A lithium battery positive and negative electrode separation device and method

Abstract

This invention discloses a lithium battery positive and negative electrode separation device and method. The device includes a frame, an unfolding and leveling device, an electrode conveying device, and an electrode separation device. The unfolding and leveling device is positioned above the frame, the electrode conveying device is positioned above the frame and connected to the unfolding and leveling device, and the electrode separation device is positioned above the frame and connected to the electrode conveying device. The device of this invention can achieve rapid separation of lithium battery electrodes, has high working efficiency, reduces labor intensity, and minimizes harmful contact.

Description

Technical Field

[0001] This invention relates to the field of lithium battery recycling equipment technology, specifically to a lithium battery positive and negative electrode separation device and method. Background Technology

[0002] The application of batteries has become increasingly widespread, gradually expanding from small household appliances and electronic devices to large electric vehicles. In particular, the rise of new energy vehicles in recent years has driven the development of battery technology. In these applications, batteries used in electric vehicles require large output energy and power, resulting in large quantities being used. With the large-scale use of electric vehicles, a large amount of waste batteries will inevitably be generated.

[0003] Currently, in the physical recycling process of lithium batteries, in order to improve the recovery rate and purity and maximize the recycling of various resources, it is necessary to separate the positive and negative electrode plates and the separator of the lithium battery, and then recycle them separately. At present, the separation of the positive and negative electrode plates and the separator is done manually, which is inefficient, labor-intensive, and the waste gas generated during the separation process can also harm the environment and the health of employees.

[0004] In recent years, semi-automatic and fully automatic electrode separation equipment has emerged. Although it has improved work efficiency and avoided harm to operators to some extent, these devices have a low degree of automation and are prone to separation failure. At present, there is no mature electrode separation equipment in China that can be mass-produced industrially. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a lithium battery positive and negative electrode separation device and method. The device of this invention can achieve rapid separation of lithium battery electrodes, has high working efficiency, reduces labor intensity, and minimizes harmful contact.

[0006] To achieve the above-mentioned technical effects, the present invention provides the following technical solution:

[0007] A lithium battery positive and negative electrode separation device includes a frame, an unfolding and leveling device, an electrode conveying device, and an electrode separation device. The unfolding and leveling device is placed above the frame, the electrode conveying device is placed above the frame and connected to the unfolding and leveling device, and the electrode separation device is placed above the frame and connected to the electrode conveying device.

[0008] A further technical solution includes adjusting feet, which are located below the frame.

[0009] A further technical solution is that the unfolding and leveling device includes a flattening device body, a loading platform, an upper synchronous pulley group, a lower synchronous pulley group, pulley group gears, a synchronous belt, a pressure spring, and a pressure adjusting screw. The loading platform is located at the front end and connected to the flattening device body. The upper and lower synchronous pulley groups are located in the middle of the flattening device body. Several pulleys are arranged on the pulley group, and the pulleys are closely arranged. There are several groups of upper and lower synchronous pulley groups. One end of the first group is provided with a pulley group gear. Synchronization and power transmission between the pulleys are achieved through the meshing of the pulley group gears. The pulleys are connected by a synchronous belt. The synchronous belts between the first and second pulley groups are cross-connected to ensure gapless conveying. The pressure spring is located above both ends of the upper synchronous pulley group, and a pressure adjusting screw is provided above the pressure spring.

[0010] A further technical solution is that the unfolding and leveling device also includes a servo motor, a drive pulley, a power synchronous belt, a servo motor mount, tension rollers, an air knife assembly, and an air knife adjustment seat. The servo motor mount is placed on the flattening device body. The servo motor is connected to the servo motor mount. The drive pulley is placed on the servo motor shaft and connected to the first set of upper synchronous pulleys via the power synchronous belt. Tension rollers are installed between the two sets of upper synchronous pulleys and between the two sets of lower synchronous pulleys, and are connected to the flattening device body. An adjustment device is installed at the connection between the tension rollers and the flattening device body. The air knife assembly is placed on the flattening device body and connected to the flattening device body via the air knife adjustment seat.

