Excitation closer of integrated power resistor

Abstract

The utility model relates to the field of electric power control and electric automobiles, in particular to an excitation closer of an integrated power resistor, which comprises a shell, an excitation source, a piston, a first conductor and a second conductor, the excitation source and the piston are arranged in the shell, the first conductor and the second conductor are insulated from each other, and one or both of the first conductor and the second conductor are respectively connected in series with at least one power resistor. The first conductor and the second conductor which are connected in series with the power resistor are still insulated from each other; and the excitation source can act according to a received trigger signal to release high-pressure gas as a driving force to drive the piston to displace, so that the first conductor and the second conductor are contacted and conducted, and the power resistor is connected in series in a circuit conducted by the first conductor and the second conductor. And through series connection of the power resistors, the current of the loop can be limited, the energy of the closer function is shared, and the overall energy tolerance performance is improved. And a fuse structure can be additionally connected in series, so that the loop protection is realized, and the safety is improved.

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, specifically to the excitation closure of an integrated power resistor used for circuit protection. 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, when the main circuit of an electric vehicle battery pack is disconnected, corresponding protection devices exist for the rapid release of residual energy in the energy storage components. These devices are normally open to normally closed switching excitation devices, which can quickly switch the circuit from normally open to normally closed. However, these excitation devices often have a small current pulse capacity and are unsuitable for large pulse applications. Based on this deficiency, an excitation closure device integrating a power resistor has been invented. Resistors with high rated power are called power resistors. As important components in circuits, power resistors have functions such as current limiting, voltage reduction, heating, and current regulation. A power resistor is a resistive device capable of withstanding high power and large current, and is commonly used in circuits of power supplies, motors, and electrical appliances to limit current and modify circuit characteristics. Compared to ordinary resistors, power resistors have higher power tolerance and lower resistance. When a large pulse current occurs, the power resistor limits the current, allowing the excitation closure to discharge stably without being damaged midway. Furthermore, the power resistor of this invention can self-melt under extremely high current conditions to protect the circuit from damage. Summary of the Invention

[0005] The purpose of this invention is to provide an excitation closure device with an integrated power resistor. By connecting a series power circuit, after the closure device is closed, the power resistor regulates and limits the residual energy of the energy storage component, ensuring reliable discharge of the excitation closure device.

[0006] To achieve the above objectives, the present invention provides an integrated power resistor excitation closure device, comprising a housing and an excitation source, a piston, a first conductor and a second conductor insulated from each other disposed within the housing. At least one power resistor is connected in series with one or both of the first conductor and the second conductor, and the first conductor and the second conductor remain insulated from each other after the power resistor is connected in series. The excitation source can act according to a received trigger signal, releasing high-pressure gas as a driving force to drive the piston to move, so that the first conductor and the second conductor make contact and conduct, and the power resistor is connected in series in the circuit where the first conductor and the second conductor are conducting.

[0007] Preferably, the power resistor has a wavy or spiral structure.

[0008] Preferably, when the power resistor has a wavy structure, the power resistor has a ring-shaped wavy structure, a polygonal wavy structure, or a non-ring-shaped wavy structure; when the power resistor has a spiral structure, the power resistor has a spiral filament structure or a spiral sheet structure.

[0009] Preferably, when the power resistor is a closed-loop wavy structure, one side of the power resistor relative to the center is electrically connected to the first conductor or the second conductor, and the other side is electrically connected to one of the conductive terminals of the excitation closure, or connected to the fuse structure, or passes through the housing to form one of the conductive terminals of the excitation closure; when the power resistor is an open-loop wavy structure, a non-loop wavy structure, a spiral filament structure, or a spiral sheet structure, one end of the power resistor is electrically connected to the first conductor or the second conductor, and the other end is electrically connected to one of the conductive terminals of the excitation closure, or connected to the fuse structure, or passes through the housing to form one of the conductive terminals of the excitation closure; the end of the first conductor and / or the second conductor not connected in series with the power resistor passes through the housing to form another conductive terminal of the excitation closure; when the first conductor and the second conductor are connected, a series relationship is formed between the power resistor, the first conductor, the second conductor, and the fuse structure.

[0010] Preferably, the power resistor, the first conductor, the second conductor, and the fuse structure are connected to each other by welding or crimping.

[0011] Preferably, when the power resistor has an annular wave-like structure, a polygonal wave-like structure, a spiral filament structure, or a spiral sheet structure, the power resistor is located in the housing on the outer periphery of the piston displacement path.

[0012] Preferably, the first conductor and the second conductor located within the housing are offset and insulated at their closest ends, and are respectively located on the displacement path of the piston; when the piston is displaced, the piston drives one end of the first conductor to move toward one end of the second conductor, and makes one end of the first conductor make conductive contact with one end of the second conductor.

[0013] Preferably, when the first conductor and the second conductor located within the housing are offset and insulated at their closest ends, the first conductor within the housing is configured as a U- or V-shaped elastic structure, and one end of the second conductor is configured as a notch structure, wherein the notch structure is formed by elastic bending at an angle of less than 90° relative to the two sides; when the piston drives the end of the first conductor configured as a U- or V-shaped elastic structure to move toward the end of the second conductor configured with the notch structure, the U- or V-shaped elastic structure is engaged at the notch structure, thereby making the first conductor and the second conductor conductive.

