Hot shredding and laminating mechanism and lithium battery production line
By using a hot-cutting wire stacking mechanism to cut and reverse-tension the electrode sheets, the problem of uneven tension of the separator/electrode sheet during the Z-shaped stacking process is solved, thereby improving the production yield of lithium battery production equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-04-07
AI Technical Summary
In existing technologies, uneven tension distribution on both sides of the diaphragm/electrode during the Z-shaped lamination process leads to localized stress concentration and irreversible crease defects on the diaphragm/electrode surface, affecting the production yield of the equipment.
The electrode sheet is cut and reverse-tensioned by the hot-cutting wire assembly, and the stacking pressure knife ensures that the electrode sheet edges are subjected to consistent force, reducing wrinkles when the electrode sheet is folded.
It effectively reduces wrinkling caused by uneven stress during the Z-shaped stacking process of the electrode sheets, thereby improving the production yield of lithium battery production equipment.
Smart Images
Figure CN224096722U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery stacking technology, and in particular to a hot-cutting wire stacking mechanism and a lithium battery production line. Background Technology
[0002] With the continuous development of lithium-ion battery manufacturing processes, Z-shaped lamination technology has become an important process in power battery production due to its advantages in electrode structure consistency and energy density improvement. During the folding process, the electrode / separator needs to be pressed and supported to facilitate the folding. Existing technologies generally use a cantilevered lamination pressure knife structure for pressing, which applies vertical pressure to the electrode / separator through two symmetrically arranged lamination pressure knives. However, when the separator / electrode is folded in a Z-shape along the edge of the pressure knife, the thickness of the pressure knife causes uneven tension distribution on both sides of the separator / electrode. Especially in the area adjacent to the pressure knife, localized stress concentration occurs on the surface of the separator / electrode, leading to irreversible crease defects in that area and affecting equipment production yield.
[0003] In view of this, the purpose of this utility model is to provide a new technical solution to solve the existing technical problems. Utility Model Content
[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a hot-cutting wire stacking mechanism and a lithium battery production line, which solves the problem that the electrode sheets are prone to wrinkling during the stacking process.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A hot-cutting shred stacking mechanism includes a stacking table, a stacking pressure knife, a passing roller, and a hot-cutting shred mechanism;
[0007] The guide roller is located on one side of the stacking table to position the electrode sheet during stacking. The electrode sheet is released by the electrode sheet unwinding mechanism located on the top side of the guide roller.
[0008] The stacking pressure knife is movably disposed above the stacking table to press the electrode sheets on the stacking table;
[0009] The hot-cutting shredder includes a hot-cutting shredder assembly, a lateral movement assembly, and a lifting assembly. The lateral movement assembly is connected to the hot-cutting shredder assembly to drive the hot-cutting shredder assembly to move laterally, and the lifting assembly is connected to the hot-cutting shredder assembly to drive the hot-cutting shredder assembly to move up and down.
[0010] In the above structure, the hot-cutting wire assembly includes a hot-cutting wire and mounting blocks. Two mounting blocks are disposed at both ends of the hot-cutting wire, and the mounting blocks are connected to the transverse moving assembly.
[0011] In the above structure, the hot-cutting wire assembly further includes a tensioning shaft and a compression spring. The tensioning shaft and the compression spring are sleeved on the end of the hot-cutting wire and located on both sides of the mounting block.
[0012] In the above structure, the hot cutting shredder is provided with three sets of hot cutting shredder assemblies. The three sets of hot cutting shredder assemblies are arranged on the stacking table, and the transverse moving assembly and the lifting assembly are arranged in a one-to-one correspondence with the hot cutting shredder assemblies.
[0013] In the above structure, the transverse assembly includes a transverse bearing housing, a transverse lead screw, a transverse lead screw nut, and a transverse motor. The output shaft of the transverse motor is connected to the transverse lead screw. The transverse lead screw nut is rotatably sleeved on the transverse lead screw. Both ends of the transverse lead screw are rotatably connected to the transverse bearing housing.
