72V mine explosion-proof two-wheeled electric vehicle

Abstract

The application relates to the field of explosion-proof electric vehicles, and discloses a 72V mine-used explosion-proof two-wheeled electric vehicle, which comprises an electric vehicle body, an explosion-proof shell is installed at the position of the electric vehicle body pedal, a pressure relief channel is arranged in the explosion-proof shell, the pressure relief channel is used for guiding sparks and gas generated by the battery, a pressure relief protection mechanism is arranged in the battery isolation plate, the pressure relief protection mechanism is used for cooperating with the pressure relief channel to inhibit sparks and further guide high-temperature flue gas, the gas can be intercepted multiple times through the movement of the flow guide plate on one side of the sliding rod and the arc-shaped baffle, the contact between the gas and the fire-retardant net is avoided, the fire-retardant net is prevented from being blocked, when the arc-shaped baffle moves in the fixed sleeve shell, the area of the flow channel between the arc-shaped baffle and the fixed sleeve shell can be adjusted, the use rate of the fire-retardant net can be further improved, the explosion-proof shell can keep balanced pressure, and explosion caused by unbalanced pressure can be avoided.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof electric vehicle technology, specifically a 72V explosion-proof two-wheeled electric vehicle for mining. Background Technology

[0002] 72V explosion-proof two-wheeled electric vehicles for mining typically refer to special two-wheeled electric vehicles with a rated operating voltage of 72V, suitable for use in underground roadways where flammable and explosive media such as methane and coal dust exist. They are usually used to transport maintenance personnel or small-volume goods. All electrical components, including the motor, electronic control system, and battery compartment, are explosion-proof and equipped with a battery thermal runaway relief protection structure. This prevents the battery from igniting hazardous underground media and causing personal injury due to electrical sparks generated after thermal runaway. However, existing battery thermal runaway relief protection structures still have the following drawbacks: For pressure relief protection solutions for battery thermal runaway, pressure relief ports are generally opened on the outside of the explosion-proof shell and equipped with flame arresters. The irregular pressure relief channels inside the explosion-proof shell, together with the flame arresters, suppress high-temperature smoke and sparks, allowing only high-temperature gas to be discharged outwards. This confines the sparks that can ignite gas and coal dust inside the explosion-proof shell, thereby achieving the effect of explosion protection for electric vehicles. However, this pressure relief protection solution is mostly suitable for scenarios where rapid thermal runaway of the battery cell occurs, resulting in rapid combustion inside the explosion-proof shell and the generation of a large amount of high-temperature gas. Progressive thermal runaway worsens over time and does not instantly generate sparks or high-temperature gases. Furthermore, the electrolyte continuously burns inside the explosion-proof casing, producing a large amount of solid particles. When the gas carrying these particles moves towards the pressure relief port, it first comes into contact with the flame arrestor mesh before exiting. These solid particles clog the mesh. After a certain period of thermal runaway, sparks are generated inside the explosion-proof casing. When these sparks travel with the gas towards the pressure relief port and come into contact with the flame arrestor mesh, the clogged mesh cannot effectively suppress them, potentially causing the sparks to leak out. Furthermore, the continued burning of these sparks further increases the internal pressure of the explosion-proof casing, not only exacerbating the thermochemical reaction of the battery cells and triggering a chain reaction of thermal runaway in adjacent cells, but also intensifying gas and slag production, creating a vicious cycle that ultimately leads to the battery exploding inside the explosion-proof casing. In view of this, the present invention provides a 72V explosion-proof two-wheeled electric vehicle for mining. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a 72V explosion-proof two-wheeled electric vehicle for mining. It solves the problem that existing thermal runaway pressure relief protection structures cannot prevent the loss of fire-retardant mesh effects due to battery short-circuit spontaneous combustion in progressive thermal runaway scenarios. This leads to spark leakage and further exacerbates the thermochemical reaction of the battery cells, resulting in a chain reaction of thermal runaway between other adjacent batteries, further aggravating gas and slag production, and forming a vicious cycle.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A 72V explosion-proof two-wheeled electric vehicle for mining includes an electric vehicle body. An explosion-proof shell is installed at the foot pedal position of the electric vehicle body. Multiple batteries can be installed inside the explosion-proof shell, and each battery is separated by a battery separator plate installed inside the explosion-proof shell. A pressure relief channel is provided inside the explosion-proof shell to guide the sparks and gases generated by the batteries. A pressure relief protection mechanism is provided inside the battery separator plate to work with the pressure relief channel to suppress sparks and further guide the high-temperature flue gas. The pressure relief protection mechanism includes a movable active rod, one end of which is fixedly connected to an arc-shaped baffle. A fixed sleeve is provided on the outer side of the arc-shaped baffle, and multiple flame arresting nets are provided on one side of the arc-shaped baffle for final blocking of sparks. The fixed sleeve is conical, with the diameter of the side closer to the arc-shaped baffle being smaller than the diameter of the side closer to the flame arresting net.

