Hot cutting mechanism of lithium battery cutting and stacking machine

Abstract

A hot cutting mechanism of a lithium battery cutting and stacking machine is used for cutting off a composite material belt diaphragm. The feeding assembly is used for supporting and driving materials to move on the workbench in the feeding direction; the hot cutting assembly is arranged on a feeding path of the materials in the feeding direction and comprises a hot cutting driving part, a hot cutting rack and a hot cutter arranged on the hot cutting rack, the hot cutter is arranged perpendicular to the feeding direction, and the hot cutting driving part is connected with the hot cutter so as to drive the hot cutter to cut the materials; and the cutter cleaning assembly comprises a cutter cleaning part and a cutter cleaning driving part, the cutter cleaning part is provided with a cleaning groove used for wrapping a blade of the hot cutter, and the cutter cleaning driving part is connected with the cutter cleaning part and used for driving the cutter cleaning part to move in the length direction of the hot cutter. The cutter cleaning assembly is arranged to clean the cutter after material cutting, diaphragm molten slag bonding residues are reduced, the quality influence caused by the diaphragm molten slag is reduced, manual cleaning is not needed, and therefore the sheet production efficiency and the yield are improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a hot cutting mechanism for a lithium battery stacking machine. Background Technology

[0002] The automatic lithium battery cutting and stacking integrated machine is a thermal lamination and stacking integrated equipment developed for the cell manufacturing process of power and energy storage lithium-ion batteries, employing a thermal lamination technology route. The biggest advantage of thermal lamination technology is that it can achieve complete slicing and stacking of the positive electrode, negative electrode, and separator in a single operation, effectively improving the quality and production rate of the stacked cells. During the lamination process, the stacking platform does not reciprocate; the negative electrode sheet and the two separator layers are already heat-bonded into units before entering the stacking platform, and there is no separator tail roll after stacking, avoiding internal and tail roll wrinkles in the separator during the stacking process. The separator moves at a uniform speed throughout the entire stacking process, avoiding alternating separator tension, resulting in more accurate visual inspection of the thermally laminated sheets with near-zero error rates. Furthermore, the lamination process improves the adhesion between the positive and negative electrode sheets and the separator, resulting in better interface retention.

[0003] The lithium-ion battery separator is an inner component of a lithium-ion battery. In the structure of a lithium-ion battery, the separator's main function is to separate the positive and negative electrodes, preventing short circuits caused by contact between the electrodes. It is one of the key inner components. The performance of the separator determines the battery's interface structure, internal resistance, and other characteristics, directly affecting the battery's capacity, cycle life, and safety performance. A high-performance separator plays a crucial role in improving the overall performance of the battery. Lithium-ion battery separator hot-cutting technology is a key technology in the hot-composite process of lithium-ion battery production. It cuts the composite material strip into negative electrode composite units, completing the bag-making and cutting process in the lithium-ion battery manufacturing process.

[0004] Existing membrane cutting technologies include single-blade thermal cutting and laser cutting. Single-blade thermal cutting is currently the mainstream membrane cutting technology in the market. The technology is mature, with a maximum speed of 180 PPM, which is difficult to meet the needs of high-speed automatic stacking machines in the latest lithium battery manufacturing. At the same time, the membrane slag sticks to the cutting blade, frequently causing membrane burns. This requires frequent manual intervention to clean the cutting blade, which is prone to damage to the cutting blade due to misoperation. Laser cutting technology is currently expensive, has a complex mechanism, and is difficult to debug and maintain, making it difficult to promote in large quantities. Utility Model Content

[0005] This application provides a hot cutting mechanism for a lithium battery stacking machine, which can clean the cutting blade without increasing additional costs, reduce the residue of molten slag adhering to the separator, and thus improve the separator cutting efficiency.

[0006] According to this application, one embodiment provides a hot cutting mechanism for a lithium battery stacking machine, used to cut composite strip separators, including:

[0007] Workbench;

[0008] A feeding assembly is used to support and drive the material to move along the feeding direction on the worktable;

[0009] A hot-cutting assembly, disposed along the material feeding path in the feeding direction, includes a hot-cutting drive, a hot-cutting frame, and a hot-cutting blade disposed on the hot-cutting frame, wherein the hot-cutting blade is disposed perpendicular to the feeding direction. The hot-cutting drive is connected to the hot-cutting blade to drive the hot-cutting blade to cut the material; and

[0010] The blade cleaning assembly includes a blade cleaning section and a blade cleaning drive. The blade cleaning section has a cleaning groove for wrapping the cutting edge of the hot cutting blade. The blade cleaning drive is connected to the blade cleaning section and drives the blade cleaning section to move along the length direction of the hot cutting blade.

