An excitation protection device

Abstract

This invention relates to the fields of power control and electric vehicles, and discloses an excitation protection device, including a housing, an excitation source disposed within the housing, a piston, and a conductive plate. The piston, driven by the excitation source, can disconnect the conductive plate. The piston is integrally formed with the housing, and after separating from the housing under the drive of the excitation source, it can disconnect the conductive plate. The excitation protection device of this invention, with the piston and housing integrally formed, reduces the number of parts, simplifies the assembly process, improves assembly efficiency, reduces production costs, avoids the risk of missing pistons, improves product yield, and enhances the reliability of circuit protection.

Description

Technical Field

[0001] This invention relates to the fields of power control and electric vehicles, and in particular to an excitation protection device in which the piston and housing are integrally formed. Background Technology

[0002] Currently, in addition to traditional thermal fuses, electric vehicle battery pack protection devices have developed a structure that quickly cuts off the circuit, namely an excitation protection device, which is gradually expanding its application range. This is mainly to overcome the shortcomings of traditional fuses, such as high heat generation, high power consumption, large size and weight, limited resistance to current surges, long breaking time, and uncontrolled breaking process.

[0003] The excitation protection device generally consists of a housing, within which an excitation source, a piston, and a conductive element are sequentially arranged. A pre-break is provided on the conductive element. Its working principle is as follows: The excitation protection device is connected in series in the protection circuit via the conductive element. When a fault occurs in the protection circuit and disconnection is required, the control circuit triggers the excitation source of the excitation protection device. The triggering of the excitation source generates high-pressure gas, which pushes the piston to break the pre-break on the conductive element, forming a physical break on the conductive element, thereby achieving the purpose of quickly disconnecting the circuit.

[0004] The key operating components of the aforementioned excitation and protection device are the piston and the conductive plate. The conductive plate is generally installed inside the housing, and the piston is completely located inside the housing. It is not easy to identify if a piston is missing during assembly, or even if a missing piston is detected by visual recognition scanning, it needs to be reworked and reassembled, which greatly increases the cost. The problem of missing pistons reduces the reliability of this excitation and protection device. Summary of the Invention

[0005] The purpose of this invention is to provide an excitation and protection device in which the piston and housing are integrally formed. During operation, the piston is driven to separate from the housing and then disconnects the conductive plate. This excitation and protection device, with the piston and housing integrally formed, reduces the number of parts, simplifies the assembly process, lowers costs, avoids the risk of missing pistons, and improves the reliability of the protection circuit.

[0006] To achieve the above-mentioned technical objectives, the present invention provides an excitation protection device, comprising a housing, an excitation source disposed within the housing, a piston, and a conductive plate, wherein the piston can disconnect the conductive plate under the drive of the excitation source; characterized in that the piston is integrally formed with the housing, and the piston can disconnect the conductive plate after separating from the housing under the drive of the excitation source.

[0007] Preferably, an observation hole is provided on the housing wall. When the piston is in the initial position, the impact end of the piston tail is within the field of view of the observation hole. When the piston moves, the piston head is within the field of view of the observation hole.

[0008] Preferably, a baffle is provided in front of the piston displacement, and a gap is maintained in the baffle or between the baffle and the inner wall of the housing for the piston tail to pass through.

[0009] Preferably, it includes two opposing baffles, with a gap between the two baffles for the piston tail to pass through.

[0010] Preferably, the two baffles are L-shaped and have a gap between them and the inner wall of the housing, with the piston located between the two baffles; the conductive plate is inserted into the gap between the baffles and the inner wall of the housing, and the conductive terminals of the conductive plate are located outside the housing.

[0011] Preferably, the housing is provided with a receiving cavity for accommodating the disconnected portion of the conductive plate.

[0012] Preferably, an installation port is provided on one side of the housing, and the installation port is closed by an outer cover.

