An explosion-proof pressure relief valve

Abstract

The utility model discloses an explosion -proof pressure -relief valve, including valve body and valve cover, one of valve body or valve cover is equipped with corresponding static contact piece and dynamic contact piece, the other of two is equipped with the trigger block of dynamic contact piece adaptation, and still have the pull -down assembly between valve body and valve cover, in the first state, the valve cover is closed on the pressure -relief channel of valve body through pull -down assembly, and trigger block side extrusion dynamic contact piece and static contact piece abutment connection, in the second state, the valve cover is opened on the pressure -relief channel of valve body, and trigger block and dynamic contact piece are separated, and dynamic contact piece elastic reset and static contact piece are separated and abutment and prevent trigger block reset, after explosion -proof pressure -relief valve opens, trigger block and dynamic contact piece are separated, and dynamic contact piece elastic reset and static contact piece are separated and abutment and prevent trigger block reset, effectively avoid valve cover from resetting, when the first state, trigger block side extrusion dynamic contact piece and static contact piece abutment connection, prevent trigger block and dynamic contact piece from separating under the working condition of vibration, avoid false alarm.

Description

Technical Field

[0001] This utility model relates to the field of battery safety technology, specifically to an explosion-proof pressure relief valve. Background Technology

[0002] A battery pack is a battery assembly formed by combining multiple battery cells in series and parallel connections, along with components such as protection circuits and a casing, to create a ready-to-use battery pack. Battery packs are widely used in electric vehicles, consumer electronics, and energy storage systems.

[0003] During use, battery packs may experience thermal runaway due to overcharging, short circuits, high temperatures, or other reasons, potentially leading to fires, explosions, and other safety accidents. Therefore, battery packs require thermal runaway alarm systems to provide users with sufficient time to escape in case of emergencies. The mainstream battery pack thermal runaway monitoring systems in the industry use built-in or external smoke, heat, and combustible gas detectors. However, most of these detectors suffer from unstable thermal runaway alarm functions, sometimes failing to alarm or issuing false alarms, thus posing a safety hazard to the battery pack.

[0004] Currently, explosion-proof valves for installation on the outer shell of battery boxes are available on the market. For example, Chinese utility model patent application number 202122613321.7 discloses an explosion-proof valve, including: a valve body with a stationary contact and a pressure relief channel penetrating the valve body; and a valve that is slidably disposed within the pressure relief channel and controls the opening and closing of the pressure relief channel. The valve has a moving contact, which, when slidably disposed, drives the moving contact to approach and connect with the stationary contact or drives the moving contact away from the stationary contact. This explosion-proof valve can achieve thermal runaway alarm by measuring the resistance value of the warning resistor using a battery management module, which improves the reliability of the alarm function to a certain extent. However, the explosion-proof valve has the following problems during use: when the battery box is subjected to vibration or other shocks, such as in an electric vehicle, the valve will continuously vibrate and slide within the pressure relief channel on the valve body, posing a risk of frequent false alarms. Furthermore, the valve is limited between a fixed bracket inside the pressure relief channel and a limiting part at the lower end of the valve by a pressure-sensitive spring sleeved on its outside. When a slight thermal runaway occurs inside the battery box, the corresponding valve body may burst. Due to the elastic tension of the pressure-sensitive spring, the valve will self-reset when the battery stops supplying power and the temperature drops. This makes it difficult for maintenance personnel to accurately determine whether the explosion-proof valve has experienced overheating runaway and bursting, thus hindering timely repair of minor thermal runaway faults inside the battery box and posing a safety hazard. Therefore, this utility model proposes an explosion-proof pressure relief valve to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide an explosion-proof pressure relief valve. When a thermal runaway fault occurs inside the PACK battery box, the valve cover is compressed by the high-pressure gas inside the box, which pushes it up to open the pressure relief channel on the valve body, causing the explosion-proof pressure relief valve to change from the first state to the second state. After the explosion-proof pressure relief valve is opened, the trigger block separates from the moving contact, and the moving contact elastically resets and separates from the stationary contact, abutting against and preventing the trigger block from resetting, effectively preventing the valve cover from self-resetting. This helps maintenance personnel to promptly detect and troubleshoot faults in the PACK battery, ensuring the safety of PACK battery use. When the explosion-proof pressure relief valve of this invention is in the first state, the trigger block laterally presses the moving contact and the stationary contact together, that is, the trigger block, moving contact, and stationary contact are elastically and tightly connected together, effectively preventing the trigger block and moving contact from separating under vibration conditions, thereby avoiding the explosion-proof pressure relief valve from false alarms.