[0014] Preferably, the ends of the first conductor and the second conductor that are close to each other are insulated from each other, and the ends of the first conductor and the second conductor that are opposite each other are located on the displacement path of the piston; the piston is made of conductive material, and when the piston is displaced, the piston can be displaced between the ends of the first conductor and the second conductor and make conductive contact with the first conductor and the second conductor respectively, so that the first conductor and the second conductor are connected.

[0015] Preferably, when the ends of the first conductor and the second conductor are insulated from each other, the opposite ends of the first conductor and the second conductor are respectively bent in a direction away from the piston, and the piston has a cap-shaped structure with one end open and the other end closed, with the open end of the piston facing the direction of the excitation source.

[0016] Preferably, the excitation closure includes at least one of the following structures, such that the conductor circuit consisting of the first conductor, the power resistor, and the second conductor connected in series can be melted after the excitation closure is closed:

[0017] The power resistor has a fusible area; or...

[0018] A fuse structure is connected in series in the circuit formed by the first conductor, the second conductor, and the power resistor, or a fusible element is connected in series inside the excitation closure to form a fuse structure, or a fusible component is connected in series.

[0019] Preferably, the fusible region on the power resistor is a narrow neck, or the melting point of the material of the fusible region is lower than the melting point of the power resistor material outside the fusible region.

[0020] Preferably, the fusible region and the melt are located in the arc-extinguishing medium.

[0021] Preferably, the housing comprises a first housing and a second housing joined together, the first housing and the second housing having a communicating first cavity, the excitation source and the piston being disposed in the first cavity of the first housing, the first conductor and the second conductor being entirely disposed in the second housing, or entirely disposed between the first housing and the second housing, or one of the first conductor and the second conductor being disposed in the second housing and the other being disposed between the first housing and the second housing; the adjacent and insulated ends of the first conductor and the second conductor are respectively located in the first cavity and on the piston displacement path; at least one second cavity is disposed outside the first cavity, and the power resistor and the fuse structure are respectively disposed in the second cavity.

[0022] Preferably, when the power resistor has a ring-shaped wave structure or a spiral structure, the second cavity is arranged around the first cavity to form a ring-shaped second cavity.

[0023] Preferably, when the power resistor is a spiral filament structure or a spiral sheet structure, a spiral groove is formed on the side wall of the second cavity near the first cavity, the power resistor is nested in the spiral groove, and one end that is conductively connected to the first conductor or the second conductor is located outside the spiral groove.

[0024] Preferably, when the power resistor has a spiral filament structure or a spiral sheet structure, a support sleeve is provided in the second cavity, and the power resistor is wound around the support sleeve.

[0025] Preferably, the second cavity portion containing the power resistor is filled with an arc-quenching medium.

[0026] Preferably, when the power resistor is connected in series with the fuse structure and the power resistor and the fuse structure are located in the same second cavity, the power resistor and the fuse structure are separated by a sealed isolation method.

[0027] Preferably, it further includes a base located at one end of the first housing where the second housing is located. The base encloses the second cavity and provides support for the power resistor or fuse structure housed in the second cavity. Alternatively, the base encloses the second cavity and provides support for the power resistor or fuse structure housed in the second cavity while simultaneously providing support and positioning for the second housing.

[0028] Preferably, the power resistor is a wire-wound power resistor, a film power resistor, or a solid ceramic resistor.

[0029] The excitation closure of the integrated power resistor of the present invention closes when the main circuit is cut off, enabling the energy storage device to release residual energy through the closure of the excitation closure. During the release of residual energy, the power resistor limits, consumes, and regulates the residual energy to ensure reliable discharge of the energy storage device.

[0030] It has the function of a series power resistor, which can limit the current in the circuit, share the energy of the closure function, and improve the overall energy tolerance performance.

[0031] The power resistor has a fuse function, which can melt under extreme fault current to protect the circuit cables and closures from damage.

[0032] Through integrated design, as well as the bending design of the first and second conductors, and the nesting of the cavity where the power resistor is located with the piston, the excitation source, and the cavity where the first and second conductors make conductive contact after being driven, the excitation closure structure is made more compact and smaller in size.

[0033] The power resistor is designed in the second cavity on the outer periphery of the excitation source, which limits the impact of the driving force released by the excitation source to the first cavity inside the shell. The second cavity can also buffer the impact, improve the shell strength of the excitation closure, avoid the shell cracking and other safety hazards that may be caused by the impact of the excitation source's release driving force, and improve the safety and reliability of the excitation closure. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the pre-action excitation closure structure.

[0035] Figure 2 yes Figure 1 A schematic diagram of the structure after the action.

[0036] Figure 3 yes Figure 1 A schematic diagram of one end of the first conductor and the second conductor located in the first cavity.

[0037] Figure 4 This is a schematic diagram of a power resistor structure with a ring-shaped, wave-like structure.

[0038] Figure 5 This is a schematic diagram of the structure between the ring-shaped power resistor and the first housing.

