Waste lithium battery recovery device with explosion-proof function

Abstract

The invention provides a waste lithium battery recovery device with an anti-explosion function, and relates to the technical field of waste lithium battery recovery. The waste lithium battery recovery device with the explosion-proof function comprises a double-layer box body structure and a box door, the box door is arranged at the upper end of the double-layer box body structure, the double-layer box body structure is composed of an outer box and an inner box, the outer box is made of 5 mm SPCC carbon steel, 3 mm SPCC reinforcing ribs are welded to the surface of the outer box, and the inner box is made of 5 mm SPCC carbon steel. And hasps are arranged on the surfaces of the openings of the double-layer box body structure and the box door. In the invention, the double-layer box body structure adopts a physical explosion-proof design of a carbon steel outer box (5mm SPCC) and a silicate inner box (40mm), and does not depend on an inert gas environment; the box body is locked through the six hasps with the clamping force larger than or equal to 34000 N, a sealed anti-explosion space is formed, an external gas supply system is not needed, inert gas continuous supply equipment and operation and maintenance cost are omitted, the deployment cost is reduced by 40% or above, a physical anti-explosion structure does not need complex gas circulation control, and the anti-explosion box is suitable for large-scale industrial application.

Description

Technical Field

[0001] The present invention relates to the technical field of waste lithium battery recycling, and specifically to a waste lithium battery recycling device with explosion-proof function. Background Art

[0002] With the popularization of new energy vehicles and electronic devices, the number of waste lithium batteries has increased sharply, and their recycling has become an important link in environmental protection and resource recycling. Currently, lithium battery recycling technologies mainly include physical disassembly, hydrometallurgy, and pyrometallurgy, etc. Among them, physical disassembly has become the mainstream due to its low pollution and high recovery rate. However, lithium batteries are prone to explosion due to short circuit, extrusion, or high temperature during disassembly, causing equipment damage and casualties.

[0003] Existing explosion-proof measures mainly include inert gas protection (such as nitrogen environment), explosion-proof shell design, and electrolyte pre-discharge treatment. For example: 1. Inert gas protection: Continuous gas supply is required, with high cost and complex operation, making it difficult to be applied on a large scale; 2. Explosion-proof shell: It can only suppress external impacts and cannot completely avoid the chain reaction caused by thermal runaway inside the battery; 3. Electrolyte pre-discharge: Long-term static placement is required, with low efficiency, and it cannot cope with the sudden short-circuit risk.

[0004] In addition, existing equipment mostly adopts multi-stage crushing and sorting technologies, but lacks a real-time monitoring and rapid response mechanism for the release of residual energy inside the battery, resulting in incomplete explosion-proof measures, high energy consumption, and long technological processes. Therefore, in the recycling of waste lithium batteries, a waste lithium battery recycling device with explosion-proof function is proposed to improve the explosion-proof effect, suppress thermal runaway, and improve efficiency. Summary of the Invention

[0005] 1. Technical Problems to be Solved In view of the deficiencies of the prior art, the present invention provides a waste lithium battery recycling device with explosion-proof function, which solves the problems raised in the background art.

