Lithium battery pole piece winding device and working method

Abstract

The invention relates to a lithium battery pole piece winding device and a working method. The lithium battery pole piece winding device comprises a winding composite mechanism, and a negative pole piece conveying mechanism and a first diaphragm conveying mechanism are arranged on one side of the winding mechanism to feed a negative pole piece and a first diaphragm into the winding mechanism; a positive plate conveying mechanism and a second diaphragm conveying mechanism are arranged on the other side of the winding mechanism so as to feed a positive plate and a second diaphragm into the winding composite mechanism, a negative plate cutting mechanism is arranged at the tail end of the negative plate conveying mechanism in the conveying direction of the negative plate, and a negative plate preheating mechanism is arranged in front of the negative plate cutting mechanism; a positive plate cutting mechanism is arranged at the tail end of the positive plate conveying mechanism in the conveying direction of the positive plate, a positive plate preheating mechanism is arranged in front of the positive plate cutting mechanism, and the winding device is high in compounding quality and working efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery cell manufacturing technology, specifically to a lithium battery electrode winding device and its working method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] With the gradual depletion of global oil resources, the demand for new energy sources is becoming increasingly urgent. Lithium batteries, with their high energy density, voltage, and long cycle time, have been commercialized and widely used. Currently, lithium battery cells can be manufactured using a winding process. There is a continuous winding equipment for stacking lithium batteries, including a negative electrode release system and a positive electrode release system. Below the negative electrode release system is a negative electrode separator release preheating system, and above the positive electrode release system is a positive electrode separator preheating system. In use, the positive electrode is combined with the preheated positive electrode separator to form the positive electrode, and the negative electrode is combined with the preheated negative electrode separator to form the negative electrode. The positive and negative electrodes are then combined after preheating. However, this method, especially the preheating of the separator before combination, causes stretching during the separator's conveying process, affecting the separator's conveying accuracy and quality, and consequently impacting the thermal bonding effect. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a lithium battery electrode winding device and working method, which overcomes the defects of the current lithium battery electrode winding device.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, embodiments of the present invention provide a lithium battery electrode winding device, including a winding and compositing mechanism. A negative electrode conveying mechanism and a first separator conveying mechanism are provided on one side of the winding mechanism to feed the negative electrode and the first separator into the winding mechanism. A positive electrode conveying mechanism and a second separator conveying mechanism are provided on the other side of the winding mechanism to feed the positive electrode and the second separator into the winding and compositing mechanism. Along the conveying direction of the negative electrode, a negative electrode cutting mechanism is provided at the end of the negative electrode conveying mechanism, and a negative electrode preheating mechanism is provided in front of the negative electrode cutting mechanism. Along the conveying direction of the positive electrode, a positive electrode cutting mechanism is provided at the end of the positive electrode conveying mechanism, and a positive electrode preheating mechanism is provided in front of the positive electrode cutting mechanism.

[0006] Optionally, the winding composite mechanism includes a winding needle mechanism, with a back roller mechanism on one side of the winding needle mechanism, and a space is formed between the winding needle mechanism and the back roller mechanism for the positive electrode sheet, the first diaphragm, the negative electrode sheet and the second diaphragm to pass through.

[0007] Optionally, the back roller mechanism includes a back roller that can rotate about its own axis. The back roller is a hollow roller with a heating element installed in its internal cavity.

[0008] Optionally, along the conveying direction of the negative electrode sheet, the negative electrode sheet conveying mechanism includes a negative electrode sheet unwinding roller, a negative electrode sheet buffer assembly, a negative electrode sheet correction assembly, and a negative electrode sheet feeding assembly arranged sequentially between the negative electrode sheet preheating mechanism and the negative electrode sheet cutting mechanism.

[0009] Optionally, a negative electrode surface defect detection mechanism is provided between the negative electrode correction component and the negative electrode buffer component.

[0010] Optionally, along the conveying direction of the positive electrode sheet, the positive electrode sheet conveying mechanism includes a positive electrode sheet unwinding roller, a positive electrode sheet buffer assembly, a positive electrode sheet correction assembly, and a positive electrode sheet feeding assembly arranged sequentially between the positive electrode sheet preheating mechanism and the positive electrode sheet cutting mechanism.