[0039] Figure 6 This refers to the connection method between the power resistor and the second conductor.

[0040] Figure 7 This is a schematic diagram of the excitation closure structure when the power resistor has another structural form.

[0041] Figure 8 This is a schematic diagram of an excitation closure structure with two power resistors connected in series.

[0042] Figure 9 This is a schematic diagram of a power resistor with a spiral filament structure and a circular cross-section.

[0043] Figure 10 This is a schematic diagram of a power resistor with a spiral filament structure and a square cross-section.

[0044] Figure 11 This is a schematic diagram of an excitation closure structure with a spiral power resistor, the cross-section of which is circular.

[0045] Figure 12 This is a schematic diagram of an excitation closure structure with a spiral power resistor, and the cross-section of the power resistor is square.

[0046] Figure 13 This is a schematic diagram of an excitation closure structure in which a power resistor is mounted on a support tube.

[0047] Figure 14 This is a schematic diagram of an excitation closure structure with the piston made of conductive material and the first and second conductors spaced apart before the action.

[0048] Figure 15 yes Figure 13 A schematic diagram of the structure after the action.

[0049] Figure 16 yes Figure 13 The diagram shows a structure in which the first and second conductors are positioned at an angle and bent at one end.

[0050] Figure 17 This is a schematic diagram of a non-circular, wavy power resistor and a fuse structure located in the same second cavity.

[0051] Figure label:

[0052] Excitation source 1, first housing 2, rib structure 201, piston 3, first conductor 4, second conductor 5, second housing 6, power resistor 7, connection end 701, conductive terminal 702, narrow neck 703, base 8, screw 9, conductive terminal 10, support sleeve 11, isolation sealing structure 13, fuse structure 14, base 15. Detailed Implementation

[0053] An integrated power resistor excitation closure device of the present invention includes a housing and an excitation source, a piston, a first conductor and a second conductor that are insulated from each other disposed in the housing. At least one power resistor is connected in series with one or both of the first conductor and the second conductor, and the first conductor and the second conductor remain insulated from each other after the power resistor is connected in series. The excitation source can act according to a received trigger signal, release high-pressure gas as a driving force to drive the piston to move, so that the first conductor and the second conductor make contact and conduction, so that the power resistor is connected in series in the circuit where the first conductor and the second conductor are conducting.

[0054] The excitation source is a gas generator, which can activate upon receiving a large trigger signal to release high-pressure gas as the driving force.

[0055] Power resistors are energy-consuming components that serve functions such as current limiting, voltage reduction, heat generation, and current regulation. A power resistor is a resistive device capable of handling high power and large current, typically used in circuits of power supplies, motors, and electrical appliances to limit current and modify circuit characteristics. Compared to ordinary resistors, power resistors have higher power handling capacity and lower resistance values.

[0056] Power resistors are made of materials such as metals, metal alloys, and graphite. They can be designed into suitable shapes using metals or alloys with high resistivity, or commercially available power resistors can be used directly, such as wire-wound power resistors, film power resistors, and solid ceramic resistors. Examples include: metal film resistors, carbon film resistors, metal oxide resistors, and ceramic resistors. Among them:

[0057] Metal film resistor: A type of resistor that uses a thin metal film as the resistive material. It has advantages such as good stability, high precision, and low noise, and is suitable for high-precision circuits.

[0058] Carbon film resistors: Carbon film resistors are resistive devices that use carbon film as the resistive material. They have advantages such as good versatility and low price, and are suitable for general circuit design.

[0059] Metal oxide resistors: Metal oxide resistors are resistive devices that use metal oxides as the resistive material. They have advantages such as high power and high stability, and are suitable for high power and high temperature circuits.

[0060] Ceramic resistors: Ceramic resistors are resistive devices composed of ceramic as the base material and materials such as metal film and carbon film. They have the characteristics of high temperature, high pressure, high frequency and corrosion resistance, and are suitable for high frequency circuits.

[0061] To enable the excitation closure to have a fusible function, a fusible region is incorporated into the power resistor. This fusible region can be a neck, or the material of the fusible region can have a lower melting point than the material of the power resistor outside the fusible region, ensuring that the fusible region melts first. Alternatively, a fusible and conductive component can be connected in series in the circuit formed by the first conductor, the second conductor, and the power resistor in the excitation closure. This could be a fuse structure, a fusible element, or a structure with series-connected fusible elements and an arc-extinguishing medium filling the periphery of the fusible element to form a fuse-like structure. A neck refers to a variable cross-section structure on the power resistor, with the smallest cross-section point being the neck. The fusible region of the power resistor is located within the arc-extinguishing medium.

[0062] Power resistors can have a conventional structure, a wavy structure, or a spiral structure. When the power resistor has a wavy structure, it can be a ring-shaped wavy structure, a polygonal wavy structure, or a non-ring-shaped wavy structure. When the power resistor has a spiral structure, it can be a spiral wire structure or a spiral plate structure. When the power resistor has a wavy structure, a neck is provided on the power resistor. When the power resistor has a spiral structure, a neck can be provided as needed.