[0006] To achieve the above objectives, the technical solution of this utility model is to design an explosion-proof pressure relief valve, including a valve body and a valve cover. The valve body has a pressure relief channel extending through both the upper and lower ends. One of the valve body or the valve cover is provided with a corresponding stationary contact and a moving contact. The other of the valve body or the valve cover is provided with a trigger block adapted to the moving contact. A pull-down assembly is also provided between the valve body and the valve cover. The explosion-proof pressure relief valve has a first state and a second state. In the first state, the valve cover closes the pressure relief channel on the valve body through the pull-down assembly, and the trigger block laterally presses the moving contact to abut against the stationary contact. In the second state, the valve cover pushes up to open the pressure relief channel on the valve body, and the trigger block separates from the moving contact. The moving contact elastically resets and separates from the stationary contact, abutting against and preventing the trigger block from resetting.

[0007] This invention discloses an explosion-proof pressure relief valve. When a thermal runaway fault occurs inside the PACK battery box, the valve cover is compressed by the high-pressure gas inside the box, causing it to rise and open the pressure relief channel on the valve body. This changes the explosion-proof pressure relief valve from a first state to a second state. After the explosion-proof pressure relief valve opens, the trigger block separates from the moving contact, and the moving contact elastically resets and separates from the stationary contact, abutting against and preventing the trigger block from resetting. This effectively prevents the valve cover from self-resetting, thus helping maintenance personnel to promptly detect and troubleshoot faults in the PACK battery and ensuring the safety of PACK battery use. When the explosion-proof pressure relief valve is in the first state, the trigger block laterally presses the moving contact and the stationary contact together, i.e., the trigger block, moving contact, and stationary contact are elastically and tightly connected together. This effectively prevents the trigger block from separating from the moving contact under vibration conditions, thereby avoiding false alarms caused by the explosion-proof pressure relief valve.

[0008] The preferred technical solution is that the stationary contact piece and the moving contact piece are connected end to end to form a ring structure, the stationary contact at both ends of the stationary contact piece corresponds to the moving contact at both ends of the moving contact piece, and the trigger block is a ring-shaped eave body that is plugged into and adapted to the ring structure.

[0009] In the first state, the valve cover closes the pressure relief channel on the valve body via the pull-down assembly, and the circumferential eaves are inserted into the circumferential structure to drive the moving contact to abut against the corresponding stationary contact. In the second state, the valve cover is pushed up to open the pressure relief channel on the valve body, and the circumferential eaves are pulled out from the circumferential structure. The moving contact elastically resets and separates from the corresponding stationary contact, abutting against and preventing the circumferential eaves from resetting. The stationary and moving contact pieces are joined end-to-end to form a circumferential structure. The trigger block is a circumferential eaves that is compatible with the circumferential structure. In the first state, the insertion and engagement stability between the circumferential eaves and the circumferential structure is good. In the second state, after the circumferential eaves are pulled out from the circumferential structure, the stability of the moving contact abutting against the circumferential eaves is good, effectively preventing false alarms from occurring in the explosion-proof pressure relief valve.

[0010] A further preferred technical solution is that the stationary contact plate and the moving contact plate are located at the upper end of the valve body, the circumferential eaves are located on the lower end face of the valve cover, the moving contact plate includes moving contact plate one and moving contact plate two, the upper end face of the valve body has an annular groove one with an upward opening, two notches on the left and right sides of the inner circumferential wall of the annular groove one divide the annular groove one into an arc groove one located on the rear side and an arc groove two located on the front side, and the upper end of the pressure relief channel also has a plug groove with a downward opening, and the top of the plug groove has two through holes two corresponding to the middle of the inner side wall of the arc groove two;

[0011] The stationary contact piece is embedded inside the arc-shaped groove one, and the stationary contacts at both ends of the stationary contact piece are correspondingly attached to the outer side walls of both ends of the arc-shaped groove one. The moving contact piece one is embedded at the left end of the arc-shaped groove two, and the moving contact piece two is correspondingly embedded at the right end of the arc-shaped groove two. The moving contact at the left end of the moving contact piece one passes through the notch on the left side of the annular groove one and extends into the pressure relief channel. The moving contact at the right end of the moving contact piece two passes through the notch on the right side of the annular groove one and extends into the pressure relief channel. The plug-in pin at the right end of the moving contact piece one and the plug-in pin at the left end of the moving contact piece two respectively pass through a corresponding through hole two and extend into the plug-in groove. The moving contact piece is designed as a two-section symmetrically embedded at both ends of the arc-shaped groove two, so that the two ends of the moving contact piece form moving contacts, and the middle part of the moving contact piece forms two plug-in pins extending into the plug-in groove. The structural design is ingenious and reasonable, the manufacturing and implementation are highly feasible, and the practicality is strong.

