Thermal compounding mechanism and lamination device

Abstract

The utility model discloses a thermal compounding mechanism and a lamination device, and the thermal compounding mechanism comprises a rack; each group of thermal compounding rollers comprises two compounding sub-rollers, the compounding sub-rollers are rotatably mounted on the rack, one of the two compounding sub-rollers can be close to or far away from the other one, and an extrusion gap is formed between the two compounding sub-rollers; wherein the extrusion gaps of the two adjacent groups of thermal compounding rollers are sequentially distributed along the feeding direction, and at least one of the two compounding sub-rollers in each group is constructed to be internal electromagnetic heating. According to the thermal compounding mechanism disclosed by the embodiment of the utility model, the at least two groups of thermal compounding rollers are arranged, and the compounding sub-rollers are constructed into internal electromagnetic heating, so that the surface temperature uniformity of the compounding sub-rollers is good, the compounding speed and the compounding quality of a negative plate and a diaphragm can be further improved, resource waste and production cost are reduced, the utilization rate is improved, and the use effect is better; and the application range is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery manufacturing, in particular to a thermal composite mechanism and a lamination device with the thermal composite mechanism. Background Art

[0002] Under the background of "dual carbon", China's new energy industry is developing rapidly. Lithium-ion batteries are widely used due to their high energy density, long service life, and green and pollution-free characteristics. With the development of new energy vehicles, the battery cells produced by the stacking process have better stability and can improve energy density in terms of space utilization. In the front-end stacking process, the negative electrode plate and the diaphragm need to be hot-pressed together, and then processed in the back-end.

[0003] At present, most of the thermal composite mechanisms of electrode and diaphragm have large temperature difference on the surface of the composite roller, which leads to low adhesion between the electrode and the diaphragm and poor composite quality. As a result, the diaphragm and the electrode are separated during transportation, which makes it easy for the diaphragm to fold, and then cause blockage and other risks in subsequent workstations, resulting in equipment shutdown, waste of manpower and material resources, increased costs, and low equipment utilization rate. There is room for improvement. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a thermal composite mechanism, which can improve the composite speed and composite quality of the negative electrode sheet and the separator, reduce resource waste and production costs, and improve the utilization rate.

[0005] According to the embodiment of the utility model, the thermal composite mechanism includes: a frame; at least two groups of thermal composite rollers, each group of the thermal composite rollers includes two composite sub-rollers, the composite sub-rollers are rotatably installed on the frame, and one of the two composite sub-rollers can be close to or away from the other, and an extrusion gap is formed between the two composite sub-rollers; wherein the extrusion gaps of two adjacent groups of the thermal composite rollers are distributed in sequence along the feeding direction, and at least one of the two composite sub-rollers in each group is constructed for internal electromagnetic heating.

[0006] According to the thermal composite mechanism of the embodiment of the utility model, by setting at least two groups of thermal composite rollers, and constructing the composite sub-rollers for internal electromagnetic heating, the surface temperature uniformity of the composite sub-rollers is good, thereby improving the composite speed and composite quality of the negative electrode sheet and the diaphragm, avoiding the separation of the diaphragm and the negative electrode sheet during transportation, reducing resource waste and production costs, improving utilization rate, and achieving better use effect and wider application range.

[0007] According to the thermal composite mechanism of some embodiments of the present invention, the thermal composite rollers are arranged in two groups, one of the two groups of thermal composite rollers is a feed composite roller and the other group is an edge-banding composite roller, and the feed composite rollers and the edge-banding composite rollers are distributed sequentially along the feeding direction.

[0008] According to the thermal laminating mechanism of some embodiments of the present invention, the axial length of the edge-sealing laminating roller is greater than the axial length of the feeding laminating roller.

[0009] According to the thermal composite mechanism of some embodiments of the present invention, the axial length of the edge-sealing composite roller is greater than or equal to the width of the portion of the negative electrode sheet having the pole ear.

[0010] According to some embodiments of the thermal composite mechanism of the present invention, it also includes two feed rollers, the two feed rollers are located on the feed side of at least two groups of the thermal composite rollers, and a feed gap is formed between the two feed rollers, and the feed gap and the extrusion gap are distributed sequentially along the feeding direction.