[0011] In another embodiment, the hot cutting machine frame is provided with a cleaning mounting bracket parallel to the hot cutting blade, and the cleaning mounting bracket is located below the hot cutting blade. The cleaning drive is connected to the cleaning mounting bracket to drive the cleaning part to move along the length direction of the hot cutting blade.

[0012] In another embodiment, the inner wall of the cleaning groove is provided as an elastic and high-temperature resistant cleaning layer, which is used to hold the blade of the hot cutting knife.

[0013] In another embodiment, the cleaning layer is adhesive.

[0014] In another embodiment, the hot cutting assembly further includes a tool mounting portion, a heating portion, and a connecting portion. The connecting portion is used to connect the tool mounting portion and the output end of the hot cutting drive. The tool mounting portion is used to mount the hot cutting blade. The heating portion is disposed on the tool mounting portion and heats the hot cutting blade.

[0015] In another embodiment, the tool mounting part is connected to a plurality of guide parts, one end of the guide part is fixed to the tool mounting part, and the other end of the guide part is slidably connected to the hot cutting frame along the cutting direction, and the length direction of the guide part is parallel to the cutting direction.

[0016] In another embodiment, the guide portion is provided with an elastic buffer portion, which connects the guide portion and the hot cutting frame.

[0017] In another embodiment, the feeding assembly includes a feeding frame and a traction part and a feeding drive member disposed on the feeding frame. The traction part is rotatably mounted on the feeding frame, and the feeding drive member is disposed on the feeding frame and used to drive the traction part to rotate. The traction part is perpendicular to the feeding direction and is used to traction the material.

[0018] In another embodiment, the hot-cutting assembly is provided in two sets, with a feeding assembly provided on both sides of each hot-cutting assembly.

[0019] In another embodiment, a cutter correction assembly is provided on the worktable, and the cutter correction assembly is connected to any of the hot cutting assemblies.

[0020] According to the above embodiment, the hot cutting mechanism of the lithium battery stacking machine realizes the hot cutting of the separator during the automatic hot composite stacking process of lithium batteries. The feeding component supports and drives the material to move along the feeding direction on the worktable until it passes through the hot cutting component and reaches the hot cutting position. The hot cutting drive drives the hot cutting blade to descend and cut the material. The hot cutting drive drives the hot cutting blade to move to the cleaning position so that the hot cutting blade and the cleaning groove are at the same height. Then, the cleaning drive drives the cleaning part to move along the length of the hot cutting blade. The cleaning groove wraps around the hot cutting blade and cleans the hot cutting blade during the movement of the cleaning part. The separator slag is cleaned before the next cutting, avoiding the problem of separator burn. There is no need for manual cleaning, reducing the quality impact of separator slag, improving sheet production efficiency and yield. Compared with laser cutting, it has low cost, simple structure, and is easy to promote in large quantities. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of the hot cutting mechanism of a lithium battery stacking machine;

[0022] Figure 2 This is a schematic diagram showing the distribution of two sets of heat-cutting components in one embodiment;

[0023] Figure 3 This is a schematic diagram of the cleaning blade assembly in another embodiment;

[0024] Figure 4 This is a schematic diagram of the structure of the heat-cutting component in another embodiment;

[0025] Figure 5 This is a front view of the heat-cutting assembly in another embodiment;

[0026] Figure 6 for Figure 4 Enlarged view of section A;

[0027] Figure 7 This is a schematic diagram of the feeding assembly in another embodiment;

[0028] Figure 8 This is a schematic diagram of the detection component in another embodiment;

[0029] Figure 9 This is a schematic diagram of the structure of the heat-cutting drive component in another embodiment;

[0030] Figure 10 for Figure 9 Exploded view along the axis of rotation;

[0031] Figure 11 This is a schematic diagram of the cutter correction drive component in another embodiment.