[0006] 2. Technical Solutions To achieve the above objectives, the present invention is realized through the following technical solutions: A waste lithium battery recycling device with explosion-proof function, including a double-layer box structure and a box door. The box door is arranged at the upper end of the double-layer box structure. The double-layer box structure is composed of an outer box and an inner box. The outer box is made of 5mm SPCC carbon steel, and 3mm SPCC reinforcing ribs are welded on the surface of the outer box. Buckles are arranged on the surfaces of the openings of the double-layer box structure and the box door. There are six groups of buckles in total, and they are arranged in a U shape on the front side and the left and right sides of the double-layer box structure and the box door. The clamping force of a single buckle is ≥34000N. The inner box is made of 40mm silicate board, with a fire resistance rating of A1 level and having waterproof and moisture-proof functions. An inlet is arranged on the left side of the double-layer box structure, a drain outlet is arranged on the right side of the double-layer box structure, and a radar level gauge is arranged on the front side of the double-layer box structure. A pressure relief pipe and a pressure relief port (rated pressure 0.3MPa) are communicated and arranged at the upper end of the box door. A pressure relief valve (rated pressure 0.2MPa) is arranged on the surface of the pressure relief pipe. A ventilation pipe penetrates through the surface of the box door, and the pressure relief port is arranged inside the ventilation pipe. The pressure relief port is composed of a sealing strip, a die spring and a 3mm SPCC iron plate. The sealing strip is arranged on the upper surface of the ventilation pipe and cooperates with the 3mm SPCC iron plate. The die spring is fixedly connected between the ventilation pipe and the 3mm SPCC iron plate. A hydraulic strut is arranged between the box door and the double-layer box structure. The opening angle of the box door is 85°-90°. Both ends of the hydraulic strut are movably connected with U-shaped blocks. The upper U-shaped block is fixedly connected to the lower surface of the box door, and the lower U-shaped block is fixedly connected to the side surface of the double-layer box structure.

[0007] Through the above technical solution, the double-layer box structure adopts a physical explosion-proof design of a carbon steel outer box (5mm SPCC) and a silicate inner box (40mm), without relying on an inert gas environment; the box body is locked by 6 buckles with a clamping force ≥ 34000N to form a sealed explosion-proof space, without an external gas supply system, saving the continuous supply equipment and operation and maintenance costs of inert gas, and reducing the deployment cost by more than 40%. The physical explosion-proof structure does not require complex gas circulation control and is suitable for large-scale industrial applications. The silicate inner box (A1-level fireproof material, melting point ≥ 1000°C) isolates external fire sources and delays the conduction of internal heat (thermal conductivity ≤ 0.05W / (m·K)). An internal water cooling system (inject water through the national standard fire protection interface) quickly absorbs the explosion heat energy through the silicate inner box, cools down to below 100°C within 5 minutes. The silicate board blocks the heat diffusion, and the water cooling system directly absorbs the thermal runaway energy to prevent chain explosions, upgrading from passive shock resistance to "fire protection + cooling" dual active thermal management, with a 70% increase in the thermal runaway suppression efficiency. The temperature sensor monitors the internal state of the box in real time, and automatically triggers water injection for cooling when the temperature ≥ 100°C. The pressure sensor is linked with a pressure relief valve (0.2MPa) and a pressure relief port (0.3MPa) to quickly release energy. The waterproof and moisture-proof characteristics of the silicate inner box support direct water injection for cooling live batteries without pre-discharging, thus eliminating the pre-discharging and standing time. The single processing cycle is shortened to within 30 minutes, and the sensors and the automation system achieve millisecond-level response, capable of handling sudden faults such as short circuits and extrusion.

[0008] Furthermore, the pressure relief valve opens and closes automatically through a spring, and the pressure relief port is sealed by applying a pressure of 40 PSI through a die spring; Through the above technical solution, the pressure relief valve (spring-controlled) acts first at 0.2MPa to avoid pressure accumulation. The pressure relief port (sealed by a die spring) serves as the ultimate guarantee and mechanically releases at 0.3MPa, with a pre-tightening force design of 40 PSI (≈0.28MPa); precisely matching the lithium battery explosion pressure curve (the dangerous range of 0.25 - 0.35MPa), with a response accuracy 3 times higher than that of traditional rupture discs.

[0009] Furthermore, the waterproof performance of the inner box meets the IP67 standard, and the melting point ≥ 1000°C, and the thermal conductivity ≤ 0.05W / (m·K); Through the above technical solution, IP67 waterproofing enables: it can withstand immersion in 1-meter-deep water for 30 minutes without leakage risk during water injection cooling; ultra-high temperature tolerance: a melting point of 1000°C can resist lithium battery thermal runaway (usually 800°C), and a thermal conductivity ≤ 0.05W / (m·K) delays the temperature rise of the outer box by ≥ 15 minutes; structural stability: the deformation rate in a high-humidity environment is < 0.1%, and the impact resistance strength reaches 50J / cm².

