contact reliability excitation closure according to any one of claims 1 to 10, characterized in that, The first housing and the second housing are provided with matching mounting bosses and mounting grooves at the contact point.

12. The high contact reliability excitation closure according to any one of claims 1 to 10, characterized in that, Limiting protrusions are respectively provided inside the first housing to press against the first conductor and the second conductor located on the shell wall of the second housing.

13. The high contact reliability excitation closure according to any one of claims 1 to 10, characterized in that, An exhaust port is provided on the end face of the second housing located inside the first housing.

14. The high contact reliability excitation closure according to any one of claims 1 to 10, characterized in that, A grid through-hole is provided at the bottom of the second housing.

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