[0032] Reference numerals: 1. Workbench; 11. Guide rail; 12. Moving table; 2. Feeding assembly; 21. Feeding frame; 22. Main drive roller; 23. Pressure roller; 24. Pressure roller drive unit; 25. Feeding drive component; 3. Hot cutting assembly; 31. Hot cutting drive component; 311. Cutter power seat; 312. Power motor; 313. Transmission unit; 314. Eccentric part; 3141. Rotating shaft; 3142. Turntable; 3143. Offset bearing; 315. Holding part; 3151. Pressure plate; 3152. Lower pressure bearing; 3153. Adjustment groove; 316. Limiting part; 32. Hot cutting frame; 321. Support frame; 322. Base frame; 323. Vertical frame; 324. Top frame; 325. Quick release pressure block; 33. Hot cutting 34. Blade; 341. Guide frame; 35. Clear groove; 36. Tool mounting part; 37. Mounting post; 38. Tool clamp; 39. Heating part; 30. Heating rod; 31. Thermocouple; 32. Connecting part; 33. Guide part; 34. Guide post; 35. Linear bearing; 36. Elastic buffer part; 4. Cleaning assembly; 41. Cleaning part; 411. Moving frame; 412. Base; 413. Cleaning head; 414. Cleaning groove; 415. Cleaning layer; 42. Cleaning drive; 43. Cleaning mounting frame; 5. Detection assembly; 51. Detection frame; 52. Industrial camera; 6. Cutting blade correction assembly; 61. Correction mounting frame; 62. Correction motor; 63. Correction screw; 64. Correction connecting block. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0034] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0035] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0036] The automatic lithium battery cutting and stacking integrated machine is a thermal lamination and stacking integrated equipment developed for the cell manufacturing process of power and energy storage lithium-ion batteries, employing a thermal lamination technology route. The biggest advantage of thermal lamination technology is that it can achieve complete slicing and stacking of the positive electrode, negative electrode, and separator in a single operation, effectively improving the quality and production rate of the stacked cells. During the lamination process, the stacking platform does not reciprocate; the negative electrode sheet and the two separator layers are already heat-bonded into units before entering the stacking platform, and there is no separator tail roll after stacking, avoiding internal and tail roll wrinkles in the separator during the stacking process. The separator moves at a uniform speed throughout the entire stacking process, avoiding alternating separator tension, resulting in more accurate visual inspection of the thermally laminated sheets with near-zero error rates. Furthermore, the lamination process improves the adhesion between the positive and negative electrode sheets and the separator, resulting in better interface retention.

[0037] The lithium-ion battery separator is an inner component of a lithium-ion battery. In the structure of a lithium-ion battery, the separator's main function is to separate the positive and negative electrodes, preventing short circuits caused by contact between the electrodes. It is one of the key inner components. The performance of the separator determines the battery's interface structure, internal resistance, and other characteristics, directly affecting the battery's capacity, cycle life, and safety performance. A high-performance separator plays a crucial role in improving the overall performance of the battery. Lithium-ion battery separator hot-cutting technology is a key technology in the hot-composite process of lithium-ion battery production. It cuts the composite material strip into negative electrode composite units, completing the bag-making and cutting process in the lithium-ion battery manufacturing process.

[0038] Existing membrane cutting technologies include single-blade thermal cutting and laser cutting. Single-blade thermal cutting is currently the mainstream membrane cutting technology in the market. The technology is mature, with a maximum speed of 180 PPM, which is difficult to meet the needs of high-speed automatic stacking machines in the latest lithium battery manufacturing. At the same time, the membrane slag sticks to the cutting blade, frequently causing membrane burns. This requires frequent manual intervention to clean the cutting blade, which is prone to damage to the cutting blade due to misoperation. Laser cutting technology is currently expensive, has a complex mechanism, and is difficult to debug and maintain, making it difficult to promote in large quantities.

[0039] This application provides a hot cutting mechanism for a lithium battery stacking machine, which is used to cut the membrane of the composite strip during the automatic hot composite stacking process of lithium batteries. By setting a cleaning component 4 to clean the cutter after cutting, the residual molten slag of the membrane is reduced, ensuring the flatness of the cutter during the next cutting, reducing the quality impact of the molten slag of the membrane, eliminating the need for manual cleaning, thereby improving the sheet production efficiency and yield.

