A counterbalance forklift battery explosion-proof device

Abstract

The application relates to the technical field of storage batteries, and discloses a balanced heavy forklift storage battery explosion-proof device. In order to solve the problem that an electric arc ignites the accumulated gas in the battery box, causing the battery box to explode. The blocking mechanism is arranged. When the charging plug is connected with the socket, the operator drives the clamping plate to be horizontally inserted into the clamping groove of the charging plug, the charging plug is locked and fixed, the arc ignition source caused by the mistaken pulling of the charging plug during charging is eliminated, explosion is prevented, then, when the battery is charging, the gas pressure in the box body drives the sliding table to move upwards, the gas in the box body is discharged from the pressure relief hole in the sliding table and the fire blocking core, the excessive accumulation of the gas in the box body is avoided, the probability of the explosion of the battery box is reduced, meanwhile, the upwardly moving sliding table blocks the resetting path of the clamping plate, the clamping plate is prevented from being reset due to the influence of the external environment, the charging plug is further locked and fixed, the arc ignition source caused by the mistaken pulling of the charging plug during charging is eliminated, and explosion is prevented.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an explosion-proof device for counterbalanced forklift batteries. Background Technology

[0002] Counterbalance forklifts are the most mainstream and widely used type of forklift in industrial logistics. Their core feature is that they have a built-in counterweight at the rear, which can achieve load balance without the need for outriggers. In counterbalance forklifts, batteries are an essential component.

[0003] However, during the charging process, the aforementioned batteries will produce gases (for example, when a lead-acid battery is charging, electrical energy reduces lead sulfate to lead and lead dioxide. The electrolyte in the battery is dilute sulfuric acid + water. When the voltage increases and the battery is close to being fully charged, the excess electrical energy is no longer used to reduce lead sulfate, but is directly electrolyzed to produce hydrogen (flammable and explosive) and oxygen (combustion-supporting)). When the generated gases reach a certain concentration in the battery box, if the operator accidentally unplugs the charging plug, or if the charging plug becomes loose due to external environmental factors, an arcing ignition source can easily be generated between the charging plug and the socket, which may lead to a risk of battery explosion. Summary of the Invention

[0004] This application proposes an explosion-proof device for counterbalanced forklift batteries, which has the advantage of reducing the probability of arcing ignition sources between the charging plug and the battery socket, thereby solving the problem of electric arc igniting the gas accumulated inside the battery box and causing the battery box to explode.

[0005] To achieve the above objectives, this application adopts the following technical solution: an explosion-proof device for a counterbalanced forklift battery, comprising: a housing, wherein a battery is disposed inside the housing, a cover is installed on the upper side of the housing, and sockets are fixedly installed on both sides inside the cover, the lower ends of the sockets being electrically connected to the positive and negative terminals of the battery respectively, and charging plugs being electrically connected to the upper sides of the sockets; a blocking mechanism is provided on the upper side of the cover, located on the opposite side of the sockets, the blocking mechanism comprising: The mounting shell is fixedly installed on the upper side of the cover; The limiting platform is fixedly installed at the bottom of the inner cavity of the mounting housing; A retaining plate is slidably installed in the inner cavity of the mounting shell, and the mounting shell cooperates with the limiting platform to limit the retaining plate; The limiting hole is located on the upper side inside the mounting housing; The lever is slidably engaged in the limiting hole, and the lower end of the lever is fixedly connected to the plate. A card slot is provided at the position where the charging plug faces the card plate. When the end of the card plate facing the card slot is inserted into the card slot, the axial displacement of the charging plug is restricted. The cap is equipped with a pressure relief mechanism inside, and the upper side of the cap is provided with an arc-shaped strip and a cleaning needle plate, which is used to unclog the pressure relief mechanism.

[0006] Furthermore, the pressure relief mechanism includes: The slide is slidably installed in the middle of the cover; A spring is disposed between the lower side of the upper extension edge of the slide and the upper side of the cover; The outer casing is fitted over the outside of the spring, and the lower side of the outer casing is fixedly connected to the cover; A pressure relief hole is located inside the slide. The pressure relief hole is a T-shaped hole. The lower port of the pressure relief hole is connected to the inner cavity of the housing, and the upper port of the pressure relief hole is located on the arc-shaped side of the slide. When not charging, the uppermost part of the upper port of the pressure relief hole is connected to the external environment.