[0011] The working principle of the unfolding and leveling device is as follows: The servo motor is activated, and the head of the four-layer sheet material of the lithium battery core is inserted between the upper and lower synchronous pulley sets. The friction between the synchronous belts generates tension, causing the four layers of material to move forward, thus unfolding, leveling, and straightening the core. Adjusting the pressure spring by adjusting the pressure adjusting screw can improve the leveling and straightening process. When the unfolded four layers of material pass under the air knife assembly, the electrolyte on their surface is quickly dried.

[0012] A further technical solution is that the electrode conveying device includes an electrode conveying device body, an upper synchronous pulley group, a lower synchronous pulley group, pulley group gears, a synchronous belt, a pressure spring, a pressure adjusting screw, a servo motor, a drive pulley, a power synchronous belt, a servo motor mount, and a tensioning roller. The upper and lower synchronous pulley groups are located in the middle of the electrode conveying device body. Several pulleys are arranged on the pulley group, and the pulleys are closely arranged. There are several groups of upper and lower synchronous pulley groups. One end of the first group is provided with a pulley group gear. The pulleys are connected by a synchronous belt. The synchronous belts between the first group and the second group are cross-connected. The pressure spring is located above both ends of the upper synchronous pulley group, and a pressure adjusting screw is provided above the pressure spring.

[0013] A further technical solution is that the electrode separation device includes an electrode separation device body, a servo motor, a servo motor mount, a drive pulley, a power synchronous belt, a conveyor pulley shaft, a conveyor synchronous belt, a tension pulley, a pressure adjusting screw, a pressure spring, a tension idler, and a second conveyor pulley shaft. The servo motor mount is placed above the electrode separation device body, and the servo motor is mounted on the servo motor mount. The drive pulley is placed at the end of the servo motor shaft. The conveyor pulley shaft is located at the front end and is connected to the drive pulley via the power synchronous belt. The second conveyor pulley shaft is located at the rear end. Several synchronous pulleys are provided on the conveyor pulley shaft and the second conveyor pulley shaft. The conveyor synchronous belt is used to connect the conveyor pulley shaft and the second conveyor pulley shaft. The tension pulley is located on one side of the power synchronous belt. Pressure springs are provided at both ends of the conveyor pulley shaft and the second conveyor pulley shaft. Pressure adjusting screws are also provided on the pressure springs. The tension idler is located between the conveyor pulley shaft and the second conveyor pulley shaft for tensioning the conveyor synchronous belt.

[0014] A further technical solution is that the electrode separation device also includes a transition synchronous belt, a transition tensioning pulley, friction idlers, friction adjusting screws, a transmission synchronous belt, a transmission tensioning pulley, and a separation idler. The transition synchronous belt connects the friction idlers and the conveyor belt pulley shaft together. The transition tensioning pulley is located on one side of the transition synchronous belt. The friction idlers are equipped with four sets of friction wheels that contact the separation idlers and transmit power to them. The friction adjusting screws are located at both ends of the friction idlers. Synchronous pulleys are located at both ends of the friction idlers and are connected in pairs via the transmission synchronous belt. The transmission tensioning pulley is located on the underside of the transmission synchronous belt between the friction idlers and is used to tension the transmission synchronous belt.

[0015] The working principle of the electrode separation device is as follows: A servo motor drives the conveyor belt to rotate via a drive pulley, a power synchronous belt, and a conveyor pulley shaft, transporting the four layers of sheet material to the separation roller. Simultaneously, the servo motor drives the conveyor belt to rotate via the drive pulley, the power synchronous belt, and the conveyor pulley shaft, transporting the four layers of sheet material to the separation roller. At the same time, the conveyor belt transmits power to the separation roller via a second conveyor pulley shaft, the synchronous belt, and the friction roller, causing it to rotate and separating the bottom electrode separator from the four layers of sheet material. The remaining multiple layers of electrode material continue to move forward until the positive electrode, the intermediate separator, and the negative electrode are completely separated.