[0005] Preferably, a guide plate is fixedly connected to the outside of the active rod. The guide plate is generally diamond-shaped and has an arc-shaped guide groove on its outer surface. Multiple conical holes are opened around the arc-shaped baffle to intercept particles in the gas.

[0006] Preferably, a sliding rod is fixedly connected to one side of the guide plate, a connecting rod is fixedly connected above the sliding rod, and an arc-shaped push plate is fixedly connected to one end of the connecting rod. The arc-shaped push plate slides inside the battery separator plate, and a sealing foil is provided at the sliding contact part.

[0007] Preferably, the arc-shaped push plate has a C-shaped structure, with its concave side facing the center of the battery separator plate, and the diameter of the conical hole near the fire-resistant mesh is smaller than the diameter near the active rod.

[0008] Preferably, the connection between the arc-shaped baffle and the active rod is recessed, and a spiral guide groove is provided on the inner side of the fixed sleeve to intercept particulate matter in the gas, and the spiral guide groove is located between the flame arrestor and the arc-shaped baffle.

[0009] Preferably, the connecting rod is obliquely arranged, and a sliding column is slidably contacted on the outer side of the connecting rod. A push-pull bracket is fixedly connected to one end of the sliding column, and a storage bag is provided below the push-pull bracket. The storage bag contains a fire extinguishing agent for suppressing sparks.

[0010] Preferably, a feeding mesh plate is provided below the storage bag, and an installation plate is provided on the outside of the feeding mesh plate and the storage bag. The installation plate is detachably connected to the explosion-proof shell, and the connection method adopts a sealing flange.

[0011] Preferably, the sliding column and the battery separator are slidably connected, and a sealing gasket is provided at the sliding position. The feeding mesh and the pressure relief channel are formed in the same shape inside the explosion-proof shell.

[0012] Preferably, the fire-resistant mesh is provided with a fixed outer shell, which is fixedly connected to the explosion-proof shell, and the fixed sleeve is fixedly connected to the fixed outer shell. The size of the fixed outer shell is the same as the size of the pressure relief port.

[0013] Preferably, protective shells are provided at the pressure relief ports on both sides of the electric vehicle body to prevent dust from the mine from entering the interior of the fixed shell and contacting the fire-resistant mesh. Pressure plates are provided on both sides of the battery isolation plate at the pressure relief ports to reduce the instantaneous impact of the pressure relief ports and prevent the fire-resistant mesh from overload and failing.

[0014] This invention provides a 72V explosion-proof two-wheeled electric vehicle for mining. It has the following beneficial effects: 1. This invention uses an arc-shaped push plate to drive a connecting rod, which in turn drives a guide plate and an arc-shaped baffle on one side of the sliding rod. This allows for multiple interceptions of solid particles in the gas, preventing blockage of the flame arrestor mesh after contact with the gas. Blockage of the flame arrestor mesh would prevent it from effectively suppressing sparks, which could then escape from the pressure relief port and ignite underground gas and coal ash, ultimately leading to a safety accident. Furthermore, the arc-shaped baffle, moving within the fixed casing, adjusts the area of ​​the flow channel between the two, preventing the gradual accumulation of gas and smoke from the battery during thermal runaway from being effectively discharged. This further improves the utilization rate of the flame arrestor mesh, further preventing blockage and ensuring that the internal pressure of the explosion-proof casing remains balanced, thus preventing pressure imbalance and potential explosion.