[0007] Furthermore, the pressure relief mechanism also includes: The flame arrestor core is fixedly installed inside the upper port of the pressure relief hole. The flame arrestor core is a microporous sintered stainless steel flame arrestor core. The mating length between the sliding table and the cover is ≥25mm. The gap between the sliding table and the cover is ≤0.15mm. The mating surface is plated with hard chrome.

[0008] Furthermore, the curved side of the slide table is provided with a curved groove, which is connected to the upper port of the pressure relief hole. The curved strip is inserted into the inside of the curved groove. There is a gap between the concave surface of the curved strip and the corresponding side of the curved groove. The middle position of the convex surface of the curved strip is fixedly connected to the clamping plate. When the clamping plate drives the curved strip to disengage from the curved groove, both ends of the concave surface of the curved groove are separated from the curved side of the slide table by a distance in millimeters.

[0009] Furthermore, the cleaning needle plate is positioned on the concave side of the arc-shaped strip corresponding to the flame arrestor core, and the outer diameter of the needle plate is smaller than the micropore diameter of the flame arrestor core.

[0010] Furthermore, a storage groove is formed on the concave surface of the arc-shaped strip, and the cleaning needle plate is slidably installed in the storage groove. A telescopic cylinder is fixedly installed inside the clamping plate. The telescopic rod of the telescopic cylinder extends into the storage groove and is fixedly connected to the cleaning needle plate. A remote control switch is fixedly installed on the side wall of the limiting hole near the slide table. The remote control switch is remotely connected to the telescopic cylinder. A contact block is fixedly installed on the side of the lever facing the slide table. When the contact block contacts the remote control switch, the telescopic rod of the telescopic cylinder extends. When the contact block separates from the remote control switch, the telescopic rod of the telescopic cylinder retracts and resets.

[0011] Furthermore, the needle body of the cleaning needle plate has a tapered blunt tip design, the needle body is made of 316L stainless steel, and the surface of the needle body is mirror polished.

[0012] Furthermore, the needle body of the cleaning needle plate has an annular protrusion near the root, and a sealing ring is fixedly fitted on the side of the annular protrusion facing the slide. The sealing ring is a miniature fluororubber sealing ring, and a miniature venting notch is axially opened inside the sealing ring.

[0013] This application has the following beneficial effects: This application provides an explosion-proof device for a counterbalanced forklift battery. By setting up a blocking mechanism, when the charging plug is connected to the socket, the operator moves the locking plate so that the locking plate is horizontally inserted into the slot of the charging plug. Through this action, the charging plug is locked and fixed, eliminating the arcing ignition source caused by accidentally unplugging the charging plug during charging and preventing an explosion.

[0014] By incorporating a blocking mechanism and a pressure relief mechanism, during battery charging (normal charging or overcharging), the gas pressure inside the battery box causes the slide to move upwards, allowing the gas inside the box to be discharged through the pressure relief hole and the flame arrestor core within the slide. This action prevents excessive gas accumulation inside the box, reducing the probability of battery box explosion. At the same time, the upward-moving slide blocks the reset path of the locking plate, preventing the locking plate from resetting due to external environmental influences. This further locks and secures the charging plug, eliminating the arcing ignition source from accidentally unplugging the charging plug during charging and preventing explosion.

[0015] By incorporating a blocking mechanism, a pressure relief mechanism, and arc-shaped grooves and strips, when the battery is not charging, the end of the clamp facing the slide table drives the arc-shaped strip to extend into the arc-shaped groove inside the slide table. This restricts the axial movement of the slide table, strongly binding the battery's venting action to its charging status. Only when all charging preparations are completed (the charging plug is inserted and the clamp locks the charging plug) can the slide table vent normally (micro-venting allows for normal operation). This completely avoids ineffective or erroneous actions of the slide table and prevents wear on the slide table from causing the battery box's explosion-proof mating surface to lose its explosion-proof capability.