[0014] In the above structure, the transverse assembly further includes a transverse mounting plate, the transverse bearing seat is fixedly mounted on the transverse mounting plate, the transverse mounting plate is provided with a transverse guide rail on the side opposite to the transverse lead screw, the hot cutting wire assembly is connected to a transverse block, the transverse block is connected to the transverse lead screw nut and slides on the transverse guide rail.
[0015] In the above structure, the lifting assembly includes a lifting bearing seat, a lifting screw, a lifting screw nut, and a lifting motor. The output shaft of the lifting motor is connected to the lifting screw, the lifting screw nut is rotatably sleeved on the lifting screw, and both ends of the lifting screw are rotatably connected to the lifting bearing seat.
[0016] In the above structure, the lifting assembly further includes a lifting mounting plate, which is fixedly connected to the lifting bearing seat. A lifting guide rail is provided on the side of the lifting mounting plate facing away from the lifting bearing seat. A connecting plate is provided at the end of the transverse mounting plate. The connecting plate is connected to the lifting screw nut and slides on the lifting guide rail.
[0017] This utility model also provides:
[0018] A lithium battery production line includes a hot-cutting wire stacking mechanism as described above.
[0019] The beneficial effects of this utility model are as follows: This utility model cuts the folded electrode sheet by setting a hot-cutting wire assembly, and flattens the side of the electrode sheet by using the entire heating wire to tension the diaphragm in the opposite direction, thereby ensuring that the edge of the electrode sheet is subjected to uniform force when the electrode sheet is folded in a Z-shape, effectively reducing the possibility of wrinkling due to uneven force on the electrode sheet during the stacking process; in addition, the hot-cutting wire assembly cooperates with the stacking pressure knife, and the position of the stacking pressure knife can be adjusted at will, further reducing the possibility of wrinkling of the electrode sheet. Attached Figure Description
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0021] Figure 1 This is a schematic diagram of the first working state of this utility model;
[0022] Figure 2 This is a schematic diagram of the hot-cutting wire mechanism of this utility model;
[0023] Figure 3 This is a schematic diagram of the structure of the hot-cutting wire assembly of this utility model;
[0024] Figure 4 This is a schematic diagram of the connection structure between the horizontal moving component and the lifting component of this utility model;
[0025] Figure 5 This is a schematic diagram of the second working state of this utility model;
[0026] Figure 6 This is a schematic diagram of the third working state of this utility model;
[0027] Figure 7 This is a schematic diagram of the fourth working state of this utility model.
[0028] Reference numerals: 1. Stacking table; 11. Stacking pressure knife; 2. Hot cutting shred mechanism; 21. Hot cutting shred assembly; 211. Hot cutting shred; 212. Mounting block; 213. Tensioning shaft; 214. Compression spring; 22. First hot cutting shred assembly; 23. Second hot cutting shred assembly; 24. Third hot cutting shred assembly; 25. Transverse movement assembly; 251. Transverse movement bearing seat; 252. Transverse movement screw; 253. Transverse movement screw nut; 254. Transverse movement motor; 255. Transverse movement mounting plate; 256. Transverse movement guide rail; 26. Lifting assembly; 261. Lifting bearing seat; 262. Lifting screw; 263. Lifting screw nut; 264. Lifting motor; 265. Lifting mounting plate; 266. Lifting guide rail; 27. Transverse movement block; 28. Connecting plate; 3. Overhead roller; 4. Electrode. Detailed Implementation
[0029] The following is in conjunction with the appendix Figure 1-7 The present invention will be further described below.
[0030] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.
