Excitation closer for improving closing reliability

Abstract

An excitation closer capable of improving closing reliability comprises a shell with a cavity, a first conductor and a second conductor, the first conductor and the second conductor are arranged in the shell in a penetrating mode in an insulated and opposite spaced mode, an excitation source and a piston are arranged in the cavity of the shell, the piston is of a shell-shaped structure with one end open and one end closed, and at least the peripheral face of the piston is made of conductive materials. The open end of the piston faces the driving force release end of the excitation source, and the closed end of the piston is arranged corresponding to the relatively spaced ends of the first conductor and the second conductor; the excitation source can act according to a received trigger signal to release driving force to drive the piston to move towards the first conductor and the second conductor, so that the piston is clamped between the ends, oppositely arranged at intervals, of the first conductor and the second conductor in a plastic deformation mode, and the first conductor and the second conductor are conducted. According to the invention, the reliability of conduction between the first conductor and the second conductor is improved through the plastically deformed piston.

Description

An excitation closure device to improve closure reliability Technical Field

[0001] This invention relates to the fields of power control and electric vehicles, and in particular to an excitation closure device for 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, after the main circuit of an electric vehicle battery pack is cut off, the residual electrical energy in the energy storage components poses a significant safety hazard. Based on this discharge requirement, an excitation closure structure has emerged, which can quickly realize the circuit's normally open to normally closed function.

[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 closure is immediately triggered to quickly connect the grounding branch, releasing the electrical energy of the energy storage components in the main circuit to ensure the safety of subsequent operations.

[0006] CN202220062267.3 discloses an excitation closure device for enhanced insulation, comprising a housing, an excitation source disposed within the housing, a piston, a first conductor, a second conductor, and a cap-shaped third conductor sleeved on the piston. After the excitation source actuates, the piston drives the third conductor to move between the first and second conductors, establishing contact and thus enabling circuit conduction via the first, third, and second conductors. However, in this technical solution, because the third conductor is sleeved on the piston, when the piston drives the third conductor to contact the first and second conductors, the third conductor is restricted by the piston and cannot deform or deforms very little, resulting in a relatively small contact area between the third conductor and the first and second conductors, leading to unreliable conductivity. Summary of the Invention

[0007] The purpose of this invention is to provide an excitation closure device that improves the reliability of closure. By using a shell-shaped conductive piston to undergo plastic deformation between a first conductor and a second conductor, the contact area between the piston and the first and second conductors is increased, thereby improving the reliability of the first and second conductors after they are turned on.

[0008] To achieve the above objectives, the present invention provides an excitation closure device for improving closure reliability, comprising: a housing, a first conductor, a second conductor, a piston, and an excitation source; the housing has a cavity, the first conductor and the second conductor are respectively inserted into the housing in an insulated manner, one end of the first conductor and the second conductor located in the cavity of the housing are spaced apart and insulated from each other, the excitation source and the piston are respectively disposed in the cavity, the piston is a shell-like structure with one open end and one closed end, and at least the outer peripheral surface of the piston is made of conductive material; the open end of the piston is disposed towards the end that releases the driving force of the excitation source, and the piston... The closed end of the piston is positioned at the end of the first conductor and the second conductor that are spaced apart from each other. The piston is initially positioned by a limiting structure. The excitation source can act according to the received trigger signal, releasing a driving force to drive the piston to move toward the first conductor and the second conductor. The closed end of the piston passes between the ends of the first conductor and the second conductor that are spaced apart from each other. The ends of the first conductor and the second conductor that are spaced apart from each other abut against the outer circumferential surface of the piston, causing the piston to undergo plastic deformation. The piston is stuck between the ends of the first conductor and the second conductor that are spaced apart from each other in a plastic deformation manner, so that the first conductor and the second conductor are connected.

[0009] Preferably, the first and second conductors located in the cavity of the housing are arranged at opposite intervals at one end and bent and inclined in a hook-like structure in a direction away from the excitation source.

[0010] Preferably, the first conductor and the second conductor have a hook-shaped structure at one end, which is a multi-finger structure.