[0016] By setting up a blocking mechanism, a pressure relief mechanism, an arc groove and an arc strip, when the battery is charging, the card plate drives the arc strip to extend out of the arc groove. At this time, the two ends of the arc strip are on the outside of the slide table and there is a small gap between them and the axial side of the slide table, which in turn guides the slide table and ensures that the slide table can move linearly upward with pressure throughout its entire life cycle, and the exhaust action is stable and controllable. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0018] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the installation position of the pressure relief mechanism of the present invention; Figure 3 This is a schematic diagram of the internal structure of the cap of the present invention; Figure 4 This is a schematic diagram showing the location of the arc-shaped groove in this invention; Figure 5 This is a schematic diagram of the internal structure of the slide table of the present invention; Figure 6 This is a schematic diagram of the structure in Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the installation state of the cleaning needle plate and the sealing ring in Embodiment 2 of the present invention.

[0019] In the diagram: 1. Housing; 2. Battery; 3. Cover; 4. Socket; 5. Charging plug; 6. Blocking mechanism; 60. Mounting shell; 61. Limiting platform; 62. Card plate; 63. Limiting hole; 64. Lever; 65. Card slot; 7. Pressure relief mechanism; 70. Slide table; 71. Spring; 72. Outer shell; 73. Pressure relief hole; 74. Flame arrestor core; 8. Arc groove; 9. Arc strip; 10. Cleaning needle plate; 11. Telescopic cylinder; 12. Remote control switch; 13. Contact block; 14. Sealing ring. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] Example 1: Please refer to Figures 1-5An explosion-proof device for a counterbalanced forklift battery includes a housing 1, inside which a battery 2 is housed. A cover 3 is bolted to the upper opening of the housing 1. Sockets 4 are fixedly installed on both sides of the inside of the cover 3. The lower ends of the sockets 4 are electrically connected to the positive and negative terminals of the battery 2, respectively. Charging plugs 5 are electrically connected to the upper sides of the sockets 4. A blocking mechanism 6 is provided on the upper side of the cover 3, located on opposite sides of the sockets 4. The blocking mechanism 6 includes a mounting shell 60, a limiting platform 61, a locking plate 62, a limiting hole 63, a lever 64, and a slot 65. The mounting shell 60 is fixedly installed on the cover 3. On the upper side, the limiting platform 61 is fixedly installed at the bottom of the inner cavity of the mounting shell 60. A retaining plate 62 is slidably installed in the inner cavity of the mounting shell 60 above the limiting platform 61. The mounting shell 60 and the limiting platform 61 cooperate to restrict the retaining plate 62, so that the retaining plate 62 can only move left and right. A limiting hole 63 is opened on the upper side of the inner cavity of the mounting shell 60. A lever 64 is slidably engaged in the limiting hole 63. The lower end of the lever 64 is fixedly connected to the retaining plate 62. A slot 65 is opened on the position of the charging plug 5 facing the retaining plate 62. When the end of the retaining plate 62 facing the slot 65 is inserted into the slot 65, the axial displacement of the charging plug 5 is restricted.

[0022] In use, first connect and fix the two charging plugs 5 to the corresponding sockets 4 to charge the battery 2. Then, have the operator move the lever 64 and the locking plate 62 close to the charging plugs 5. Finally, have the locking plate 62 be inserted horizontally into the slot 65 of the charging plug 5. This action locks and fixes the charging plug 5, eliminating the arcing ignition source caused by accidentally unplugging the charging plug 5 during charging and preventing explosion. After the battery 2 is fully charged, have the operator reset the locking plate 62 and unplug the charging plug 5.

[0023] Please see Figures 1-5 The cover 3 is equipped with a pressure relief mechanism 7, which includes a slide 70, a spring 71, a housing 72, and a pressure relief hole 73. The slide 70 is slidably installed in the middle position of the cover 3. The lower side of the upper extension edge of the slide 70 and the upper side of the cover 3 are fixedly installed together with the spring 71. The outer side of the spring 71 is fitted with the housing 72. The lower side of the housing 72 is fixedly connected to the cover 3. The slide 70 is provided with a pressure relief hole 73. The pressure relief hole 73 is a T-shaped hole. The lower port of the pressure relief hole 73 is connected to the inner cavity of the housing 1. The upper port of the pressure relief hole 73 is opened on the arc-shaped side of the slide 70 and is connected to the external environment. When not charging, the uppermost part of the upper port of the pressure relief hole 73 is connected to the external environment.