[0011] According to the thermal laminating mechanism of some embodiments of the present invention, the outer diameter of the feed roller is smaller than the outer diameter of the laminating sub-roller.

[0012] According to the thermal composite mechanism of some embodiments of the present invention, a tension swing roller is provided between two adjacent groups of thermal composite rollers, the tension swing roller is located in the feeding direction, and the tension swing roller is used to press the material strip in a direction intersecting with the feeding direction.

[0013] According to the thermal bonding mechanism of some embodiments of the present invention, the tension swing roller is connected to an elastic member, and the elastic member is used to apply an elastic force to the tension swing roller to press the material strip.

[0014] According to the thermal composite mechanism of some embodiments of the present invention, each group of the thermal composite rollers is also connected to a first driving member and a second driving member, the first driving member is used to drive one of the two composite sub-rollers to move closer to or away from the other, and the second driving member is used to drive the composite sub-rollers to rotate.

[0015] The utility model also provides a lamination device.

[0016] The lamination device according to the embodiment of the utility model is provided with any one of the above-mentioned thermal lamination mechanisms.

[0017] The lamination device and the above-mentioned thermal composite mechanism have the same advantages as those of the prior art, which will not be described in detail here.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 The structure of the thermal composite mechanism according to the embodiment of the utility model is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure of the thermal composite mechanism according to the embodiment of the utility model is shown in FIG. Figure 2 .

[0022] Figure 3 The structure of the thermal composite mechanism according to the embodiment of the utility model is shown in FIG. Figure 3 .

[0023] Reference numerals:

[0024] Thermal composite mechanism 100,

[0025] Frame 1, feeding composite roller 21, edge banding composite roller 22, extrusion gap 23, feeding roller 3, feeding gap 31, tension swing roller 4, first driving member 5, second driving member 6. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Reference below Figure 1-Figure 3 The thermal composite mechanism 100 according to the embodiment of the present invention can improve the composite speed and composite quality of the negative electrode sheet and the separator, reduce resource waste and production costs, and improve utilization rate.

[0030] like Figure 1-Figure 3 As shown, the thermal bonding mechanism 100 according to the embodiment of the present invention comprises: a frame 1 and at least two groups of thermal bonding rollers.

[0031] Each group of hot composite rollers includes two composite sub-rollers, which are rotatably mounted on the frame 1, and one of the two composite sub-rollers can be close to or away from the other, and an extrusion gap 23 is formed between the two composite sub-rollers; wherein the extrusion gaps 23 of two adjacent groups of hot composite rollers are distributed sequentially along the feeding direction, and at least one of the two composite sub-rollers in each group is constructed for internal electromagnetic heating.

[0032] Specifically, the thermal composite mechanism 100 is provided with a frame 1, and the frame 1 is placed under the thermal composite mechanism 100 and is used to support the thermal composite mechanism 100 to a required height. The thermal composite mechanism 100 is also provided with a thermal composite roller, which can be used to thermally composite the negative electrode sheet and the diaphragm. The thermal composite roller is rotatably connected to the frame 1, and the thermal composite roller is provided in at least two groups, each group of thermal composite rollers is provided with two composite sub-rollers, the composite sub-rollers are installed on the frame 1 and are rotatable relative to the frame 1, the two composite sub-rollers are arranged vertically, and an extrusion gap 23 is formed between the two composite sub-rollers, the negative electrode sheet and the diaphragm can be placed in the extrusion gap 23, and at the same time, one of the two composite sub-rollers can be close to or away from the other, that is, the extrusion gap 23 formed between the two composite sub-rollers can be adjusted in size, so that the thermal composite roller can be suitable for negative electrode sheets and diaphragms of different thicknesses.

[0033] Further, at least two groups of thermal composite rollers are arranged in sequence along the feeding direction, wherein, Figure 1 As shown, the feeding direction is the first direction in the figure, each group of hot composite rollers is provided with two composite sub-rollers, and an extrusion gap 23 is formed between the two composite sub-rollers, so that the extrusion gaps 23 of two adjacent groups of hot composite rollers are distributed in sequence along the feeding direction, and at least one of the two composite sub-rollers in each group is constructed for internal electromagnetic heating, and the electromagnetic heating has high heating efficiency and good surface temperature uniformity of the composite sub-rollers.

