Extrusion type material injection device and material injection method for lithium battery black powder flash evaporation

Abstract

The invention provides an extrusion type material injection device and method for lithium battery black powder flash evaporation, the device comprises a feeding cylinder, a piston and a hydraulic device, a discharging port of the feeding cylinder is connected with a feeding port of flash evaporation equipment, and the discharging port of the feeding cylinder is connected with a feeding valve; the piston is inserted into the feeding port of the feeding cylinder in the vertical direction, when the piston is inserted into the feeding cylinder, the piston slides in the feeding cylinder in the vertical direction, the piston is provided with a gas inlet channel and a gas outlet channel, the upper portion of the gas inlet channel is connected with a nitrogen gas source, and the lower portion of the gas inlet channel and the lower portion of the gas outlet channel are both communicated with the cavity. The exhaust channel is connected with a nitrogen concentration sensor; the hydraulic device is connected to the upper end of the piston so as to drive the piston to move in the vertical direction. Nitrogen replacement can be carried out in the material injection process, air is prevented from entering flash evaporation equipment, the production efficiency is improved, and consumption of a nitrogen source is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of flash evaporation technology for lithium battery black powder, and in particular to an extrusion-type injection device and injection method for flash evaporation of lithium battery black powder. Background Technology

[0002] When recycling spent lithium batteries, the black powder on the electrodes can be recycled and reused. Valuable metals such as lithium, cobalt, and nickel can be extracted from the black powder for use in the production of new energy battery materials. During the recycling process, the black powder needs to be flash-pyrolyzed in a nitrogen atmosphere. However, when loading the flash pyrolysis device, external air is often introduced, requiring vacuuming and nitrogen purging, making the operation cumbersome, reducing production efficiency, and causing significant waste of nitrogen. Summary of the Invention

[0003] The purpose of this invention is to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide an extrusion-type injection device and method for flash evaporation of lithium battery black powder, which allows for nitrogen purging during the injection process to prevent air from entering the flash evaporation equipment.

[0004] One embodiment of the present invention provides an extrusion-type injection device for flash evaporation of lithium battery black powder, comprising: a feeding cylinder, a piston, and a hydraulic device. The feeding cylinder has a chamber inside, with a feeding port at the top and a discharging port at the bottom. The discharging port of the feeding cylinder is connected to the feeding port of the flash evaporation equipment, and a feeding valve is connected to the discharging port of the feeding cylinder. The piston is inserted vertically into the feeding port of the feeding cylinder. When the piston is inserted into the feeding cylinder, it slides vertically within the feeding cylinder. The piston has an air inlet channel and an air outlet channel. The upper part of the air inlet channel is connected to a nitrogen gas source, and the lower parts of both the air inlet channel and the air outlet channel are connected to the chamber. A nitrogen concentration sensor is connected to the air outlet channel. The hydraulic device is connected to the upper end of the piston to drive the piston to move vertically.

[0005] In some embodiments, the extrusion injection device further includes a filter device having an air inlet and an air outlet, the air inlet of the filter device being connected above the air outlet passage.

[0006] In some embodiments, the intake channel is fixedly connected to the intake pipe, the upper end of the intake pipe is connected to a nitrogen source through a first flexible hose, the exhaust channel is fixedly connected to the exhaust pipe, the upper end of the exhaust pipe is connected to a filter device through a second flexible hose, and control valves are respectively connected to the first flexible hose and the second flexible hose.

[0007] In some embodiments, the first hose is detachably connected to the intake pipe, and the second hose is detachably connected to the exhaust pipe.

[0008] In some embodiments, the nitrogen concentration sensor is connected to a second flexible tube.

[0009] In some embodiments, the hydraulic device includes a hydraulic cylinder and a cylinder rod connected together. The cylinder rod extends vertically downwards, and a telescopic rod is fixedly connected to the lower end of the cylinder rod. A piston is fixedly connected to the lower end of the telescopic rod.

[0010] In some embodiments, the telescopic rod is fixedly connected to the center of the piston, and the intake passage and exhaust passage are respectively located on both sides of the telescopic rod.

[0011] In some embodiments, the inner side of the feed inlet of the feed cylinder is chamfered or rounded.

[0012] In some embodiments, the feed valve is a solenoid valve.