[0010] Furthermore, the water inlet and the drain outlet adopt national standard fire-fighting connectors, supporting multi-caliber adaptation of DN50, DN65, and DN80. An inlet pipe is arranged inside the water inlet, and the inlet pipe is connected to the fire-fighting pipeline. A first solenoid valve is arranged on the surface of the inlet pipe. A drain pipe is arranged inside the drain outlet, and an outlet valve is arranged on the surface of the drain pipe; Through the above technical solution, multi-caliber adaptation design: DN50 / DN65 / DN80 cover 90% of the fire-fighting pipeline specifications, and the replacement time of the quick-release joint < 30 seconds; Precise control of the first solenoid valve: response time ≤ 100ms, flow regulation accuracy ±2L / min.

[0011] Furthermore, a wheel set is arranged at the lower end of the double-layer box structure. A brake pad is arranged on the side of the wheel set. Both the wheel set and the brake pad are arranged in four groups and are arranged in a rectangle at the lower end of the double-layer box structure. The load capacity of the wheel set ≥ 500kg / group, and the brake pad can prevent the device from displacing; Through the above technical solution, heavy-load moving ability: the total load of the four-wheel group is 2000kg, and the steering angle of the wheel set ≥ 270°; Safe braking design: the contact pressure of the brake pad ≥ 200N, 2mm thick wear-resistant ceramic coating; Anti-displacement performance: automatically lock when the slope is 15°, and the displacement under vibration conditions < 1mm.

[0012] Furthermore, a pressure sensor is arranged in the middle of the lower part of the box door. The pressure sensor is connected to the control system. When the pressure ≥ 0.2MPa, an alarm is triggered and the pressure relief valve is started to release the pressure. When the pressure ≥ 0.3MPa, the pressure relief port mechanically releases the pressure; Through the above technical solution, the pressure sensor detects the pressure fluctuation in the box at a sampling rate of 100Hz, especially monitors the key interval of 0 - 0.5MPa. The pressure relief valve automatically opens at 0.2MPa, and the pressure relief port mechanically releases at 0.3MPa; The pressure sensor is linked to the alarm system to prompt the operator to intervene.

[0013] Furthermore, a temperature sensor is arranged in the middle of the inner side wall of the double-layer box structure. The temperature sensor monitors the temperature in the box in real time and is linked to the first solenoid valve at the water inlet. When the temperature ≥ 100°C, water injection for cooling is automatically started. An overflow pipe is connected and arranged at the upper right end of the double-layer box structure. A second solenoid valve is arranged on the surface of the overflow pipe. The overflow pipe is located 10cm from the top of the side wall of the double-layer box structure. The second solenoid valve is signal-linked to the radar level gauge and automatically opens when the water level exceeds the set height; Through the above technical solution, the temperature sensor adopts infrared + contact dual-mode measurement, compares the temperature difference between the battery surface and the box sandwich. If the temperature ≥ 100°C, the first solenoid valve at the fire-fighting interface is powered on, and the water injection rate is 20L / min.

[0014] Applied to a waste lithium battery recycling device with explosion-proof function, it includes the following steps: S1: Open the box door to 85° - 90° through a hydraulic strut, and hoist the waste lithium battery into the inner box; S2: Close the box door and lock the box body with 6 large clamping force buckles; S3: Monitor the status inside the box through a pressure sensor and a temperature sensor; S4: When the pressure ≥ 0.2MPa, the pressure relief valve automatically opens; When the pressure ≥ 0.3MPa, the pressure relief port mechanically releases pressure; S5: If the temperature ≥ 100°C, the first solenoid valve starts to inject water, and the radar level gauge monitors the water level; S6: After treatment, discharge the wastewater through the drain port to complete the safe disassembly.

[0015] 3. Beneficial effects The present invention provides a waste lithium battery recycling device with explosion-proof function. It has the following beneficial effects: 1. The present invention provides a waste lithium battery recycling device with explosion-proof function. The double-layer box structure adopts a physical explosion-proof design of a carbon steel outer box (5mm SPCC) and a silicate inner box (40mm), without relying on an inert gas environment; the box body is locked by 6 buckles with a clamping force ≥ 34000N to form a sealed explosion-proof space, without an external gas supply system, saving the continuous supply equipment and operation and maintenance costs of inert gas, and reducing the deployment cost by more than 40%. The physical explosion-proof structure does not require complex gas circulation control and is suitable for large-scale industrial applications.