[0040] Please refer to Figure 1 , Figure 2 and Figure 3 One embodiment provides a hot cutting mechanism for a lithium battery slitting machine, used to cut composite strip separators, comprising: a worktable 1 for supporting the hot cutting mechanism and mounting various components; a feeding assembly 2 for supporting and driving the material to move along the feeding direction on the worktable 1; a hot cutting assembly 3, arranged along the feeding direction on the material feeding path, including a hot cutting drive 31, a hot cutting frame 32, and a hot cutting blade 33 arranged on the hot cutting frame 32, wherein the hot cutting blade 33 is arranged perpendicular to the feeding direction, the hot cutting drive 31 is connected to the hot cutting blade 33 to drive the hot cutting blade 33 to descend and cut the material; and a blade cleaning assembly 4, including a blade cleaning part 41 and a blade cleaning drive 42, the blade cleaning part 41 having a cleaning groove 414 for wrapping the blade edge of the hot cutting blade 33, the blade cleaning drive 42 being connected to the blade cleaning part 41 and used to drive the blade cleaning part 41 to move along the length direction of the hot cutting blade 33.

[0041] According to the above embodiment, the hot cutting mechanism of the lithium battery stacking machine realizes the hot cutting of the separator during the automatic hot composite stacking process of lithium batteries. The feeding component 2 supports and drives the material to move along the feeding direction on the worktable 1 until it passes through the hot cutting component 3 and reaches the hot cutting position. The hot cutting drive 31 drives the hot cutting blade 33 to descend and cut the material. The hot cutting drive 31 drives the hot cutting blade 33 to move to the cleaning position, so that the hot cutting blade 33 and the cleaning groove 414 are at the same height. Then, the cleaning drive 42 drives the cleaning part 41 to move along the length of the blade of the hot cutting blade 33. The cleaning groove 414 wraps around the hot cutting blade 33 and cleans the hot cutting blade 33 during the movement of the cleaning part 41. The separator slag is cleaned before the next cutting, avoiding the problem of separator burn. There is no need for manual cleaning, reducing the quality impact of separator slag, improving sheet production efficiency and yield. Compared with laser cutting, it has low cost, simple structure, and is easy to promote in large quantities.

[0042] In the embodiments of this application, please refer to Figure 1 , Figure 2 and Figure 4The hot-cutting assembly 3 has two sets, and the cleaning assembly 4 has two corresponding sets. Each hot-cutting assembly 3 has a feeding assembly 2 on both sides, meaning there are three sets of feeding assemblies 2. These feeding assemblies 2 can be used to compensate for the feeding length of the feeding assembly 2. The lithium battery stacking machine's hot-cutting mechanism also includes a detection assembly 5 and a cutting tool correction assembly 6. The worktable 1 is arranged sequentially along the feeding direction of the feeding assembly 2 as the detection assembly 5, the first set of feeding assemblies 2, the first set of hot-cutting assemblies 3, the second set of feeding assemblies 2, the second set of hot-cutting assemblies 3, and the third set of feeding assemblies 2. Two sets of cleaning assemblies 4 are respectively installed on two sets of hot-cutting assemblies 3. The detection assembly 5 is located at the front end of the feeding path and is used to detect the distance between adjacent electrode sheets and obtain the deviation value between the actual position and the set position. The cutting tool correction assembly 6 is connected to any set of hot-cutting assemblies 3 to adjust the distance between the two sets of hot-cutting assemblies 3.

[0043] This application adopts a dual hot-cutting mechanism design, which can be matched with the highest existing lithium battery stacking equipment to achieve a bag cutting speed of 240PPM, which is currently the highest speed in the lithium battery industry.

[0044] For details, please refer to Figure 1 The composite material strip diaphragm is continuously fed in the feeding direction by the traction of three sets of feeding components 2. When it reaches the detection position, the feeding stops. The detection component 5 detects the position of the distance between adjacent electrodes and obtains the corresponding deviation values ​​between the actual position and the set position of the two adjacent electrodes. The feeding component 2 continues to feed. The feeding component 2 compensates for the feeding length according to the deviation value of the front electrode. The cutting correction component 6 compensates for and corrects the cutting position according to the deviation value of the rear electrode, thereby realizing the correction of the two adjacent electrodes.

[0045] For further details, please refer to... Figure 4 and Figure 5 The hot cutting frame 32 includes a support frame 321, a base frame 322, a vertical frame 323, and a top frame 324 from bottom to top. There are two vertical frames 323. The base frame 322, vertical frame 323, and top frame 324 are arranged in a "U" shape. The hot cutting blade 33 is installed on the top frame 324 and can move vertically under the action of the hot cutting drive 31. The material passes through the hot cutting frame 32 horizontally, and the hot cutting blade 33 descends to cut the material.