[0013] Another embodiment of the present invention proposes an extrusion injection method for flash evaporation of lithium battery black powder, which utilizes the above-mentioned extrusion injection device and includes the following steps: When the feed valve is closed, the hydraulic device drives the piston to move upward until it is separated from the feed cylinder, and feeds the lithium battery black powder into the feed cylinder. The hydraulic device drives the piston downward until it is inserted into the feed cylinder, and continues to drive the piston downward to discharge the air in the feed cylinder through the exhaust channel. When the piston moves downward to the limit point, nitrogen is injected into the feed cylinder to displace the air in the feed cylinder. When the nitrogen concentration sensor in the exhaust channel detects that the nitrogen concentration has risen to the maximum value and the concentration value no longer changes, the feed valve is opened to transport the lithium battery black powder to the flash evaporation equipment. After the lithium battery black powder in the feed cylinder is completely fed into the flash evaporation equipment, close the feed valve, stop injecting nitrogen, and wait for the next feed. Attached Figure Description

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings. in: Figure 1 This is a schematic diagram of the extrusion-type injection device for flash evaporation of lithium battery black powder according to an embodiment of the present invention; Figure label: 1. Nitrogen gas source; 2. Telescopic rod; 3. Inlet pipe; 4. Piston; 5. Feed cylinder; 6. Feed valve; 7. Nitrogen concentration sensor; 8. Filter device; 9. Exhaust pipe; 10. Flash evaporation equipment. Detailed Implementation

[0015] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0016] The following description, with reference to the accompanying drawings, describes an extrusion-type injection device and injection method for flash evaporation of lithium battery black powder according to embodiments of the present invention.

[0017] like Figure 1 As shown, one embodiment of the present invention proposes an extrusion-type injection device for flash evaporation of lithium battery black powder, comprising: a feeding cylinder 5, a piston 4, and a hydraulic device. The feeding cylinder 5 has a chamber inside, with an inlet at the top and an outlet at the bottom. The outlet is connected to the inlet of the flash evaporation device 10, and a feeding valve 6 is connected to the outlet. The piston 4 is inserted and removed vertically into the inlet of the feeding cylinder 5. When the piston 4 is inserted into the feeding cylinder 5, it slides vertically within the feeding cylinder 5. The piston 4 has an air inlet channel and an exhaust channel. The upper part of the air inlet channel is connected to a nitrogen source 1, and the lower parts of both the air inlet channel and the exhaust channel are connected to the chamber. A nitrogen concentration sensor 7 is connected to the exhaust channel. The hydraulic device is connected to the upper end of the piston 4 to drive the piston 4 to move vertically.

[0018] In this embodiment of the invention, by setting up a feeding cylinder 5, a piston 4, a hydraulic device, a feeding valve 6 and a nitrogen source 1, nitrogen replacement can be performed during the material injection process to prevent air from entering the flash evaporation equipment 10, thereby improving production efficiency and significantly reducing the consumption of nitrogen source 1.

[0019] In some embodiments, the extrusion injection device further includes a filter device 8, which has an air inlet and an air outlet. The air inlet of the filter device 8 is connected to the top of the exhaust channel. This prevents the black powder dust from being released into the atmosphere during the exhaust process. Moreover, after the black powder is intercepted by the filter screen, the filter screen can be removed and the black powder can be recycled.

[0020] In some embodiments, the intake channel is fixedly connected to the intake pipe 3, and the upper end of the intake pipe 3 is connected to the nitrogen source 1 through a first flexible hose. The exhaust channel is fixedly connected to the exhaust pipe 9, and the upper end of the exhaust pipe 9 is connected to the filter device 8 through a second flexible hose. Control valves are respectively connected to the first flexible hose and the second flexible hose. By providing flexible hoses, the piston 4 can move up and down without obstruction.

[0021] In some embodiments, the first hose is detachably connected to the intake pipe 3, and the second hose is detachably connected to the exhaust pipe 9.

[0022] Furthermore, the first hose can be connected to the intake pipe 3 and the second hose can be connected to the exhaust pipe 9 by plugging in, and the plugging in is equipped with a rubber sealing sleeve.

[0023] In some embodiments, the nitrogen concentration sensor 7 is connected to the second flexible tube.

[0024] In some embodiments, the hydraulic device includes a connected hydraulic cylinder and a cylinder rod, the cylinder rod extending vertically downwards, the lower end of the cylinder rod being fixedly connected to a telescopic rod 2, and the lower end of the telescopic rod 2 being fixedly connected to a piston 4.

[0025] In some embodiments, the telescopic rod 2 is fixedly connected to the center of the piston 4, and the intake passage and exhaust passage are respectively located on both sides of the telescopic rod 2.

[0026] In some embodiments, the inner side of the feed inlet of the feed cylinder 5 is chamfered or rounded. This facilitates the insertion of the piston 4 into the feed cylinder 5.

[0027] In some embodiments, the feed valve 6 is a solenoid valve.