[0011] Optionally, a positive electrode thin film defect detection mechanism is provided between the positive electrode correction assembly and the positive electrode buffer assembly.

[0012] Optionally, along the conveying direction of the first diaphragm, the first diaphragm conveying mechanism includes a first diaphragm unwinding roller, a first diaphragm buffer assembly, a first diaphragm correction assembly, and a first diaphragm guide roller assembly arranged sequentially.

[0013] Optionally, along the conveying direction of the second diaphragm, the second diaphragm conveying mechanism includes a second diaphragm unwinding roller, a second diaphragm buffer assembly, a second diaphragm correction assembly, and a second diaphragm guide roller assembly arranged sequentially.

[0014] Secondly, embodiments of the present invention provide a method for operating the lithium battery electrode winding device described in the first aspect. The negative electrode sheet conveyed by the negative electrode sheet conveying mechanism passes through the negative electrode sheet preheating mechanism and the negative electrode sheet cutting mechanism in sequence. The preheated and cut negative electrode sheet then enters the winding and compounding mechanism. The positive electrode sheet conveyed by the positive electrode sheet conveying mechanism passes through the positive electrode sheet preheating mechanism and the positive electrode sheet cutting mechanism in sequence. The preheated and cut negative electrode sheet then enters the winding and compounding mechanism. The first separator conveying mechanism sends the first separator into the winding and compounding mechanism. The second separator conveying mechanism sends the second separator into the winding and compounding mechanism. The winding and compounding mechanism winds and combines the simultaneously fed positive electrode sheet, the first separator, the negative electrode sheet, and the second separator.

[0015] The beneficial effects of this invention are as follows: 1. The lithium battery winding device and working method of the present invention includes a negative electrode preheating mechanism and a positive electrode preheating mechanism. After the positive and negative electrodes are preheated, the preheated positive electrode, the first separator, the preheated negative electrode, and the second separator are wound and combined by a winding and compounding mechanism. Compared with the method of preheating the separator and then compounding it with the electrode, the stretching of the separator during the tape-carrying process is avoided, ensuring the tape-carrying accuracy and quality of the separator. Furthermore, the preheating of the positive and negative electrodes and their combination with the separator ensures that the positive and negative electrodes are uniformly bonded to the separator, and the porosity of the separator can meet the requirements, thus improving the compounding quality.

[0016] 2. The lithium battery winding device and working method of the present invention uses a hollow roller with a heating element inside, so that the positive electrode sheet, negative electrode sheet, first separator and second separator are thermally bonded when they are bonded together, thus ensuring the bonding strength of the positive electrode sheet, negative electrode sheet, first separator and second separator.

[0017] 3. The lithium battery winding device and working method of the present invention, wherein the positive electrode sheet, the negative electrode sheet, the first separator and the second separator are combined once in the winding and composite mechanism, which improves the working efficiency compared with the traditional winding device. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Among them, 1. negative electrode sheet conveying mechanism, 2. first diaphragm conveying mechanism, 3. second diaphragm conveying mechanism, 4. positive electrode sheet conveying mechanism, and 5. winding and composite mechanism; 11. Negative electrode unwinding roller; 12. Negative electrode buffer assembly; 13. Negative electrode surface defect detection mechanism; 14. Negative electrode correction assembly; 15. Negative electrode preheating mechanism; 16. Negative electrode feeding assembly. 21. First diaphragm unwinding roller; 22. First diaphragm buffer assembly; 23. First diaphragm correction assembly; 31. Second diaphragm unwinding roller; 32. Second diaphragm buffer assembly; 33. Second diaphragm correction assembly; 41. Positive electrode unwinding roller; 42. Positive electrode buffer assembly; 43. Positive electrode surface defect detection mechanism; 44. Positive electrode correction assembly; 45. Positive electrode preheating mechanism; 46. Positive electrode feeding assembly. Detailed Implementation Example 1 This embodiment provides a lithium battery electrode winding device, such as... Figure 1As shown, the winding and compositing mechanism includes a winding and compositing mechanism 5. On one side of the winding and compositing mechanism 5 are a negative electrode sheet conveying mechanism 1 and a first diaphragm conveying mechanism 2. The negative electrode sheet conveying mechanism 1 is used to feed the negative electrode sheet into the winding and compositing mechanism 5, and the first diaphragm conveying mechanism 2 is used to feed the first diaphragm into the winding and compositing mechanism 5. The negative electrode sheet conveying mechanism 1 is located above the first diaphragm conveying mechanism 2. On the other side of the winding and compositing mechanism 5 are a positive electrode sheet conveying mechanism 4 and a second diaphragm conveying mechanism 3. The positive electrode sheet conveying mechanism 4 is used to feed the positive electrode sheet into the winding and compositing mechanism 5, and the second diaphragm conveying mechanism 3 is used to feed the second diaphragm into the winding and compositing mechanism 5. The second diaphragm conveying mechanism 3 is located above the positive electrode sheet conveying mechanism 4. This arrangement of the negative electrode sheet conveying mechanism 1, the first diaphragm conveying mechanism 2, the positive electrode sheet conveying mechanism 4, and the second diaphragm conveying mechanism 3 allows the positive electrode sheet, the negative electrode sheet, the first diaphragm, and the second diaphragm to enter the winding and compositing mechanism 5 in a distribution pattern from the inside out.