[0016] This invention also provides a method for separating the positive and negative electrodes of a lithium battery, specifically including the following steps:

[0017] (1) Core feeding: Unwrap a portion of the wound lithium battery cell and place the unwrapped portion into the conveying and leveling device;

[0018] (2) Core unfolding and leveling: The unfolding and leveling device includes at least one set of belt mechanisms that move up and down relative to each other. The upper and lower belt mechanisms rotate relative to each other and stretch and level the wound lithium battery cell through friction, and then transport it to the electrode separation device.

[0019] (3) Electrode Separation: The electrode separation device includes four sets of separation rollers and a conveyor belt. Each separation roller has a positive pressure area and a negative pressure area. When the four-layer core, after being unfolded and leveled, is conveyed to the first separation roller, the bottom layer of the separator film is adsorbed onto the surface of the separation roller and rotates with it to the positive pressure area, then detaches from the surface of the separation roller, thus achieving separation of the separator film. When the remaining three layers of core are conveyed to the second separation roller, the bottom layer of the positive electrode film is adsorbed onto the surface of the separation roller and rotates with it to the positive pressure area, then detaches from the surface of the separation roller, achieving separation of the separator film. The core is rotated to the positive pressure area and then detaches from the surface of the separating roller, thus separating the positive electrode sheet. When the remaining two layers of core are conveyed to the third separating roller, the bottom layer of the intermediate separator is adsorbed onto the surface of the separating roller and rotates with the separating roller to the positive pressure area, then detaches from the surface of the separating roller, thus separating the intermediate separator. When the remaining negative electrode sheet is conveyed to the fourth separating roller, the negative electrode sheet is adsorbed onto the surface of the separating roller and rotates with the separating roller to the positive pressure area, then detaches from the surface of the separating roller, thus separating the intermediate negative electrode sheet.

[0020] Compared with the prior art, the present invention has the following advantages: the device of the present invention can realize the rapid separation of lithium battery electrodes, with high working efficiency, and reduces labor intensity and harmful contact. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the operation of the separation device of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of a lithium battery positive and negative electrode separation device.

[0023] Figure 3 A schematic diagram of the unfolded leveling device;

[0024] Figure 4 This is a schematic diagram of the electrode conveying device;

[0025] Figure 5 This is a schematic diagram of the electrode separation device.

[0026] Among them, 1-lithium battery cell, 2-conveying and leveling device, 3-electrode separation device, 4-second separation roller, 5-third separation roller, 6-fourth separation roller, 7-first separation roller, 8-separator, 9-positive electrode sheet, 10-intermediate separator, 11-negative electrode sheet, 12-four-layer sheet material;

[0027] 101 - The separation device includes a frame; 102 - The unfolding and leveling device; 103 - The electrode conveying device; 104 - The electrode separation device; 105 - The adjusting feet.

[0028] 10201-Flattening device body, 10202-Loading platform, 10203-Upper synchronous belt pulley set, 10204-Lower synchronous belt pulley set, 10205-Pulley set gear, 10206-Synchronous belt, 10207-Pressure spring, 10208-Pressure adjusting screw, 10209-Servo motor, 10210-Drive pulley, 10211-Power synchronous belt, 10212-Servo motor base, 10213-Tensioning roller, 10214-Air knife assembly, 10215-Air knife adjusting seat;

[0029] 10301-Electrode conveying device, 10303-Upper synchronous belt pulley set, 10304-Lower synchronous belt pulley set, 10305-Pulley set gear, 10306-Synchronous belt, 10307-Pressure spring, 10308-Pressure adjusting screw, 10309-Servo motor, 10310-Drive pulley, 10311-Power synchronous belt, 10312-Servo motor mount, 10313-Tensioning roller;