[0024] When battery 2 is not in use or supplying power to a forklift, battery 2 will generate a small amount of gas (hydrogen). This gas will be discharged to the outside environment through the gap opened at the upper port of pressure relief hole 73 to prevent gas accumulation inside the box 1 and prevent explosion. When battery 2 is charging (normal charging or overcharging), the amount of gas generated increases. The gap at the upper port of pressure relief hole 73 cannot completely discharge the gas, causing the gas pressure inside the box 1 to drive the slide 70 to move upward and stretch the spring 71, thereby increasing the exposed area of ​​the upper port of pressure relief hole 73. This allows the gas inside the box 1 to be discharged from pressure relief hole 73. Through this action, excessive gas accumulation inside the box 1 is further avoided, reducing the probability of box 1 exploding. At the same time, there is a gap of millimeters between the upward-moving slide 70 and the end of the card plate 62 facing the slide 70, which blocks the reset path of the card plate 62, prevents the card plate 62 from being reset due to the influence of the external environment, and further locks and fixes the charging plug 5, eliminates the arcing ignition source of accidentally unplugging the charging plug 5 during charging, and prevents explosion. Once charging is complete, disconnect the power to the charging plug 5 to allow the gas inside the housing 1 to escape. This causes the spring 71 to move the slide 70 down, ensuring that the reset of the card plate 62 is unaffected. After that, reset the card plate 62 and unplug the charging plug 5.

[0025] Please see Figures 1-5 The pressure relief mechanism 7 also includes a flame arrestor core 74. The flame arrestor core 74 is fixedly installed inside the upper port of the pressure relief hole 73. The flame arrestor core 74 is a microporous sintered stainless steel flame arrestor core. The mating length of the sliding table 70 and the cover 3 is ≥25mm, the gap is ≤0.15mm, and the surface is plated with hard chrome to reduce friction (standard explosion-proof mating surface).

[0026] By setting the flame arrestor core 74 as described above, the function of allowing only gas to pass through and hydrogen to be discharged is achieved, while 100% blocking the flame from spreading outwards / backwards (the flame cannot pass through micropores smaller than its minimum extinguishing diameter, while gas molecules can pass through freely. If a deflagration occurs inside the chamber 1, the flame will rush into the flame arrestor core 74. Due to the extremely narrow micropores and numerous walls of the flame arrestor core 74, the flame is forced to dissipate heat and cool down rapidly, causing the temperature to drop below the ignition point, resulting in the flame being extinguished directly inside. External sparks, static electricity, and open flames can absolutely not penetrate into the chamber 1). The maximum experimental safety gap for hydrogen is approximately 0.29 mm. The gap between the sliding table 70 and the mating surface of the cover 3 is much smaller than the safety limit. Even if the chamber 1 explodes and the flames escape through the gap, they will be quickly extinguished by the wall surface, preventing the flames from spreading out. For a flame to travel from inside the housing 1 to the outside, it must travel a 25mm long path through a 0.15mm narrow gap. The longer the path, the more thorough the cooling, and the less likely the flame is to escape. The enclosure 1 contains acid mist, dust, and crystals. Ordinary metal surfaces are prone to rusting, scratching, and becoming rough. Once scratched, the gaps widen, leading to explosion-proof failure. Roughness can cause the slide 70 to jam, resulting in pressure relief failure. Hard chrome plating makes the surface of the slide 70 extremely smooth, reducing friction and preventing jamming. At the same time, hard chrome plating makes the surface of the slide 70 highly hard, preventing scratches and wear, ensuring that the gap is always ≤0.15mm. In addition, it makes the surface of the slide 70 resistant to acid mist corrosion, preventing the slide 70 from rusting for a long time, thus ensuring the explosion-proof performance remains stable for life.

[0027] Please see Figures 1-5 The slide table 70 has an arc-shaped groove 8 on its arc-shaped side. The arc-shaped groove 8 is connected to the upper port of the pressure relief hole 73. An arc-shaped strip 9 is inserted into the inside of the arc-shaped groove 8. There is a gap between the concave surface of the arc-shaped strip 9 and the corresponding side of the arc-shaped groove 8 (so that the pressure relief hole 73 is not blocked when venting). The middle position of the convex surface of the arc-shaped strip 9 is fixedly connected to the clamping plate 62. When the clamping plate 62 drives the arc-shaped strip 9 to disengage from the arc-shaped groove 8, there is a gap of millimeters between both ends of the concave surface of the arc-shaped groove 8 and the arc-shaped side of the slide table 70.