[0012] A further preferred technical solution includes a plurality of through holes circumferentially spaced at the bottom of the annular groove one, which communicate with the pressure relief channel. The stationary contact piece, the first moving contact piece, and the second moving contact piece are all provided with a plurality of downwardly extending buckles spaced along their arc length, and these buckles engage with the corresponding through holes one. The lower ends of both the stationary and moving contact pieces are engaged with the corresponding through holes one at the bottom of the annular groove one via buckles, significantly improving the secure embedding of both within the annular groove one.

[0013] A further preferred technical solution is that the moving contact is integrally bent from the left end of moving contact piece one or the right end of moving contact piece two, and the moving contact has a V-shaped structure with its opening facing the corresponding stationary contact. The moving contact structure is reasonably designed. When the explosion-proof pressure relief valve is in the first state, the moving contact extends through the corresponding notch into the pressure relief channel, maintaining a separated state from the stationary contact. When the explosion-proof pressure relief valve is in the second state, the moving contact extends into the pressure relief channel and provides good contact with the circumferential eaves.

[0014] A further preferred technical solution is that a horizontal support plate is fixed on the valve body inside the pressure relief channel. The horizontal support plate has a central hole penetrating the plate body and a number of pressure relief holes distributed around the outer periphery of the central hole. A pull-down assembly located on the lower end face of the valve cover is slidably connected to the interior of the central hole.

[0015] A further preferred technical solution includes a plug-in post at the center of the lower end face of the valve cover, and a pull-down assembly comprising a pull rod and a spring. The pull rod passes through the center hole of the horizontal support plate, and its upper end is fixed to the plug-in post. The spring is sleeved on the lower end of the pull rod, with its upper end abutting against the horizontal support plate and its lower end abutting against an annular baffle located at the lower end of the pull rod. The pull rod assembly has a simple structural design, ensuring the smooth fabrication and implementation of the explosion-proof pressure relief valve of this utility model.

[0016] A further preferred technical solution includes an annular groove two coaxially located on the outer periphery of the first annular groove on the upper end face of the valve body, with a sealing ring one embedded inside the second annular groove; and an annular groove three coaxially located on the outer periphery of the pressure relief channel on the lower end face of the valve body, with a sealing ring two embedded inside the third annular groove. When the explosion-proof pressure relief valve is in the first state, the sealing ring one seals the valve cover and the upper port of the pressure relief channel; when the explosion-proof pressure relief valve is installed on the housing shell, the sealing ring two seals the lower end of the valve body and the housing shell.

[0017] A further preferred technical solution includes an annular eaves coaxially located on the outer periphery of the second annular groove on the upper end face of the valve body, and an annular groove four on the outer periphery of the lower end face of the valve cover. When the explosion-proof pressure relief valve is in the first state, the annular eaves on the valve body are inserted into the annular groove four on the valve cover. When the explosion-proof pressure relief valve is in the first state, the annular eaves on the valve body are inserted into the annular groove four on the valve cover, significantly improving the secure fit between the valve cover and the upper end of the valve body.

[0018] A further preferred technical solution includes a protrusion on the trigger block for laterally pressing the moving contact piece toward the stationary contact piece and an arc-shaped groove in its rotational direction for accommodating the elastic reset of the moving contact piece; the upper end of the valve body has a polygonal eave extending outwards, and the front edge of the upper end face of the polygonal eave has a mark one, and the front edge of the upper end face of the valve cover has a mark two; when the explosion-proof pressure relief valve is in the first state: the marks one and two correspond to each other, and the protrusion laterally presses the moving contact piece to abut against the stationary contact piece; the height of both the stationary contact piece and the moving contact piece is ≥4mm. After the PACK battery maintenance is completed, reinstall the valve cover onto the valve body. When transitioning from the second state to the first state, apply a certain pressure to the valve cover. First, rotate the valve cover clockwise or counterclockwise a certain distance to accommodate the moving contact piece inside the arc-shaped groove. Then, rotate the valve cover in the opposite direction a certain distance to make the trigger block laterally press the moving contact piece against the stationary contact piece and align the second mark with the first mark on the valve body. Finally, press the valve cover into place, and the explosion-proof pressure relief valve reset is complete. The operation is simple and convenient. The height of both the stationary and moving contact pieces is ≥4mm, ensuring a firm fit between the stationary and moving contacts. Furthermore, the valve cover can only be effectively triggered to open when the valve cover movement distance is greater than the height of the moving contact piece, further preventing false alarms.