[0015] 2. This invention uses a connecting rod to move a push-pull frame on one side of the sliding column, thereby opening the storage bag and allowing the fire extinguishing agent inside to be evenly sprayed onto the flowing gas inside the pressure relief channel through the feeding mesh. This extinguishes sparks carried by the gas flow. On the one hand, it avoids a large number of sparks impacting the surface of the fire-resistant mesh, thus preventing damage and improving the mesh's spark suppression effect and surface cleanliness. On the other hand, it prevents the fire extinguishing agent from quickly and timely suppressing sparks even if the battery experiences instantaneous thermal runaway and generates a large amount of gas and sparks. Furthermore, it prevents sparks from flowing with the gas towards the fire-resistant mesh and leaking out when discharged from the pressure relief port, thus further improving the safety of the electric vehicle in underground mining operations. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the explosion-proof shell and mounting plate of the present invention; Figure 3 This is a schematic diagram of the battery and battery separator of the present invention; Figure 4 This is a schematic diagram of the pressure relief channel of the present invention; Figure 5 This is a schematic diagram of the pressure relief and protection mechanism of the present invention; Figure 6 This is a schematic diagram of the arc-shaped baffle and the fixed sleeve of the present invention; Figure 7 This is a side view schematic diagram of the arc-shaped baffle and the fixed sleeve of the present invention; Figure 8 This is a schematic diagram of the spiral guide groove and tapered hole of the present invention; Figure 9 This is a schematic diagram of the push-pull frame and storage bag of the present invention; Figure 10 This is a top view schematic diagram of the connecting rod and push-pull bracket of the present invention; Figure 11 This is a bottom view of the connecting rod and push-pull bracket of the present invention.

[0017] The components include: 1. Electric vehicle body; 2. Explosion-proof shell; 3. Mounting plate; 4. Battery; 5. Battery isolation plate; 6. Pressure relief channel; 7. Pressure relief protection mechanism; 701. Arc-shaped push plate; 702. Connecting rod; 703. Sliding rod; 704. Guide plate; 705. Active rod; 706. Arc-shaped baffle; 707. Fixed sleeve; 708. Fireproof net; 709. Spiral guide groove; 710. Conical hole; 711. Sliding column; 712. Push-pull frame; 713. Feeding mesh plate; 714. Storage bag; 715. Fixed outer shell; 8. Protective shell; 9. Pressure plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 6 As shown, the present invention provides a 72V mining explosion-proof two-wheeled electric vehicle, including an electric vehicle body 1. An explosion-proof shell 2 is installed at the foot pedal position of the electric vehicle body 1. Multiple batteries 4 can be installed inside the explosion-proof shell 2, and each battery 4 is separated from each other by a battery isolation plate 5 installed inside the explosion-proof shell 2. A pressure relief channel 6 is provided inside the explosion-proof shell 2 to guide the sparks and gas generated by the battery 4. A pressure relief protection mechanism 7 is provided inside the battery isolation plate 5 to work with the pressure relief channel 6 to suppress sparks and further guide the high-temperature flue gas. The pressure relief protection mechanism 7 includes a movable active rod 705. One end of the active rod 705 is fixedly connected to an arc-shaped baffle 706. A fixed sleeve 707 is provided on the outer side of the arc-shaped baffle 706. Multiple flame arresting nets 708 are provided on one side of the arc-shaped baffle 706 for final blocking of sparks. The fixed sleeve 707 is conical, and the diameter of the side near the arc-shaped baffle 706 is smaller than the diameter of the side near the flame arresting nets 708.