[0016] 2. The present invention provides a waste lithium battery recycling device with explosion-proof function. The silicate inner box (A1-level fireproof material, melting point ≥ 1000°C) isolates external fire sources and delays the internal heat conduction (thermal conductivity ≤ 0.05W / (m·K)). An internal water cooling system (injected with water through a national standard fire protection interface) is provided. The silicate inner box quickly absorbs the explosion heat energy and cools down to below 100°C within 5 minutes. The silicate board blocks the heat diffusion, and the water cooling system directly absorbs the thermal runaway energy to prevent chain explosions, upgrading from passive shock resistance to "fire prevention + cooling" dual active thermal management, and improving the thermal runaway suppression efficiency by 70%.

[0017] 3. The present invention provides a waste lithium battery recycling device with explosion-proof function. The temperature sensor monitors the internal state of the box in real time. When the temperature ≥ 100 °C, water injection for cooling is automatically triggered. The pressure sensor is linked with the pressure relief valve (0.2 MPa) and the pressure relief port (0.3 MPa) to quickly release energy. The waterproof and moisture-proof characteristics of the silicate inner box support direct water injection for cooling live batteries without pre-discharging, thus eliminating the pre-discharging and standing time. The single processing cycle is shortened to within 30 minutes, and the sensor and the automation system achieve millisecond-level response, capable of handling sudden failures such as short circuits and extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view three-dimensional structural schematic diagram of the open state of the box door of the present invention; Figure 2 It is a front view three-dimensional structural schematic diagram of the semi-open state of the box door of the present invention; Figure 3 It is a front view three-dimensional structural schematic diagram of the closed state of the box door of the present invention; Figure 4 It is a left view structural schematic diagram of the present invention; Figure 5 It is a front view three-dimensional structural schematic diagram of the inner box of the present invention; Figure 6 It is a structural schematic diagram of the inside of the pressure relief port of the present invention.

[0019] Wherein, 1. Double-layer box structure; 101. Outer box; 102. Inner box; 2. Reinforcing rib; 3. Buckle; 4. Water inlet; 5. Drainage port; 6. Radar level gauge; 7. Ventilation pipe; 8. Pressure relief pipe; 9. Pressure relief valve; 10. Box door; 11. Pressure relief port; 1101. Sealing strip; 1102. Die spring; 1103. 3mm SPCC iron plate; 12. Temperature sensor; 13. U-shaped block; 14. Hydraulic strut; 15. Water inlet pipe; 16. First solenoid valve; 17. Drain pipe; 18. Outlet valve; 19. Wheel set; 20. Brake pad; 21. Pressure sensor; 22. Overflow pipe; 23. Second solenoid valve. DETAILED DESCRIPTION OF THE INVENTION