[0019] The advantages and beneficial effects of this utility model are as follows:

[0020] 1. This utility model discloses an explosion-proof pressure relief valve. When a thermal runaway fault occurs inside the PACK battery box, the valve cover is compressed by the high-pressure gas inside the box, causing it to push up and open the pressure relief channel on the valve body. This causes the explosion-proof pressure relief valve to change from a first state to a second state. After the explosion-proof pressure relief valve is opened, the trigger block separates from the moving contact, and the moving contact elastically resets and separates from the stationary contact, abutting against and preventing the trigger block from resetting. This effectively prevents the valve cover from self-resetting, thus helping maintenance personnel to promptly detect and troubleshoot faults in the PACK battery and ensuring the safety of PACK battery use. When the explosion-proof pressure relief valve of this utility model is in the first state, the trigger block laterally presses the moving contact and the stationary contact together, that is, the trigger block, the moving contact, and the stationary contact are elastically and tightly connected together, effectively preventing the trigger block and the moving contact from separating under vibration conditions, thereby avoiding false alarms of the explosion-proof pressure relief valve.

[0021] 2. The stationary contact and the moving contact are joined end to end to form a ring structure. The trigger block is a ring-shaped eave that is compatible with the ring structure. In the first state, the connection between the ring eave and the ring structure is stable. In the second state, after the ring eave is pulled out from inside the ring structure, the moving contact is stable when it abuts against the ring eave, effectively preventing the explosion-proof pressure relief valve from triggering an alarm.

[0022] 3. The moving contact is designed as a two-section symmetrically embedded at both ends of the arc-shaped groove, so that the two ends of the moving contact form moving contacts and the middle of the moving contact forms two plug-in pins extending into the plug-in groove. The structure is ingenious and reasonable, with high feasibility in manufacturing and implementation, and strong practicality.

[0023] 4. The lower ends of both the stationary and moving contact pieces are snapped into the corresponding through holes at the bottom of the annular groove, which significantly improves the secure mounting of both pieces inside the annular groove.

[0024] 5. The moving contact is integrally bent from the left end of moving contact piece one or the right end of moving contact piece two, and the moving contact has a V-shaped structure with its opening facing the corresponding stationary contact. The moving contact structure is reasonably designed. When the explosion-proof pressure relief valve is in the first state, the moving contact extends through the corresponding notch into the pressure relief channel and remains separated from the stationary contact. When the explosion-proof pressure relief valve is in the second state, the moving contact extends into the pressure relief channel and provides good abutment against the circumferential eaves.

[0025] 6. When the explosion-proof pressure relief valve is in the first state, the sealing ring 1 seals the valve cover and the upper port of the pressure relief channel; when the explosion-proof pressure relief valve is installed on the outer shell of the enclosure, the sealing ring 2 seals the lower end of the valve body and the outer shell of the enclosure.

[0026] 7. When the explosion-proof pressure relief valve is in the first state, the annular eaves on the valve body are inserted into the annular groove on the valve cover, which significantly improves the installation firmness between the valve cover and the upper end of the valve body.

[0027] 8. After the PACK battery maintenance is completed, reinstall the valve cover onto the valve body. When changing from the second state to the first state, apply a certain pressure to the valve cover. Then, first rotate the valve cover clockwise or counterclockwise a certain distance to accommodate the moving contact piece inside the arc-shaped groove. Then, rotate the valve cover in the opposite direction a certain distance to make the trigger block laterally press the moving contact piece against the stationary contact piece and align the second mark with the first mark on the valve body. Finally, press the valve cover into place. The explosion-proof pressure relief valve reset is then complete. The operation is simple and convenient. The height of both the stationary and moving contact pieces is ≥4mm, ensuring a firm fit between the stationary and moving contacts. The valve cover can only be effectively triggered to open when the valve cover movement distance is greater than the height of the moving contact piece, further preventing false alarms. Attached Figure Description

[0028] Figure 1 This is a top-view perspective view of an explosion-proof pressure relief valve according to this utility model;

[0029] Figure 2 This is a schematic diagram showing the disassembled structure of an explosion-proof pressure relief valve according to this utility model;

[0030] Figure 3 This is a perspective view of an explosion-proof pressure relief valve according to this utility model.

[0031] Figure 4 It is a top-down perspective view of the valve body (with components installed);

[0032] Figure 5 This is a top-down perspective view of the valve body (with components installed).

[0033] Figure 6 This is a top-down perspective view of the valve cover with the pull rod assembly installed.

[0034] Figure 7 This is a top-down perspective view of the valve body;

[0035] Figure 8 This is a three-dimensional view of the valve body from an upward angle;

[0036] Figure 9 It is a top-down perspective view of the stationary contact plate, moving contact plate one, and moving contact plate two.