[0063] The preferred shape of the power resistor is a ring-shaped wavy structure, a polygonal wavy structure, a spiral filament structure, or a spiral plate structure. This structure allows the power resistor to be positioned on the outer periphery of the piston displacement path, fully utilizing the housing space of the excitation closure and reducing the volume of the excitation closure.

[0064] When multiple power resistors are connected in series, the resistance in the circuit where the first and second conductors are conducting increases significantly due to the series connection of multiple power resistors, which can further limit the current. At the same time, it leads to increased power consumption in the circuit, which consumes the energy required by the circuit more quickly.

[0065] 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.

[0066] The excitation closure device of the present invention, see [link / reference] Figures 1 to 5The housing includes a first housing 2 and a base 8, with a second housing 6 disposed between the first housing 2 and the base 8. The first housing 2 has a concentric through-hole portion and an annular second hollow portion surrounding the outer periphery of the first hollow portion. An excitation source 1 is disposed at one end of the first hollow portion of the first housing 2 and this end is closed. The excitation source 1 can be integrally formed into the first housing 2 by injection molding, or it can be fixed by setting a limiting step and a pressure plate in the first hollow portion. The base 8 is disposed at the end of the first housing 2 away from the excitation source 1 and closes the end of the first housing 2 that contacts it. The second housing 6 is disposed in the first hollow portion between the base 8 and the first housing 2. A receiving groove is formed at the end of the second housing 6 that contacts the first housing 2, and the receiving groove of the second housing 6 and the first hollow portion between the first housing 2 form a first cavity. A second cavity is formed in the second hollow portion between the base 8 and the first housing 2. Limiting grooves for accommodating a first conductor and a second conductor are respectively formed between the contact surfaces of the second housing 6 and the first housing 2 on opposite sides, and on the opposite side walls of the second housing 6. The depth of the limiting groove for accommodating the first conductor is less than the depth of the limiting groove for accommodating the first conductor, resulting in different contact surfaces between the second housing 6 and the first housing 2. The accommodating groove and the limiting groove for accommodating the second conductor are interconnected. The first housing 2, the second housing 6, and the base 8 are fixedly connected by screws 9, and can also be fixedly connected by riveting or welding.

[0067] A first conductor 4 and a second conductor 5 are respectively installed on opposite sides between the first housing 2 and the second housing 6. The first conductor 4 is bent and installed in the limiting groove on the second housing 6. One end of the first conductor passes through the higher contact surface between the first housing and the second housing and enters the first cavity, where it is suspended. That is, one end of the first conductor in the first cavity is close to the excitation source, and the other end passes through the side wall and bottom of the second housing 6, bends, and passes through the base 8 to be located outside the base 8, forming one of the conductive terminals of the excitation closure device.

[0068] The second conductor 5 is bent and positioned in a limiting groove on the other side of the second housing 6. One end of the conductor passes through the lower contact surface between the first and second housings, is located in the first cavity, and abuts against the bottom of the receiving groove of the second housing 6. That is, the end of the second conductor 5 in the first cavity is at a greater distance from the excitation source. The other end of the second conductor 5 passes through the side wall of the second housing and between the first housing 2 and the base 8. The ends of the first conductor and the second conductor in the first cavity are insulated from each other and directly opposite each other, forming a spatially misaligned and insulated configuration. The bottom of the first cavity, i.e., the bottom of the receiving groove of the second housing 6, is set as an inclined structure, and the inclination angle matches the trajectory of the first conductor 4 in the first cavity after being impacted by the piston 3. In the initial position, the first conductor 4 and the second conductor 5 are absolutely insulated from each other. When the piston moves, it can drive the end of the first conductor in the first cavity to move towards the end of the second conductor and make conductive contact with the second conductor.

[0069] A positioning structure is provided at the contact surface between the first housing 2 and the second housing 6 through which the second conductor passes, for positioning the second conductor. The positioning structure consists of a positioning post on the second housing, with a positioning hole on the second conductor corresponding to the position of the positioning post. The positioning post passes through the positioning hole of the second conductor to position it. This positioning structure prevents potential impact to the second conductor when the first conductor is pushed by the piston into conductive contact, thus avoiding the second conductor from retracting due to impact and causing poor contact. Alternatively, a positioning structure can be provided at the first conductor to position it.

[0070] See Figure 1 and Figure 2 The multiple bending design of the first conductor 4 and the second conductor 5 can save space and reduce volume to the greatest extent.

[0071] See Figure 3, one end of the first conductor 4 located in the first cavity formed by the first housing and the second housing is set as an elastic structure in the shape of U or V. That is, the part between the two sides of the end of one end of the first conductor 4 located in the first cavity protrudes towards the direction of the second conductor 5, and one end of the first conductor located in the first cavity has a certain elasticity. Therefore, an elastic structure in the shape of U or V is formed at one end of the first conductor 4. One end of the second conductor 5 located in the first cavity also has a certain elasticity corresponding to the elastic structure of the first conductor 4, and is set as a U-shaped notch structure. The two side edges of the notch of the second conductor 5 are elastically bent at an angle less than 90°. The formation of this notch structure can be achieved through the following method: perform a T-shaped cut at the central part of the end of one end of the first conductor 5, and then bend the two cut parts of the end of the first conductor 5 away from the first conductor at an angle less than 90° to form the notch structure. Under the impact of the piston 3, the U or V-shaped elastic structure of the first conductor 4 is pushed into the notch structure of the second conductor 5. Relying on the elasticity of both the U or V-shaped elastic structure and the notch structure, the two are in contact with a pre-tightening force, causing the contacting ends of the first conductor 4 and the second conductor 5 to deform and lock with each other, improving the contact reliability.