[0034] When the hot composite rollers are in operation, the negative electrode sheet and the diaphragm can be placed in a group of hot composite rollers on the feeding side, the two composite sub-rollers can apply pressure to the negative electrode sheet and the diaphragm, and at least one of the two composite sub-rollers is electromagnetically heated to composite the negative electrode sheet and the diaphragm. At the same time, the two composite sub-rollers rotate to move the negative electrode sheet and the diaphragm along the feeding direction, so that the negative electrode sheet and the diaphragm after composited once are transported to the next group of hot composite rollers along the feeding direction to be composited and electromagnetically heated again. In this embodiment, two groups of hot composite rollers are provided, and the two composite sub-rollers are both constructed for electromagnetic heating, so that the negative electrode sheet and the diaphragm can be thermally composited twice, thereby improving the composite speed and composite quality of the negative electrode sheet and the diaphragm. In actual use, it can also be used as Figure 3 As shown, three groups of hot composite rollers are provided, and multiple groups of hot composite rollers may be provided according to the use requirements, and only one of the two composite sub-rollers may be constructed as electromagnetic heating, which has high flexibility in the settings.

[0035] According to the thermal composite mechanism 100 of the embodiment of the utility model, by setting at least two groups of thermal composite rollers, and constructing the composite sub-rollers to be internally electromagnetically heated, the surface temperature uniformity of the composite sub-rollers is good, thereby improving the composite speed and composite quality of the negative electrode sheet and the separator, avoiding the separation of the separator and the negative electrode sheet during transportation, reducing resource waste and production costs, improving utilization rate, and achieving better use effect and wider application range.

[0036] Among them, the utilization rate refers to the ratio of the actual production time (operation time) to the production time (load time). It is obtained by dividing the operation time of the machine equipment by the maximum load time. The lower the utilization rate, the lower the production efficiency of the machine equipment. Conversely, the higher the utilization rate, the higher the production efficiency of the machine equipment. The operation time refers to the load time minus the time for mold change, tool change, failure, adjustment, etc. Therefore, to improve the utilization rate, it is necessary to reduce the loss time of mold change, tool change, failure, and adjustment, and the temperature of electromagnetic heating is set to be lower than 120°C. On the premise of ensuring no damage, the higher the compounding pressure and compounding temperature, the faster the compounding speed.

[0037] In some embodiments, the heat composite rollers are arranged in two groups, one of which is a feed composite roller 21 and the other is an edge-sealing composite roller 22, and the feed composite roller 21 and the edge-sealing composite roller 22 are sequentially distributed along the feeding direction.

[0038] Specifically, the thermal composite mechanism 100 is provided with a thermal composite roller, which can be used to thermally composite the negative electrode sheet and the separator, and the thermal composite roller is rotatably connected to the frame 1, and the thermal composite roller is provided in two groups, such as Figure 1As shown, one of the two groups of thermal composite rollers is configured as a feed composite roller 21, and the other group is configured as an edge-banding composite roller 22. The feed composite roller 21 and the edge-banding composite roller 22 are distributed in sequence along the feeding direction, and the feed composite roller 21 is arranged on the thermal composite mechanism 100 close to the feed side, and the edge-banding composite roller 22 is located behind the feed composite roller 21.

[0039] Furthermore, one of the two composite sub-rollers of the feeding composite roller 21 can be a rubber roller, and the other can be a steel roller with a Teflon-coated surface, and the two composite sub-rollers of the edge-sealing composite roller 22 can both be steel rollers with a Teflon-coated surface. When the diaphragm and the negative electrode sheet are composited, the roller surfaces of the two composite sub-rollers of the feeding composite roller 21 are directly tangent to each other with no gap in between, and the gap between the two roller surfaces of the two composite sub-rollers of the edge-sealing composite roller 22 is smaller than the thickness of the negative electrode sheet and the diaphragm, that is, the negative electrode sheet and the diaphragm can be first thermally composited through the feeding composite roller 21, and then thermally composited again through the edge-sealing composite roller 22.

[0040] Among them, a pole ear is provided on one side of the negative electrode sheet. When the negative electrode sheet and the diaphragm are placed in the feeding composite roller 21 for thermal composite, the adhesion between the electrode sheet and the diaphragm on the side of the negative electrode sheet without the pole ear is low. When entering the extrusion gap 23 of the edge sealing composite roller 22 again, the side with low adhesion can be thermally composited again to avoid the separation of the diaphragm and the negative electrode sheet during the transportation process, thereby improving the composite quality of the negative electrode sheet and the diaphragm.