[0011] Preferably, the bending angle of the end of the first conductor and the second conductor that forms the hook-like structure is between 10 degrees and 60 degrees.

[0012] Preferably, the piston is a shell-like structure with a circular cross-section or a rounded rectangular cross-section, and the cross-sectional area of ​​the piston from the open end to the closed end is uniformly equal, or the cross-sectional area of ​​the piston from the open end to the closed end decreases uniformly, or the cross-sectional area of ​​the piston from the open end to the closed end decreases non-uniformly and has at least one stepped structure between the open end and the closed end of the piston.

[0013] Preferably, the limiting structure is at least one limiting post disposed within the housing.

[0014] Preferably, a rounded arc surface is provided on the outer periphery of the piston closed end or at the piston stepped structure, and the limiting post supports the rounded arc surface. The supporting surface of the limiting post is an inclined surface or a rounded arc surface.

[0015] Preferably, the piston has a flanged structure at its open end, and the limiting post supports the flanged structure of the piston.

[0016] Preferably, a rib is provided at the bottom of the housing cavity away from the excitation source, corresponding to the center diameter of the closed end of the piston. When the piston is displaced to the termination position, the rib causes the closed end of the piston to undergo plastic deformation.

[0017] Preferably, a buffer pad is provided at the bottom inside the closed end of the piston.

[0018] Preferably, a buffer pad is provided at the bottom inside the closed end of the piston.

[0019] Preferably, the housing includes a first housing and a second housing. The first housing has a through hollow portion. The second housing is nested at one end of the hollow portion of the first housing, closing off one end of the first housing. The excitation source is located at the other end of the hollow portion of the first housing, closing off the other end of the housing. The second housing has a receiving groove facing one end of the first housing. The receiving groove communicates with the hollow portion of the first housing to form a cavity of the housing. The first conductor and the second conductor are respectively disposed between the contact surfaces on opposite sides of the first housing and the second housing. The piston is located in the hollow portion of the first housing. The limiting structure is located on the inner wall of the receiving groove of the second housing and extends into the first housing to define the initial position of the piston.

[0020] The piston of the present invention is a thin-shell structure made of conductive material, such as a cap-shaped structure. When it is displaced to a position between the first conductor and the second conductor and is in contact with them, the piston can undergo adaptive plastic deformation according to the shape of the position between the first conductor and the second conductor, thereby increasing the contact area between the piston and the first conductor and the second conductor. Due to the plastic deformation of the piston, the piston is stuck between the first conductor and the second conductor, thus defining the piston termination position and improving the stability and reliability of the conductivity of the first conductor and the second conductor.

[0021] The piston of this invention is made of conductive material and has an integral structure, combining displacement and conductivity functions. It saves on parts, has a simpler structure, and is easier to process.

[0022] The housing structure of this invention improves and reduces exhaust, thus avoiding impact on surrounding devices.

[0023] The excitation closure device of the present invention can quickly connect the grounding branch after the fault current of the main circuit of the battery pack is cut off, so as to release the residual energy of the energy storage components in the main circuit and ensure the safety of subsequent operations. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the excitation closure structure in the initial state.

[0025] Figure 2 is a schematic diagram of the excitation closure structure when the piston is in the terminated position as shown in Figure 1.

[0026] Figure 3 is a schematic diagram of the piston structure in Figure 1.

[0027] Figure 4 is a schematic diagram of the excitation closure structure in the initial state under another structural configuration of the piston.

[0028] Figure 5 is a schematic diagram of the excitation closure structure when the piston is in the terminated position as shown in Figure 4.

[0029] Figure 6 is a schematic diagram of the piston structure in Figure 4.

[0030] Figure 7a is a schematic diagram of a hook-like structure with one end of the first conductor and the second conductor located in the cavity of the housing being insulated from each other.

[0031] Figure 7b is a schematic diagram of a hook-like structure with two fingers at one end, insulated from each other by the first and second conductors located in the cavity of the housing.