[0020] Please see Figures 1 to 6As shown, to improve the safety of battery 4 inside the explosion-proof housing 2 and prevent the battery 4 from experiencing gradual thermal runaway and spark leakage, which could ultimately lead to an explosion inside the explosion-proof housing 2 and cause a safety accident, a pressure relief channel 6 is provided inside the explosion-proof housing 2. When battery 4 experiences thermal runaway, the generated gas and solid particles will flow towards the pressure relief port inside the pressure relief channel 6 under pressure. Meanwhile, some gas and particles will flow towards the pressure relief port inside the battery separator 5. The pressure relief channel 6 inside the battery separator 5 and the explosion-proof housing 2 can divert the gas and particles. The diverted gas then flows towards the pressure relief port for discharge. Furthermore, because the pressure relief channel 6 is located on the outside of the explosion-proof housing 2, while the channel inside the battery separator 5 is closer to the pressure relief port, the pressure relief channel 6 inside the battery separator 5... The flowing gas and particles can reach the pressure relief port more quickly, and then the gas flowing through the pressure relief channel 6 will reach the pressure relief port later. This allows the diverted gas and particles to be discharged from the pressure relief port in sequence. The flame arrestor 708 will suppress the sparks, allowing only the high-temperature gas to be discharged from the pressure relief port. On the one hand, this can greatly reduce the excessive impact on the flame arrestor 708 set at the pressure relief port, and prevent a large number of particles from blocking the flame arrestor 708 instantly, so that the flame arrestor 708 cannot suppress the continuously generated sparks. On the other hand, when the sparking gas and particles flow inside the pressure relief channel 6, some of them will be lost, making the flame arrestor 708 more effective in suppressing them. This will prevent the high-temperature smoke and particles from being continuously generated inside the explosion-proof shell 2, causing the internal pressure to rise continuously, and eventually causing the battery 4 to explode inside the explosion-proof shell 2. It should be explained that because batteries 4 are distributed around the battery separator 5, as... Figure 3 and Figure 4As shown, the two batteries 4 are connected together through the connection hole on the inner side of the battery separator 5, forming a working voltage of 72V. Therefore, when one of the batteries 4 experiences thermal runaway due to an internal short circuit, the gas and particles at the contact point between the side of the battery 4 and the battery separator 5 and the explosion-proof shell 2 will be forced into the pressure relief channel 6 and the interior of the battery separator 5 under pressure. The gas flowing inside the battery separator 5 will drive the active rod 705 to move continuously towards the pressure relief port. The movement of the active rod 705 will drive the arc-shaped baffle 706 to move towards the position of the fire arrestor 708 inside the fixed shell 707. The gas flowing to the pressure relief port through the internal channel of the battery separator 5 will first contact the arc surface of the arc-shaped baffle 706, and then be guided by its arc surface to the surrounding area, continuing to flow towards the position of the fire arrestor 708. The particles in the gas will be intercepted by the arc surface of the arc-shaped baffle 706, and the sparks in the gas will be suppressed by the fire arrestor 708 after contacting it, thereby achieving the effect of extinguishing the fire. Furthermore, as the problematic battery 4 continues to generate gas and particles, the distance between the arc-shaped baffle 706 and the inner side of the fixed housing 707 increases as the arc-shaped baffle 706 moves within the fixed housing 707. This is because most of the gas and particles that initially pass through the pressure relief port flow to this location via the battery separator 5. When these particles subsequently flow through the pressure relief channel 6 to this location, the amount of gas and particles increases significantly. If the arc-shaped baffle 706 and the inner side of the fixed housing 707 maintain a flow channel of the same volume, it is highly likely that gas and particles will become blocked or turbulent, reducing the spark suppression effect of the flame arrestor 708. As the arc-shaped baffle 706 moves from the inside of the fixed housing 707 towards the position of the flame arrestor 708, the flow area between the arc-shaped baffle 706 and the fixed housing 707 can be increased. On the one hand, this can prevent gas blockage at this position, allowing gas and particles to flow stably and avoiding gas turbulence, thus ensuring the efficiency of gas discharge from the pressure relief port. On the other hand, it can improve the effect of spark suppression, preventing spark leakage and avoiding excessive pressure increase inside the explosion-proof housing 2, which could lead to the battery 4 exploding inside the explosion-proof housing 2, thereby improving the safety of electric vehicles used in mines.

[0021] In one specific embodiment, a guide plate 704 is fixedly connected to the outside of the active rod 705. The guide plate 704 is generally diamond-shaped and has an arc-shaped guide groove on its outer surface. Multiple conical holes 710 are opened around the arc-shaped baffle 706 to intercept particles in the gas.