[0037] Figure 10 It is a three-dimensional view of the stationary contact plate, moving contact plate one, and moving contact plate two from an upward perspective;

[0038] Figure 11 It is a three-dimensional view of the valve cover from an upward angle;

[0039] Figure 12 This is a cross-sectional view of the explosion-proof pressure relief valve of this utility model in the closed state at the positions of the stationary contact and the moving contact;

[0040] Figure 13 This is a schematic diagram of the pressure relief state of an explosion-proof pressure relief valve according to this utility model;

[0041] In the diagram: 1. Valve body; 2. Valve cover; 3. Pull rod; 4. Spring; 5. Stationary contact plate; 6. Moving contact plate one; 7. Moving contact plate two; 8. Sealing ring one; 9. Sealing ring two; 1-1. Polygonal eaves; 1-2. Horizontal support plate; 1-2a. Center hole; 1-2b. Pressure relief hole; 1-3. Arc groove one; 1-4. Arc groove two; 1-5. Notch; 1-6. Through hole one; 1-7. Insert 1-7a, Through Hole 2; 1-8, Annular Groove 2; 1-9, Annular Groove 3; 1-10, Annular Eaves; 2-1, Circumferential Eaves; 2-1a, Protrusion; 2-1b, Arc-shaped Groove; 2-2, Insertion Post; 2-3, Annular Groove 4; 3-1, Annular Baffle; 5-1, Stationary Contact; A, Mark 1; B, Mark 2; C, Buckle; D, Moving Contact; E, Insertion Pin. Detailed Implementation

[0042] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0043] Example

[0044] like Figures 1-13 As shown, this utility model is an explosion-proof pressure relief valve, including a valve body 1 and a valve cover 2. The valve body 1 has a pressure relief channel that runs through both the upper and lower ends. One of the valve body 1 or the valve cover 2 is provided with a corresponding stationary contact piece 5 and a moving contact piece. The other of the valve body 1 or the valve cover 2 is provided with a trigger block that is adapted to the moving contact piece. A pull-down assembly is also provided between the valve body 1 and the valve cover 2.

[0045] The explosion-proof pressure relief valve has a first state and a second state. In the first state, the valve cover 2 closes the pressure relief channel on the valve body 1 through the pull-down assembly, and the trigger block laterally presses the moving contact piece against the stationary contact piece 5. In the second state, the valve cover 2 pushes up to open the pressure relief channel on the valve body 1, and the trigger block separates from the moving contact piece. The moving contact piece elastically resets and separates from the stationary contact piece 5, abutting against and blocking the trigger block from resetting.

[0046] Preferably, the stationary contact piece 5 and the moving contact piece are connected end to end to form a ring structure, the stationary contact 5-1 located at both ends of the stationary contact piece 5 corresponds to the moving contact D located at both ends of the moving contact piece, and the trigger block is a ring-shaped eave body 2-1 that is plugged into and adapted to the ring structure.

[0047] In the first state, the valve cover 2 closes the pressure relief channel on the valve body 1 via the pull-down assembly, and the circumferential eaves 2-1 is inserted into the circumferential structure to drive the moving contact D to abut against the corresponding stationary contact 5-1; in the second state, the valve cover 2 is pushed up to open the pressure relief channel on the valve body 1, and the circumferential eaves 2-1 is pulled out from the circumferential structure, the moving contact D elastically resets and separates from the corresponding stationary contact 5-1, and abuts against the circumferential eaves 2-1 to prevent it from resetting.

[0048] More preferably, the stationary contact 5 and the moving contact 5 are located at the upper end of the valve body 1, the circumferential eaves 2-1 is located on the lower end face of the valve cover 2, the moving contact 5 includes moving contact 6 and moving contact 7, the upper end face of the valve body 1 has an annular groove 1 with an upward opening, two notches 1-5 on the left and right sides of the inner circumferential wall of the annular groove 1 divide the annular groove 1 into an arc groove 1-3 located on the rear side and an arc groove 2-4 located on the front side, the upper end of the pressure relief channel also has a downward opening insertion groove 1-7, the top of the insertion groove 1-7 has two through holes 2-7a corresponding to the middle of the inner side wall of the arc groove 2-4;

[0049] The stationary contact 5 is embedded inside the arc-shaped groove 1-3, and the stationary contacts 5-1 at both ends of the stationary contact 5 are correspondingly attached to the outer side walls of both ends of the arc-shaped groove 1-3. The moving contact 6 is embedded at the left end of the arc-shaped groove 1-4, and the moving contact 7 is correspondingly embedded at the right end of the arc-shaped groove 1-4. The moving contact D at the left end of the moving contact 6 passes through the notch 1-5 on the left side of the annular groove and extends into the pressure relief channel. The moving contact D at the right end of the moving contact 7 passes through the notch 1-5 on the right side of the annular groove and extends into the pressure relief channel. The plug-in pin E at the right end of the moving contact 6 and the plug-in pin E at the left end of the moving contact 7 respectively pass through a corresponding through hole 1-7a and extend into the plug-in groove 1-7.

