A linear recovery device and method for lithium battery electrolyte controlled by optical-mechanical-electrical linkage

Abstract

The present invention discloses a linear recovery device and method for lithium battery electrolyte controlled by optical-mechanical-electric linkage, and relates to the technical field of lithium battery recovery. The present invention places an exposed core lithium battery on a shelf, introduces the exposed core lithium battery on the shelf into a recovery device, first injects a sufficient amount of dry airflow into the extraction chamber through a dry airflow device, and then repeatedly pressurizes and depressurizes the transformer chamber through an air pressure regulating device, repeatedly "squeezes" the dry airflow into the gaps of the positive and negative electrode winding materials of the exposed core lithium battery, so that the "dry" airflow fully contacts the positive and negative electrode winding materials of the exposed core lithium battery, and gradually "takes away" the electrolyte components attached to the positive and negative electrode winding materials. After multiple sufficient contacts, the volume of the extraction chamber is expanded to the maximum extent, so that the volume of the shelf and the exposed core lithium battery accounts for the minimum, and then the airflow containing a large amount of electrolyte components in the extraction chamber is discharged, and the electrolyte attached to the positive and negative electrode winding materials in the exposed core lithium battery is effectively "extracted".

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery recycling, and in particular to a linear recycling device and method for lithium battery electrolyte controlled by optical-mechanical-electrical linkage. Background Art

[0002] Lithium battery recycling is now a very common industrial recycling industry. When recycling lithium batteries, the recycling of the more valuable electrolyte is the key business of many lithium battery recycling companies.

[0003] When recycling lithium battery electrolyte, many recycling companies often directly use the crushing method for recycling, that is, the waste lithium-ion batteries are crushed under a nitrogen atmosphere, centrifuged at high speed, and the electrolyte is separated from the battery in liquid form, so as to achieve the purpose of recycling and reuse. In this recycling process, the content of various metals, impurities, etc. is very high, and the process operation is complicated and the recovery rate is low.

[0004] In the structure of many lithium batteries, the electrolyte is often attached to the positive and negative electrode core materials of the lithium battery. As long as most of the electrolyte attached to the positive and negative electrode core materials of the lithium battery are "extracted", the benefits of electrolyte recovery are basically achieved. However, the direct "extraction" of electrolyte mainly adopts the supercritical extraction method: the waste lithium-ion battery is placed in a supercritical reactor, and the electrolyte in the battery is extracted with supercritical CO. In the collection kettle, supercritical CO is restored to normal pressure to precipitate the electrolyte. This method is green and environmentally friendly and does not destroy the molecular structure of the electrolyte, but the process is complex, the conditions are harsh, and the cost is high. Obviously, this method does not achieve good industrial benefits when directly "extracting" the electrolyte.

[0005] In summary, how to overcome the problems existing in the direct "extraction" and recovery of electrolyte during the recycling of lithium batteries has become a difficult problem. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a linear recovery device and method for lithium battery electrolyte controlled by optomechanical linkage, so as to effectively "extract" the electrolyte attached to the positive and negative electrode winding materials in the exposed core lithium battery.

[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] The present invention provides a linear recovery device for lithium battery electrolyte controlled by optical-mechanical-electrical linkage, the recovery device comprising: a device housing, two piston plates located in the inner cavity of the device housing, a withdrawal cavity located between the two piston plates, and a transformer cavity located between the piston plate and the device housing. Among them, both side plates of the device housing are provided with installation sockets connected to the withdrawal cavity, a shelf is inserted at the installation socket position, a plurality of evenly distributed slots are provided on the shelf, and airflow openings are provided on both sides of each slot, and the pre-cut exposed core lithium battery is placed at the slot position, and the cutting positions at both ends of the exposed core lithium battery are just opposite to the airflow openings.