[0031] Reference Figures 1 to 7 This utility model provides a hot-cutting wire stacking mechanism, which can be applied to the Z-shaped stacking of separator / electrode 4 / composite electrode 4 in lithium battery production. In this embodiment, the Z-shaped stacking applied to electrode 4 is described, which includes a stacking table 1, a stacking pressure knife 11, a roller 3 and a hot-cutting wire mechanism 2. The stacking table 1 is used to stack the electrode sheets 4. The stacking pressure knife 11 is movably arranged above the stacking table 1 to press the electrode sheets 4 on the stacking table 1 so as to fold and cut the electrode sheets 4. For example, it can be arranged in the four corners or the middle of the stacking table 1 to press the electrode sheets 4. The guide roller 3 is arranged on one side of the stacking table 1 to position the electrode sheets 4 during stacking. The electrode sheets 4 are released by the electrode sheet 4 unwinding mechanism located on the top side of the guide roller 3. The hot cutting wire mechanism 2 is arranged on one side of the stacking table 1. The hot cutting wire mechanism 2 can heat and cut the electrode sheets 4, and can also support the electrode sheets 4, which is conducive to the folding of the electrode sheets 4 and effectively reduces the generation of wrinkles when folding the sheets. The hot-cutting wire mechanism 2 includes a hot-cutting wire assembly 21, a traversing assembly 25, and a lifting assembly 26. The traversing assembly 25 is connected to the hot-cutting wire assembly 21 to drive the hot-cutting wire assembly 21 to perform traversal movements. The lifting assembly 26 is connected to the hot-cutting wire assembly 21 to drive it to perform lifting movements. The traversing movement of the hot-cutting wire assembly 21 can support and cut the electrode sheet 4 at different folding positions. The lifting movement of the hot-cutting wire assembly 21 can operate on the stacked electrode sheets 4 of different layers.
[0032] The stacking pressure knife 11 is positioned above the stacking table 1 and works in conjunction with the hot-cutting wire mechanism 2 to flatten and tension the electrode sheets 4. The stacking pressure knife 11 can be moved to any position on the stacking table 1, not limited to the four corners of the stacking table 1. The installation structure of the stacking pressure knife 11 is based on existing technology, such as using a cantilever structure positioned above the stacking table 1, etc., as long as the above functions can be achieved, and no single limitation is made here.
[0033] Reference Figure 2 and Figure 3Furthermore, the hot-cutting wire assembly 21 includes a hot-cutting wire 211 and mounting blocks 212. Two mounting blocks 212 are disposed at both ends of the hot-cutting wire 211, and the hot-cutting wire assembly 21 is connected to the transverse moving assembly 25 through the mounting blocks 212. During the Z-shaped stacking process, the driving transverse moving assembly 25 and the lifting assembly 26 cause the hot-cutting wire assembly 21 to act on the edge of the fold. The entire hot-cutting wire 211 can support and reverse tension the fold of the electrode sheet 4, making the electrode sheet 4 taut and the edge evenly stressed, effectively reducing the possibility of wrinkling of the electrode sheet 4 during folding.
[0034] It should be noted that in this embodiment, the heating of the hot-cut wire 211 is achieved by resistance heating, that is, by passing an electric current through the hot-cut wire 211, Joule heat is generated by utilizing the resistance characteristics of the metal material of the hot-cut wire 211, so that the hot-cut wire 211 is heated to the temperature required to melt the motor material; the heating of the hot-cut wire 211 can also be achieved by conducting heating with an external heat source, that is, by indirectly heating the hot-cut wire 211 through an external heating element; in other embodiments, other heating methods can also be used to heat the hot-cut wire 211, and no single method is limited here.
[0035] Furthermore, tensioning shafts 213 and compression springs 214 are fitted at both ends of the hot-cutting wire 211. The tensioning shaft 213 and compression spring 214 at the same end are respectively set on both sides of the mounting block 212. One end of the compression spring 214 abuts against the mounting block 212. The tensioning shaft 213 and compression spring 214 are set to adjust the tension of the hot-cutting wire 211 to ensure that the hot-cutting wire 211 remains taut during use and to prevent it from vibrating or loosening during the cutting process, which would lead to cutting deviation.