[0032] Figure 7c is a schematic diagram of a hook-like structure with three fingers at one end, insulated from each other by the first and second conductors located in the cavity of the housing.

[0033] Figure 8 is a schematic diagram of the structure with ribs at the bottom of the cavity of the housing and the piston in the initial position.

[0034] Figure 9 is a schematic diagram of the structure when the piston displacement in Figure 8 is at the termination position.

[0035] Figure 10 is a schematic diagram of the structure when a buffer pad is set at the closed end of the piston and the piston is in the initial position.

[0036] Figure 11 is a schematic diagram of the structure when the piston displacement in Figure 10 is at the termination position.

[0037] Figure 12 is a schematic diagram of the structure when the piston is in the initial position, with ribs provided at the bottom of the cavity of the housing, based on Figure 10.

[0038] Figure 13 is a schematic diagram of the structure when the piston displacement in Figure 12 is at the termination position.

[0039] Figure label:

[0040] Excitation source 1; first housing 2; piston 3; first conductor 4; second conductor 5; second housing 6; limiting post 601; flange structure 301; rib 9; buffer pad 10; end 4a of the first conductor located in the housing cavity; end 5a of the second conductor located in the housing cavity. Detailed Implementation

[0041] The present invention provides an excitation closure device for improving closure reliability, comprising: a housing, a first conductor, a second conductor, a piston, and an excitation source; the housing has a cavity, and the first conductor and the second conductor are respectively insulated from each other in the housing. One end of the first conductor and the second conductor located in the cavity of the housing is spaced apart and insulated from each other. The excitation source and the piston are respectively disposed in the cavity. The piston is a shell-shaped structure with one open end and one closed end, and at least its outer peripheral surface is made of conductive material. The open end of the piston is disposed towards the end of the excitation source that releases the driving force, and the closed end of the piston is disposed corresponding to the spaced-apart ends of the first conductor and the second conductor. The piston is limited to an initial position by a limiting structure. The excitation source can act according to a received trigger signal, releasing a driving force to drive the piston to move toward the first conductor and the second conductor, and the closed end of the piston passes between the spaced-apart ends of the first conductor and the second conductor. The spaced-apart ends of the first conductor and the second conductor abut against the outer peripheral surface of the piston, causing the piston to undergo plastic deformation. The piston is plastically deformed and locked between the spaced-apart ends of the first conductor and the second conductor, making the first conductor and the second conductor conductive.

[0042] The excitation source is a gas generator, which can activate upon receiving a trigger signal to release high-pressure gas as the driving force. The housing is made of non-conductive material.

[0043] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0044] The excitation closure device of the present invention, which improves closure reliability, is shown in Figures 1 to 3. The housing includes a first housing 2 and a second housing 6 connected to each other. The first housing 2 has a hollow portion extending through both ends, and the second housing 6 has a receiving groove at one end facing the first housing 2. A limiting step is provided at one end of the hollow portion of the first housing 2, and the second housing 6 is nested at the end of the hollow portion of the first housing 2 with the limiting step, thus closing one end of the hollow portion of the first housing 2. The hollow portion of the first housing and the receiving groove of the second housing are connected to form a cavity within the housing. This structure creates a turning structure at the contact surface of the first housing 2 and the second housing 6. The contact surface between the first housing and the second housing is relatively sealed, so that during operation, only a small amount of high-pressure gas will be discharged through the housing assembly gap, without affecting the surrounding components of the excitation closure device.

[0045] The excitation source 1 is fixedly disposed in the cavity at the end of the first housing 2 furthest from the second housing 6, and the excitation source 1 seals one end of the cavity of the first housing 2. The end of the excitation source 1 that releases the driving force is located inside the cavity of the housing, while the end that receives the trigger signal is located outside the first housing 2. The excitation source 1 can be fixed to the first housing 2 by interference fitting, by injection molding, or by setting a pressure cap on the outside of the first housing and combining it with a step in the hollow part of the first housing, so that the excitation source is located between the step and the pressure cap, thus fixing the excitation source.