[0030] 10401 - Electrode separation device body, 10402 - Servo motor, 10403 - Servo motor base, 10404 - Drive pulley, 10405 - Power synchronous belt, 10406 ​​- Conveyor pulley shaft, 10407 - Conveyor synchronous belt, 10408 - Tensioning pulley, 10409 - Pressure adjusting screw, 10410 - Pressure spring, 10411 - Tensioning idler, 10412 - Second conveyor pulley shaft, 10413 - Transition synchronous belt, 10414 - Transition tensioning pulley, 10415 - Friction idler, 10416 - Friction adjusting screw, 10417 - Transmission synchronous belt, 10418 - Transmission tensioning pulley, 10419 - Separation idler. Detailed Implementation

[0031] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, the wound lithium battery cell 1 comprises four layers of sheets 12: a separator 8, a positive electrode sheet 9, an intermediate separator 10, and a negative electrode sheet 11. The positive and negative electrode sheets of this lithium battery are separated according to the following steps:

[0034] Step 1, Core feeding: Unwrap a portion of the wound lithium battery cell 1 and place the unwrapped portion into the conveying and leveling device 2;

[0035] Step 2, Core Unwinding and Leveling: The unwinding and leveling device includes at least one set of belt mechanisms that move up and down relative to each other. The upper and lower belt mechanisms rotate relative to each other and stretch and level the wound lithium battery cell through friction, and then transport it to the electrode separation device 3.

[0036] Step 3, Electrode Separation: The electrode separation device includes four sets of separation rollers and a conveyor belt. Each separation roller has a positive pressure zone and a negative pressure zone. When the four layers of wound core, after being unfolded and leveled, are conveyed to the first separation roller, the bottom layer of the separator film 8 adheres to the surface of the first separation roller 7 and rotates with the roller to the positive pressure zone, then detaches from the roller surface, achieving separation of the separator film 8. When the remaining three layers of wound core are conveyed to the second separation roller 4, the bottom layer of the positive electrode film 9 is adhered to the surface of the separation roller and rotates with the roller to the positive pressure zone, then detaches from the roller surface, achieving separation of the positive electrode film 9. When the remaining two layers of wound core are conveyed to the third separation roller 5, the bottom layer of the intermediate separator film 10 is adhered to the surface of the separation roller and rotates with the roller to the positive pressure zone, then detaches from the roller surface, achieving separation of the intermediate separator film 10. When the remaining negative electrode sheet 11 is conveyed to the fourth separating roller 6, the negative electrode sheet 11 is adsorbed on the surface of the separating roller and rotates to the positive pressure area with the separating roller, and then detaches from the surface of the separating roller, thus realizing the separation of the intermediate negative electrode sheet 11.

[0037] Example 2

[0038] like Figure 2 As shown, a lithium battery positive and negative electrode separation device includes a frame 101, an unfolding and leveling device 102, an electrode conveying device 103, an electrode separation device 104, and adjusting feet 105. The unfolding and leveling device 102 is mounted on the frame 101. The electrode conveying device 103 is mounted on the frame 101 and connected to the unfolding and leveling device 102. The electrode separation device 104 is mounted on the frame 101 and connected to the cutting device 103. The adjusting feet 105 are located below the frame 101, supporting weight and adjusting height to ensure the frame is level. The frame 101 can also be constructed using other methods such as welding steel profiles.

[0039] Unfold the leveling device as follows Figure 3As shown, the unfolding and leveling device 102 includes a flattening device body 10201, a loading platform 10202, an upper synchronous pulley group 10203, a lower synchronous pulley group 10204, a pulley gear 10205, a synchronous belt 10206, a pressure spring 10207, and a pressure adjusting screw 10208. The loading platform 10202 is located at the front end and connected to the flattening device body 10201, used for guiding and supporting the head of the four-layer sheet material unfolding the lithium battery core. The upper synchronous pulley group 10203 and the lower synchronous pulley group 10204 are located in the middle of the flattening device body 10201. Several pulleys are arranged on the pulley group, and the pulleys are closely arranged. There are several groups of upper synchronous pulley groups 10203 and lower synchronous pulley groups 10204. One end of the first group is provided with a pulley gear 10205, and the synchronization and power transmission between the pulleys are realized through the meshing of the pulley gear 10205. The pulleys are connected by a synchronous belt, and the synchronous belts of the preceding and following pulley sets are cross-connected to ensure gapless conveying. Pressure springs 10207 are positioned above both ends of the upper synchronous pulley set 10203 to adjust the pressure between the upper and lower synchronous pulley sets 10204. Each pressure spring 10207 is equipped with a pressure adjusting screw 10208.