[0050] More preferably, the bottom of the annular groove is provided with a plurality of through holes 1-6 that communicate with the pressure relief channel. The stationary contact piece 5, the moving contact piece 1 6 and the moving contact piece 2 7 are all provided with a plurality of downwardly extending buckles C along the arc length direction, and the buckles C are engaged with the corresponding through holes 1-6.

[0051] More preferably, the moving contact D is integrally bent from the left end of the moving contact piece 6 or the right end of the moving contact piece 7, and the moving contact D is a V-shaped structure with the opening facing the corresponding stationary contact 5-1.

[0052] More preferably, a horizontal support plate 1-2 located inside the pressure relief channel is fixed on the valve body 1. The horizontal support plate 1-2 has a central hole 1-2a penetrating the plate body and a number of pressure relief holes 1-2b distributed around the outer periphery of the central hole 1-2a. The pull-down assembly located on the lower end face of the valve cover 2 is slidably connected to the interior of the central hole 1-2a.

[0053] More preferably, the valve cover 2 has a plug-in post 2-2 at the center of its lower end face, and the pull-down assembly includes a pull rod 3 and a spring 4. The pull rod 3 passes through the center hole 1-2a on the horizontal support plate 1-2, and the upper end of the pull rod 3 is fixed to the plug-in post 2-2. The spring 4 is sleeved on the lower end of the pull rod 3, and the upper end of the spring 4 abuts against the upper part of the horizontal support plate 1-2, and the lower end abuts against the annular baffle 3-1 located at the lower end of the pull rod 3.

[0054] More preferably, the upper end face of the valve body 1 has an annular groove 2 1-8 coaxially located on the outer periphery of the annular groove 1, and a sealing ring 1 8 is embedded inside the annular groove 2 1-8; the lower end face of the valve body 1 has an annular groove 3 1-9 coaxially located on the outer periphery of the pressure relief channel, and a sealing ring 2 9 is embedded inside the annular groove 3 1-9.

[0055] More preferably, the upper end face of the valve body 1 has an annular eave 1-10 coaxially located on the outer periphery of the annular groove 1-8, and the outer periphery of the lower end face of the valve cover 2 is provided with an annular groove 2-3. When the explosion-proof pressure relief valve is in the first state, the annular eave 1-10 on the valve body 1 is inserted into the annular groove 2-3 on the valve cover 2.

[0056] A further preferred technical solution includes a protrusion 2-1a on the trigger block for laterally pressing the moving contact piece toward the stationary contact piece 5, and an arc-shaped groove 2-1b located in its rotational direction for accommodating the elastic reset of the moving contact piece; the upper end of the valve body 1 has a polygonal eave 1-1 extending outward, and the front edge of the upper end face of the polygonal eave 1-1 is marked with a mark A, and the front edge of the upper end face of the valve cover 2 is marked with a mark B. When the explosion-proof pressure relief valve is in the first state: the marks A and B correspond to each other, and the protrusion 2-1a laterally presses the moving contact piece and abuts against the stationary contact piece 5; the height of the stationary contact piece 5 and the height of the moving contact piece are both ≥4mm.

[0057] Specifically, the left and right ends of the circumferential eaves 2-1 are respectively provided with a protrusion 2-1a and an arc-shaped groove 2-1b located in its rotational direction. When the explosion-proof pressure relief valve is in the first state: the markings A and B correspond to each other, and the protrusion 2-1a laterally presses the moving contact D on the corresponding side to abut against the corresponding stationary contact 5-1.

[0058] The working principle of the explosion-proof pressure relief valve of this utility model is as follows:

[0059] During use, the plug pin E inside the plug slots 1-7 is connected to the warning circuit on the external control system. When the PACK battery heats up normally, the pressure inside the casing remains stable or slightly increases. The side of the valve cover 2 facing the inside of the casing is not subjected to airflow pressure or is subjected to relatively low airflow pressure, so the valve cover 2 does not push up, and the spring 4 does not generate further compression. At this time, the moving contact D is in close contact with the corresponding stationary contact 5-1, and the explosion-proof pressure relief valve is in the first state (see Appendix). Figure 1 and attached Figure 12 The warning circuit is in operation; when the PACK battery overheats abnormally, the pressure inside the casing rises sharply. The side of the valve cover 2 facing the inside of the casing is impacted by a large airflow pressure, causing it to push upward and open the pressure relief channel on the valve body 1. At the same time, the valve cover 2 drives the pull rod 3 to move away from the valve body 1, thereby causing the circumferential eaves 2-1 to disengage from the circumferential structure on the valve body 1. Simultaneously, the moving contact D elastically resets and separates from the corresponding stationary contact 5-1, abutting against and preventing the circumferential eaves 2-1 from resetting. The explosion-proof pressure relief valve changes from the first state to the second state (see Appendix). Figure 13 If the warning circuit is broken, an alarm signal will be sent to the control system.