[0046] A first conductor 4 and a second conductor 5 are respectively installed between the contact surfaces of the first housing 2 and the second housing 6 on opposite sides. The first conductor 4 and the second conductor 5 have a long, bent strip structure. The first conductor 4 and the second conductor 5 are arranged between the contact surfaces of the first housing 2 and the second housing 6 in a multi-bent state. The multi-bending method can better fix the first conductor and the second conductor. In order to better position the first conductor and the second conductor, limiting grooves are provided on the side walls and ends where the first housing and the second housing contact each other, or on the side walls and ends where the second housing and the first housing contact each other, to accommodate the first conductor and the second conductor. This ensures that the first conductor and the second conductor are located in the limiting grooves and prevents the first conductor and the second conductor portion located between the contact surfaces of the first housing and the second housing from sliding relative to the housing. The ends of the first conductor 4 and the second conductor 5 located outside the housing serve as the connection ends of the excitation closure device. They can be installed in the external circuit by means of bolt crimping, quick-connect terminals, etc. The ends located outside the housing can be in a bent state or a flat state, depending on the actual installation scenario. The first conductor 4 and the second conductor 5 are suspended in the cavity inside the housing, with their ends (4a, 5a) extending into the cavity. These ends are spaced apart and insulated from each other within the cavity. The structure of these spaced-apart and insulated ends can vary. For example, the first conductor 4 and the second conductor 5 are bent in a hook-like shape away from the excitation source 1, with a bending angle (the angle with the direction perpendicular to the piston displacement) less than 90 degrees. This ensures that the bent ends of the first conductor 4 and the second conductor 5 can cause plastic deformation of the piston during displacement. Preferably, the bending angle is between 10 and 60 degrees. Refer to Figures 7a to 7c, where: Figure 7a shows a single-finger hook-like structure with relatively poor elasticity; Figure 7b shows a two-finger hook-like structure with some elasticity; and Figure 7c shows a three-finger hook-like structure with higher elasticity than the single-finger and two-finger structures. The hook-like structure at one end of the first conductor 4 and the second conductor 5 allows the closed end of the piston to pass more smoothly between the first and second conductors, making the contact more reliable and preventing the piston from rebounding after deformation. The hook-like structure with two or more fingers allows for multi-point contact between the first conductor 4, the second conductor 5, and the piston, improving contact reliability. The piston 3 is disposed in the cavity of the first housing between the first conductor, the second conductor, and the excitation source 1. The piston 3 is supported and maintained in its initial position by a limiting structure disposed in the cavity of the housing. Referring to Figure 1, a limiting post 601 is provided on the inner wall of the accommodating groove of the second housing to form a limiting structure. The limiting post 601 is located on the inner wall of the cavity of the housing beside the first and second conductors. The limiting post 601 extends into the cavity of the first housing 2 to limit the piston 3, and the length of the limiting post 601 is parallel to the piston displacement path. To facilitate better displacement of the piston 3 when subjected to impact, the end of the limiting post 601 facing the excitation source 1 is set as a bevel or a rounded arc surface.The number and arrangement of the limiting posts 601 are set according to the principle of stabilizing the piston and limiting its initial position. There can be one limiting post or multiple limiting posts.

[0047] Piston 3 is a shell-like structure with thin walls, open at one end and closed at the other. For example, the piston is a shell-like structure with a circular or rounded rectangular cross-section. The cross-sectional area from the open end to the closed end of the piston is uniformly equal, or the cross-sectional area decreases uniformly from the open end to the closed end, or the cross-sectional area decreases non-uniformly from the open end to the closed end of the piston, and there is at least one step-like structure between the open end and the closed end of the piston. For example, a cap-like structure, a cylindrical structure closed at one end, or a conical cylindrical structure closed at one end, etc. Piston 3 is made of a conductive material and is integrally molded; or, at least the outer peripheral surface of piston 3 is made of a conductive material. The distance between the two opposite sides of the open end of piston 3 corresponding to the first conductor and the second conductor is greater than the minimum distance between the opposite ends of the hook-like structure of the first conductor and the second conductor. Preferably, the distance between the two opposite sides of the open end of piston 3 corresponding to the first conductor and the second conductor is greater than the distance between the first conductor and the second conductor. The height of piston 3 from the open end to the closed end is greater than the distance between the first conductor and the second conductor and the end point of piston 3's displacement, so that after piston 3 undergoes plastic deformation and is displaced to the end position, piston 3 is still located between the first conductor and the second conductor, so that the first conductor and the second conductor are connected. Moreover, the distance between the first conductor and the second conductor and the end point of piston 3's displacement can provide space for piston 3 to undergo plastic deformation.