[0036] Reference Figure 2 and Figure 4 Furthermore, the transverse assembly 25 includes a transverse bearing housing 251, a transverse lead screw 252, a transverse lead screw nut 253, and a transverse motor 254. The output shaft of the transverse motor 254 is connected to the transverse lead screw 252 to drive the transverse lead screw 252 to rotate. The transverse lead screw nut 253 is sleeved on the transverse lead screw 252 to form a lead screw and nut structure. Both ends of the transverse lead screw 252 are rotatably connected to the transverse bearing housing 251. Specifically, the transverse bearing housing 251 is provided with bearings, and the transverse lead screw 252 is rotatably connected to the transverse bearing housing 251 through the bearings.
[0037] In this embodiment, the output shaft of the transverse motor 254 is connected to a coupling, and the transverse lead screw 252 is connected to the transverse motor 254 through the coupling to ensure the stability of the transmission.
[0038] The transverse assembly 25 also includes a transverse mounting plate 255, which is fixedly connected to the transverse bearing seat 251. A transverse guide rail 256 is provided on the side of the transverse mounting plate 255 facing away from the transverse lead screw 252, and the transverse guide rail 256 extends along the length of the transverse lead screw 252. A transverse block 27 is connected to the hot-cutting wire assembly 21. Specifically, the transverse block 27 is fixedly connected to the mounting block 212 and connected to the transverse lead screw nut 253. A transverse slider is fixedly connected to the side of the transverse block 27 facing the transverse mounting plate 255, and the transverse slider is slidably connected to the transverse guide rail 256.
[0039] During operation, the transverse motor 254 drives the transverse lead screw 252 to rotate, causing the transverse lead screw nut 253 to move along the length of the transverse lead screw 252, which in turn drives the transverse block 27 to slide on the transverse guide rail 256, thereby realizing the transverse movement of the hot cutting wire assembly 21.
[0040] Reference, Figure 2 and Figure 4 The lifting assembly 26 includes a lifting bearing seat 261, a lifting screw 262, a lifting screw nut 263, and a lifting motor 264. The output shaft of the lifting motor 264 is connected to the lifting screw 262 to drive the lifting screw 262 to rotate. The lifting screw nut 263 is sleeved on the lifting screw 262 to form a screw-nut structure. Both ends of the lifting screw 262 are rotatably connected to the lifting bearing seat 261. Specifically, the lifting bearing seat 261 is provided with bearings, and the lifting screw 262 is rotatably connected to the lifting bearing seat 261 through the bearings.
[0041] The lifting assembly 26 also includes a lifting mounting plate 265, which is fixedly connected to the lifting bearing seat 261. A lifting guide rail 266 is fixedly installed on the side of the lifting mounting plate 265 facing away from the lifting bearing seat 261, and the extension direction of the lifting guide rail 266 is parallel to the length direction of the lifting screw 262. The hot-cutting wire assembly 21 is slidably connected to the lifting guide rail 266. Specifically, a connecting plate 28 is provided at the end of the transverse mounting plate 255 near the lifting assembly 26. The connecting plate 28 is connected to the lifting screw nut 263, and a lifting slider is fixedly connected to the side of the connecting plate 28 facing the lifting mounting plate 265. The lifting slider is slidably connected to the lifting guide rail 266.
[0042] During operation, the lifting motor 264 drives the lifting screw 262 to rotate, causing the lifting screw nut 263 to move along the length of the lifting screw 262, which in turn drives the connecting plate 28 to slide on the lifting guide rail 266, thereby realizing the lifting movement of the hot cutting wire assembly 21.
[0043] In this embodiment, the output shaft of the lifting motor 264 is connected to a coupling, and the lifting screw 262 is connected to the lifting motor 264 through the coupling to ensure the stability of the transmission.