[0060] After the PACK battery is repaired, the valve cover 2 is reinstalled on the valve body 1, i.e., when changing from the second state to the first state, a certain pressure is applied to the valve cover 2. Then, the valve cover 2 is first rotated clockwise or counterclockwise a certain distance so that the two moving contacts D are respectively accommodated in a corresponding arc-shaped groove 2-1b. Then, the valve cover 2 is rotated in the opposite direction a certain distance so that the mark B is aligned with the mark A on the valve body 1. Finally, the valve cover 2 is pressed into place. At this time, the circumferential eaves 2-1 is inserted into the circumferential structure on the valve body 1, and the protrusion 2-1a abuts against the corresponding moving contact D so that the moving contact D and the corresponding stationary contact 5-1 are fitted together.

[0061] This invention discloses an explosion-proof pressure relief valve. When a thermal runaway fault occurs inside the PACK battery box, the valve cover is compressed by the high-pressure gas inside the box, causing it to rise and open the pressure relief channel on the valve body. This changes the explosion-proof pressure relief valve from a first state to a second state. After the explosion-proof pressure relief valve opens, the trigger block separates from the moving contact, and the moving contact elastically resets and separates from the stationary contact, abutting against and preventing the trigger block from resetting. This effectively prevents the valve cover from self-resetting, thus helping maintenance personnel to promptly detect and troubleshoot faults in the PACK battery and ensuring the safety of PACK battery use. When the explosion-proof pressure relief valve is in the first state, the trigger block laterally presses the moving contact and the stationary contact together, i.e., the trigger block, moving contact, and stationary contact are elastically and tightly connected together. This effectively prevents the trigger block from separating from the moving contact under vibration conditions, thereby avoiding false alarms caused by the explosion-proof pressure relief valve.

[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An explosion-proof pressure relief valve, characterized in that, The valve body (1) includes a valve body (1) and a valve cover (2). The valve body (1) has a pressure relief channel that runs through both the upper and lower ends. One of the valve body (1) or the valve cover (2) is provided with a corresponding stationary contact plate (5) and a moving contact plate. The other of the valve body (1) or the valve cover (2) is provided with a trigger block that is compatible with the moving contact plate. The valve body (1) and the valve cover (2) also have a pull-down assembly between them. The explosion-proof pressure relief valve has a first state and a second state. In the first state, the valve cover (2) closes the pressure relief channel on the valve body (1) through the pull-down assembly, and the trigger block laterally presses the moving contact piece against the stationary contact piece (5). In the second state, the valve cover (2) is pushed up to open the pressure relief channel on the valve body (1), and the trigger block separates from the moving contact piece. The moving contact piece elastically resets and separates from the stationary contact piece (5) and abuts against the trigger block to reset.

2. The explosion-proof pressure relief valve as described in claim 1, characterized in that, The stationary contact piece (5) and the moving contact piece are connected end to end to form a ring structure. The stationary contact (5-1) located at both ends of the stationary contact piece (5) corresponds to the moving contact (D) located at both ends of the moving contact piece. The trigger block is a ring eaves (2-1) that is plugged into and adapted to the ring structure. In the first state, the valve cover (2) closes the pressure relief channel on the valve body (1) through the pull-down assembly, and the circumferential eaves (2-1) is inserted into the circumferential structure to drive the moving contact (D) to abut against the corresponding stationary contact (5-1); in the second state, the valve cover (2) is pushed up to open the pressure relief channel on the valve body (1), and the circumferential eaves (2-1) is pulled out from the circumferential structure, and the moving contact (D) elastically resets and separates from the corresponding stationary contact (5-1) and abuts against the circumferential eaves (2-1) to prevent it from resetting.