[0020] Next, the technical solutions in the specific embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the specific embodiments of the present invention. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, rather than all of the specific embodiments. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Specific Embodiment 1: As Figure 1 , Figure 5 and Figure 6As shown, the specific embodiment of the present invention provides a waste lithium battery recycling device with explosion-proof function, including a double-layer box structure 1 and a box door 10, the box door 10 is arranged at the upper end of the double-layer box structure 1, the double-layer box structure 1 is composed of an outer box 101 and an inner box 102, the outer box 101 is 5mm SPCC carbon steel, and the surface of the outer box 101 is welded with 3mm SPCC reinforcement 2, the double-layer box structure 1 and the box door 10 are provided with buckles 3 on the surface of the openings, there are six groups of buckles 3, and they are U-shaped and arranged on the front and left and right sides of the double-layer box structure 1 and the box door 10, the clamping force of a single buckle 3 is ≥34000N, the inner box 102 is a 40mm silicate board, the fire resistance grade is A1, and it has waterproof and moisture-proof functions, a water inlet 4 is provided on the left side of the double-layer box structure 1, a drain port 5 is provided on the right side of the double-layer box structure 1, a radar level gauge 6 is provided on the front side of the double-layer box structure 1, a pressure relief pipe 8 and a pressure relief port 11 (rated pressure 0.3MPa) are connected at the upper end of the box door 10, a pressure relief valve 9 (rated pressure 0.2MPa) is provided on the surface of the pressure relief pipe 8, a ventilation pipe 7 is penetrated on the surface of the box door 10, the pressure relief port 11 is arranged inside the ventilation pipe 7, and the pressure relief port 11 is composed of a sealing strip 1101, a mold spring 1102 and a 3mm SPCC iron plate 1103, the sealing strip 1101 is arranged on the upper surface of the ventilation pipe 7 and cooperates with the 3mmSPCC iron plate 1103, the mold spring 1102 is fixedly connected between the ventilation pipe 7 and the 3mmSPCC iron plate 1103, a hydraulic support rod 14 is arranged between the box door 10 and the double-layer box structure 1, the opening angle of the box door 10 is 85°-90°, and both ends of the hydraulic support rod 14 are movably connected with U-shaped blocks 13, the upper end U-shaped block 13 is fixedly connected to the lower surface of the box door 10, and the lower end U-shaped block 13 is fixedly connected to the side of the double-layer box structure 1, and the double-layer box structure 1 adopts a carbon steel outer box 101 (5mm SPCC) and silicate inner box 102 (40mm) physical explosion-proof design, no need to rely on inert gas environment; through 6 buckles with clamping force ≥34000N 3 locking box, a sealed explosion-proof space is formed, no external gas supply system is required, eliminating the inert gas continuous supply equipment and operation and maintenance costs, and the deployment cost is reduced by more than 40%. The physical explosion-proof structure does not require complex gas circulation control and is suitable for large-scale industrial applications. The silicate inner box 102 (A1 grade fireproof material, melting point ≥1000℃) isolates external fire sources and delays internal heat conduction (thermal conductivity ≤0.05 W / m·K), built-in water cooling system (water injection according to national standard fire protection interface), quickly absorbs explosion heat energy through silicate inner box 102, cools down to below 100℃ within 5 minutes, silicate plate blocks heat diffusion, water cooling system directly absorbs thermal runaway energy to prevent chain explosion, upgrades from passive impact resistance to "fire protection + cooling" dual active thermal management, thermal runaway suppression efficiency increased by 70%, temperature sensor 12 monitors the status inside the box in real time, automatically triggers water injection for cooling when temperature ≥100℃, pressure sensor 21 links pressure relief valve 9 (0.2MPa) and pressure relief port 11 (0.(3 MPa), quickly release energy. The waterproof and moisture-proof characteristics of the silicate inner box 102 support direct water injection for cooling the charged battery without pre-discharging, thus eliminating the pre-discharge static time. The single processing cycle is shortened to within 30 minutes, and the sensor and the automation system achieve millisecond-level response, capable of handling sudden failures such as short circuits and extrusion.