[0028] When battery 2 is not charged, the end of the card plate 62 facing the slide table 70 drives the arc-shaped strip 9 to extend into the arc-shaped groove 8 inside the slide table 70, which restricts the axial movement of the slide table 70. This makes the venting action of battery 2 strongly bound to the charging state. Only when all the charging preparation work is completed (charging plug 5 is inserted and card plate 62 locks charging plug 5) can the slide table 70 vent normally (micro-venting can operate normally). This completely avoids invalid or malfunctioning actions of the slide table 70 and prevents wear of the slide table 70 from causing it to lose its explosion-proof capability with the mating surface of the cover 3 (unexpected malfunction of the slide table 70 will cause the hard chrome plating layer of the explosion-proof mating surface to wear and be scratched quickly, causing the gap to exceed the standard and directly lose the explosion-proof capability. Once a combustion and explosion occurs inside the box, the flame will be sprayed out through the excessive gap, igniting the surrounding flammable and explosive environment. External open flames, welding sparks, and static sparks will also flow back into the box through the gap, igniting the accumulated hydrogen gas and directly detonating the box body 1). When the battery 2 is charging, the card plate 62 drives the arc strip 9 to extend out of the arc groove 8. At this time, the two ends of the arc strip 9 are on the outside of the slide table 70 and there is a small gap between them and the axial side of the slide table 70. This guides the slide table 70, ensuring that the slide table 70 can move linearly upward with pressure throughout its entire life cycle. The exhaust action is stable and controllable (when the slide table 70 moves vertically upward, it will not contact the concave surface of the arc strip 9. When the slide table 70 deflects slightly upward, it will be guided by the arc strip 9 and return to the vertical state, solving the problem of uneven wear and jamming of the slide table 70 after long-term use).

[0029] Example 2: Please refer to Figures 1-7A cleaning needle plate 10 is provided on the concave side of the arc-shaped strip 9 at the position corresponding to the flame arrestor core 74. The outer diameter of the needle of the cleaning needle plate 10 is smaller than the micropore diameter of the flame arrestor core 74.

[0030] During the process of the aforementioned card plate 62 driving the arc-shaped strip 9 into the arc-shaped groove 8, the needle body of the cleaning needle plate 10 is inserted into the micropore of the flame arrestor core 74, thereby removing the crystals and dust in the micropore of the flame arrestor core 74, restoring the designed air permeability of the flame arrestor core 74, and avoiding the poor exhaust during battery 2 charging, abnormal increase in internal pressure, and hydrogen concentration exceeding the lower explosive limit due to blockage of the flame arrestor core 74, thus reducing the risk of explosion from the root (when the needle body is inserted into the micropore at a constant speed, it will form a positive compression in the closed micropore channel, generating a small positive pressure airflow, which directly pushes the loose dust and crystal debris in the micropore channel forward and discharges them into the box 1 from the inside of the pressure relief hole 73, without leaving any residue in the micropore channel. When it is pulled out, a small negative pressure will be formed in the micropore channel, which will carry the remaining fine debris to the outside, achieving bidirectional blowing and cleaning without cleaning dead corners). Meanwhile, since the outer diameter of the needle plate 10 is smaller than the micropore diameter of the flame arrestor core 74, a small amount of gas generated when the battery 2 is in normal use (not charged) can be discharged from the position between the needle body and the micropore wall. In addition, although the axial displacement of the slide table 70 is limited by the interlocking of the arc strip 9 and the arc groove 8, the complex working environment of the forklift causes the slide table 70 to undergo slight axial displacement. This causes the flame arrestor core 74 to undergo slight axial displacement relative to the needle body. This causes the needle body to work with the micropore wall of the flame arrestor core 74 to radially compress the dust and crystals inside the micropore, causing the firmly attached impurities to break down. Then, when the needle body is pulled out, it is carried out by a slight negative pressure, thereby further restoring the designed air permeability of the flame arrestor core 74 and reducing the risk of explosion from the source.