3. The explosion-proof pressure relief valve as described in claim 2, characterized in that, The stationary contact (5) and the moving contact are located at the upper end of the valve body (1), and the circumferential eaves (2-1) are located on the lower end face of the valve cover (2). The moving contact includes moving contact one (6) and moving contact two (7). The upper end face of the valve body (1) has an annular groove one with an upward opening. Two notches (1-5) on the left and right sides of the inner circumferential wall of the annular groove one divide the annular groove one into an arc groove one (1-3) located on the rear side and an arc groove two (1-4) located on the front side. The upper end of the pressure relief channel also has a plug groove (1-7) with a downward opening. The top of the plug groove (1-7) has two through holes two (1-7a) corresponding to the middle of the inner side wall of the arc groove two (1-4). The stationary contact piece (5) is embedded inside the arc-shaped groove one (1-3), and the stationary contacts (5-1) at both ends of the stationary contact piece (5) are correspondingly attached to the outer side walls of both ends of the arc-shaped groove one (1-3). The moving contact piece one (6) is embedded at the left end of the arc-shaped groove two (1-4), and the moving contact piece two (7) is correspondingly embedded at the right end of the arc-shaped groove two (1-4). The moving contact (D) at the left end of the moving contact piece one (6) passes through the annular groove one. The notch (1-5) on the left extends into the pressure relief channel. The moving contact (D) located at the right end of the moving contact piece two (7) passes through the notch (1-5) located on the right side of the annular groove one and extends into the pressure relief channel. The plug pin (E) located at the right end of the moving contact piece one (6) and the plug pin (E) located at the left end of the moving contact piece two (7) respectively pass through a corresponding through hole two (1-7a) and extend into the plug groove (1-7).

4. The explosion-proof pressure relief valve as described in claim 3, characterized in that, The bottom of the annular groove is provided with several through holes (1-6) that communicate with the pressure relief channel. The stationary contact piece (5), the moving contact piece 1 (6) and the moving contact piece 2 (7) are all provided with several buckles (C) extending downward along the arc length direction, and the buckles (C) are engaged in the corresponding through holes (1-6).

5. The explosion-proof pressure relief valve as described in claim 4, characterized in that, The moving contact (D) is integrally bent from the left end of the moving contact piece one (6) or the right end of the moving contact piece two (7), and the moving contact (D) is a V-shaped structure with the opening facing the corresponding stationary contact (5-1).

6. The explosion-proof pressure relief valve according to any one of claims 3 to 5, characterized in that, A horizontal support plate (1-2) is fixed on the valve body (1) and located inside the pressure relief channel. The horizontal support plate (1-2) has a central hole (1-2a) that penetrates the plate and several pressure relief holes (1-2b) that are distributed around the outer periphery of the central hole (1-2a). The pull-down assembly located on the lower end face of the valve cover (2) slides through the central hole (1-2a).

7. The explosion-proof pressure relief valve as described in claim 6, characterized in that, The valve cover (2) has a plug-in post (2-2) at the center of its lower end face. The pull-down assembly includes a pull rod (3) and a spring (4). The pull rod (3) passes through the center hole (1-2a) on the horizontal support plate (1-2), and the upper end of the pull rod (3) is fixed on the plug-in post (2-2). The spring (4) is sleeved on the lower end of the pull rod (3), and the upper end of the spring (4) abuts against the upper part of the horizontal support plate (1-2), and the lower end abuts against the annular baffle (3-1) located at the lower end of the pull rod (3).

8. The explosion-proof pressure relief valve as described in claim 7, characterized in that, The valve body (1) has an annular groove 2 (1-8) coaxially located on the outer periphery of the annular groove 1 on the upper end face, and a sealing ring 1 (8) is embedded inside the annular groove 2 (1-8); the valve body (1) has an annular groove 3 (1-9) coaxially located on the outer periphery of the pressure relief channel on the lower end face, and a sealing ring 2 (9) is embedded inside the annular groove 3 (1-9).

9. The explosion-proof pressure relief valve as described in claim 8, characterized in that, The valve body (1) has an annular eave (1-10) on its upper end face, which is coaxially located on the outer periphery of the annular groove two (1-8). The valve cover (2) has an annular groove four (2-3) on its lower end face. When the explosion-proof pressure relief valve is in the first state, the annular eave (1-10) on the valve body (1) is inserted into the annular groove four (2-3) on the valve cover (2).

10. The explosion-proof pressure relief valve as described in claim 1, characterized in that, The trigger block has a protrusion (2-1a) for laterally pressing the moving contact piece toward the stationary contact piece (5) and an arc-shaped groove (2-1b) located in its rotational direction for accommodating the elastic reset of the moving contact piece. The valve body (1) has a polygonal eave (1-1) extending outward to the periphery at the upper end, and the front edge of the upper end of the polygonal eave (1-1) has a mark one (A). The front edge of the upper end of the valve cover (2) has a mark two (B). When the explosion-proof pressure relief valve is in the first state: the mark one (A) and the mark two (B) correspond to each other, and the protrusion (2-1a) laterally presses the moving contact piece to abut against the stationary contact piece (5). The height of the stationary contact piece (5) and the height of the moving contact piece are both ≥4mm.

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