[0072] The first housing, the second housing and the base are sealed, which can not only prevent foreign objects from contaminating the fracture, but also prevent the high-temperature arc from spraying out of the housing and damaging the surrounding devices. <000017​​​​​​​​​​As shown, welding can also be used. A conductive terminal 702 on the other side of the power resistor 7 passes between the first housing 2 and the base 8, located outside the base, forming one of the conductive terminals of the excitation closure. A through-hole is formed on the annular wavy structure of the power resistor 7, and a neck 703 is formed at the location of the through-hole. When the power resistor 7 encounters an extreme current, it can melt at the neck position, or the neck can be omitted. For the shape of the power resistor 7, see [reference needed]. Figure 5 A ring-shaped rib structure 201 is provided in the second cavity of the first housing 2 that houses the power resistor, which serves to support and limit the power resistor 7. The second cavity that houses the power resistor 7 is filled with an arc-quenching medium, such as quartz sand, alumina, ceramic powder, or arc-quenching gel, so that the power resistor 7 also has a fusing function. After the excitation closure is activated, the two conductors come into contact, and the power resistor connected in series with the conductors can act as a fusible element to quickly melt and break, consuming the energy in the circuit and forming a discharge effect. After the discharge is completed, the melting of the power resistor can also form a break, thereby achieving circuit protection.

[0075] The power resistor 7 adopts a ring-shaped, wave-like sheet structure and is fitted onto the outer periphery of the first cavity, which can save space as much as possible. Moreover, by setting a second cavity, the impact force of the high-pressure gas released by the excitation source acts directly on the first cavity. Due to the existence of the second cavity, the impact of the driving force released by the excitation source is buffered to a certain extent, thereby improving the working reliability of the shell and reducing the safety risk of shell cracking.

[0076] In this embodiment, one end of the power resistor 7, which is connected in series with the second conductor, and one end of the first conductor 4 extend outside the housing, respectively, serving as two conductive terminals of the excitation closure device.

[0077] Working principle:

[0078] In the initial position, the first conductor 4 and the second conductor 5 are insulated from each other, and the circuit connected to the excitation closure is in an open state.

[0079] When the excitation source 1 acts according to the received trigger signal, it releases high-pressure gas as a driving force to drive the piston 3 to move along the first cavity. The piston 3 drives the suspended end of the first conductor 4 in the first cavity to move toward the end of the second conductor 5 in the first cavity, so that the end of the first conductor 4 in the first cavity makes conductive contact with the end of the second conductor 5, realizing the conduction between the first conductor and the second conductor. This changes the circuit connected to the excitation closure from the open state to the conductive state, and connects the power resistor into the circuit. The power resistor consumes the energy in the circuit and suppresses the current, thus jointly realizing the discharge function.

[0080] Figure 4In this embodiment, the power resistor 7 has a ring-shaped wavy structure. In some embodiments, the power resistor 7 can also adopt a polygonal wavy structure.

[0081] When the power resistor 7 is provided with a narrow neck, the narrow neck 703 of the power resistor begins to melt during the discharge process until the narrow neck 703 melts and breaks after the discharge ends. At this time, the power resistor 7 acts as the fuse of the protection circuit. The arc generated by the melting of the power resistor 7 is extinguished by the arc-extinguishing medium, which plays the role of circuit protection.

[0082] In some other embodiments, see Figure 7 The second cavity is located on one side of the first cavity. A protruding columnar structure is provided on the base 8, extending into the second cavity. The power resistor 7 has two parallel, spaced-apart connection ends. The power resistor 7 is located on the protruding columnar structure of the base 8 within the second cavity. One connection end of the power resistor 7 is pressed against the second conductor 5, while the other connection end passes through the base 8 and is located outside the base 8, serving as one of the conductive terminals of the excitation closure device. In this embodiment, the power resistor 7 is a wire-wound power resistor, a film power resistor, or a solid ceramic resistor.

[0083] exist Figure 7 Based on this, a series connection can be made on the first conductor 4 and the second conductor 5 respectively, such as Figure 7 The power resistor 7 shown is referenced. Figure 8 The first conductor and the second conductor are respectively pressed between one of the connection terminals of a power resistor 7 and the first housing and the base 8 to achieve conductive connection. The other connection terminal of the power resistor 7 passes through the base 8 and is located outside the base 8, serving as two conductive terminals of the excitation closure.

[0084] In the above embodiments, at least one power resistor can also be connected in series with one of the first conductor or the second conductor. That is, depending on the application, for example, one power resistor can be connected in series with the first conductor, or two or more power resistors can be connected in series with the first conductor. When two or more power resistors are connected in series, the power resistors are all connected in series with the first conductor, but the power resistors can be connected in parallel or in series with each other, depending on the requirements of the application scenario.