[0013] Preferably, the housing includes a first housing and a second housing that are spliced ​​together. The excitation source is located in the first housing, and the piston, baffle, conductive plate and accommodating cavity are located in the second housing respectively. The mounting port is opened on one side of the second housing, and the outer cover is fixedly connected to the first housing and the second housing to close the mounting port.

[0014] Preferably, the first housing has a through cavity, and both ends of the first housing extend outward to form annular structures; the excitation source is disposed in the cavity of the first housing, and a receiving groove is formed between the end of the excitation source near the piston and the first housing; the piston head protrudes from the end face of the second housing in an annular structure, and a limiting groove is formed between the piston and the second housing, with the bottom of the limiting groove being the integral connection point between the piston and the second housing; when the first housing and the second housing are assembled, the annular structure of the first housing is engaged in the limiting groove of the second housing to seal the contact surface, and the piston head is engaged in the receiving groove formed by the first housing and the excitation source.

[0015] Preferably, a sealing element is provided at the bottom of the limiting groove.

[0016] Preferably, the second housing and the first housing are respectively provided with matching positioning grooves or positioning blocks at the contact end of the second housing and the first housing. When the first housing and the second housing are assembled, the positioning block is inserted into the positioning groove.

[0017] Preferably, connection and fixing holes are respectively provided on the positioning groove and positioning block, and on the bottom of the second housing; the outer cover is fixedly connected to the first housing and the second housing by one or more of the fixing posts, pins, rivets or screws passing through the connection and fixing holes, thereby sealing the installation opening.

[0018] Preferably, a fixing post or pin is integrally formed on the outer cover, and one end of the pin is forked.

[0019] Preferably, the outer cover is provided with several reinforcing ribs, wherein a groove is formed between two adjacent reinforcing ribs, and one side of the piston is disposed in the groove and can be displaced along the groove.

[0020] Preferably, a notch is provided on the outer cover, and a limiting protrusion is provided on one side of the second housing relative to the notch of the outer cover. When the outer cover is assembled on the housing, the limiting protrusion is located in the notch of the outer cover.

[0021] The excitation protection device of this invention features a piston integrally formed with the housing, and a conductive plate with a three-dimensional geometric structure. The addition of an integrally formed baffle enhances the constraint on the conductive plate, limits piston displacement, and increases creepage distance, thereby improving installation reliability. An observation window allows for real-time monitoring of the piston's state, confirming whether the excitation protection device has malfunctioned. The addition of positioning grooves and blocks at the contact surface ensures a sealed contact between the first and second housings, with reliable relative positioning. The inclusion of integrally formed fixing posts and pins on the outer cover eliminates the need for additional screws or other components for outer cover fixation. This excitation protection device reduces the number of components, simplifies the assembly process, improves assembly efficiency, lowers production costs, avoids the risk of missing pistons, and improves product yield and circuit protection reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the excitation protection device of the present invention.

[0023] Figure 2 yes Figure 1 A schematic diagram of the explosion structure.

[0024] Figure 3 This is a schematic diagram of the first shell structure.

[0025] Figure 4 This is a structural schematic diagram of the first shell from another angle.

[0026] Figure 5 This is a cross-sectional structural diagram of the excitation protection device when the excitation source is in interference fit.

[0027] Figure 6 This is a cross-sectional structural diagram of the excitation protection device during injection molding.

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

[0029] Figure 8 This is a structural schematic diagram of the second housing mounting port side.

[0030] Figure 9 This is a schematic diagram of the outer side of the second housing mounting port on the opposite side.

[0031] Figure 10 This is a schematic diagram of the outer side of the excitation protection device relative to the outer cover before the piston moves.

[0032] Figure 11 This is a schematic diagram of the outer side structure of the excitation protection device relative to the outer cover after the piston moves.

[0033] Figure 12 This is a schematic diagram of the conductive plate structure.

[0034] Figure 13 This is a schematic diagram of the outer cover structure.

[0035] Figure 14 This is a schematic diagram of another structure for the outer cover.