[0048] The closed end of piston 3 is positioned towards the first and second conductors and located on the inclined surface or rounded arc surface of the limiting post 601. The limiting post 601 supports piston 3 and defines its initial position. When piston 3 has a stepped structure, the limiting post 601 can also support piston 3 on the stepped structure to define its initial position. The open end of piston 3 is positioned towards the excitation source 1. The driving force release end of the excitation source 1 is located inside the open end of piston 3. The excitation source 1 and the limiting post 601 position piston 3. To better support and limit piston 3, the side wall and bottom adjacent to the closed end of piston 3 in contact with the limiting post 601 are set with rounded arc surfaces. In this embodiment, referring to Figure 3, piston 3 is a cylindrical structure with a uniform outer diameter, open at one end and closed at the other.

[0049] Working principle:

[0050] When excitation source 1 receives a trigger signal, it releases high-pressure gas as a driving force. The high-pressure gas released by excitation source 1 immediately enters piston 3 and acts on the closed end of piston 3, driving piston 3 to overcome the limiting displacement of limiting post 601. During the displacement of piston 3, limiting post 601 acts on the outer wall of piston 3, leaving a straight groove on the outer wall of piston 3 corresponding to the limiting post, ensuring that piston 3 can make a straight displacement along limiting post 601. When piston 3 enters between the hook-shaped ends of the first conductor and the second conductor, the hook-shaped ends of the first conductor and the second conductor are slightly deformed under the impact of piston 3. The piston undergoes plastic deformation under the action of the hook-shaped structures of the first conductor and the second conductor and the bottom of the cavity of the second shell, and is stuck between the first conductor and the second conductor, as shown in Figure 2.

[0051] This invention utilizes a thin-walled, shell-like piston 3. When this piston is positioned between the ends of a first conductor and a second conductor, it undergoes plastic deformation due to the thin shell wall of the piston 3 under the pressure of the hook-like ends of the first and second conductors. This close contact with the hook-like ends of the first and second conductors, allowing the piston 3 to engage with them and establish a fixed position. The close contact between the piston 3 and the hook-like ends of the first and second conductors increases the contact area, ensuring reliable conductivity and reducing contact resistance.

[0052] Since the hook-shaped structure of the first and second conductors has a certain degree of elasticity at one end, when the piston 3 enters between the first and second conductors, the ends of the first and second conductors compress the side wall of the piston 3. At the same time, the ends of the first and second conductors are compressed by the piston 3, causing them to undergo elastic deformation. The elastic force generated by the elastic deformation acts on the side wall of the piston 3, which increases the force exerted by the first and second conductors on the side wall of the piston 3. This makes it easier for the piston 3 to undergo plastic deformation under the compression, increasing the contact area and improving the contact reliability.

[0053] Based on Figures 1 to 3, the structure of piston 3 and the position of the limiting structure are changed. Referring to Figures 4 to 6, piston 3 extends outward at its open end to form a flanged structure 301. The limiting structure is a limiting post 601, which is located on the inner wall of the cavity of the second housing 6 and extends into the first housing 2, fitting snugly against the inner wall of the cavity of the first housing 2. The end of the limiting post 601 facing the excitation source 1 is close to the end where the high-pressure gas is released from the excitation source 1. The flanged structure 301 at the open end of piston 3 is positioned on the end of the limiting post 601 facing the excitation source 1 for limiting. When the excitation source 1 releases high-pressure gas as a driving force to drive piston 3 to move, the flanged structure of piston 3 at the end of the limiting post 601 straightens and releases the limiting, allowing piston 3 to move along the cavity of the housing.