[0020] Along the conveying direction of the negative electrode sheet, the negative electrode sheet conveying mechanism includes a negative electrode sheet unwinding roller 11, a negative electrode sheet buffer assembly 12, a negative electrode sheet correction assembly 14, and a negative electrode sheet feeding assembly 16 arranged in sequence.

[0021] A negative electrode sheet is wound on the negative electrode sheet unwinding roller 11. The negative electrode sheet unwinding roller 11 is rotatably connected to the negative electrode sheet unwinding roller bracket. The negative electrode sheet unwinding roller rotates around its own axis, which can release the negative electrode sheet.

[0022] The negative electrode buffer assembly 12 includes multiple buffer rollers, which are rotatably connected to a buffer roller support. The multiple buffer rollers are staggered horizontally. After the negative electrode passes around the multiple buffer rollers in sequence, the negative electrode forms a zigzag distribution within the negative electrode buffer assembly 12, which increases the travel distance of the negative electrode and plays a buffering role.

[0023] The negative electrode correction component 14 can be made using existing technology, such as the correction mechanism disclosed in patent CN220065771U.

[0024] A negative electrode surface defect detection mechanism 13 is provided between the negative electrode buffer assembly 12 and the negative electrode correction assembly 14. The negative electrode surface defect detection mechanism 13 includes three conveying rollers. The conveying roller in the middle changes the conveying direction of the negative electrode from horizontal to vertical. A first image acquisition element is provided above the area between the first two conveying rollers to acquire images of the upper surface of the negative electrode. A second image acquisition element is provided on one side of the area between the last two conveying rollers to acquire images of the lower surface of the negative electrode. The first and second image acquisition elements can be existing cameras or cameras. The first and second image acquisition elements are connected to the control system and can transmit the acquired image information to the control system.

[0025] A negative electrode preheating mechanism 15 is provided behind the negative electrode correction assembly 14. Preferably, three conveying rollers are provided between the negative electrode correction assembly 14 and the negative electrode preheating mechanism 15 to guide the conveying direction of the negative electrode, so that the negative electrode can smoothly enter the negative electrode preheating mechanism 15.

[0026] In this embodiment, the negative electrode preheating mechanism 15 adopts a box with an inlet and an outlet. The negative electrode enters the box from the inlet and extends out of the box from the outlet. Heating elements are provided at the top and bottom of the box. The heating elements are heating rods or resistance wires, etc. Existing heating elements can be used and will not be described in detail here. The box is also equipped with thermocouples to detect the temperature inside the box. The heating elements at the top and bottom of the box can ensure uniform heating of the upper and lower surfaces of the negative electrode.

[0027] A negative electrode feeding assembly 16 is provided behind the negative electrode preheating mechanism 15. The negative electrode feeding assembly 16 adopts a roller mechanism, including two feeding rollers arranged opposite each other. The feeding rollers are rotatably connected to the feeding roller bracket. There is a space between the two feeding rollers for the negative electrode to pass through. Both feeding rollers are connected to a drive motor fixed on the feeding roller bracket. The drive motor can drive the two feeding rollers to move in opposite directions, thereby providing power for the negative electrode to move forward.