[0046] Please refer to Figure 3 , Figure 5 and Figure 6In this embodiment, the cleaning drive 42 adopts a linear rodless cylinder or other module that can achieve linear motion. The linear rodless cylinder is parallel to the hot cutting blade 33 and is located directly below the hot cutting blade 33. The stroke of the linear rodless cylinder is longer than the blade length of the hot cutting blade 33, so that the vertical projection of the hot cutting blade 33 falls completely within the stroke range of the linear rodless cylinder. A cleaning mounting bracket 43 is provided on either side of the linear rodless cylinder, and is supported and connected to the base frame 322 through the cleaning mounting bracket 43. The slide of the linear rodless cylinder is used to install the cleaning part 41. When the cleaning assembly 4 is not working, the slide and the cleaning part 41 are located at the support position of the cleaning mounting bracket 43, away from the working position of the hot cutting blade 33.

[0047] Please refer to Figure 3 and Figure 6 The cleaning unit 41 includes a movable frame 411 mounted on a slide table, a base 412 mounted on the movable frame 411, and a cleaning head 413 disposed on the base 412. The cleaning head 413 is U-shaped to form the cleaning groove 414. The base 412 is T-shaped, with its lower end inserted into the movable frame 411 for installation and fixation, and its upper end recessed to install and position the cleaning head 413. The inner wall of the cleaning groove 414 is provided with an elastic and high-temperature resistant cleaning layer 415. Specifically, the cleaning layer 415 is made of high-temperature resistant silicone and is used to clamp the blade of the hot cutting knife 33 for cleaning during use. In this application, a PLC control system and a corresponding hardware controller are electrically connected and control each component to achieve automation. When in use, the cleaning component 4 can set the automatic cleaning interval time according to the cutting speed of the hot cutting knife 33 to achieve automatic cleaning, ensure the blade life of the hot cutting knife 33, reduce the quality impact caused by diaphragm slag, and improve the sheet production yield.

[0048] In another embodiment, the cleaning layer 415 is adhesive to facilitate the adhesion of residues on the hot cutting blade 33, thereby keeping the hot cutting blade 33 clean.

[0049] Please refer to Figure 5 and Figure 6 The linear rodless cylinder is provided with guide frames 34 on both sides. The lower end of the guide frame 34 is installed on the base frame 322, and the upper end of the guide frame 34 is horizontally installed on the upper end of the linear rodless cylinder. When the material passes through, the guide frame 34 supports the material at the lower end, and the hot cutter 33 descends to cut the material. The guide frame 34 is provided with a groove 341 for the hot cutter 33 to descend and cut the material, which facilitates the hot cutter 33 to cut the material.

[0050] Please refer to Figure 5 and Figure 6 The horizontal portion of the upper end of the base platform 412 is higher than the guide frame 34, and the vertical portion of the lower end of the base platform 412 interacts within the clearance groove 341 to guide the cleaning head 413, so that the hot cutting blade 33 accurately falls into the cleaning groove 414.

[0051] Please refer to Figure 4 and Figure 5 A quick-release pressure block 325 is provided between the base frame 322 and the support frame 321. The quick-release pressure block 325 is L-shaped and snapped upside down. The upper horizontal part of the quick-release pressure block 325 is fixed on the base frame 322, and the lower vertical part is fixed on the support frame 321.

[0052] This application enables automatic cleaning of the hot cutting blade 33, achieving true full automation, improving the automation level in the lithium battery manufacturing process, reducing the risks caused by human intervention, and extending the lifespan of the cutting blade, thereby reducing equipment maintenance costs.

[0053] For further details, please refer to... Figure 4 , Figure 5 and Figure 6 The hot-cutting assembly 3 also includes a tool mounting section 35, a heating section 36, and a connecting section 37. The upper end of the tool mounting section 35 is configured as a horizontal mounting post 351, and the lower end is configured as a tool clamp 352 that holds the hot-cutting blade 33. The connecting section 37 is used to connect the tool mounting section 35 and the output end of the hot-cutting drive component 31. The tool mounting section 35 is used to mount the hot-cutting blade 33. The lower end of the connecting section 37 is connected to the upper end face of the mounting post 351, and the connecting section 37 is slidably connected to the crossbeam. The upper end of the connecting section 37 passes through the crossbeam and is connected to the hot-cutting drive component 31. The heating section 36 includes a heating rod 361 and a thermocouple 362. The heating rod 361 is embedded in the tool clamp 352 and is energized to heat the hot-cutting blade 33 and melt the material for cutting. The thermocouple 362 is used to detect and feed back the real-time temperature through the PLC control system to achieve automatic temperature control.