[0036] Figure 15 This is a schematic diagram of another structure for the outer cover.

[0037] Figure 16 This is a schematic diagram of another structure for the outer cover.

[0038] Figure 17 This is a cross-sectional view of an excitation protection device equipped with a seal. Detailed Implementation

[0039] The excitation protection device of the present invention, such as Figure 1 , Figure 2 The excitation protection device includes a first housing 1, an excitation source 2, a second housing 3, a conductive plate 4, and an outer cover 5. The first housing 1, the second housing 3, and the outer cover 5 constitute the housing of the excitation protection device, and the conductive plate 4 is inserted into the housing. Wherein:

[0040] See Figures 3-6 The first housing 1 has a through cavity inside. Both ends of the cavity extend outward from both ends of the first housing body to form annular structures. One end of the cavity is the top 101, and the other end is the bottom 104. The top 101 and the bottom 104 of the cavity protrude outward from the first housing body. Ribs 102 are provided in the cavity.

[0041] The excitation source 2 is located in the cavity of the first housing 1. The inner wall shape of the cavity in contact with the excitation source 2 has a limiting function; that is, the end at the top 101 of the cavity has a contracting surface structure, restricting the excitation source 2 from entering the top 101 of the cavity. The excitation source 2 is inserted into the cavity of the first housing 1 from the bottom 104 end. The excitation source 2 is interference-fitted with the rib 102 in the cavity, fixing the excitation source 2 in the cavity of the first housing 1. The trigger connector of the excitation source 2 is located in the top 101 of the cavity. The excitation source 2 can be limited and fixed in the cavity of the first housing 1 by interference fit, adhesive bonding, or injection molding. This example uses interference fit. See [link to documentation]. Figure 5Excitation source 2 can also be integrally formed with the shell through injection molding, see [link / reference] Figure 6 .

[0042] Multiple positioning grooves 103 are formed on the outer periphery of the first housing 1 at the bottom 104 of the cavity for assembly and positioning with the second housing 3. A connecting fixing hole 105 is provided on the first housing 1 for the fixing post 501 of the outer cover 5 to pass through, and the connecting fixing hole 105 passes through the side wall of the positioning groove 103. A positioning notch 106 for positioning the outer cover 5 is provided on the side of the first housing 1 at one end of the connecting fixing hole 105.

[0043] Second shell 3, see Figure 5 , Figure 7 , Figure 8 and Figure 9 The second housing 3 is provided with a positioning block 301, a piston 302, a baffle 303, and a receiving cavity 304 for accommodating the disconnected portion after the conductive plate is disconnected. A cavity is formed within the second housing 3, which does not penetrate the bottom of the second housing 3. One side of the second housing 3 is configured as a mounting port, which communicates with the cavity; the other sides of the second housing 3 opposite the mounting port are closed sides. The piston 302 is located within the cavity and is integrally formed with the inner wall of the cavity in the second housing 3 via a connection 3023.

[0044] The piston 302 consists of a piston head 3021 and a piston tail 3022. The top of the piston head 3021 extends beyond the top end face of the main body of the second housing 3. A positioning block 301 is located outside the piston head 3021, and a limiting groove is formed between the piston head 3021 and the positioning block 301 in the second housing. The limiting groove is positioned opposite to the bottom 104 of the cavity of the first housing 1, and their shapes match. The bottom of the limiting groove is the integral connection point 3023 between the piston and the second housing. During the assembly of the first and second housings, a sealing element is provided at the bottom of the limiting groove. The bottom 104 of the cavity is inserted into the limiting groove, pressing the sealing element to form a seal on the contact surface of the first and second housings.

[0045] The connection 3023 is also the junction of the piston head 3021 and the piston tail 3022. The connection 3023 is designed to be thin and weak, so that the piston displacement can be driven after the excitation source is triggered to destroy the junction, thereby separating the piston from the second housing. However, the strength of the connection design must ensure that the piston will not separate from the second housing under normal impact and vibration conditions.