[0028] A negative electrode sheet cutting mechanism 17 is provided behind the negative electrode sheet feeding assembly 16 for cutting the negative electrode sheet. The negative electrode sheet cutting mechanism includes two blades, and a space is formed between the two blades for the negative electrode sheet to pass through. The two blades are connected to a linear drive member. The linear drive member and the blades are arranged along a direction perpendicular to the conveying direction of the negative electrode sheet. The linear drive member can drive the two blades to move towards each other and away from each other, thereby cutting the negative electrode sheet.

[0029] The linear drive component can be a pneumatic cylinder or a hydraulic cylinder, with a hydraulic cylinder being preferred. Those skilled in the art can set it according to actual needs, and it will not be described in detail here.

[0030] Along the conveying direction of the first diaphragm, the first diaphragm conveying mechanism includes a first diaphragm unwinding roller 21, a first diaphragm buffer assembly 22, a first diaphragm correction assembly 23, and a first diaphragm guide roller assembly arranged in sequence.

[0031] The first diaphragm unwinding roller 21 is rotatably connected to the first diaphragm unwinding roller bracket. The first diaphragm is wound on the first diaphragm unwinding roller 21. The first diaphragm unwinding roller rotates around its own axis, which can release the first diaphragm.

[0032] The first diaphragm buffer assembly 22 includes multiple buffer rollers arranged in a staggered manner along the vertical direction. The first diaphragm passes around the multiple buffer rollers in sequence, so that the first diaphragm is distributed in a zigzag pattern in the first diaphragm buffer assembly 22, which extends the travel of the first diaphragm and buffers the movement of the first diaphragm.

[0033] The structure of the first diaphragm correction assembly 23 is the same as that of the negative electrode correction assembly 14, and will not be described again here.

[0034] The first diaphragm guide roller assembly includes two guide rollers, which are rotatably connected to the guide roller bracket and are used to guide the movement of the first diaphragm so that the first diaphragm can enter the winding and compounding mechanism 5.

[0035] Along the conveying direction of the positive electrode sheet, the positive electrode sheet conveying mechanism includes a positive electrode sheet unwinding roller 41, a positive electrode sheet buffer assembly 42, a positive electrode sheet correction assembly 44, and a positive electrode sheet feeding assembly 46 arranged in sequence.

[0036] The positive electrode unwinding roller 41 is rotatably connected to the positive electrode unwinding roller bracket. The positive electrode is wound on the positive electrode unwinding roller 41. The positive electrode unwinding roller rotates around its own axis, which can release the positive electrode.

[0037] The positive electrode buffer assembly 42 includes multiple buffer rollers that are staggered in the horizontal direction. The positive electrode sheet passes around the multiple buffer rollers in sequence, so that the positive electrode sheet is distributed in a zigzag pattern within the positive electrode buffer assembly, which increases the travel of the positive electrode sheet and plays a buffering role.

[0038] The positive electrode correction component 44 has the same structure as the negative electrode correction component 14, and will not be described again here.

[0039] A positive electrode surface defect detection mechanism 43 is provided between the positive electrode buffer component 42 and the positive electrode correction component 44.

[0040] The positive electrode surface defect detection mechanism 43 includes three conveying rollers. The conveying roller in the middle changes the conveying direction of the positive electrode from horizontal to vertical. A third image acquisition element is provided above the area between the first two conveying rollers to acquire images of the upper surface of the positive electrode. A fourth image acquisition element is provided on one side of the area between the last two conveying rollers to acquire images of the lower surface of the positive electrode. The third and fourth image acquisition elements can be existing cameras or cameras. The third and fourth image acquisition elements are connected to the control system and can transmit the acquired image information to the control system.

[0041] A positive electrode preheating mechanism 45 is provided behind the positive electrode correction assembly 44.

[0042] Furthermore, two guide rollers are provided between the positive electrode correction assembly 44 and the positive electrode preheating mechanism 45. The two guide rollers are used to feed the positive electrode sheet sent out by the positive electrode correction assembly 44 into the positive electrode preheating mechanism 45.

[0043] In this embodiment, the positive electrode preheating mechanism 45 adopts a box with an inlet and an outlet. The positive electrode enters the box from the inlet and extends out of the box from the outlet. Heating elements are provided at the top and bottom of the box. The heating elements are heating rods or resistance wires, etc. Existing heating elements can be used and will not be described in detail here. The box is also equipped with thermocouples to detect the temperature inside the box. The heating elements at the top and bottom of the box can ensure uniform heating of the upper and lower surfaces of the positive electrode.