[0044] To ensure the stable operation of the lateral and lifting movements, in this embodiment, both the lateral lead screw 252 and the lifting lead screw 262 are ball screws.
[0045] For better description, in this embodiment, the length direction of the hot-cutting wire 211 is defined as the Y direction, the length direction of the transverse lead screw 252 is defined as the X direction, and the length direction of the lifting lead screw 262 is defined as the Z direction. That is, the transverse component 25 can drive the hot-cutting wire assembly 21 to translate in the X direction, and the lifting component 26 can drive the hot-cutting wire assembly 21 to translate in the Z direction.
[0046] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the hot-cutting shredder mechanism 2 is provided with three sets of hot-cutting shredder assemblies 21, which are arranged sequentially along the Y direction. Correspondingly, three sets of lateral movement assemblies 25 and lifting assemblies 26 are also provided, and are arranged one-to-one with the hot-cutting shredder assemblies 21, that is, each hot-cutting shredder assembly 21 can perform lateral movement and lifting action respectively. For better description, in this embodiment, the three hot-cutting shredder assemblies 21 are respectively defined as the first hot-cutting shredder assembly 22, the second hot-cutting shredder assembly 23, and the third hot-cutting shredder assembly 24. The three sets of lateral movement assemblies 25 and the three sets of lifting assemblies 26 are respectively defined as the first lateral movement assembly 25 and the first lifting assembly 26 connected to the first hot-cutting shredder assembly 22; the second lateral movement assembly 25 and the second lifting assembly 26 connected to the second hot-cutting shredder assembly 23; and the third lateral movement assembly 25 and the third lifting assembly 26 connected to the third hot-cutting shredder assembly 24.
[0047] The implementation principle of this application embodiment is as follows:
[0048] First, the stacking pressure knife 11 presses down on the side of the electrode 4 near the free end and the side near the pre-folded end of the electrode 4. Then, the first hot-cutting wire assembly 22 is driven to move along the X direction to the side near the pre-folded end of the electrode 4 (i.e., the first working state). Next, the roller 3 is driven to move along the X direction away from the first hot-cutting wire assembly 22 by a preset distance. At this time, the pre-folded end of the electrode 4 on this side is folded under the action of the first hot-cutting wire assembly 22. The electrode 4 is tensioned under the action of the hot-cutting wire 211, making it less prone to wrinkling, and the heating wire can also support the electrode 4. Simultaneously, the stacking pressure knife 11 is moved to press down on the side of the folded electrode 4 away from the first hot-cutting wire assembly 22. Then, the second hot-cutting wire assembly 23 is driven to move along the X direction away from the first hot-cutting wire assembly 22 to the pre-folded position on this side (i.e., the second working state). The roller 3 moves a preset distance along the X direction away from the second hot-cutting wire assembly 23, and the stacking blade 11 moves synchronously to press the electrode sheet 4. At this time, the first heating wire assembly heats and cuts the electrode sheet 4, and then drives the first heating assembly to continue moving a certain distance along the X direction away from the second hot-cutting wire assembly 23. Then, the third hot-cutting wire assembly 24 is driven to move along the X direction away from the second hot-cutting wire assembly 23 to the pre-folding position on that side (i.e., the third working state). The roller 3 is driven again to move a preset distance along the X direction away from the third hot-cutting wire assembly 24, and the stacking blade 11 moves synchronously to press the electrode sheet 4. The first hot-cutting wire assembly 22 is driven to move upward a certain distance along the Z direction, and then moves along the X direction away from the third hot-cutting wire assembly 24 to the pre-folding position of the electrode sheet 4 on that side (i.e., the fourth working state). Subsequently, for each layer of electrode sheet 4 stacked, the first hot-cutting wire assembly 22, the second hot-cutting wire assembly 23, and the third hot-cutting wire assembly 24 operate alternately in a cycle. For example, the first hot-cutting wire assembly 22 is used for the first and fourth layers of electrode sheet 4, the second hot-cutting wire assembly 2 is used for the second and fifth layers of electrode sheet 4, and the third hot-cutting wire assembly 2 is used for the third and sixth layers. The hot-cutting wire assembly 21 located at the bottom is heated to cut the electrode sheet 4, and the stacking platform 1 of the electrode sheet 4 on one side of each stack descends a certain distance.