[0022] Please see Figures 5 to 8As shown, when the gas flowing inside the battery separator 5 carries particles towards the pressure relief port, when the active rod 705 moves the arc-shaped baffle 706 inside the fixed housing 707, the active rod 705 also moves the guide plate 704 synchronously. Because arc-shaped guide grooves are provided on the surface, such as... Figure 5 and Figure 6 As shown, when gas flows over its surface, the particles in the gas are first intercepted to a certain extent by the arc-shaped guide groove of the guide plate 704. Then, the gas, carrying a small number of remaining particles, impacts the arc-shaped surface of the arc-shaped baffle 706. Moreover, because the guide plate 704 is diamond-shaped, when the gas carrying particles comes into contact with the guide plate 704, the guided gas and particles are guided by the diamond-shaped surface and impacted together. The particles fall off after the impact and collision, while the gas continues to flow towards the arc surface of the arc-shaped baffle 706. Therefore, the particles can be further cleaned, and when the gas guided by the arc-shaped baffle 706 is discharged through the flame arrestor 708, the flame arrestor 708 can be further prevented from being blocked, thus improving the cleanliness of the flame arrestor 708. Furthermore, when the gas impacts the arc surface of the arc-shaped baffle 706, and the arc-shaped baffle 706 further diverts and guides the gas and particles, by opening conical holes 710 around the arc-shaped baffle 706, the gas is guided to the position of the conical holes 710. Some of the gas will impact and flow towards the surface of the flame arrestor mesh 708 from the position of the conical holes 710, while the other part will continue to flow through the gap between the arc-shaped baffle 706 and the fixed sleeve 707. The gas flow distance directly through the conical holes 710 to the position of the flame arrestor mesh 708 is less than the distance flowed from the arc surface of the arc-shaped baffle 706. Therefore, the purpose of diversion can be achieved again, so that the flame arrestor mesh 708 is subjected to less impact, which can better suppress sparks and allow the gas to be discharged better.

[0023] In one specific embodiment, a sliding rod 703 is fixedly connected to one side of the guide plate 704, a connecting rod 702 is fixedly connected above the sliding rod 703, and an arc-shaped push plate 701 is fixedly connected to one end of the connecting rod 702. The arc-shaped push plate 701 slides inside the battery separator plate 5, and a sealing foil is provided at the sliding contact part.

[0024] Please continue reading. Figure 5 and Figure 6As shown, when a battery 4 experiences thermal runaway, the resulting gas and particles enter the battery separator 5. An arc-shaped pusher 701 is installed inside the battery separator 5. When the gas flows inside the battery separator 5, it first contacts the inner arc surface of the arc-shaped pusher 701. A sealing foil is placed at the sliding position between the arc-shaped pusher 701 and the battery separator 5. As gas and particles continue to be generated, they push the arc-shaped pusher 701 towards the pressure relief port. The movement of the arc-shaped pusher 701 drives the sliding rod 703 and the active rod 705 to move synchronously via the connecting rod 702. After the arc-shaped push plate 701 moves to the designated position, and the sealing foil is damaged, the gas and particles will continue to flow from the gap between the arc-shaped push plate 701 and the battery separator plate 5 towards the pressure relief port. At this time, the sealing foil will first intercept the particles in the gas, and then intercept them again after passing through the guide plate 704. Finally, after impacting the arc surface of the arc-shaped baffle 706, it will be intercepted again. This allows only a very small number of particles to remain when the gas impacts the surface of the flame arrestor 708, without affecting the normal suppression of sparks by the flame arrestor 708, and allowing the gas to be discharged normally from the pressure relief port.

[0025] In one specific embodiment, the arc-shaped push plate 701 has a C-shaped structure, with its concave side facing the center of the battery separator plate 5, and the diameter of the tapered hole 710 near the fire arrestor mesh 708 is smaller than the diameter near the active rod 705.

[0026] Please see Figure 7 and Figure 8 As shown, because the arc-shaped pusher plate 701 is C-shaped, the gas and particulate matter generated by the battery 4 are continuously forced into the internal channel of the battery separator 5 and flow towards the arc-shaped pusher plates 701 on both sides. Since the arc-shaped pusher plate 701 is directly opposite the pressure relief port, and the battery separator 5 only has pressure relief ports on both sides of the arc-shaped pusher plate 701, the arc-shaped pusher plate 701 will be continuously subjected to pressure from the gas and particles, allowing it to slide inside the battery separator 5. This, in turn, drives the arc-shaped baffle 706 to slide inside the fixed housing 707. Figure 7 As shown, the gas particles are intercepted in multiple stages before being discharged. Even if the spark flows with the gas toward the pressure relief port, the spark will be greatly lost during the flow. When it impacts the flame arrestor 708, the flame arrestor 708 will effectively improve its suppression effect, fully preventing the spark from leaking out of the pressure relief port. When the gas carrying a few particles flows through the arc surface of the arc-shaped baffle 706 and continues to flow towards the position of the flame arrestor 708, the conical hole 710, which is set in a conical shape, intercepts the particles again. At the same time, the gas flowing through the conical hole 710 with the Venturi effect will generate a greater impact. At this time, the spark will accelerate towards the surface of the flame arrestor 708 and come into contact with it. The flame arrestor 708 can further improve the effect of spark suppression.