[0054] Please refer to Figure 4 , Figure 5 and Figure 6 The tool mounting part 35 is connected to several guide parts 38. The guide parts 38 are configured as vertical guide posts 381. Multiple guide posts 381 are evenly distributed on the upper end of the mounting post 351. One end of the guide post 381 is fixed to the upper end of the mounting post 351, and the other end of the guide post 381 passes through the crossbeam in the vertical direction and is slidably connected to the crossbeam. The upper end of the guide post 381 has a limiting ring to prevent the guide post 381 from disengaging. The guide post 381 is connected to the crossbeam by a linear bearing 382 to ensure the up-and-down movement accuracy of the hot cutting tool 33.

[0055] Please refer to Figure 4 , Figure 5 and Figure 6An elastic buffer part 39 is provided on the guide part 38. The elastic buffer part 39 connects the guide part 38 and the hot cutting frame 32. In this embodiment, the elastic buffer part 39 is a buffer spring. The buffer spring is sleeved on the guide post 381, and one end of the buffer spring abuts against the mounting post 351 and the other end abuts against the linear bearing 382 to buffer the downward stroke of the hot cutting knife 33. When the hot cutting knife 33 descends to cut the material, the buffer spring is in a stretched state. After the hot cutting is completed, it automatically rises and resets under the action of the buffer spring.

[0056] For further details, please refer to... Figure 1 , Figure 2 and Figure 7 The feeding assembly 2 includes a feeding frame 21 and a traction part and a feeding drive 25 disposed on the feeding frame 21. The traction part is rotatably mounted on the feeding frame 21, and the feeding drive 25 is disposed on the feeding frame 21 and is used to drive the traction part to rotate. The traction part is perpendicular to the feeding direction and is used to pull the material to achieve feeding.

[0057] For details, please refer to Figure 7 The traction unit includes a main drive roller 22, a pressure roller 23, and a pressure roller drive unit 24. The feeding frame 21 is configured with a "U"-shaped structure similar to the hot cutting frame 32. The main drive roller 22 is arranged laterally and its two ends are rotatably mounted on the feeding frame 21. The feeding drive unit uses a drive motor, which is mounted on the feeding frame 21, and the output shaft of the drive motor is connected to the main drive roller 22 via a coupling. The pressure roller 23 is parallel to and higher than the main drive roller 22. The pressure roller drive unit 24 consists of two sets of drive cylinders. The pressure roller drive unit 24 is mounted on the feeding frame 21, and the telescopic rod of the pressure roller drive unit 24 is arranged vertically downward. The two ends of the pressure roller 23 are rotatably mounted on the telescopic rods of the two sets of drive cylinders through connecting seats, thereby achieving material clamping and traction through lifting and lowering.

[0058] In this embodiment, both the drive motor and the drive cylinder are electrically connected to the controller and their steering, speed, and extension / retraction are controlled by a PLC control system.

[0059] For further details, please refer to... Figure 1 and Figure 8 The detection component 5 includes a detection frame 51 and an industrial camera 52 mounted on the detection frame 51. The industrial camera 52 can be equipped with a CCD camera to detect the spacing between adjacent electrodes, and a subsequent size detection camera to detect the size of the composite unit. The main drive roller 22 pulls and drives the material to be fed, traveling a fixed length of double sheet width. When it reaches the detection position of the CCD camera, the feeding stops. The camera takes a picture to confirm the spacing between adjacent electrodes and feeds it back to the main drive roller 22 to achieve compensation for the current sheet correction NS. The size of the composite unit is detected by the subsequent size detection camera and fed back to the PLC control system. After calculation, it is fed back to the main drive roller 22 for compensation to complete the overall closed loop.