[0022] As Figure 1 , Figure 5 and Figure 6 shown, the pressure relief valve 9 opens and closes automatically through a spring. The pressure relief port 11 is sealed by applying a pressure of 40 PSI through the die spring 1102. The waterproof performance of the inner box 102 meets the IP67 standard, and the melting point ≥ 1000 °C, the thermal conductivity ≤ 0.05 W / (m·K). The water inlet 4 and the drain outlet 5 adopt national standard fire-fighting connectors, supporting multi-diameter adaptation of DN50, DN65, and DN80. The water inlet pipe 15 is arranged inside the water inlet 4, and the water inlet pipe 15 is connected to the fire pipeline. The first solenoid valve 16 is arranged on the surface of the water inlet pipe 15. The drain pipe 17 is arranged inside the drain outlet 5, and the outlet valve 18 is arranged on the surface of the drain pipe 17. The pressure relief valve 9 (spring-controlled) acts first at 0.2 MPa to avoid pressure accumulation. The pressure relief port 11 (sealed by the die spring) is used as the ultimate guarantee and mechanically releases at 0.3 MPa, with a pre-tightening force design of 40 PSI (≈0.28 MPa); precisely matching the lithium battery explosion pressure curve (dangerous interval of 0.25 - 0.35 MPa), the response accuracy is 3 times higher than that of traditional rupture discs. The IP67 waterproofing is achieved: it can withstand immersion in 1-meter-deep water for 30 minutes without leakage risk during water injection cooling; ultra-high temperature tolerance: the melting point of 1000 °C can resist the thermal runaway of lithium batteries (usually 800 °C), and the thermal conductivity ≤ 0.05 W / (m·K) delays the temperature rise of the outer box by ≥ 15 minutes; structural stability: the deformation rate in a high-humidity environment is < 0.1%, and the impact resistance strength reaches 50 J / cm². The multi-diameter adaptation design: DN50 / DN65 / DN80 covers 90% of the fire pipeline specifications, and the replacement time of the quick-release joint is < 30 seconds; the precise control of the first solenoid valve 16: the response time ≤ 100 ms, and the flow rate adjustment accuracy is ±2 L / min.

[0023] As Figure 1 , Figure 5 and Figure 6As shown in the figure, a wheel set 19 is provided at the lower end of the double-layer box structure 1. A brake pad 20 is provided on the side of the wheel set 19. There are four groups of both the wheel set 19 and the brake pad 20, and they are arranged in a rectangle at the lower end of the double-layer box structure 1. The load capacity of the wheel set 19 is ≥500 kg / group. The brake pad 20 can prevent the device from displacing. A pressure sensor 21 is provided in the middle of the lower part of the box door 10. The pressure sensor 21 is connected to the control system. When the pressure ≥0.2 MPa, an alarm is triggered, and the pressure relief valve 9 is started to release the pressure. When the pressure ≥0.3 MPa, the pressure relief port 11 mechanically releases the pressure. A temperature sensor 12 is provided in the middle of the inner side wall of the double-layer box structure 1. The temperature sensor 12 monitors the temperature inside the box in real time and is linked with the first electromagnetic valve 16 at the water inlet 4. When the temperature ≥100 °C, water injection for cooling is automatically started. An overflow pipe 22 is connected and provided at the upper right end of the double-layer box structure 1. A second electromagnetic valve 23 is provided on the surface of the overflow pipe 22. The overflow pipe 22 is located 10 cm from the top of the side wall of the double-layer box structure 1. The second electromagnetic valve 23 is signal-linked with the radar level gauge 6 and is automatically opened when the water level exceeds the set height. Heavy-duty moving ability: The total load of the four-wheel group is 2000 kg, and the steering angle of the wheel set 19 is ≥270°; Safety braking design: The contact pressure of the brake pad 20 is ≥200 N, with a 2-mm-thick wear-resistant ceramic coating; Anti-displacement performance: Automatically locks when on a 15° slope, and the displacement under vibration conditions is <1 mm. The pressure sensor 21 detects the pressure fluctuation inside the box at a sampling rate of 100 Hz, especially monitors the key interval of 0 - 0.5 MPa. The pressure relief valve 9 automatically opens at 0.2 MPa, and the pressure relief port 11 mechanically releases the pressure at 0.3 MPa; The pressure sensor 21 is linked with the alarm system to prompt the operator to intervene. The temperature sensor 12 uses infrared + contact dual-mode measurement to compare the temperature difference between the battery surface and the box interlayer. If the temperature ≥100 °C, the first electromagnetic valve 16 of the fire-fighting interface is powered on, and the water injection rate is 20 L / min.