[0031] Please see Figures 1-7 A storage groove is provided on the concave surface of the arc-shaped strip 9. The cleaning needle plate 10 is slidably installed in the storage groove. A telescopic cylinder 11 (the telescopic cylinder 11 is an electrically controlled cylinder) is fixedly installed inside the clamping plate 62. The telescopic rod of the telescopic cylinder 11 extends into the storage groove and is fixedly connected to the cleaning needle plate 10. A remote control switch 12 is fixedly installed on the side wall of the limiting hole 63 near the slide table 70. The remote control switch 12 is remotely connected to the telescopic cylinder 11. A contact block 13 is fixedly installed on the side of the lever 64 facing the slide table 70. When the contact block 13 contacts the remote control switch 12, the telescopic rod of the telescopic cylinder 11 extends. When the contact block 13 separates from the remote control switch 12, the telescopic rod of the telescopic cylinder 11 retracts and resets.

[0032] With the above settings, when the arc-shaped strip 9 is inserted into the arc-shaped groove 8, the contact block 13 contacts the remote control switch 12, causing the telescopic cylinder 11 to extend the cleaning needle plate 10 and insert the needle body into the micro-hole of the flame arrestor core 74 to achieve the cleaning operation. When the arc-shaped strip 9 is removed from the arc-shaped groove 8, the contact block 13 separates from the remote control switch 12, causing the telescopic rod of the telescopic cylinder 11 to drive the cleaning needle plate 10 into the storage groove, avoiding the cleaning needle plate 10 from affecting the axial movement of the slide table 70, so that the exhaust of the battery 2 is not affected.

[0033] Please see Figures 1-7 The needle body of the cleaning needle plate 10 has a tapered blunt tip design and is made of 316L stainless steel with a mirror-polished surface.

[0034] Thanks to the tapered blunt tip design of the needle, there are no burrs or hooks. Even if there is jamming, it can be smoothly pulled out with the movement of the arc strip 9 without breaking or leaving residue in the flow channel.

[0035] Please refer to the figure. The needle body of the cleaning needle plate 10 has an annular protrusion near the root. A sealing ring 14 is fixedly sleeved on the side of the annular protrusion facing the slide table 70. The sealing ring 14 is a miniature fluororubber sealing ring. A miniature venting notch of 0.1~0.2mm is axially opened inside the sealing ring 14.

[0036] When the needle is inserted into the micro-hole to complete the physical unblocking, the micro fluororubber sealing ring at the root will press the micro-hole opening tightly, so that the micro-slit forms a sealed cavity. Then, the needle continues to micro-displace and compress the cavity volume (the annular protrusion and the micro-hole opening together micro-compress the sealing ring 14), generating a directional inward positive pressure airflow, which powerfully blows the debris and crystals in the micro-hole of the flame arrestor core 74 into the box 1, avoiding blockage and greatly improving the self-cleaning effect. The micro exhaust notch is used to release the small amount of hydrogen gas generated by the self-discharge of battery 2. At the same time, when the sealing ring 14 presses against the outer opening of the micropore, the sealing ring 14 will undergo slight deformation, and the deformed part will enter the outer opening of the micropore. Afterwards, when the needle body moves radially relative to the micropore, the deformed part will buffer the needle body and prevent the needle body from making hard contact with the micropore wall.