[0054] In some other embodiments, a rib 9 can be provided at the bottom of the cavity of the housing to cause plastic deformation of the closed end of the piston 9. Referring to Figures 8 and 9, a rib 9 is provided at the bottom of the cavity of the second housing 6 corresponding to the closed end of the piston 3. The rib 9 protrudes from the bottom of the cavity of the second housing, and its length extends through the maximum outer diameter of the closed end of the piston 3. The rib 9 is provided in a manner that does not affect the piston displacement and the conduction of the first conductor and the second conductor, and allows the closed end of the piston 3 to undergo plastic deformation. Preferably, the length direction of the rib 9 is perpendicular to the line connecting the first conductor and the second conductor, and the rib 9 is located at the center position between the two ends of the first conductor and the second conductor that are spaced apart. At least one rib is provided.

[0055] When piston 3 moves to its final position, the opposing side walls of piston 3 undergo plastic deformation under the action of the end between the first and second conductors. Simultaneously, when the closed end of piston 3 contacts the rib 9, plastic deformation occurs at the closed end of piston 3. The degree of plastic deformation at the closed end of piston 3 is determined by the height and width of the rib 9 protruding from the bottom of the cavity of the housing. By providing the rib 9, the plastic deformation of piston 3 is increased, resulting in a tighter contact and a larger contact area between piston 3 and the first and second conductors.

[0056] Because piston 3 needs to undergo plastic deformation when it comes into contact with the first and second conductors, the shell wall of piston 3 is relatively thin. When the high-pressure gas released by the excitation source acts on piston 3, it acts directly on the closed end of piston 3. Therefore, the impact force on the closed end of piston 3 is the greatest, which may cause the closed end of piston 3 to rupture.

[0057] To reduce the impact force of the high-pressure gas released from the excitation source 1 on the closed end of the piston 3, a buffer pad 10 is provided at the bottom of the closed end of the piston 3 to buffer the impact force. Referring to Figures 10 and 11, no rib 9 is provided at the bottom of the cavity of the housing, and a buffer pad 10 is provided at the bottom inside the closed end of the piston 3. The buffer pad 10 matches the shape of the inner side of the closed end, and the buffer pad 10 has a certain thickness covering the bottom surface inside the closed end of the piston 3. The buffer pad 10 is made of a soft material that can absorb energy. The buffer pad 10 absorbs part of the impact energy through its own deformation, thereby achieving the effect of buffering the impact force. At the same time, due to the buffer pad, the piston 3 can be subjected to force more evenly, avoiding piston 3 breakage. In addition, because the buffer pad is relatively soft, it will not hinder the deformation of the piston 3. In this embodiment, the material of the buffer pad 10 is a silicone pad. Referring to Figure 11, a buffer pad 10 is provided at the bottom of the closed end of the piston 3. When the piston 3 is moved to the end position, the two ends of the buffer pad 10 adjacent to the side wall of the piston 3 will deform, so that the two ends of the buffer pad 10 are located between the plastically deformed side wall and the bottom of the closed end of the piston 3.

[0058] A buffer pad 10 is provided inside the closed end of the piston 3. It should be noted that the thickness of the buffer pad 10 should not affect the plastic deformation of the sidewall of the piston 3. When the rib 9 is provided, the thickness and flexibility of the buffer pad 10 should not affect the plastic deformation of the sidewall and closed end of the piston 3. Referring to Figures 12 and 13, the rib 9 is provided at the bottom of the cavity of the second housing 6, and the buffer pad 10 is provided at the bottom inside the closed end of the piston 3. Referring to Figure 13, when the piston 3 is moved to the termination position, the first conductor 4, the second conductor 5, and the rib 9 cause plastic deformation of both the sidewall and closed end of the piston 3. Since the buffer pad 10 is made of a relatively soft material, the buffer pad 10 deforms along with the plastic deformation of the piston 3. The two ends of the buffer pad 10 are clamped and fixed in place by the plastically deformed sidewall and the bottom of the closed end of the piston 3, which can prevent the buffer pad 10 from flying out of the piston 3.