[0024] The embodiment of the present application also discloses a waste lithium battery recycling device with an explosion-proof function, which is applicable to the lithium battery recycling in the above, and the construction steps are as follows: S1: Open the box door 10 to 85° - 90° through the hydraulic strut 14, and hoist the waste lithium battery into the inner box 102; S2: Close the box door 10 and lock the box body through 6 large clamping force buckles 3; S3: Monitor the state inside the box through the pressure sensor 21 and the temperature sensor 12; S4: When the pressure ≥0.2 MPa, the pressure relief valve 9 automatically opens; When the pressure ≥0.3 MPa, the pressure relief port 11 mechanically releases the pressure; S5: If the temperature ≥100 °C, the first electromagnetic valve 16 starts water injection, and the radar level gauge 6 monitors the water level; S6: After treatment, the wastewater is discharged through the drain port 5 to complete the safe disassembly.

[0025] Working principle: After the hydraulic strut 14 opens the door 10 at an angle of 85 - 90°, the operator hoists the lithium battery pack to be processed into the inner box 102 of the silicate board by the robotic arm. When the door 10 is closed, the 6 latches 3 with a clamping force of 34000N lock in three stages in sequence, first diagonally and then peripherally, to form a sealed working space within 30 seconds. At this time, the pressure sensor 21 automatically resets to zero, and the temperature sensor 12 starts baseline monitoring; the pressure sensor 21 detects the pressure fluctuation in the box at a sampling rate of 100Hz, especially monitoring the critical range of 0 - 0.5MPa. The temperature sensor 12 uses a dual-mode measurement of infrared + contact type to compare the temperature difference between the battery surface and the box sandwich. If the temperature ≥ 100°C, the first solenoid valve 16 of the fire interface is energized, and the water injection rate is 20L / min. The radar level gauge 6 scans the reference water level every 5 seconds, with a measurement accuracy of ±1mm; the pressure relief valve 9 automatically opens at 0.2MPa, and the pressure relief port 11 mechanically releases at 0.3MPa; the pressure sensor 21 is linked to the alarm system to prompt the operator to intervene; when the water cooling system is working, the 40mm silicate board plays a key role. Its low thermal conductivity of 0.05W / m·K keeps the temperature of the outer box 101 below 60°C, and its waterproof property ensures no leakage at a water depth of 30cm. During the water injection process, the radar level gauge 6 dynamically adjusts the flow rate to keep the water level in the optimal range of 30 ± 2cm; when the treatment is completed, the pressure sensor 21 confirms that the pressure in the box returns to normal pressure ±5% of the atmospheric pressure, and the temperature sensor 12 continuously monitors until the battery pack cools down to below 40°C, and then drains the water through the drain valve.

[0026] Although the specific embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these specific embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste lithium battery recycling device with explosion-proof function, comprising a double-layer box structure (1) and a box door (10), characterized in that: The box door (10) is arranged at the upper end of the double-layer box structure (1), and the double-layer box structure (1) is composed of an outer box (101) and an inner box (102). The outer box (101) is made of 5mm SPCC carbon steel, and 3mm SPCC reinforcing ribs (2) are welded on the surface of the outer box (101). Buckles (3) are arranged on the surfaces at the openings of the double-layer box structure (1) and the box door (10). A total of six groups of buckles (3) are provided, and they are arranged in a U shape on the front side and the left and right sides of the double-layer box structure (1) and the box door (10). The clamping force of a single buckle (3) is ≥34000N. The inner box (102) is made of 40mm silicate board, with a fire resistance rating of A1 level and having the functions of waterproof and moisture-proof. An inlet (4) is arranged on the left side of the double-layer box structure (1), a drain outlet (5) is arranged on the right side of the double-layer box structure (1), and a radar level gauge (6) is arranged on the front side of the double-layer box structure (1). A pressure relief pipe (8) and a pressure relief port (11) (rated pressure 0.3MPa) are communicated and arranged at the upper end of the box door (10). A pressure relief valve (9) (rated pressure 0.2MPa) is arranged on the surface of the pressure relief pipe (8). A ventilation pipe (7) penetrates through the surface of the box door (10), and the pressure relief port (11) is arranged inside the ventilation pipe (7). The pressure relief port (11) is composed of a sealing strip (1101), a die spring (1102) and a 3mm SPCC iron plate (1103). The sealing strip (1101) is arranged on the upper surface of the ventilation pipe (7) and cooperates with the 3mm SPCC iron plate (1103). The die spring (1102) is fixedly connected between the ventilation pipe (7) and the 3mm SPCC iron plate (1103). A hydraulic strut (14) is arranged between the box door (10) and the double-layer box structure (1). The opening angle of the box door (10) is 85°-90°. Both ends of the hydraulic strut (14) are movably connected with U-shaped blocks (13). The upper U-shaped block (13) is fixedly connected to the lower surface of the box door (10), and the lower U-shaped block (13) is fixedly connected to the side surface of the double-layer box structure (1).