[0085] Those skilled in the art will understand that power resistors can also be connected in series with the second conductor alone; one or more resistors can be used, and the configuration is the same as described for the first conductor. Alternatively, power resistors can be connected in series with both the first and second conductors simultaneously. The number of power resistors connected in series with each conductor can be the same or different, but the power resistors on the first and second conductors must be in series (under the condition that both conductors are conducting). When multiple power resistors are connected in series with any single conductor, these resistors can be connected in series, in parallel, or a combination of both. Regardless of whether power resistors are connected in series with the first conductor, the second conductor, or both conductors, the power resistors cannot be connected across the first and second conductors. For example, each power resistor can be connected in series between the first conductor and a terminal closer to the first conductor, or between the second conductor and a terminal closer to the second conductor, or between the first conductor and a terminal closer to the first conductor, or between the second conductor and a terminal closer to the second conductor. The first conductor and the second conductor are connected after the excitation closure is activated, and the first conductor, the second conductor and the power circuit are connected in series.

[0086] like Figure 7 and Figure 8 The working principle of the excitation closure is the same as that of the power resistor fuse, except that the power resistor fuse function is the same. Figure 1 , Figure 7 and Figure 8 The power resistor does not have a fuse function. An additional fuse can be added. Figure 7 and Figure 8 The excitation closure has a fuse function.

[0087] When there are multiple power resistors 7, they can be arranged around the outside of the first conductor and the second conductor.

[0088] exist Figure 1 In this embodiment, the power resistor has a ring-shaped, wavy structure. In some embodiments, the power resistor has a helical filament structure and a helical sheet structure, and the helical cross-section can be circular, square, quadrilateral, or polygonal, etc., and the power resistor material is a conductive material. See also Figure 9 The power resistor 7 has a spiral filament structure with a circular cross-section. (See attached image.) Figure 10 The power resistor 7 has a spiral filament structure, and its cross-section is either square or quadrilateral. (See also...) Figure 9 , Figure 10 , Figure 11 and Figure 12When the power resistor 7 has a spiral filament structure or a spiral sheet structure, the base 8 has a cap-shaped structure. The base 8 is fitted onto the outer wall of the first housing, forming a second cavity between the outer peripheral wall of the first housing and the base 8. A spiral groove is formed on the outer surface of the first housing in the second cavity. The spiral power resistor 7 is fitted onto the spiral groove on the outer wall of the first housing in the second cavity, and the spiral groove provides support and positional definition for the power resistor 7. One end of the power resistor 7 is electrically connected to the second conductor 5. A conductive terminal 11 is provided on the base 8 near the first conductor 4. One end of the conductive terminal 11 passes through the base 8 and is electrically connected to the power resistor 7, while the other end passes through the base 8 and is located outside the base 8 as one of the conductive terminals of the excitation closure device.

[0089] See Figure 13 ,exist Figure 10 and Figure 11 Based on this, no spiral groove is formed on the outer wall of the first housing. The power resistor 7 is wound around the support sleeve 11, and then the support sleeve 11 is fitted into the second cavity. The support sleeve 11 facilitates the installation of the power resistor 7; it can be pre-wound around the support sleeve 11 before being fitted into the second cavity. It should be noted that the end of the power resistor 7 that is electrically connected to the second conductor 5 is located outside the end of the support sleeve 12 for easy crimping with the second conductor 5. The conductive terminal 10 passes through the base 8 and is electrically connected to the power resistor 7 wound around the support sleeve 11. The support sleeve 11 is made of ceramic or plastic.

[0090] In the above embodiments, the piston 3 is made of an insulating material. In some embodiments, the piston material may be a conductive material. See below. Figures 14 to 16 ,exist Figure 1 Based on this, structural changes are made. Piston 3 is made of conductive material and has a cap-like structure, i.e., one end is open and the other end is closed. In this example, the limiting method of piston 3 is as follows: the open end of piston 3 is flanged outward to form a limiting structure, which is supported by a limiting post located in the first cavity on the second housing, and the initial position of piston 3 is limited. Alternatively, other limiting methods can be used: piston 3 is not flanged, and the closed end of piston 3 is limited by a limiting post located in the first cavity on the second housing. The open end of piston 3 is set towards the high-pressure gas release end of excitation source 1, and the closed end of piston 3 is set towards the first conductor 4 and the second conductor 5 in the first cavity. When piston 3 is in non-sealed contact with the first cavity, the high-pressure gas release end of excitation source 1 is located in the open end of piston 3 to ensure that the high-pressure gas released by the excitation source acts on the closed end of piston 3 immediately. When the open end of piston 3 is in sealed contact with the first cavity, the high-pressure gas release end of excitation source 1 can be located outside the open end of piston 3.