[0060] Please refer to Figure 2 , Figure 9 and Figure 10 The hot cutting drive unit 31 includes a cutter power seat 311 and a power motor 312, a transmission part 313, an eccentric part 314, a holding part 315, and a limiting part 316 mounted on the cutter power seat 311. The eccentric part 314 includes a rotating shaft 3141 and a turntable 3142 coaxially connected. An eccentric connection position is provided on the turntable 3142, and an offset bearing 3143 parallel to the rotating shaft 3141 is provided at this connection position. The cutter power seat 311 is adapted to be mounted on the hot cutting frame 32, the feeding frame 21, and the inspection frame 51. The transmission part 313 adopts a transmission wheel module to connect and drive the power motor 312 and the rotating shaft 3141, so that the power motor 312 drives the rotating shaft 3141 to rotate, thereby giving the eccentric bearing 3143 a stroke in the height direction.

[0061] Please refer to Figure 9 and Figure 10 The pressing part 315 includes a pressing plate 3151 and a lower pressing bearing 3152. The pressing plate 3151 has an adjustment groove 3153 for the offset bearing 3143 to extend into. The height of the adjustment groove 3153 is adapted to the offset bearing 3143. The length of the adjustment groove 3153 in the lateral direction is longer than the stroke length of the offset bearing 3143. The limiting part 316 is provided on both sides of the pressing plate 3151 to limit the offset of the pressing plate 3151 in the lateral direction. When the offset bearing 3143 rotates with the turntable 3142, it drives the pressing plate 3151 to rise and fall in the vertical direction. The lower pressing bearing 3152 is provided on the pressing plate 3151 and presses against the upper end of the connecting part 37.

[0062] Specifically, the pressure plate 3151 drives the rotating shaft 3141 to move via the rotation of the power motor 312. The rotational motion of the rotating shaft 3141 is converted into linear up-and-down motion through the cooperation of the offset bearing 3143 and the pressure plate 3151. The downward bearing 3152 pushes the connecting part 37 to drive the hot cutting blade 33 to descend. The linear bearing 382 and the guide part 38 ensure the accuracy of the up-and-down motion. The heating rod 361 heats the blade of the hot cutting blade 33 to the set temperature. The real-time temperature is fed back through the thermocouple 362 to achieve automatic temperature control. After the material belt is conveyed to the set position, the hot cutting blade 33 descends and melts the diaphragm at high temperature. The hot cutting blade 33 rises and automatically resets, and this process is repeated.

[0063] Please refer to Figure 1 and Figure 2 The workbench 1 is provided with a guide rail 11 and a moving table 12. The guide rail 11 is set along the feeding direction in the length direction and supports the positioning detection component 5, the feeding component 2 and the hot cutting component 3. The support frame 321 of the hot cutting frame 32 near the detection component 5 is installed on the upper end of the moving table 12. The lower end of the moving table 12 is set with a guide groove that cooperates with the guide rail 11. The guide groove is locked in the guide rail 11 and can slide along the guide rail 11.

[0064] Please refer to Figure 1 and Figure 11 The cutting tool correction assembly 6 includes a correction mounting frame 61, a correction motor 62, a correction lead screw 63, and a correction connecting block 64. The correction mounting frame 61 is connected to the worktable 1 and is located below the moving table 12. The correction motor 62 is mounted on the correction mounting frame 61. The correction lead screw 63 is set along the feeding direction and rotatably mounted on the correction mounting frame 61. The correction motor 62 and the correction lead screw 63 are coaxially connected through a coupling. A sliding seat is threaded onto the correction lead screw 63. The sliding seat is guided by the correction mounting frame, so that the rotation of the lead screw drives the sliding seat to move in a straight line. The upper end of the correction connecting block 64 is connected to the moving table 12, and the lower end is connected to the sliding seat.

[0065] The overall correction logic of the hot cutting mechanism of the lithium battery stacking machine in this application is as follows: the position of two adjacent composite sheets relative to the hot cutting blade 33 is detected and located by the CCD camera. The first-level sheet is offset from the set position by the first correction value, which is fed back to the feeding component 2. The feeding length is compensated by the three sets of feeding components 2 to eliminate the first offset value. The second-level sheet is offset from the set position by the second correction value. The hot cutting component 3 is adjusted by the cutting blade correction component 6 to compensate for the offset of the two composite sheets.

[0066] In this application, a CCD camera is used in conjunction with the main drive roller 22 for correction, the cutter for correction, and a size detection camera to achieve a closed loop for sheet size control. The sheet yield can reach 99.5%, which greatly reduces the defect losses caused by the sheet production process in lithium battery manufacturing, significantly improves the utilization rate of raw materials, and reduces the production cost of lithium batteries. Moreover, the equipment cost is low, only 1 / 25 of the cost of laser cutting. At the same time, an automatic blade cleaning component 4 is designed, which can be set to automatically clean at a set time, realizing fully automatic operation of the mechanism without human intervention, and making the structure more stable.