[0009] One side plate of the device shell is equipped with two dry air flow pipes connected to the extraction chamber, and the dry air flow pipes are connected to the dry air flow equipment. The other side plate of the device shell is equipped with two extraction exhaust pipes connected to the extraction chamber, and the extraction exhaust pipes are connected to the gas collection equipment. The device shell is also equipped with an air pressure regulating pipe connected to the pressure transformer chamber, and the air pressure regulating pipe is connected to the air pressure regulating equipment. The device shell is equipped with a photoelectric distance monitoring module for monitoring the moving position of the piston plate, and the device shell is equipped with an air pressure monitoring module for monitoring the air pressure in the pressure transformer chamber. The periphery of the device shell is equipped with two servo rotating mechanisms symmetrically distributed along the device shell, and the output end of the servo rotating mechanism is fixedly connected to the rotating arm, and the end of the rotating arm is fixedly installed with a blocking end cover for sealing the installation socket.

[0010] As a preferred technical solution of the device of the present invention: two airflow inlet pipes are provided on one side of the device housing, the airflow inlet pipes are connected to the drying airflow pipe, and the airflow inlet pipes are equipped with a first solenoid valve. Two airflow outlet pipes are provided on one side of the device housing, the airflow outlet pipes are connected to the extraction and discharge pipe, and the airflow outlet pipes are equipped with a second solenoid valve.

[0011] As a preferred technical solution of the device of the present invention: the airflow introduction pipes are symmetrically distributed on both sides of the shelf, and the airflow outlet pipes are symmetrically distributed on both sides of the shelf.

[0012] As a preferred technical solution of the device of the present invention: the device shell is provided with an air pressure connecting pipe communicating with the pressure changing chamber, and the air pressure regulating pipe is connected to the air pressure connecting pipe.

[0013] As a preferred technical solution of the device of the present invention: a piston ring is provided on the piston plate ring side, and the piston ring is in sliding and extrusion contact with the inner wall of the device housing.

[0014] As a preferred technical solution of the device of the present invention: the opening width of the air flow opening is smaller than the width of the slot.

[0015] As a preferred technical solution of the device of the present invention: a sealing gasket matching with the installation socket is arranged on a side of the sealing end cover facing the installation socket.

[0016] The present invention provides a linear recovery method of lithium battery electrolyte controlled by optical-mechanical-electrical linkage, comprising the following contents:

[0017] In the first step, the pre-cut exposed-core lithium battery is inserted into the slot position of the shelf by a robot device. When inserting, the exposed core part of the exposed-core lithium battery is facing the air flow opening.

[0018] In the second step, the shelf rack fully loaded with exposed core lithium batteries is inserted into the installation socket position of the device shell. The servo rotation mechanism on both sides of the device shell drives the sealing end caps. The sealing end caps on both sides of the device shell adjust the placement of the shelf rack, and the sealing end caps seal the installation sockets on both sides of the device shell.

[0019] In the third step, the dry air flow device injects dry air flow into the extraction chamber through the dry air flow pipe until the piston plate distance monitored by the two photoelectric distance monitoring modules is less than L min When the dry air flow pipe is closed, the dry air flow device stops outputting air flow.

[0020] In the fourth step, two air pressure regulating devices inject air flow through the air pressure regulating pipe to increase the air pressure in the pressure changing chamber, and the piston plate continues to approach the shelf.

[0021] Step 5: When the piston plate distances detected by the two photoelectric distance monitoring modules are both greater than L max When the pressure is reduced, the two air pressure regulating devices begin to reduce the pressure in the pressure transformer chamber, and the piston plate continues to move away from the shelf.

[0022] Step 6: When the distance between the piston plates detected by the two photoelectric distance monitoring modules is less than L min When the two air pressure regulating devices are pressurized again, the air pressure in the pressure changing chamber is increased, and the piston plate continues to approach the shelf.

[0023] Step 7. Repeat steps 4 to 6, and pressurize the transformer chamber no less than M times, M ≥ 3.

[0024] Step 8: After the last decompression of the transformer chamber is completed, the extraction discharge pipe is opened, and the gas collection device continues to extract the gas in the extraction chamber until the piston plate distance monitored by the two photoelectric distance monitoring modules is greater than L. max When the gas collection device stops pumping, the exhaust pipe is closed.