[0046] A sealing element 6, such as a sealing ring, can also be provided at the bottom of the limiting groove. Figure 17This achieves a seal at the contact surface between the first and second housings. When the piston is disengaged from the integral connection between it and the second housing, the seal 6 prevents high-pressure gas from leaking from the contact surface where the first and second housings are assembled, and also prevents high-pressure gas from leaking into the conductive plate chamber, thus ensuring insulation between the excitation source drive circuit and the conductive plate circuit.

[0047] The piston head 3021 is cylindrical with a groove at the top for concentrating force. During assembly of the second and first housings, the top of the piston head 302 extends into the cavity of the first housing 1, positioning one end of the excitation source 2 within the groove of the piston head. Simultaneously, the bottom 104 of the first housing cavity extends into the positioning groove between the piston head and the positioning block of the second housing 3, forming a nested sealing structure. This further positions the piston and seals the contact surfaces of the first and second housings 1 and 3. The piston head can also be a triangular prism, a quadrangular prism, or other polyprismatic shapes. The piston tail 3022 has a blade-like structure, with the lowest point being a sharp blade serving as the impact end. This allows for concentrated force during movement, making it easier to cut the conductive plate.

[0048] The positioning block 301 corresponds to the positioning groove 103 of the first housing 1 and is used for positioning during assembly with the first housing. In this example, four positioning blocks are provided, and correspondingly, four positioning grooves 103 are also provided in the first housing 1. When the first housing and the second housing are assembled, the positioning block 301 extends into the positioning groove 103 to achieve positioning. A connecting fixing hole 3011 is also provided on the positioning block 301. The connecting fixing hole 3011 corresponds to the connecting fixing hole 105 of the first housing 1. When the first housing and the second housing are assembled, the connecting fixing hole 3011 and the connecting fixing hole 105 of the first housing 1 form a through hole for the fixing post 501 of the outer cover 5 to be inserted and fixed.

[0049] Below the bottom 3023 of the limiting groove and on opposite sides of the piston tail 3022, baffles 303 are integrally formed. The baffles 303 have an L-shaped structure, forming a gap between the baffle and the inner wall of the second housing 3 for the insertion of the conductive plate, and cooperating with the inner wall to limit the conductive plate. One lateral end of the baffle is located in front of the piston 302's displacement, limiting the piston's termination position. The lateral ends of the two baffles 303 are spaced apart, forming a gap between the two baffles for the piston tail 3022 to pass through. By pressing the conductive plate with the baffles, it can prevent the disconnected side of the conductive plate from lifting due to impact force after the piston disconnects; simultaneously, the baffles isolate the electric arc and increase the creepage distance.

[0050] When the piston reaches its dead center, baffle 303 limits the piston head 3021, and the piston tail 3022 passes through the gap formed between the two baffles, cutting off the conductive plate. Compared to directly using the conductive plate plane as the limit for the piston's dead center, setting a baffle between the piston and the conductive plate reduces the impact of the piston on the lower part of the housing, and the baffle also plays a certain role in absorbing energy. In addition, setting a baffle between the piston and the conductive plate can also isolate the conductive plate from the excitation source, improving the insulation between the conductive plate circuit and the excitation source triggering circuit.

[0051] Two baffles can also form a single baffle, but a gap must be left between the baffle and the inner wall of the housing, or within the baffle, for the piston tail to pass through.