[0067] This application's solution enables the bag-making and cutting of negative electrode composite material strips during lithium battery production, improving the automation level of the battery sheet-making process, making the size yield more controllable, and increasing equipment capacity. For conventional high-speed, high-capacity battery bag-making and cutting equipment, it can effectively improve equipment performance indicators, significantly increase the yield and quality of bag making and cutting, while reducing manpower input in the production process and eliminating the need for frequent maintenance.

[0068] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A hot cutting mechanism for a lithium battery cutting and stacking machine, used for cutting composite material strip separators, characterized in that, include: Workbench (1); The feeding assembly (2) is used to support and drive the material to move along the feeding direction on the worktable (1); A hot-cutting assembly (3) is disposed along the material feeding path in the feeding direction, including a hot-cutting drive (31), a hot-cutting frame (32), and a hot-cutting blade (33) disposed on the hot-cutting frame (32), wherein the hot-cutting blade (33) is disposed perpendicular to the feeding direction, and the hot-cutting drive (31) is connected to the hot-cutting blade (33) to drive the hot-cutting blade (33) to cut the material; and The blade cleaning assembly (4) includes a blade cleaning part (41) and a blade cleaning drive (42). The blade cleaning part (41) has a cleaning groove (414) for wrapping the blade of the hot cutting blade (33). The blade cleaning drive (42) is connected to the blade cleaning part (41) and drives the blade cleaning part (41) to move along the length direction of the hot cutting blade (33).

2. The hot cutting mechanism of the lithium battery stacking machine as described in claim 1, characterized in that, The hot cutting machine frame (32) is provided with a cleaning mounting bracket (43) parallel to the hot cutting blade (33), and the cleaning mounting bracket (43) is located below the hot cutting blade (33). The cleaning drive member (42) is connected to the cleaning mounting bracket (43) to drive the cleaning part (41) to move along the length direction of the hot cutting blade (33).

3. The hot cutting mechanism of the lithium battery stacking machine as described in claim 1, characterized in that, The inner wall of the cleaning groove (414) is provided with an elastic and high-temperature resistant cleaning layer (415), which is used to hold the blade of the hot cutting knife (33).

4. The hot cutting mechanism of the lithium battery stacking machine as described in claim 3, characterized in that, The cleaning layer (415) is adhesive.

5. The hot cutting mechanism of the lithium battery stacking machine as described in claim 1, characterized in that, The hot cutting assembly (3) further includes a tool mounting part (35), a heating part (36) and a connecting part (37). The connecting part (37) is used to connect the tool mounting part (35) and the output end of the hot cutting drive (31). The tool mounting part (35) is used to mount the hot cutting blade (33). The heating part (36) is disposed on the tool mounting part (35) and heats the hot cutting blade (33).

6. The hot cutting mechanism of the lithium battery stacking machine as described in claim 5, characterized in that, The tool mounting part (35) is connected to a plurality of guide parts (38). One end of the guide part (38) is fixed to the tool mounting part (35), and the other end of the guide part (38) is slidably connected to the hot cutting frame (32) along the cutting direction. The length direction of the guide part (38) is parallel to the cutting direction.

7. The hot cutting mechanism of the lithium battery stacking machine as described in claim 6, characterized in that, An elastic buffer (39) is provided on the guide (38), and the elastic buffer (39) connects the guide (38) and the hot cutting frame (32).

8. The hot cutting mechanism of the lithium battery stacking machine as described in claim 1, characterized in that, The feeding assembly (2) includes a feeding frame (21) and a traction part and a feeding drive (25) disposed on the feeding frame (21). The traction part is rotatably mounted on the feeding frame (21). The feeding drive (25) is disposed on the feeding frame (21) and is used to drive the traction part to rotate. The traction part is perpendicular to the feeding direction and is used to pull the material.

9. The hot cutting mechanism of the lithium battery stacking machine as described in claim 1, characterized in that, The hot-cutting assembly (3) is provided in two sets, and a feeding assembly (2) is provided on both sides of each hot-cutting assembly (3).

10. The hot cutting mechanism of the lithium battery stacking machine as described in claim 9, characterized in that, The workbench (1) is provided with a cutter correction assembly (6), which is connected to any of the hot cutting assemblies (3).

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