[0025] Step 9. Repeat steps 3 to 8 K times, where K ≥ 3.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention preliminarily performs core-exposing cutting on lithium batteries, places the core-exposed lithium batteries on a shelf, and introduces the core-exposed lithium batteries on the shelf into a recovery device, first injects a sufficient amount of dry airflow into the extraction chamber through a dry airflow device, and then repeatedly pressurizes and depressurizes the pressure-changing chamber through an air pressure regulating device, repeatedly "squeezes" the dry airflow into the gaps of the positive and negative electrode winding materials of the core-exposed lithium batteries, so that the "dry" airflow fully contacts the positive and negative electrode winding materials of the core-exposed lithium batteries, and gradually "takes away" the electrolyte components attached to the positive and negative electrode winding materials. After multiple sufficient contacts, the volume of the extraction chamber is expanded to the maximum extent, so that the volume of the shelf and the core-exposed lithium batteries is minimized, and then the airflow containing a large amount of electrolyte components in the extraction chamber is discharged. After repeated operations, the electrolyte attached to the positive and negative electrode winding materials in the core-exposed lithium batteries is effectively "extracted". BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the recovery device in the present invention.

[0029] Figure 2 It is a schematic diagram of the separation of some components of the recovery device in the present invention.

[0030] Figure 3 It is a schematic diagram of the exposed core lithium battery in the present invention when it is ready to be loaded into the shelf.

[0031] Figure 4 It is a schematic diagram of the piston plate in the present invention when it moves repeatedly.

[0032] Figure 5 It is a schematic diagram of the present invention when the air is extracted from the cavity after "capacity expansion".

[0033] Among them: 1-device housing, 101-piston plate, 1011-piston ring, 102-extraction chamber, 103-pressure chamber, 104-installation socket, 105-airflow inlet pipe, 1051-first solenoid valve, 106-airflow outlet pipe, 1061-second solenoid valve, 107-air pressure connecting pipe, 108-photoelectric distance monitoring module, 109-air pressure monitoring module; 2-dry airflow pipe; 3-extraction discharge pipe; 4-air pressure regulating pipe; 5-servo rotation mechanism; 6-rotating arm; 7-sealing end cover, 701-sealing gasket; 8-shelf, 801-slot, 802-airflow outlet; 9-dew core lithium battery; 10-dry airflow equipment; 11-air pressure regulating equipment; 12-gas collection equipment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] Embodiment 1: The present invention designs a linear recovery device for lithium battery electrolyte that is controlled by optomechanical linkage, which effectively "extracts" the electrolyte attached to the positive and negative electrode winding materials in the exposed core lithium battery. The specific device structure is as follows:

[0036] See also Figure 1 In the recovery device of the present invention, a device housing 1 is provided, and two piston plates 101 are movably installed in the inner cavity of the device housing 1, and a withdrawal chamber 102 is formed between the two piston plates 101, and a pressure-changing chamber 103 is formed between the piston plate 101 and the device housing 1. There are two pressure-changing chambers 103, which are distributed on both sides of the withdrawal chamber 102. Figure 2 A piston ring 1011 is provided on the ring side of the piston plate 101, and the piston ring 1011 is in sliding and extrusion contact with the inner wall of the device housing 1.

[0037] Two airflow inlet pipes 105 are arranged on one side of the device shell 1, and the airflow inlet pipes 105 are symmetrically distributed on both sides of the shelf 8. The airflow inlet pipes 105 are arranged with a first solenoid valve 1051. The outside of the airflow inlet pipe 105 is connected to a dry airflow pipe 2. The airflow inlet pipe 105 is connected to the extraction chamber 102, and the dry airflow pipe 2 is connected to the dry airflow device 10.

[0038] Two air flow outlet pipes 106 are arranged on the other side of the device housing 1. The air flow outlet pipes 106 are provided with a second solenoid valve 1061. The air flow outlet pipes 106 are symmetrically distributed on both sides of the shelf 8. The air flow outlet pipes 106 are connected to the extraction chamber 102. The extraction exhaust pipe 3 is also connected to the outside of the air flow outlet pipe 106. The extraction exhaust pipe 3 is connected to the gas collection device 12.