[0027] In one specific embodiment, the connection between the arc-shaped baffle 706 and the active rod 705 is recessed, and a spiral guide groove 709 is provided on the inner side of the fixed sleeve 707 for intercepting particulate matter in the gas, and the spiral guide groove 709 is located between the flame arrestor mesh 708 and the arc-shaped baffle 706.

[0028] Please continue reading. Figure 7 and Figure 8 It should be explained that even though the sealing foil and the inner conical holes 710 of the arc-shaped push plate 701, guide plate 704 and arc-shaped baffle 706 can effectively intercept solid particles in the gas, some small particles may still not be intercepted. Since the problematic battery 4 continuously generates gas and particles, prolonged depressurization of the battery 4 may reduce the effectiveness of particle interception. Therefore, by setting the connection position between the arc-shaped baffle 706 and the active rod 705 in a concave shape, when the diamond-shaped guide plate 704 guides the gas, the gas flow path is changed by the arc surface of the arc-shaped baffle 706 when it impacts the concave position in the middle of the arc-shaped baffle 706. Therefore, the arc-shaped baffle 706 can further improve the particle interception effect. By creating an arc-shaped spiral guide groove 709 on the inner side of the fixed housing 707, and positioning the spiral guide groove 709 on the flow path between the flame arrestor mesh 708 and the arc-shaped baffle 706, even if some uninterrupted particles are about to impact the flame arrestor mesh 708, the gas carrying a very small amount of particles will flow inside the spiral guide groove 709, ultimately intercepting the particles and further improving the cleanliness of the flame arrestor mesh 708. This allows the battery 4 to experience gradual thermal runaway. Even after prolonged generation of gas and particles, the flame arrestor mesh 708 can always maintain an effect that suppresses sparks, preventing blockage and thus avoiding an increase in overall pressure inside the explosion-proof housing 2, which could ultimately lead to an explosion.

[0029] In one specific embodiment, the connecting rod 702 is obliquely arranged, and a sliding column 711 is slidably contacted on the outer side of the connecting rod 702. A push-pull bracket 712 is fixedly connected to one end of the sliding column 711. A storage bag 714 is arranged below the push-pull bracket 712, and the storage bag 714 contains a fire extinguishing agent for suppressing sparks.

[0030] Please see Figures 9 to 11 As shown, when the arc-shaped push plate 701 is continuously subjected to the squeezing force from the gas and slides inside the battery separator 5, the connecting rod 702 driven by the arc-shaped push plate 701 moves inside the battery separator 5, which pushes the sliding column 711 to move from the inside to the outside. The movement of the sliding column 711 will push the push-pull frame 712 to move outward. The movement of the push-pull frame 712 will open the storage bag 714, allowing the fire extinguishing agent inside to be sprayed into the pressure relief channel 6. This suppresses the sparks in the flowing gas first, which can prevent the battery 4 from continuously generating gas and sparks. If they flow together towards the pressure relief port and cause blockage, it is very easy for sparks to leak out. The fire extinguishing agent can suppress the sparks flowing inside the pressure relief channel 6 in advance, thereby improving the subsequent spark suppression effect of the fire arrestor 708.

[0031] In one specific embodiment, a feeding mesh plate 713 is provided below the storage bag 714, and an mounting plate 3 is provided on the outside of the feeding mesh plate 713 and the storage bag 714. The mounting plate 3 is detachably connected to the explosion-proof shell 2, and the connection method adopts a sealing flange.

[0032] Please continue reading. Figures 9 to 11 As shown, when the storage bag 714 needs to be installed directly above the pressure relief channel 6, it is first installed together with the feeding mesh plate 713 below the mounting plate 3, making them a whole, and facing directly above the pressure relief channel 6 opened inside the explosion-proof shell 2. The explosion-proof shell 2 and the mounting plate 3 are connected in the form of a sealing flange, which can make the explosion-proof shell 2 in a sealed state. Only two pressure relief ports are provided on both sides, which can effectively improve the overall rigidity of the explosion-proof shell 2 and prevent the battery 4 from gradually thermally running away and causing the battery 4 to catch fire and explode rapidly inside the explosion-proof shell 2.

[0033] In one specific embodiment, the sliding column 711 is slidably connected to the battery separator 5, and a sealing gasket is provided at the sliding position. The feeding mesh plate 713 and the pressure relief channel 6 are opened with the same shape inside the explosion-proof shell 2.