[0040] The unfolding and leveling device 102 includes a servo motor 10209, a drive pulley 10210, a power synchronous belt 10211, a servo motor mount 10212, a tension roller 10213, an air knife assembly 10214, and an air knife adjustment seat 10215. The servo motor mount 10212 is placed on the flattening device body 10201. The servo motor 10209 is connected to the servo motor mount 10212. The drive pulley 10210 is placed on the shaft of the servo motor 10209 and is connected to the first set of upper synchronous pulleys 10203 via the power synchronous belt 10211. The tension roller 10213 is placed between the two sets of upper synchronous pulleys 10203 and is connected to the flattening device body 10201. An adjustment device is provided at the connection between the tension roller 10213 and the flattening device body 10201, which can adjust the tension roller 10213 up and down to achieve tensioning of the synchronous belt 10206. A tensioning roller 10213 is also provided between the two sets of upper and lower synchronous pulleys 10204. The air knife assembly 10214 is placed on the flattening device body 10201 and connected to the flattening device body 10201 via the air knife adjusting seat 10215. The air knife adjusting seat 10215 can also adjust the angle of the air knife assembly 10214.

[0041] The working principle of the unfolding and leveling device 102 is as follows: The servo motor is activated, and the head of the four-layer sheet 12 of the lithium battery core is inserted between the upper synchronous pulley set 10203 and the lower synchronous pulley set 10204. The four layers of sheet material move forward due to the tension generated by the friction between the synchronous belts 10206, thus achieving the unfolding, leveling, and straightening of the four layers of sheet material. The leveling and straightening can be improved by adjusting the pressure spring 10207 by adjusting the pressure adjusting screw 10208. When the unfolded four layers of sheet material pass under the air knife assembly 10214, the electrolyte on its surface can be quickly dried.

[0042] Electrode conveying device 103 Figure 4 As shown, the electrode conveying device 103 includes an electrode conveying device 10301, an upper synchronous pulley group 10303, a lower synchronous pulley group 10304, a pulley gear 10305, a synchronous belt 10306, a pressure spring 10307, ​​a pressure adjusting screw 10308, a servo motor 10309, a drive pulley 10310, a power synchronous belt 10311, a servo motor mount 10312, and a tensioning roller 10313. The upper synchronous pulley group 10302 and the lower synchronous pulley group 10303 are positioned in the middle of the electrode conveying device 10301. Several pulleys are arranged on each pulley group, closely spaced. The upper synchronous pulley group 10303 and the lower synchronous pulley group 10304 have several groups. One end of the first group is equipped with a pulley gear 10305, which meshes with the pulley gear 10305 to achieve synchronization and power transmission between the pulleys. The pulleys are connected by a synchronous belt, and the synchronous belts of the preceding and following pulley sets are cross-connected to ensure gapless conveying. Pressure springs 10307 are positioned above both ends of the upper synchronous pulley set 10303 to adjust the pressure between the upper and lower synchronous pulley sets 10304. Each pressure spring 10307 is equipped with a pressure adjusting screw 10308.

[0043] The working principle of the electrode conveying device 103 is similar to that of the unfolding and leveling device 102.