[0044] A positive electrode feeding assembly 46 is provided behind the positive electrode preheating mechanism 45. The positive electrode feeding assembly 46 adopts a roller mechanism, including two oppositely arranged conveyor rollers. There is a space between the two conveyor rollers for the positive electrode to pass through. Both conveyor rollers are rotatably connected to the conveyor roller bracket. The two conveyor rollers are connected to a drive motor fixed between the conveyor rollers. The drive motor drives the two conveyor rollers to rotate in opposite directions, thereby providing power for the forward movement of the positive electrode.

[0045] A positive electrode cutting mechanism 47 is provided behind the positive electrode feeding assembly 46 for cutting the positive electrode. The positive electrode cutting mechanism 47 includes two blades, and a space is formed between the two blades for the positive electrode to pass through. The two blades are connected to a linear drive member. The linear drive member and the blades are arranged along a direction perpendicular to the conveying direction of the positive electrode. The linear drive member can drive the two blades to move towards each other and away from each other, thereby cutting the positive electrode.

[0046] The linear drive component can be a pneumatic cylinder or a hydraulic cylinder, with a hydraulic cylinder being preferred. Those skilled in the art can set it according to actual needs, and it will not be described in detail here.

[0047] Along the conveying direction of the second diaphragm, the second diaphragm conveying mechanism 3 includes a second diaphragm unwinding roller 31, a second diaphragm buffer assembly 32, a second diaphragm correction assembly 33, and a second diaphragm guide roller assembly arranged in sequence.

[0048] The second diaphragm unwinding roller 31 is rotatably connected to the second diaphragm unwinding roller bracket. The second diaphragm is wound on the second diaphragm unwinding roller 31. The second diaphragm unwinding roller 31 rotates around its own axis, which can release the second diaphragm.

[0049] The second diaphragm buffer assembly 32 includes multiple buffer rollers arranged in a staggered manner along the vertical direction. The second diaphragm passes around the multiple buffer rollers in sequence, so that the second diaphragm is distributed in a zigzag pattern in the second diaphragm buffer assembly 32, which extends the travel of the second diaphragm and buffers its movement.

[0050] The structure of the second diaphragm correction assembly 33 is the same as that of the negative electrode correction assembly 14 and the positive electrode correction assembly 44, and will not be described again here.

[0051] The second diaphragm guide roller assembly includes two guide rollers, which are rotatably connected to the guide roller bracket and are used to guide the movement of the second diaphragm so that the second diaphragm can enter the winding and compounding mechanism 5.

[0052] The winding composite mechanism 5 includes a needle winding mechanism 52 and a back roller mechanism 51. The needle winding mechanism 52 includes a needle winding, which is rotatably connected to the winding mechanism bracket. The needle winding is connected to a needle winding drive motor fixed in the winding mechanism. The needle winding drive motor can drive the needle winding to rotate around its own axis. The structure of the needle winding can be achieved using existing technology and will not be described in detail here.

[0053] The back roller mechanism 52 includes a back roller, which is connected to a back roller drive motor. The back roller drive motor can drive the back roller to rotate in the opposite direction to the rotation direction of the winding needle. The back roller drive motor is fixed on a motor base, which is slidably connected to the winding mechanism bracket. The motor base is connected to a telescopic drive component, which can drive the motor base to move, thereby driving the back roller to move toward or away from the winding needle to achieve pressure adjustment.

[0054] A space is formed between the back roller and the winding needle for the first diaphragm, negative electrode, positive electrode, and second diaphragm to pass through. The rotation of the winding needle allows the first diaphragm, second diaphragm, positive electrode, and negative electrode to be wound together as a whole onto the winding needle.

[0055] In this embodiment, the telescopic drive component is a device capable of outputting linear motion, such as a hydraulic cylinder, a pneumatic cylinder, or a linear motor. Those skilled in the art can choose according to actual needs, and will not be described in detail here. Preferably, the telescopic drive component is a hydraulic cylinder.

[0056] Furthermore, both the first diaphragm buffer component and the second diaphragm buffer component are provided with an antistatic mechanism. The antistatic mechanism can use existing equipment, and its specific structure will not be described in detail here. The antistatic mechanism can blow ion wind onto the diaphragm to neutralize the static electricity on the diaphragm.