[0039] The device housing 1 is also provided with an air pressure connecting pipe 107 , which is in communication with the pressure changing chamber 103 . The air pressure connecting pipe 107 is also connected to an air pressure regulating pipe 4 on the outside, and the air pressure regulating pipe 4 is connected to an air pressure regulating device 11 .

[0040] See also Figure 1 , Figure 2 Both side plates of the device housing 1 are provided with mounting sockets 104 , the mounting sockets 104 are horizontally connected with the extraction chamber 102 , and the shelf 8 is horizontally installed at the position of the mounting sockets 104 .

[0041] The device housing 1 is provided with a photoelectric distance monitoring module 108 , which monitors the moving position of the monitoring piston plate 101 . The device housing 1 is provided with an air pressure monitoring module 109 , which is used to monitor the air pressure of the pressure transformation chamber 103 .

[0042] The two servo rotating mechanisms 5 are located on the periphery of the device housing 1, and the two servo rotating mechanisms 5 are symmetrically distributed along the device housing 1. The output end of the servo rotating mechanism 5 is fixedly connected to the rotating arm 6, and the end of the rotating arm 6 is fixedly installed with a blocking end cover 7. The servo rotating mechanism 5 drives the blocking end cover 7 to rotate, and then blocks the installation socket 104 through the blocking end cover 7.

[0043] In addition, the sealing end cover 7 is provided with a sealing gasket 701 , which is arranged toward a side of the installation socket 104 , and the structural dimensions of the sealing gasket 701 match those of the installation socket 104 .

[0044] See also Figure 2 , Figure 3 The shelf 8 is provided with a plurality of slots 801 evenly distributed, and each slot 801 is provided with airflow openings 802 on both sides, the opening width of the airflow openings 802 is smaller, and the width of the slot 801 is larger. After being pre-cut, the exposed core lithium battery 9 is loaded into the slot 801, and the cutting positions at both ends of the exposed core lithium battery 9 are aligned with the airflow openings 802.

[0045] Embodiment 2: The present invention designs a linear recovery method of lithium battery electrolyte through optical-mechanical-electrical linkage control, and the specific method content is as follows:

[0046] First, when cutting the lithium battery, cut the lithium battery into a state where the internally wound positive and negative electrode core materials can be exposed at the front and back. The electrolyte is attached to the positive and negative electrode core materials, and most of the electrolyte attached to the positive and negative electrode core materials needs to be separated. The pre-cut exposed core lithium battery 9 is inserted into the slot 801 of the shelf 8 by a robotic arm device. When inserting, the exposed core part of the exposed core lithium battery 9 is facing the air flow port 802.

[0047] In the second step, the shelf 8 fully loaded with exposed lithium batteries 9 is inserted into the installation socket 104 of the device shell 1, and the servo rotation mechanism 5 drives the blocking end cover 7, which gradually approaches the device shell 1, and the blocking end cover 7 "corrects" the placement of the shelf 8 on both sides of the device shell 1. Finally, the blocking end cover 7 blocks the installation sockets 104 on both sides of the device shell 1.

[0048] Step 3: The dry air flow device 10 starts to inject dry air flow into the extraction chamber 102 through the dry air flow pipe 2 until the distance between the piston plate 101 monitored by the two photoelectric distance monitoring modules 108 is less than L min When the dry air flow pipe 2 is closed, the dry air flow device 10 stops the air flow output, wherein L min A reference value preset for the system.