[0028] Another embodiment of the present invention proposes an extrusion injection method for flash evaporation of lithium battery black powder, which utilizes the above-mentioned extrusion injection device and includes the following steps: When the feed valve 6 is closed, the hydraulic device drives the piston 4 to move upward until it is separated from the feed cylinder 5, and feeds the lithium battery black powder into the feed cylinder 5. The hydraulic device drives the piston 4 downward until it is inserted into the feed cylinder 5, and continues to drive the piston 4 downward to discharge the air in the feed cylinder 5 through the exhaust channel. When piston 4 moves downward to the limit position, nitrogen is injected into the feed cylinder 5 to displace the air in the feed cylinder 5. When the nitrogen concentration sensor 7 in the exhaust channel detects that the nitrogen concentration has risen to the maximum value and the concentration value no longer changes, the feed valve 6 is opened to transport the lithium battery black powder to the flash evaporation equipment 10. After the lithium battery black powder in the feed cylinder 5 is completely fed into the flash evaporator 10, the feed valve 6 is closed, the nitrogen injection is stopped, and the machine waits for the next feed.

[0029] In this embodiment of the invention, by setting up a feeding cylinder 5, a piston 4, a hydraulic device, a feeding valve 6 and a nitrogen source 1, nitrogen replacement can be performed during the material injection process to prevent air from entering the flash evaporation equipment 10, thereby improving production efficiency and significantly reducing the consumption of nitrogen source 1.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An extrusion injection device for lithium battery black powder flash, characterized in that, The device comprises: a feeding cylinder, the inside of which has a chamber, the upper part of the chamber is a feeding port, the bottom of the chamber is a discharging port, the discharging port of the feeding cylinder is connected with the feeding port of the flash evaporation equipment, and a feeding valve is connected at the discharging port of the feeding cylinder; a piston which is inserted into the feeding port of the feeding cylinder in the vertical direction, the piston slides in the vertical direction in the feeding cylinder when the piston is inserted into the feeding cylinder, the piston has an air inlet channel and an air outlet channel, the upper part of the air inlet channel is connected with a nitrogen source, the lower part of the air inlet channel and the lower part of the air outlet channel are both connected with the chamber, and the air outlet channel is connected with a nitrogen concentration sensor; a hydraulic device which is connected with the upper end of the piston to drive the piston to move in the vertical direction.

2. The extrusion injection device for lithium battery black powder flash evaporation according to claim 1, characterized in that, The device further comprises a filtering device which has an air inlet port and an air outlet port, and the air inlet port of the filtering device is connected with the upper part of the air outlet channel.

3. The extrusion injection device for lithium battery black powder flash according to claim 2, characterized in that, The air inlet channel is fixedly connected with an air inlet pipe, the upper end of the air inlet pipe is connected with the nitrogen source through a first hose, the air outlet channel is fixedly connected with an air outlet pipe, and the upper end of the air outlet pipe is connected with the filtering device through a second hose, and the control valves are respectively connected with the first hose and the second hose.

4. The extrusion injection device for lithium battery black powder flash according to claim 3, characterized in that, The first hose and the air inlet pipe are detachably connected, and the second hose and the air outlet pipe are detachably connected.

5. The extrusion injection device for lithium battery black powder flash according to claim 3, wherein, The nitrogen concentration sensor is connected with the second hose.

6. The extrusion injection device for lithium battery black powder flash according to claim 1, wherein, The hydraulic device comprises a hydraulic cylinder and a cylinder rod which are connected, the cylinder rod vertically extends downward, the lower end of the cylinder rod is fixedly connected with an extension rod, and the lower end of the extension rod is fixedly connected with the piston.

7. The extrusion-type material injection device for lithium battery black powder flash evaporation according to claim 6, characterized in that, The extension rod is fixedly connected with the center of the piston, and the air inlet channel and the air outlet channel are respectively arranged on the two sides of the extension rod.

8. The extrusion injection device for lithium battery black powder flash evaporation according to claim 1, characterized in that, The inner side of the feeding port of the feeding cylinder is chamfered or rounded.

9. The extrusion injection device for lithium battery black powder flash evaporation according to claim 1, characterized in that, The feeding valve is an electromagnetic valve.

10. An extrusion injection method for lithium battery black powder flash, characterized in that, The extrusion type feeding device according to any one of claims 1-9 comprises the following steps: the feeding valve is closed, the hydraulic device drives the piston to move upward until the piston is separated from the feeding cylinder, and the lithium battery black powder is fed into the feeding cylinder; the hydraulic device drives the piston to move downward until the piston is inserted into the feeding cylinder, and continues to drive the piston to move downward to discharge the air in the feeding cylinder outward through the air outlet channel; when the piston moves downward to a limiting point, nitrogen is injected into the feeding cylinder to displace the air in the feeding cylinder, when the nitrogen concentration sensor of the air outlet channel monitors that the nitrogen concentration rises to the maximum value and the concentration value no longer changes, the feeding valve is opened, and the lithium battery black powder is transported into the flash evaporation equipment; after the lithium battery black powder in the feeding cylinder is completely fed into the flash evaporation equipment, the feeding valve is closed, the injection of nitrogen is stopped, and the next feeding is waited.

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