[0034] Please see Figure 10 and Figure 11As shown, when the connecting rod 702 pushes the sliding column 711 from the inside to the outside through the side inclined surface, the sliding column 711 will slide inside the battery separator 5, thereby driving the push-pull bracket 712 to move above the storage bag 714, that is, inside the mounting plate 3, thereby opening the storage bag 714, so that the fire extinguishing agent inside the storage bag 714 falls into the pressure relief channel 6 through the discharge mesh plate 713 set below, and performs fire extinguishing operation on the gas flowing inside the pressure relief channel 6 with sparks, avoiding excessive impact of sparks on the surface of the fire arrestor 708, which would prevent the gas from being effectively discharged from the pressure relief port on one side of the fire arrestor 708; It needs to be explained that the push-pull frame 712, the feeding mesh plate 713, and the storage bag 714 are all located below the mounting plate 3. When the mounting plate 3 is installed inside the explosion-proof shell 2, the mounting plate 3 will move along with it into the explosion-proof shell 2. Since the connecting rod 702 has not moved inside the battery separator plate 5 at this time, there is still a certain gap between the sliding column 711 and the connecting rod 702 after the mounting plate 3 is installed inside the explosion-proof shell 2. This gap will not interfere with the normal installation of the mounting plate 3. Only after the connecting rod 702 moves inside the battery separator plate 5 will its inclined surface push the sliding column 711 to move. Moreover, the continuous movement of the connecting rod 702 at this time also indicates that the gas and sparks generated by the battery 4 are gradually increasing. Relying solely on the fire-resistant mesh 708 may not be able to effectively extinguish the sparks. Therefore, it can further improve safety, ensure the pressure balance inside the explosion-proof shell 2, and avoid pressure imbalance and explosion in the mine.

[0035] In one specific embodiment, a fixed outer shell 715 is provided on the outside of the fire arrestor mesh 708. The fixed outer shell 715 is fixedly connected to the explosion-proof shell 2. The fixed sleeve 707 is fixedly connected to the fixed outer shell 715. The size of the fixed outer shell 715 is the same as the size of the pressure relief port.

[0036] Please see Figures 5 to 7 As shown, when gas and sparks impact the flame arrestor 708, the gas will be discharged from the fixed housing 715 on the outside of the flame arrestor 708 to the pressure relief port. The fixed housing 715 is the same size as the pressure relief port, which makes it easier for the gas to be discharged from it.

[0037] In one specific embodiment, protective shells 8 are provided at the pressure relief ports on both sides of the electric vehicle body 1 to prevent underground dust from entering the interior of the fixed shell 715 and contacting the fire-resistant mesh 708. Pressure plates 9 are provided on both sides of the battery isolation plate 5 at the pressure relief ports to reduce the instantaneous impact of the pressure relief ports and prevent the fire-resistant mesh from overload failure.

[0038] Please see Figures 4 to 8As shown, in order to prevent dust and other debris from entering the interior of the fixed housing 715 and adhering to the mesh of the fire-resistant mesh 708, causing the fire-resistant mesh 708 to become clogged due to the influence of external dust, a protective shell 8 is installed at the pressure relief port on one side of the fixed housing 715 to prevent dust from entering the interior of the fixed housing 715. It needs to be explained that the pressure relief protection mechanism 7 can effectively prevent the gradual thermal runaway of battery 4, avoiding a continuous increase in the overall pressure inside the explosion-proof shell 2 and the resulting pressure imbalance, which could lead to an explosion. If battery 4 generates gas and sparks for a long time, it may generate a momentary impact force after reaching a critical value. At this time, the flame arrestor 708 may not be able to effectively block the sparks. Therefore, a pressure plate 9 is set on the side of the battery isolation plate 5 located at the pressure relief port to prevent the instantaneous pressure imbalance inside the explosion-proof shell 2 caused by the momentary impact force generated by battery 4. Because one side of the battery isolation plate 5 is connected not only to the pressure relief port, but also to the pressure relief channel 6 opened inside the explosion-proof shell 2, after the battery isolation plate 5 is fully opened, the excess gas that cannot be quickly discharged from the fixed shell 715 can be evenly distributed into the pressure relief channel 6, thereby further improving the pressure balance effect inside the explosion-proof shell 2, so that the overall pressure inside the explosion-proof shell 2 is in a balanced state, and further preventing the battery 4 inside the explosion-proof shell 2 from exploding.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 72V explosion-proof two-wheeled electric vehicle for mining, comprising an electric vehicle body (1), characterized in that, An explosion-proof shell (2) is installed at the foot pedal position of the electric vehicle body (1). Multiple batteries (4) can be installed inside the explosion-proof shell (2), and each battery (4) is separated by a battery isolation plate (5) installed inside the explosion-proof shell (2). A pressure relief channel (6) is provided inside the explosion-proof shell (2) to guide the sparks and gas generated by the battery (4). A pressure relief protection mechanism (7) is provided inside the battery isolation plate (5) to cooperate with the pressure relief channel (6) to suppress sparks and further guide the high-temperature flue gas. The pressure relief protection mechanism (7) includes a movable active rod (705), one end of which is fixedly connected to an arc-shaped baffle (706). A fixed sleeve (707) is provided on the outer side of the arc-shaped baffle (706). Multiple fire-resistant nets (708) are provided on one side of the arc-shaped baffle (706) for final blocking of sparks. The fixed sleeve (707) is cone-shaped, and the diameter of the side near the arc-shaped baffle (706) is smaller than the diameter of the side near the fire-resistant net (708).