[0049] Step 4: Combination Figure 4, start to drive the piston plate 101 to reciprocate: the two air pressure regulating devices 11 inject airflow through the air pressure regulating pipe 4 to increase the air pressure in the pressure changing chamber 103, and the piston plate 101 continues to approach the shelf 8. When the distance between the piston plate 101 detected by the two photoelectric distance monitoring modules 108 is greater than L max When the two air pressure regulating devices 11 start to reduce the pressure, reducing the air pressure in the pressure changing chamber 103, the piston plate 101 continues to move away from the shelf 8, wherein L max is a reference value preset by the system, L max >L min When the distance between the piston plates 101 detected by the two photoelectric distance monitoring modules 108 is less than L min When the two air pressure regulating devices 11 pressurize again, the air pressure in the pressure changing chamber 103 is increased, and the piston plate 101 continues to approach the shelf 8.

[0050] Repeat the reciprocating motion of the piston plate 101 in the fourth step above, and pressurize the transformer chamber 103 for no less than M times, M≥3. At this time, the electrolyte attached to the positive and negative electrode winding core materials of the exposed core lithium battery 9 is continuously impacted by the dry airflow, and the electrolyte content in the airflow increases.

[0051] Step 5: Combination Figure 5 After the last decompression of the transformer chamber 103 is completed, the extraction discharge pipe 3 is opened, and the gas collection device 12 continues to extract the gas in the extraction chamber 102. At this time, the electrolyte content in the airflow is relatively large, and the volume of the extraction chamber 102 is also at its maximum. There is less gas remaining in the positive and negative electrode winding cores of the dew-core lithium battery 9. A large amount of gas containing electrolyte components can be extracted, and then the electrolyte components in the gas can be easily separated later. Until the distance between the piston plates 101 monitored by the two photoelectric distance monitoring modules 108 is greater than L max When the gas collecting device 12 stops pumping gas, the exhaust pipe 3 is closed.

[0052] Finally, repeat the operation process from step three to step five, and repeat it no less than 3 times.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A linear recovery device for lithium battery electrolyte controlled by optical-mechanical-electrical linkage, characterized in that: The recovery device comprises: a device housing (1), two piston plates (101) located in the inner cavity of the device housing (1), an extraction chamber (102) located between the two piston plates (101), and a pressure changing chamber (103) located between the piston plate (101) and the device housing (1); Wherein, both side plates of the device housing (1) are provided with installation sockets (104) connected to the extraction chamber (102); a shelf (8) is inserted at the position of the installation socket (104); a plurality of evenly distributed slots (801) are provided on the shelf (8); and airflow openings (802) are provided on both sides of each slot (801); the pre-cut exposed core lithium battery (9) is placed at the position of the slot (801); and the cutting positions at both ends of the exposed core lithium battery (9) are directly opposite to the airflow openings (802); A side plate of the device housing (1) is provided with two dry air flow pipes (2) communicating with the extraction chamber (102), and the dry air flow pipes (2) are connected to the dry air flow device (10); The other side plate of the device housing (1) is provided with two extraction and discharge pipes (3) communicating with the extraction chamber (102), and the extraction and discharge pipes (3) are connected to the gas collecting device (12); The device housing (1) is also provided with an air pressure regulating pipe (4) communicating with the pressure changing chamber (103), and the air pressure regulating pipe (4) is connected to the air pressure regulating device (11); The device housing (1) is provided with a photoelectric distance monitoring module (108) for monitoring the moving position of the piston plate (101), and the device housing (1) is provided with a gas pressure monitoring module (109) for monitoring the gas pressure of the pressure-changing chamber (103); The device housing (1) is provided with two servo rotating mechanisms (5) symmetrically distributed along the device housing (1) on the periphery thereof; the output end of the servo rotating mechanism (5) is fixedly connected to a rotating arm (6); and a blocking end cover (7) for blocking the installation socket (104) is fixedly installed at the end of the rotating arm (6).

2. According to claim 1, a linear recovery device for lithium battery electrolyte controlled by optical-mechanical-electrical linkage, characterized in that: Two airflow introduction pipes (105) are provided on one side of the device housing (1), the airflow introduction pipes (105) are connected to the drying airflow pipe (2), and the airflow introduction pipes (105) are provided with a first solenoid valve (1051); Two air flow outlet pipes (106) are provided on one side of the device housing (1); the air flow outlet pipes (106) are connected to the extraction and discharge pipe (3); and the air flow outlet pipes (106) are provided with a second solenoid valve (1061).