2. The waste lithium battery recycling device with explosion-proof function according to claim 1, characterized in that: The pressure relief valve (9) is automatically opened and closed by a spring, and the pressure relief port (11) is sealed by applying a pressure of 40PSI through the die spring (1102).

3. The recycling device for waste lithium batteries with explosion-proof function according to claim 1, characterized in that: The waterproof performance of the inner box (102) meets the IP67 standard, and its melting point ≥1000℃, and its thermal conductivity ≤0.05W / (m·K).

4. The recycling device for waste lithium batteries with explosion-proof function according to claim 1, wherein: The inlet (4) and the drain outlet (5) adopt national standard fire-fighting connectors, support multi-caliber adaptation of DN50, DN65, and DN80. An inlet pipe (15) is arranged inside the inlet (4), and the inlet pipe (15) is connected to a fire-fighting pipeline. A first solenoid valve (16) is arranged on the surface of the inlet pipe (15). A drain pipe (17) is arranged inside the drain outlet (5), and an outlet valve (18) is arranged on the surface of the drain pipe (17).

5. The recycling device for waste lithium batteries with explosion-proof function according to claim 1, wherein: The lower end of the double-layer box structure (1) is provided with a wheel set (19), and a brake pad (20) is arranged on the side of the wheel set (19). Both the wheel set (19) and the brake pad (20) are provided with four groups and are arranged in a rectangle at the lower end of the double-layer box structure (1). The load capacity of the wheel set (19) is ≥500 kg / group, and the brake pad (20) can prevent the device from displacing.

6. The recycling device for waste lithium batteries with explosion-proof function according to claim 1, wherein: In the middle of the lower part of the box door (10), a pressure sensor (21) is provided. The pressure sensor (21) is connected to the control system. When the pressure ≥0.2 MPa, an alarm is triggered and the pressure relief valve (9) is activated to release the pressure. When the pressure ≥0.3 MPa, the pressure relief port (11) mechanically releases the pressure.

7. The recycling device for waste lithium batteries with explosion-proof function according to claim 1, wherein: In the middle of the inner side wall of the double-layer box structure (1), a temperature sensor (12) is provided. The temperature sensor (12) monitors the temperature inside the box in real time and is linked with the first solenoid valve (16) at the water inlet (4). When the temperature ≥100 °C, water injection for cooling is automatically started. The upper right end of the double-layer box structure (1) is connected and provided with an overflow pipe (22). A second solenoid valve (23) is arranged on the surface of the overflow pipe (22). The overflow pipe (22) is located 10 cm from the top of the side wall of the double-layer box structure (1). The second solenoid valve (23) is signal-linked with the radar level gauge (6) and is automatically opened when the water level exceeds the set height.

8. An explosion-proof waste lithium battery recycling device applied to the one described in claims 1-7, characterized in that, It includes the following steps: S1: Open the box door (10) to 85° - 90° through the hydraulic strut (14), and hoist the waste lithium battery into the inner box (102); S2: Close the box door (10) and lock the box body through 6 large clamping force buckles (3); S3: Monitor the state inside the box through the pressure sensor (21) and the temperature sensor (12); S4: When the pressure ≥0.2 MPa, the pressure relief valve (9) automatically opens; When the pressure ≥0.3 MPa, the pressure relief port (11) mechanically releases the pressure; S5: If the temperature ≥100 °C, the first solenoid valve (16) starts water injection, and the radar level gauge (6) monitors the water level; S6: After treatment, discharge the waste water through the drain port (5) to complete the safe dismantling.

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