Claims

1. An excitation closure device for improving closure reliability, characterized in that, The device includes: a housing, a first conductor, a second conductor, a piston, and an excitation source; the housing has a cavity, the first conductor and the second conductor are respectively inserted through the housing in an insulated manner, one end of the first conductor and the second conductor located in the cavity of the housing are spaced apart and insulated from each other, the excitation source and the piston are respectively disposed in the cavity, the piston is a shell-shaped structure with one end open and one end closed, and at least the outer peripheral surface of the piston is made of conductive material; The piston's open end faces the end from which the driving force is released by the excitation source, and its closed end corresponds to the end of the first conductor and the second conductor that are spaced apart. The piston's initial position is defined by a limiting structure. The excitation source can act according to the received trigger signal, releasing a driving force to drive the piston to move towards the first conductor and the second conductor. The closed end of the piston passes between the ends of the first conductor and the second conductor that are spaced apart. The ends of the first conductor and the second conductor that are spaced apart come into contact with the outer peripheral surface of the piston, causing the piston to undergo plastic deformation. The piston is plastically deformed and locked between the ends of the first conductor and the second conductor that are spaced apart, thus making the first conductor and the second conductor conductive.

2. The excitation closure device according to claim 1, characterized in that, The first and second conductors, located in the cavity of the housing, have their ends bent and tilted in a hook-like structure away from the excitation source.

3. The excitation closure device according to claim 2, characterized in that, The first conductor and the second conductor each have a hook-shaped structure at one end, which is a multi-finger structure.

4. The excitation closure device according to claim 2, characterized in that, The bending angle of the first conductor and the second conductor at the end of the hook-shaped structure is between 10 degrees and 60 degrees.

5. The excitation closure device according to claim 1, characterized in that, The piston is a shell-like structure with a circular or rounded rectangular cross-section. The cross-sectional area of ​​the piston from the open end to the closed end is uniformly equal, or the cross-sectional area of ​​the piston from the open end to the closed end decreases uniformly, or the cross-sectional area of ​​the piston from the open end to the closed end decreases non-uniformly and has at least one stepped structure between the open end and the closed end of the piston.

6. The excitation closure device according to claim 5, characterized in that, The limiting structure is at least one limiting post disposed within the housing.

7. The excitation closure device according to claim 6, characterized in that, The piston's closed end has a rounded arc surface on its outer periphery or at the piston's stepped structure. The limiting post supports the rounded arc surface, and the supporting surface of the limiting post is an inclined surface or a rounded arc surface.

8. The excitation closure device according to claim 6, characterized in that, The piston has a flanged structure at its open end, and the limiting post supports the flanged structure of the piston.

9. The excitation closure device according to any one of claims 1 to 8, characterized in that, A raised rib is provided at the bottom of the housing cavity, which is far from the excitation source, corresponding to the center diameter of the closed end of the piston. When the piston is displaced to the termination position, the raised rib causes the closed end of the piston to undergo plastic deformation.

10. The excitation closure device according to claim 9, characterized in that, A buffer pad is provided at the bottom inside the closed end of the piston.

11. The excitation closure device according to any one of claims 1 to 8, characterized in that, A buffer pad is provided at the bottom inside the closed end of the piston.

12. The excitation closure device according to any one of claims 1 to 8, characterized in that, The housing includes a first housing and a second housing. The first housing has a through hollow portion. The second housing is nested in the hollow portion of the first housing, closing one end of the first housing. The excitation source is located at the other end of the hollow portion of the first housing, closing the other end of the housing. The second housing has a receiving groove facing the first housing. The receiving groove communicates with the hollow portion of the first housing to form a cavity in the housing. The first conductor and the second conductor are respectively disposed between the contact surfaces on opposite sides of the first housing and the second housing. The piston is located in the hollow portion of the first housing. The limiting structure is located on the inner wall of the receiving groove of the second housing and extends into the first housing to define the initial position of the piston.

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