Claims

1. An explosion-proof device for a counterbalanced forklift battery, comprising: A housing (1) is provided inside which a battery (2) is installed. A cover (3) is installed on the upper side of the housing (1). Sockets (4) are fixedly installed on both sides inside the cover (3). The lower ends of the sockets (4) are electrically connected to the positive and negative terminals of the battery (2), respectively. Charging plugs (5) are electrically connected to the upper sides of the sockets (4). The cover (3) is characterized in that a blocking mechanism (6) is provided on the upper side of the cover (3) at a position opposite to the sockets (4). The blocking mechanism (6) includes: Mounting housing (60) is fixedly installed on the upper side of the cover (3); The limiting platform (61) is fixedly installed at the bottom of the inner cavity of the mounting shell (60); The card plate (62) is slidably installed in the inner cavity of the mounting shell (60), and the mounting shell (60) cooperates with the limiting platform (61) to limit the card plate (62). The limiting hole (63) is located on the upper side inside the mounting shell (60); The lever (64) is slidably engaged in the limiting hole (63), and the lower end of the lever (64) is fixedly connected to the card plate (62); The slot (65) is provided at the position of the charging plug (5) facing the card plate (62). When the end of the card plate (62) facing the slot (65) is inserted into the slot (65), the axial displacement of the charging plug (5) is restricted. The inside of the cover (3) is provided with a pressure relief mechanism (7), and the upper side of the cover (3) is provided with an arc strip (9) and a cleaning needle plate (10). The pressure relief mechanism (7) is unblocked through the cleaning needle plate (10). The pressure relief mechanism (7) includes: The slide (70) is slidably installed in the middle position of the cover (3); A spring (71) is disposed between the lower side of the upper extension edge of the slide (70) and the upper side of the cover (3); The outer casing (72) is fitted on the outside of the spring (71), and the lower side of the outer casing (72) is fixedly connected to the cover (3); A pressure relief hole (73) is opened inside the slide (70). The pressure relief hole (73) is a T-shaped hole. The lower port of the pressure relief hole (73) is connected to the inner cavity of the housing (1). The upper port of the pressure relief hole (73) is opened on the arc-shaped side of the slide (70). When not charging, the uppermost part of the upper port of the pressure relief hole (73) is connected to the external environment. The pressure relief mechanism (7) also includes: The flame arrestor core (74) is fixedly installed inside the upper port of the pressure relief hole (73). The flame arrestor core (74) is a microporous sintered stainless steel flame arrestor core (74). The mating length of the sliding table (70) and the cover (3) is ≥25mm. The gap between the sliding table (70) and the cover (3) is ≤0.15mm. The mating surface is plated with hard chrome. The slide (70) has an arc groove (8) on its arc side. The arc groove (8) is connected to the upper port of the pressure relief hole (73). The arc strip (9) is inserted into the arc groove (8). There is a gap between the concave surface of the arc strip (9) and the corresponding side of the arc groove (8). The middle position of the convex surface of the arc strip (9) is fixedly connected to the clamping plate (62). When the clamping plate (62) drives the arc strip (9) to disengage from the arc groove (8), both ends of the concave surface of the arc groove (8) are spaced from the arc side of the slide (70) by millimeters.

2. The explosion-proof device for a counterbalanced forklift battery according to claim 1, characterized in that, The cleaning needle plate (10) is positioned on the concave side of the arc strip (9) corresponding to the flame arrester core (74), and the outer diameter of the needle of the cleaning needle plate (10) is smaller than the micropore diameter of the flame arrester core (74).

3. The explosion-proof device for a counterbalanced forklift battery according to claim 2, characterized in that, A storage groove is provided on the concave surface of the arc strip (9). The cleaning needle plate (10) is slidably installed in the storage groove. A telescopic cylinder (11) is fixedly installed inside the card plate (62). The telescopic rod of the telescopic cylinder (11) extends into the storage groove and is fixedly connected to the cleaning needle plate (10). A remote control switch (12) is fixedly installed on the side wall of the limiting hole (63) near the slide table (70). The remote control switch (12) is remotely connected to the telescopic cylinder (11). A contact block (13) is fixedly installed on the side of the lever (64) facing the slide table (70). When the contact block (13) contacts the remote control switch (12), the telescopic rod of the telescopic cylinder (11) extends. When the contact block (13) separates from the remote control switch (12), the telescopic rod of the telescopic cylinder (11) retracts and resets.

4. The explosion-proof device for a counterbalanced forklift battery according to claim 1, characterized in that, The needle body of the cleaning needle plate (10) is designed with a tapered blunt tip. The needle body is made of 316L stainless steel and the surface of the needle body is mirror polished.

5. The explosion-proof device for a counterbalanced forklift battery according to claim 3, characterized in that, The needle body of the cleaning needle plate (10) has an annular protrusion near the root. A sealing ring (14) is fixedly sleeved on the side of the annular protrusion facing the slide (70). The sealing ring (14) is a miniature fluororubber sealing ring. A miniature exhaust notch is axially opened inside the sealing ring (14).

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