[0052] Limiting protrusions 3041 are respectively provided on the inner wall of the second housing 3 outside the baffle 303. Observation holes 305 and 306 are provided on the side wall of the second housing opposite the mounting opening. The observation holes are designed to observe the movement state of the piston 302 while also facilitating machining. The movement state of the piston 302 can also be observed through observation hole 306. Before operation, such as... Figure 10 Through observation hole 306, the piston tail 3022 can be seen. After action, as... Figure 11 Because of piston displacement, only the piston head 3021 can be seen through the observation hole 306. Therefore, by combining the observation hole 306 and the piston 302, it is possible to indicate whether this excitation protection device has been activated. A connection fixing hole 3042 is also provided at one end of the bottom of the second housing 3 for the fixing post 501 on the outer cover to pass through. A limiting protrusion 308 is provided on one side of the mounting opening of the second housing, and the side of the limiting protrusion 308 is inclined.

[0053] The conductive plate 4 is designed with a multi-bent three-dimensional geometric structure, which helps save space and facilitates positioning. (See attached image) Figure 12 The conductive plate 4 includes a U-shaped conductive plate body and conductive terminals 404. The conductive terminals 404 are located on both sides of the conductive plate body, and the two side walls of the U-shaped conductive plate body are bent at a 90-degree angle. The shape of the conductive plate body matches the shape of the gap between the baffle 303 and the inner wall of the second housing. Limiting protrusions 403 are respectively provided on the outer side of the two side walls of the conductive plate body, and the limiting protrusions 403 can be formed by stamping.

[0054] A weak point 401 is pre-set at the position of the conductive plate body directly opposite the tail end of the piston 302. The weak point 401 is a structure designed to reduce strength. Specifically, the weak point 401 is a "V"-shaped groove structure that runs through the width of the conductive plate on one side of the conductive plate body. Notches are set at both ends of the "V"-shaped groove to make it easier for the piston's impact end to cut the conductive plate through the weak point 401. A rotating notch 402 is also pre-set on one side of the weak point 401. This ensures that after the conductive plate is cut, the cut portion moves along a preset trajectory with the rotating notch as the center. In this example, the rotating notch is specifically a rectangular groove that runs through the width of the conductive plate.

[0055] During assembly, when inserting the conductive plate body into the gap between the baffle 303 and the inner wall of the second housing through the mounting port, refer to... Figure 5 and Figure 6 The limiting protrusion 403 on the conductive plate overcomes the limiting protrusion 3041 and enters the gap between the limiting protrusion 3041 and the other side wall. Through the limiting protrusion 3041's limitation on the limiting protrusion 403 on the conductive plate, the baffle, and the inner wall of the second housing's limitation on the conductive plate, the conductive plate is positioned and installed, preventing it from shaking or coming out of the second housing. After the conductive plate is installed in place, the weak break 401 on the conductive plate is located in the gap formed between the two baffles 303, directly opposite the impact end of the piston tail 3022; the conductive terminals 404 are located on both sides of the second housing 3. The accommodating cavity 304 is located between the conductive plate and the bottom of the second housing. When the conductive plate breaks, the broken part can move along the rotating notch into the accommodating cavity 304.

[0056] After the first housing, second housing, excitation source, conductive plate, etc. are installed, refer to... Figure 1 and Figure 2 The outer cover 5, together with the first and second housings, forms a relatively sealed housing. The assembly of the outer cover with the first and second housings can be achieved using methods such as hot-melt or adhesive bonding of fixing posts, pins, rivets, screws, or ultrasonic welding. For the specific structure of the outer cover 5, please refer to [link to relevant documentation]. Figures 13-16 .

[0057] One structure of the outer cover 5, such as Figure 13On the contact surface where the outer cover 5 is assembled with the first and second housings, four fixing posts 501 are provided at the positions of the connecting fixing holes. The cross-section of the fixing posts can be circular, square, plum blossom-shaped, or other polygonal. During assembly, the fixing posts 501 pass through the connecting fixing holes of the first and second housings and are then heat-fused at the tail end to achieve overall connection and fixation, or adhesive can be applied to the surface of the fixing posts and the connecting fixing holes before assembly to achieve adhesive fixation. A notch 506 is provided on the outer cover 5 at the position of the limiting protrusion 308 of the second housing. The notch 506 has a corresponding inclined structure at the contact point with the side of the limiting protrusion 308. After the outer cover is assembled, the notch 506 covers at least three sides of the limiting protrusion 308 and fits against it, further realizing the positioning of the outer cover. Through the positioning and cooperation of the notch 506 on the outer cover and the limiting protrusion 308 on the second housing, the impact force caused by left and right shaking on the fixing posts, pins, rivets, screws and other fasteners of the outer cover can be reduced.