[0091] The contact surface between the second housing 6 and the first housing 2 is on the same horizontal plane. One end of the first conductor 4 and the second conductor 5 located in the first cavity is arranged relatively spaced and insulated, and is inclined and bent away from the piston 3, and the bending angle is less than 90 degrees, ensuring that the inclined and bent end has a certain elasticity. The one ends of the first conductor 4 and the second conductor 5 located in the first cavity form a V-shaped structure, and the end with the larger opening of the V-shaped structure is arranged towards the piston 3, and the outer diameter of the piston 3 is greater than the minimum distance between the bent terminals of the first conductor 4 and the second conductor 5 that are hollow in the first cavity, so as to ensure that after the excitation source is triggered, the piston 3 is driven to displace and make interference contact with the first conductor and the second conductor, forming a reliable conductive contact.

[0092] When the excitation source 1 releases high-pressure gas as the driving force according to the received trigger signal, drives the piston 3 to overcome the limit of the limit column and displace, and enters between the first conductor 4 and the second conductor 5 in the first cavity, the piston 3 makes interference contact with the inclined and bent ends of the first conductor 4 and the second conductor 5, and the first conductor 4 and the second conductor 5 are conducted through the conductive piston 3.

[0093] Different from the above embodiments, in some embodiments, considering that the power resistor generates serious heat after setting the neck, correspondingly, the heat dissipation requirement for the housing is increased. Therefore, the neck may not be set on the power resistor, and the fuse structure 14 is added, so as to achieve circuit protection through the fusing function and improve safety.

[0094] See Figure 17 , the second cavity of the first housing is arranged on one side of the first cavity, the power resistor 7 is located at the top in the second cavity, and the isolation and sealing structure 13 is arranged in the second cavity to form a support and relative sealing effect on the power resistor 7. The part of the second cavity that accommodates the power resistor 7 between the isolation and sealing structure 13 and the top of the second cavity can also be filled with heat-resistant and heat-dissipating media, such as quartz sand, aluminum oxide, ceramic powder, refractory mud, etc. A base 15 is arranged at the opening end of the second cavity, and the fuse structure 14 is accommodated in the part of the second cavity between the isolation and sealing structure 13 and the base 15, and the base 15 forms a support and relative sealing effect on the fuse structure 14. The power resistor 7 and the fuse structure 14 are separated by the isolation and sealing structure 13, so that the two are located in independent spaces.

[0095] In Figure 17 , the power resistor 7 has a non-annular wavy flat plate structure in the shape of a plurality of connected "ji" characters, and no neck is provided thereon. The two ends of the power resistor are connection ends respectively. One connection end passes through the isolation and sealing structure 13 and is crimped or welded to the second conductor 5, and the other connection end passes through the isolation and sealing structure 13 and is crimped or welded to one connection end of the fuse structure 14. The other connection end of the fuse structure passes through the base 15 and is located outside the base 15 as one of the conductive terminals of the excitation switch.

[0096] exist Figure 17 In one embodiment, a fuse structure is directly connected in series in the excitation closure for circuit protection. In other embodiments, a molten element can be connected in series on the first or second conductor, and an arc-extinguishing medium can be filled around the molten element to form a fuse structure.

[0097] The power resistor in this embodiment can also be replaced with a commercially available power resistor, such as a wire-wound power resistor, a film power resistor, or a solid ceramic resistor.

[0098] The power resistor in this embodiment can also be replaced with the annular wave-shaped power resistor or the spiral power resistor of Embodiment 1.

Claims

1. An excitation closure device with an integrated power resistor, characterized in that, The device includes a housing and an excitation source, a piston, a first conductor and a second conductor that are insulated from each other, wherein at least one power resistor is connected in series with one or both of the first conductor and the second conductor, and the first conductor and the second conductor remain insulated from each other after being connected in series with the power resistor; the excitation source can act according to a received trigger signal, release high-pressure gas as a driving force to drive the piston to move, so that the first conductor and the second conductor make contact and conduction, and so that the power resistor is connected in series in the circuit where the first conductor and the second conductor are conducting.

2. The excitation closure device according to claim 1, characterized in that, The power resistor has a wavy or spiral structure.

3. The excitation closure device according to claim 2, characterized in that, When the power resistor has a wavy structure, it is a ring-shaped wavy structure, a polygonal wavy structure, or a non-ring-shaped wavy structure; when the power resistor has a spiral structure, it is a spiral filament structure or a spiral sheet structure.

4. The excitation closure device according to claim 3, characterized in that, When the power resistor is a closed-loop wavy structure, one side of the power resistor relative to the center is electrically connected to the first conductor or the second conductor, and the other side is electrically connected to one of the conductive terminals of the excitation closure, or connected to the fuse structure, or passes through the housing to form one of the conductive terminals of the excitation closure; when the power resistor is an open-loop wavy structure, a non-loop wavy structure, a spiral filament structure, or a spiral sheet structure, one end of the power resistor is electrically connected to the first conductor or the second conductor, and the other end is electrically connected to one of the conductive terminals of the excitation closure, or connected to the fuse structure, or passes through the housing to form one of the conductive terminals of the excitation closure; the end of the first conductor and / or the second conductor not connected in series with the power resistor passes through the housing to form another conductive terminal of the excitation closure; when the first conductor and the second conductor are connected, a series relationship is formed between the power resistor, the first conductor, the second conductor, and the fuse structure.