[0049] This utility model also provides:
[0050] A lithium battery production line includes a hot-cutting wire stacking mechanism as described above.
[0051] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A hot-cutting filament stacking mechanism, characterized in that: Includes a stacking table, stacking pressure knife, passing rollers, and hot cutting mechanism; The guide roller is located on one side of the stacking table to position the electrode sheet during stacking. The electrode sheet is released by the electrode sheet unwinding mechanism located on the top side of the guide roller. The stacking pressure knife is movably disposed above the stacking table to press the electrode sheets on the stacking table; The hot-cutting shredder includes a hot-cutting shredder assembly, a lateral movement assembly, and a lifting assembly. The lateral movement assembly is connected to the hot-cutting shredder assembly to drive the hot-cutting shredder assembly to move laterally, and the lifting assembly is connected to the hot-cutting shredder assembly to drive the hot-cutting shredder assembly to move up and down.
2. The hot-cutting filament stacking mechanism according to claim 1, characterized in that: The hot-cutting wire assembly includes a hot-cutting wire and mounting blocks. Two mounting blocks are disposed at both ends of the hot-cutting wire, and the mounting blocks are connected to the transverse moving assembly.
3. The hot-cutting filament stacking mechanism according to claim 2, characterized in that: The hot-cutting wire assembly also includes a tensioning shaft and a compression spring, the tensioning shaft and the compression spring being sleeved on the end of the hot-cutting wire and located on both sides corresponding to the mounting block.
4. The hot-cutting filament stacking mechanism according to claim 1, characterized in that: The hot-cutting shredder is provided with three sets of hot-cutting shredders, which are arranged on the stacking table. The transverse moving component and the lifting component are arranged in a one-to-one correspondence with the hot-cutting shredders.
5. The hot-cutting filament stacking mechanism according to claim 1, characterized in that: The lateral movement assembly includes a lateral movement bearing housing, a lateral movement lead screw, a lateral movement lead screw nut, and a lateral movement motor. The output shaft of the lateral movement motor is connected to the lateral movement lead screw. The lateral movement lead screw nut is rotatably sleeved on the lateral movement lead screw. Both ends of the lateral movement lead screw are rotatably connected to the lateral movement bearing housing.
6. The hot-cutting filament stacking mechanism according to claim 5, characterized in that: The transverse assembly further includes a transverse mounting plate, the transverse bearing seat is fixedly mounted on the transverse mounting plate, the transverse mounting plate is provided with a transverse guide rail on the side opposite to the transverse lead screw, the hot cutting wire assembly is connected to a transverse block, the transverse block is connected to the transverse lead screw nut and slides on the transverse guide rail.
7. A hot-cutting filament stacking mechanism according to claim 6, characterized in that: The lifting assembly includes a lifting bearing seat, a lifting screw, a lifting screw nut, and a lifting motor. The output shaft of the lifting motor is connected to the lifting screw. The lifting screw nut is rotatably sleeved on the lifting screw. Both ends of the lifting screw are rotatably connected to the lifting bearing seat.
8. The hot-cutting filament stacking mechanism according to claim 7, characterized in that: The lifting assembly also includes a lifting mounting plate, which is fixedly connected to the lifting bearing seat. A lifting guide rail is provided on the side of the lifting mounting plate facing away from the lifting bearing seat. A connecting plate is provided at the end of the transverse mounting plate. The connecting plate is connected to the lifting screw nut and slides on the lifting guide rail.
9. A lithium battery production line, characterized in that: Includes the hot-cutting filament stacking mechanism as described in any one of claims 1-8.