[0058] Another structure of the outer cover 5, such as Figure 14 Four pins 501 are set on the outer cover 5. The ends of the pins are forked. During assembly, a tool is used to clamp the forked ends to close them. After the pins 501 pass smoothly through the connection and fixing holes of the first and second housings, the forked ends naturally separate and will not retract, thus achieving the overall connection and fixing. Glue can also be applied to the non-forked parts of the pins.

[0059] Another structure of the outer cover 5, such as Figure 15 Two pins on the outer cover are removed to form two connecting and fixing holes 503 and two pins 501. The connection method of pins 501 is the same as above. The connecting and fixing holes 503 correspond to the connecting and fixing points on the upper and lower parts. The overall connection and fixing is achieved by rivets or screws.

[0060] Another structure of the outer cover 5, such as Figure 16 The outer cover is provided with connection and fixing holes corresponding to the connection and fixing holes of the first shell and the second shell, and the overall connection and fixing is achieved by rivets or screws.

[0061] The outer cover is relatively thinner than the first and second housings, so several sets of reinforcing ribs 502 are provided on the contact surface between the outer cover and the first and second housings. After the outer cover is assembled, a groove is formed between two reinforcing ribs 502. One side of the piston tail is located in the groove. The groove limits the piston to ensure that it can move vertically along the groove structure after being driven by the excitation source, without deflecting the direction.

[0062] A limiting protrusion 505 is also provided on the contact surface of the outer cover. After the outer cover is assembled, the limiting protrusion 505 is locked in the gap between the baffle where the conductive plate is located and the inner wall of the second housing to limit the position of the outer cover.

[0063] Assembly process:

[0064] First, the excitation source 2 is inserted into the first housing 1 from one end of the cavity bottom 104, so that the excitation source 2 is interference-fitted with the cavity of the first housing 1, and the trigger connector of the excitation source 2 is located in the top 101 of the cavity; then, the first housing 1 and the second housing 3 are assembled together, so that one end of the excitation source 2 is located in the top groove of the piston head, the cavity bottom 104 of the first housing is engaged in the limiting groove of the second housing, and the positioning block 301 of the second housing 3 is engaged in the positioning groove 103 of the first housing 1, so that the contact surface of the first housing and the second housing is sealed; then, the conductive plate body is inserted into the gap between the baffle 303 and the inner wall of the second housing 3, so that the limiting protrusion 403 and the limiting protrusion 3041 are engaged to position the conductive plate; then, the outer cover 5 is covered, and the fixing post 501 of the outer cover is inserted into the upper and lower combinable connection fixing hole for fixing.

[0065] Working principle:

[0066] The excitation source is triggered to generate high-pressure gas, which provides driving force for the piston. Under the action of high-pressure gas, the piston overcomes the connection point that is integrally connected with the shell, causing it to separate from the shell and drive the piston to move. The piston breaks the conductive plate at the weak point 401. The tail of the piston passes through the gap between the two baffles, driving the broken part of the conductive plate to rotate along the rotating notch 402 and enter the accommodating cavity 304. When the piston moves to the dead point, the baffle limits the piston head and stops its movement.