[0044] Electrode separation device such as Figure 5As shown, the electrode separation device 104 includes an electrode separation device body 10401, a servo motor 10402, a servo motor mount 10403, a drive pulley 10404, a power synchronous belt 10405, a conveyor pulley shaft 10406, a conveyor synchronous belt 10407, a tension pulley 10408, a pressure adjusting screw 10409, a pressure spring 10410, a tension idler roller 10411, and a second conveyor pulley shaft 10412. The servo motor mount 10403 is positioned above the electrode separation device body 10401, and the servo motor 10402 is mounted on the servo motor mount 10403. The drive pulley 10404 is positioned at the end of the servo motor 10402 shaft. The conveyor pulley shaft 10406 ​​is located at the front end and is connected to the drive pulley 10404 via the power synchronous belt 10405. The second conveyor pulley shaft 10412 is located at the rear end. Several synchronous pulleys are mounted on the conveyor pulley shaft 10406 ​​and the second conveyor pulley shaft 10412. A synchronous conveyor belt 10407 connects the conveyor pulley shaft 10406 ​​and the second conveyor pulley shaft 10412. A tensioning pulley 10408 is positioned on one side of the power synchronous belt 10405 and is used to tension the synchronous belt 10405. Both ends of the conveyor pulley shaft 10406 ​​and the second conveyor pulley shaft 10412 are equipped with pressure springs 10410, and each pressure spring 10410 is also equipped with a pressure adjusting screw 10409. A tensioning idler roller 10411 is positioned between the conveyor pulley shaft 10406 ​​and the second conveyor pulley shaft 10412 and is used to tension the synchronous conveyor belt 10407.

[0045] The electrode separation device also includes a transition timing belt 10413, a transition tensioning pulley 10414, a friction idler roller 10415, a friction adjusting screw 10416, a drive timing belt 10417, a drive tensioning pulley 10418, and a separation idler roller 10419. The transition timing belt 10413 connects the friction idler roller 10415 and the conveyor belt pulley shaft 10407. The transition tensioning pulley 10414 is located on one side of the transition timing belt 10413 and is used to tension the transition timing belt 10413. The friction idler roller 10415 has four sets of friction wheels that contact the separation idler roller 10419, transmitting power to the separation idler roller 10419. The friction adjusting screw 10416 is located at both ends of the friction idler roller 10415 and is used to adjust the pressure between the friction idler roller 10415 and the separation idler roller 10419. The friction idler rollers 10415 are equipped with synchronous pulleys at both ends, which are connected in pairs by the transmission synchronous belts 10417 to achieve power transmission. The transmission tensioning pulleys 10418 are located on the underside of the transmission synchronous belts 10417 between the friction idler rollers 10415 and are used to tension the transmission synchronous belts 10417.

[0046] The working principle of the electrode separation device 104 is as follows: The servo motor 10402 drives the conveyor synchronous belt 10407 to rotate via the drive pulley 10404, the power synchronous belt 10405, and the conveyor pulley shaft 10406, conveying the four layers of sheet material 12 to the separation roller 10418. Simultaneously, the servo motor 10402 drives the conveyor synchronous belt 10407 to rotate via the drive pulley 10404, the power synchronous belt 10405, and the conveyor pulley shaft 10406, conveying the four layers of sheet material 12 to the separation roller 10419. At the same time, the conveyor synchronous belt 10407 transmits power to the separation roller 10419 via the second conveyor pulley shaft 10412, the synchronous belt 10413, and the friction roller 10415, causing it to rotate and thus separating the bottom electrode separator 8 from the four layers of sheet material 12. The remaining multiple layers of electrode material continue forward until the positive electrode 9, the intermediate separator 10, and the negative electrode 11 are completely separated.

[0047] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A lithium battery positive and negative electrode sheet separating device, characterized by, The pole piece separating device comprises a pole piece separating device body, a servo motor, a servo motor seat, a driving pulley, a power synchronous belt, a conveying pulley shaft, a conveying synchronous belt, a tension pulley, a pressing adjusting screw, a pressing spring, a tension roller and a second conveying pulley shaft. The pole piece separating device further comprises a transition synchronous belt, a transition tension pulley, a friction roller, a friction force adjusting screw, a transmission synchronous belt, a transmission tension pulley and a separating roller. The pole piece separating device comprises four sets of separating rollers and conveying belts. The adjustment foot cup is arranged below the rack.

2. The lithium battery positive and negative electrode sheet separating apparatus according to claim 1, characterized by, The unwinding and leveling device comprises a flattening device body, a feeding table, an upper synchronous pulley set, a lower synchronous pulley set, a pulley gear, a synchronous belt, a pressure spring and a pressure adjusting screw.