[0057] Furthermore, a marking mechanism can be set up behind the positive electrode surface defect detection mechanism and the negative electrode surface defect detection mechanism to mark the surfaces of the non-compliant positive and negative electrodes. Existing equipment can be used for the marking mechanism, which will not be described in detail here.

[0058] Example 2 This embodiment provides a method for operating the lithium battery electrode winding device described in Embodiment 1: The negative electrode sheet extending from the negative electrode unwinding roller 11 passes sequentially through the negative electrode sheet buffer assembly 12, the negative electrode surface defect detection mechanism 13, the negative electrode sheet correction assembly 14, the negative electrode sheet preheating mechanism 15, the negative electrode feeding assembly 16, and the negative electrode cutting mechanism 17. The negative electrode feeding assembly 16 clamps the negative electrode sheet and drives it forward. The negative electrode unwinding roller 11 rotates to release the negative electrode sheet. The negative electrode buffer assembly 12 buffers the negative electrode sheet. The negative electrode surface defect detection mechanism 13 collects images of the upper and lower surfaces of the negative electrode sheet and detects surface defects. The negative electrode sheet correction assembly 14 corrects the forward direction of the negative electrode sheet. The negative electrode sheet preheating mechanism 15 preheats the negative electrode sheet. After preheating, the negative electrode sheet is cut and then enters the winding and composite mechanism 5.

[0059] The positive electrode sheet extending from the positive electrode unwinding roller 41 passes sequentially through the positive electrode sheet buffer assembly 42, the positive electrode surface defect detection mechanism 43, the positive electrode sheet correction assembly 44, the positive electrode sheet preheating mechanism 45, the positive electrode feeding assembly 46, and the positive electrode cutting mechanism 47. The positive electrode feeding assembly 46 clamps the positive electrode sheet and drives it forward. The positive electrode unwinding roller 41 rotates to release the positive electrode sheet. The positive electrode sheet buffer assembly 42 buffers the positive electrode sheet. The positive electrode surface defect detection mechanism 43 collects images of the upper and lower surfaces of the positive electrode sheet and detects surface defects. The positive electrode sheet correction assembly 44 corrects the forward direction of the positive electrode sheet. The positive electrode sheet preheating mechanism 45 preheats the positive electrode sheet. After preheating, the positive electrode sheet is cut and then enters the winding and composite mechanism 5.

[0060] The first diaphragm extending from the first diaphragm unwinding roller 21 passes sequentially through the first diaphragm buffer assembly 22, the first diaphragm correction assembly 23, and two guide rollers before entering the winding composite mechanism 5.

[0061] The second diaphragm extending from the second diaphragm unwinding roller 31 passes sequentially through the second diaphragm buffer assembly 32, the second diaphragm correction assembly 33, and two guide rollers before entering the winding composite mechanism 5.

[0062] The winding needle and back roller in the winding composite mechanism 5 rotate in opposite directions to provide power for the forward movement of the first diaphragm, the second diaphragm, the positive electrode sheet, and the negative electrode sheet.

[0063] Along the radial direction of the winding needle, from the inside out, the positive electrode sheet, the second separator, the negative electrode sheet, and the first separator are wound around the outer circumference of the winding needle in the order of positive electrode sheet, second separator, negative electrode sheet, and first separator. The back roller and the winding needle compress the positive electrode sheet, second separator, negative electrode sheet, and first separator to form a dense structure. The heating element inside the back roller operates, causing the positive electrode sheet, second separator, negative electrode sheet, and first separator to thermally bond together, ensuring the bonding strength.