3. The optical-mechanical-electrical linkage controlled linear recovery device for lithium battery electrolyte according to claim 2, characterized in that: The airflow introduction pipes (105) are symmetrically distributed on both sides of the shelf (8), and the airflow outlet pipes (106) are symmetrically distributed on both sides of the shelf (8).

4. The optical-mechanical-electrical linkage controlled linear recovery device for lithium battery electrolyte according to claim 1, characterized in that: The device housing (1) is provided with an air pressure connecting pipe (107) communicating with the pressure changing chamber (103), and the air pressure regulating pipe (4) is connected to the air pressure connecting pipe (107).

5. The optical-mechanical-electrical linkage controlled linear recovery device for lithium battery electrolyte according to claim 1, characterized in that: A piston ring (1011) is provided on the ring side of the piston plate (101), and the piston ring (1011) is in sliding and extrusion contact with the inner wall of the device housing (1).

6. The optical-mechanical-electrical linkage controlled linear recovery device for lithium battery electrolyte according to claim 1, characterized in that: The opening width of the airflow opening (802) is smaller than the width of the slot (801).

7. The optical-mechanical-electrical linkage controlled linear recovery device for lithium battery electrolyte according to claim 1, characterized in that: A sealing gasket (701) matching with the installation socket (104) is arranged on a side of the blocking end cover (7) facing the installation socket (104).

8. A linear recovery method for lithium battery electrolyte controlled by optical-mechanical-electrical linkage, characterized in that: A linear recovery device for lithium battery electrolyte controlled by optical-mechanical-electrical linkage according to any one of claims 1 to 7, comprising the following contents: S1. Insert the pre-cut exposed core lithium battery (9) into the slot (801) of the shelf (8) by a manipulator device. When inserting, the exposed core part of the exposed core lithium battery (9) is facing the air flow opening (802); S2. The shelf (8) fully loaded with exposed lithium batteries (9) is inserted into the installation socket (104) of the device housing (1), and the servo rotation mechanism (5) on both sides of the device housing (1) drives the blocking end cover (7), and the blocking end cover (7) on both sides of the device housing (1) corrects the placement position of the shelf (8), and the blocking end cover (7) blocks the installation socket (104) on both sides of the device housing (1); S3. The dry air flow device (10) injects dry air flow into the extraction chamber (102) through the dry air flow pipe (2) until the distance between the piston plate (101) monitored by the two photoelectric distance monitoring modules (108) is less than Lmin, the dry air flow pipe (2) is closed, and the dry air flow device (10) stops outputting air flow; S4. Two air pressure regulating devices (11) inject air flow through the air pressure regulating tube (4), increase the air pressure of the pressure chamber (103), and the piston plate (101) continues to approach the shelf (8); S5. When the distances of the piston plate (101) monitored by the two photoelectric distance monitoring modules (108) are both greater than Lmax, the two air pressure regulating devices (11) start to reduce the pressure, thereby reducing the air pressure of the pressure changing chamber (103), and the piston plate (101) continues to move away from the shelf (8); S6. When the distance between the piston plate (101) and the two photoelectric distance monitoring modules (108) is less than Lmin, the two air pressure regulating devices (11) pressurize again to increase the air pressure of the pressure chamber (103), and the piston plate (101) continues to approach the shelf (8); S7. Repeat steps S4 to S6, and pressurize the transformer chamber (103) for not less than M times, M≥3; S8. After the last decompression of the transformer chamber (103) is completed, the extraction and discharge pipe (3) is opened, and the gas collection device (12) continues to extract the gas in the extraction chamber (102) until the distance between the piston plate (101) monitored by the two photoelectric distance monitoring modules (108) is greater than Lmax, and the gas collection device (12) stops extracting gas, and the extraction and discharge pipe (3) is closed; S9. Repeat steps S3 to S8 K times, where K ≥ 3.

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