5. The excitation closure device according to claim 4, characterized in that, The power resistor, the first conductor, the second conductor, and the fuse structure are connected to each other by welding or crimping.

6. The excitation closure device according to claim 3, characterized in that, When the power resistor has a ring-shaped wave structure, a polygonal wave structure, a spiral filament structure, or a spiral sheet structure, the power resistor is located in the housing on the outer periphery of the piston displacement path.

7. The excitation closure device according to claim 1, characterized in that, The first conductor and the second conductor located within the housing are offset and insulated at their closest ends, and are respectively located on the displacement path of the piston; when the piston is displaced, the piston drives one end of the first conductor to move toward one end of the second conductor, and makes one end of the first conductor make conductive contact with one end of the second conductor.

8. The excitation closure device according to claim 7, characterized in that, When the first conductor and the second conductor located within the housing are offset and insulated at their closest ends, the first conductor within the housing is configured as a U- or V-shaped elastic structure, and one end of the second conductor is configured as a notch structure. The notch structure is formed by elastic bending at an angle of less than 90° relative to the two sides. When the piston drives the end of the first conductor configured as a U- or V-shaped elastic structure to move toward the end of the second conductor configured with the notch structure, the U- or V-shaped elastic structure is engaged at the notch structure, making the first conductor and the second conductor conductive.

9. The excitation closure device according to claim 1, characterized in that, The first conductor and the second conductor are insulated from each other at their closest ends, and the opposite ends of the first conductor and the second conductor are respectively located on the displacement path of the piston; the piston is made of conductive material, and when the piston is displaced, the piston can be displaced between the opposite ends of the first conductor and the second conductor, and make conductive contact with the first conductor and the second conductor respectively, so that the first conductor and the second conductor are connected.

10. The excitation closure device according to claim 9, characterized in that, When the ends of the first conductor and the second conductor are insulated from each other, the opposite ends of the first conductor and the second conductor are bent and tilted away from the piston. The piston has a cap-shaped structure with one end open and the other end closed, and the open end of the piston is oriented towards the excitation source.

11. The excitation closure device according to claim 1, characterized in that, The excitation closure includes at least one of the following structures, such that the conductor circuit consisting of the first conductor, the power resistor, and the second conductor connected in series can be melted after the excitation closure is closed: The power resistor has a fusible area; or... A fuse structure is connected in series in the circuit formed by the first conductor, the second conductor, and the power resistor, or a fusible element is connected in series inside the excitation closure to form a fuse structure, or a fusible component is connected in series.

12. The excitation closure device according to claim 11, characterized in that, The fusible region on the power resistor is a narrow neck, or the melting point of the material of the fusible region is lower than the melting point of the power resistor material outside the fusible region.

13. The excitation closure device according to claim 11, characterized in that, The fusible region and the melt are respectively located in the arc-extinguishing medium.

14. The excitation closure device according to any one of claims 1 to 13, characterized in that, The housing includes a first housing and a second housing joined together, the first housing and the second housing having a communicating first cavity. The excitation source and the piston are disposed in the first cavity of the first housing. The first conductor and the second conductor are both disposed in the second housing, or both disposed between the first housing and the second housing, or one of the first conductor and the second conductor is disposed in the second housing and the other is disposed between the first housing and the second housing. The ends of the first conductor and the second conductor that are close to each other and insulated are respectively located in the first cavity and are located on the piston displacement path. At least one second cavity is disposed outside the first cavity, and the power resistor and the fuse structure are respectively disposed in the second cavity.

15. The excitation closure device according to claim 14, characterized in that, When the power resistor has a ring-shaped or spiral structure, the second cavity is arranged around the first cavity to form a ring-shaped structure.

16. The excitation closure device according to claim 14, characterized in that, When the power resistor is a spiral filament structure or a spiral sheet structure, a spiral groove is formed on the side wall of the second cavity near the first cavity. The power resistor is nested in the spiral groove, and one end that is conductively connected to the first conductor or the second conductor is located outside the spiral groove.

17. The excitation closure device according to claim 14, characterized in that, When the power resistor has a spiral filament structure or a spiral sheet structure, a support sleeve is provided in the second cavity, and the power resistor is wound around the support sleeve.

18. The excitation closure device according to claim 14, characterized in that, The second cavity containing the power resistor is filled with an arc-extinguishing medium.

19. The excitation closure device according to claim 18, characterized in that, When the power resistor is connected in series with the fuse structure and the power resistor and the fuse structure are located in the same second cavity, the power resistor and the fuse structure are separated by a sealed isolation method.

20. The excitation closure device according to claim 14, characterized in that, It also includes a base located at one end of the first housing where the second housing is located. The base encloses the second cavity and provides support for the power resistor or fuse structure housed in the second cavity. Alternatively, the base encloses the second cavity and provides support for the power resistor or fuse structure housed in the second cavity while simultaneously providing support and positioning for the second housing.

21. The excitation closure device according to any one of claims 1 to 13, characterized in that, The power resistor is a wire-wound power resistor, a film power resistor, or a solid ceramic resistor.

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