2. The 72V explosion-proof two-wheeled electric vehicle for mining according to claim 1, characterized in that, A guide plate (704) is fixedly connected to the outside of the active rod (705). The guide plate (704) is generally diamond-shaped and has an arc-shaped guide groove on its outer surface. Multiple conical holes (710) are opened around the arc-shaped baffle (706) to intercept particles in the gas.

3. The 72V explosion-proof two-wheeled electric vehicle for mining according to claim 2, characterized in that, A sliding rod (703) is fixedly connected to one side of the guide plate (704), and a connecting rod (702) is fixedly connected above the sliding rod (703). An arc-shaped push plate (701) is fixedly connected to one end of the connecting rod (702). The arc-shaped push plate (701) slides inside the battery separator plate (5), and a sealing foil is provided at the sliding contact part.

4. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 3, characterized in that, The arc-shaped push plate (701) has a C-shaped structure, and the concave side faces the center of the battery separator plate (5). The diameter of the conical hole (710) near the fireproof mesh (708) is smaller than the diameter near the active rod (705).

5. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 4, characterized in that, The arc-shaped baffle (706) and the active rod (705) are connected in a concave shape. The inner side of the fixed sleeve (707) is provided with a spiral guide groove (709) for intercepting particulate matter in the gas. The spiral guide groove (709) is located between the flame arrestor net (708) and the arc-shaped baffle (706).

6. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 3, characterized in that, The connecting rod (702) is obliquely arranged, and a sliding column (711) is slidably contacted on the outer side of the connecting rod (702). A push-pull bracket (712) is fixedly connected to one end of the sliding column (711). A storage bag (714) is arranged below the push-pull bracket (712), and the storage bag (714) contains a fire extinguishing agent for suppressing sparks.

7. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 6, characterized in that, A feeding mesh plate (713) is provided below the storage bag (714). An installation plate (3) is provided on the outside of the feeding mesh plate (713) and the storage bag (714). The installation plate (3) is detachably connected to the explosion-proof shell (2), and the connection method is a sealing flange.

8. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 7, characterized in that, The sliding column (711) is slidably connected to the battery separator (5), and a sealing gasket is provided at the sliding position. The feeding mesh plate (713) and the pressure relief channel (6) are opened in the same shape inside the explosion-proof shell (2).

9. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 1, characterized in that, The fire-resistant mesh (708) is provided with a fixed outer shell (715) on the outside. The fixed outer shell (715) is fixedly connected to the explosion-proof shell (2). The fixed sleeve (707) is fixedly connected to the fixed outer shell (715). The size of the fixed outer shell (715) is the same as the size of the pressure relief port.

10. A 72V explosion-proof two-wheeled electric vehicle for mining according to claim 9, characterized in that, The electric vehicle body (1) is provided with protective shells (8) at the pressure relief ports on both sides to prevent dust from the mine from entering the interior of the fixed shell (715) and contacting the fireproof net (708). The battery isolation plate (5) is provided with pressure plates (9) at the pressure relief ports on both sides to reduce the instantaneous impact of the pressure relief ports and avoid the fireproof net from overload failure.

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