Claims

1. An excitation protection device, comprising a housing, an excitation source disposed within the housing, a piston, and a conductive plate, wherein the piston can disconnect the conductive plate under the drive of the excitation source; characterized in that, The piston is integrally formed with the housing, and the conductive plate can be disconnected after the piston is separated from the housing under the drive of the excitation source; The shell includes a first shell and a second shell that are spliced ​​together, with the end of the first shell facing the second shell extending outward to form a ring structure; The excitation source is located inside the first housing, and a receiving groove is formed between the end of the excitation source near the piston and the first housing. The piston head has an annular structure protruding from the end face of the second housing. A limiting groove is formed between the piston and the second housing. The bottom of the limiting groove is where the piston and the second housing are integrally connected. When the first housing and the second housing are assembled, the annular structure of the first housing is engaged in the limiting groove of the second housing, and the piston head is engaged in the receiving groove formed by the first housing and the excitation source to form a nested sealing structure.

2. The excitation protection device according to claim 1, characterized in that, An observation hole is provided on the housing wall. When the piston is in the initial position, the impact end of the piston tail is within the field of view of the observation hole. When the piston moves, the piston head is within the field of view of the observation hole.

3. The excitation protection device according to claim 1, characterized in that, An installation port is provided on one side of the housing, and the installation port is closed by an outer cover; a baffle is provided in front of the piston displacement, and a gap is maintained in the baffle or between the baffle and the inner wall of the housing for the piston tail to pass through; a gap is maintained between the baffle and the inner wall of the housing; the conductive plate includes a U-shaped conductive plate body and conductive terminals, the shape of the conductive plate body matches the shape of the gap between the baffle and the inner wall of the housing, the conductive plate body is inserted into the gap between the baffle and the inner wall of the housing, and the conductive terminals are located outside the housing; first limiting protrusions are respectively provided on the outer sides of the two side walls of the conductive plate body, and second limiting protrusions are respectively provided on the inner wall of the housing outside the baffle; During assembly, when the conductive plate body is inserted into the gap between the baffle and the inner wall of the housing through the mounting port, the first limiting protrusion overcomes the limitation of the second limiting protrusion and enters the gap between the second limiting protrusion and the other side wall of the housing. The positioning of the conductive plate body is achieved by the second limiting protrusion limiting the first limiting protrusion.

4. The excitation protection device according to claim 3, characterized in that, It includes two opposing baffles, with a gap between the two baffles for the piston tail to pass through.

5. The excitation protection device according to claim 4, characterized in that, The two baffles are L-shaped, and the piston is located between the two baffles.

6. The excitation protection device according to claim 1, characterized in that, The housing is provided with a cavity for accommodating the disconnected part of the conductive plate.

7. The excitation protection device according to claim 6, characterized in that, The piston, baffle, conductive plate, and accommodating cavity are located inside the second housing. The mounting port is opened on one side of the second housing, and the outer cover is fixedly connected to the first and second housings to seal the mounting port.

8. The excitation protection device according to claim 1, characterized in that, A sealing element is provided at the bottom of the limiting groove.

9. The excitation protection device according to claim 1, characterized in that, The second housing and the first housing are respectively provided with matching positioning grooves or positioning blocks at the contact end. When the first housing and the second housing are assembled, the positioning block is inserted into the positioning groove.

10. The excitation protection device according to claim 9, characterized in that, Connection and fixing holes are respectively provided on the positioning groove and positioning block, and on the bottom of the second housing; the outer cover is fixedly connected to the first housing and the second housing by one or more of the fixing posts, rivets or screws passing through the connection and fixing holes, thereby sealing the installation opening.

11. The excitation protection device according to claim 10, characterized in that, A fixing post is integrally formed on the outer cover. The fixing post includes a pin, and one end of the pin is forked.

12. The excitation protection device according to claim 10, characterized in that, Several reinforcing ribs are provided on the outer cover, and a sliding groove is formed between two adjacent reinforcing ribs. One side of the piston is set in the sliding groove and can move along the sliding groove.

13. The excitation protection device according to claim 10, characterized in that, A notch is provided on the outer cover, and a limiting protrusion is provided on one side of the second housing relative to the notch of the outer cover. When the outer cover is assembled on the housing, the limiting protrusion is located in the notch of the outer cover.

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