3. The lithium battery positive and negative electrode sheet separating apparatus according to claim 1, characterized by, The unwinding and leveling device comprises a flattening device body, a feeding table, an upper synchronous pulley set, a lower synchronous pulley set, a pulley gear, a synchronous belt, a pressure spring and a pressure adjusting screw.

4. The lithium battery positive and negative electrode sheet separating apparatus according to claim 1, characterized by, The unwinding and flattening device further comprises a servo motor, a driving pulley, a power synchronous belt, a servo motor seat, a tensioning roller, a air knife assembly, and an air knife adjusting seat, wherein the servo motor seat is arranged on the flattening device body; the servo motor is connected with the servo motor seat; the driving pulley is arranged on the servo motor shaft and connected with the first group of upper synchronous pulley groups through the power synchronous belt; the tensioning roller is arranged between the two groups of upper synchronous pulley groups and the two groups of lower synchronous pulley groups and connected with the flattening device body; the adjusting device is arranged at the connection between the tensioning roller and the flattening device body; the air knife assembly is arranged on the flattening device body and connected with the flattening device body through the air knife adjusting seat.

5. The lithium battery positive and negative electrode sheet separating apparatus according to claim 1, characterized in that, The pole piece conveying device comprises a pole piece conveying device body, upper synchronous pulley groups, lower synchronous pulley groups, pulley group gears, synchronous belts, pressure springs, pressure adjusting screws, a servo motor, a driving pulley, a power synchronous belt, a servo motor seat, and a tensioning roller, wherein the upper synchronous pulley groups and the lower synchronous pulley groups are arranged in the middle of the pole piece conveying device body; a plurality of pulleys are arranged on the pulley groups; the pulleys are closely arranged; the upper synchronous pulley groups and the lower synchronous pulley groups are divided into a plurality of groups; the first group is provided with a pulley group gear at one end; the pulleys are connected through the synchronous belts; the synchronous belts between the previous pulley group and the next pulley group are cross-connected; the pressure springs are arranged above the two ends of the upper synchronous pulley groups; and the pressure adjusting screws are arranged above the pressure springs.

6. A method of separating positive and negative electrode sheets of a lithium battery, characterized by, It is realized by using the separation device according to any one of claims 1-5, and specifically comprises the following steps: (1) winding core feeding: a part of the winding lithium battery core is unwound, and the unwound part is placed into the conveying and flattening device; (2) winding core unwinding and flattening: the unwinding and flattening device comprises at least one group of upper and lower synchronous belt mechanisms, the upper and lower synchronous belt mechanisms are relatively rotated, the winding lithium battery core is stretched and flattened through friction, and is conveyed to the pole piece separation device; (3) pole piece separation: the pole piece separation device comprises four groups of separation rollers and conveying belts, wherein a positive pressure area and a negative pressure area are formed in the separation rollers, when the four-layer winding core after unwinding and flattening is conveyed to the first separation roller, the lowermost layer of the isolation film is adsorbed on the surface of the separation roller and rotates to the positive pressure area with the separation roller, and then is separated from the surface of the separation roller, so that the isolation film is separated; when the remaining three layers of winding core are conveyed to the second separation roller, the lowermost layer of the positive pole piece is adsorbed on the surface of the separation roller and rotates to the positive pressure area with the separation roller, and then is separated from the surface of the separation roller, so that the positive pole piece is separated; when the remaining two layers of winding core are conveyed to the third separation roller, the lowermost layer of the intermediate isolation film is adsorbed on the surface of the separation roller and rotates to the positive pressure area with the separation roller, and then is separated from the surface of the separation roller, so that the intermediate isolation film is separated; when the remaining negative pole piece is conveyed to the fourth separation roller, the negative pole piece is adsorbed on the surface of the separation roller and rotates to the positive pressure area with the separation roller, and then is separated from the surface of the separation roller, so that the negative pole piece is separated.

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