[0064] In this embodiment, the winding device winds and combines the preheated positive electrode sheet, the first separator, the preheated negative electrode sheet, and the second separator. The separator is not preheated. Compared with the method of combining the separator with the electrode sheet after preheating, this avoids the stretching of the separator during the tape feeding process, ensuring the tape feeding accuracy and separator quality. Furthermore, the positive and negative electrodes are preheated and combined with the separator, which allows the positive and negative electrodes to be uniformly bonded to the separator, and the separator porosity can be guaranteed to meet the requirements, improving the composite quality. Moreover, the positive electrode sheet, negative electrode sheet, first separator, and second separator are combined in one composite process using the winding mechanism, which improves work efficiency.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lithium battery electrode winding device, characterized in that, The device includes a winding and compounding mechanism. On one side of the winding mechanism, there is a negative electrode sheet conveying mechanism and a first diaphragm conveying mechanism to feed the negative electrode sheet and the first diaphragm into the winding mechanism. On the other side of the winding mechanism, there is a positive electrode sheet conveying mechanism and a second diaphragm conveying mechanism to feed the positive electrode sheet and the second diaphragm into the winding and compounding mechanism. Along the conveying direction of the negative electrode sheet, there is a negative electrode sheet cutting mechanism at the end of the negative electrode sheet conveying mechanism and a negative electrode sheet preheating mechanism in front of the negative electrode sheet cutting mechanism. Along the conveying direction of the positive electrode sheet, there is a positive electrode sheet cutting mechanism at the end of the positive electrode sheet conveying mechanism and a positive electrode sheet preheating mechanism in front of the positive electrode sheet cutting mechanism.

2. The lithium battery electrode winding device as described in claim 1, characterized in that, The winding composite mechanism includes a needle winding mechanism, and a back roller mechanism is provided on one side of the needle winding mechanism. A space is formed between the needle winding mechanism and the back roller mechanism for the positive electrode sheet, the first diaphragm, the negative electrode sheet and the second diaphragm to pass through.

3. A lithium battery electrode winding device as described in claim 2, characterized in that, The back roller mechanism includes a back roller that can rotate around its own axis. The back roller is a hollow roller with a heating element installed in its internal cavity.

4. A lithium battery electrode winding device as described in claim 1, characterized in that, Along the conveying direction of the negative electrode sheet, the negative electrode sheet conveying mechanism includes a negative electrode sheet unwinding roller, a negative electrode sheet buffer assembly, a negative electrode sheet correction assembly, and a negative electrode sheet feeding assembly arranged in sequence between the negative electrode sheet preheating mechanism and the negative electrode sheet cutting mechanism.

5. A lithium battery electrode winding device as described in claim 4, characterized in that, A surface defect detection mechanism for the negative electrode is provided between the negative electrode correction component and the negative electrode buffer component.

6. A lithium battery electrode winding device as described in claim 1, characterized in that, Along the conveying direction of the positive electrode sheet, the positive electrode sheet conveying mechanism includes a positive electrode sheet unwinding roller, a positive electrode sheet buffer assembly, a positive electrode sheet correction assembly, and a positive electrode sheet feeding assembly arranged in sequence between the positive electrode sheet preheating mechanism and the positive electrode sheet cutting mechanism.

7. A lithium battery electrode winding device as described in claim 6, characterized in that, A positive electrode thin film defect detection mechanism is provided between the positive electrode correction component and the positive electrode buffer component.

8. A lithium battery electrode winding device as described in claim 1, characterized in that, Along the conveying direction of the first diaphragm, the first diaphragm conveying mechanism includes a first diaphragm unwinding roller, a first diaphragm buffer assembly, a first diaphragm correction assembly, and a first diaphragm guide roller assembly arranged in sequence.

9. A lithium battery electrode winding device as described in claim 1, characterized in that, Along the conveying direction of the second diaphragm, the second diaphragm conveying mechanism includes a second diaphragm unwinding roller, a second diaphragm buffer assembly, a second diaphragm correction assembly, and a second diaphragm guide roller assembly arranged in sequence.

10. A method of operating the lithium battery electrode winding device according to any one of claims 1-9, characterized in that, The negative electrode sheet conveyed by the negative electrode sheet conveying mechanism passes through the negative electrode sheet preheating mechanism and the negative electrode sheet cutting mechanism in sequence. After being preheated and cut, the negative electrode sheet enters the winding and compounding mechanism. The positive electrode sheet conveyed by the positive electrode sheet conveying mechanism passes through the positive electrode sheet preheating mechanism and the positive electrode sheet cutting mechanism in sequence. After being preheated and cut, the negative electrode sheet enters the winding and compounding mechanism. The first diaphragm conveying mechanism sends the first diaphragm into the winding and compounding mechanism, and the second diaphragm conveying mechanism sends the second diaphragm into the winding and compounding mechanism. The winding and compounding mechanism winds and combines the positive electrode sheet, the first diaphragm, the negative electrode sheet, and the second diaphragm that are fed in at the same time.

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