[0041] In some embodiments, the axial length of the edge-sealing composite roller 22 is greater than the axial length of the feeding composite roller 21 .

[0042] Specifically, two groups of thermal composite rollers are provided, one of the two groups of thermal composite rollers is provided as a feed composite roller 21, and the other group is provided as an edge-banding composite roller 22. The feed composite roller 21 is provided on the thermal composite mechanism 100 close to the feed side, and the edge-banding composite roller 22 is located behind the feed composite roller 21, that is, the negative electrode sheet and the diaphragm can be firstly thermally composited by the feed composite roller 21, and then thermally composited again by the edge-banding composite roller 22. The axial length of the feed composite roller 21 is provided to be smaller than the axial length of the edge-banding composite roller 22. After the negative electrode sheet and the diaphragm are thermally composited by the feed composite roller 21, the edge-banding composite roller 22 can thermally composite the negative electrode sheet and the diaphragm again to ensure the composite quality of the thermal composite, and the axial length of the edge-banding composite roller 22 is provided to be larger, so that when the edge-banding composite roller 22 thermally composites the negative electrode sheet and the diaphragm again, the thermal composite quality at the edge of the negative electrode sheet and the diaphragm can be ensured, so that the overall thermal composite quality of the negative electrode sheet and the diaphragm can be improved.

[0043] In some embodiments, the axial length of the edge-sealing composite roller 22 is greater than or equal to the width of the portion of the negative electrode sheet having the electrode tab.

[0044] Specifically, a pole ear is provided on one side of the negative electrode sheet. When the negative electrode sheet and the separator are placed in the feeding composite roller 21 for thermal composite, the adhesion between the electrode sheet and the separator on the side of the negative electrode sheet without the pole ear is low. The axial length of the edge-sealing composite roller 22 is set to be greater than or equal to the width of the portion of the negative electrode sheet with the pole ear, so that the negative electrode sheet and the separator after thermal composite once enter the extrusion gap 23 of the edge-sealing composite roller 22 again, and the side with low adhesion can be thermally composited again, that is, the portion of the negative electrode sheet with the pole ear can be thermally composited again, so as to avoid the separation of the separator and the negative electrode sheet during the transportation process, thereby improving the composite quality of the negative electrode sheet and the separator.

[0045] In some embodiments, the thermal composite mechanism 100 further includes two feed rollers 3, which are located at the feed side of at least two groups of thermal composite rollers, and a feed gap 31 is formed between the two feed rollers 3, and the feed gap 31 and the extrusion gap 23 are distributed sequentially along the feeding direction.

[0046] Specifically, Figure 1 As shown, the thermal composite mechanism 100 is further provided with two feed rollers 3, and the two feed rollers 3 are arranged at the starting end along the feeding direction, that is, the two feed rollers 3 are located at the feed side of at least two groups of thermal composite rollers, and the at least two groups of thermal composite rollers are arranged in sequence along the feeding direction, and each group of thermal composite rollers is provided with two composite sub-rollers, and an extrusion gap 23 is formed between the two composite sub-rollers, and a feed gap 31 is formed between the two feed rollers 3, so that the feed gap 31 and the extrusion gap 23 are distributed in sequence along the feeding direction.

[0047] When the thermal composite mechanism 100 is in operation, the negative electrode sheet and the separator can be placed in the feed gap 31 of the two feed rollers 3. The two feed rollers 3 rotate, so that the negative electrode sheet and the separator move along the feeding direction, and then the negative electrode sheet and the separator are transported to the feed composite roller 21. The two composite sub-rollers of the feed composite roller 21 can apply pressure to the negative electrode sheet and the separator, and at least one of the two composite sub-rollers is electromagnetically heated to composite the negative electrode sheet and the separator. At the same time, the two composite sub-rollers of the feed composite roller 21 rotate, so that the negative electrode sheet and the separator move along the feeding direction, and then the negative electrode sheet and the separator after the composite once are transported to the edge-sealing composite roller 22 along the feeding direction, and then composite and electromagnetically heated again.

[0048] In some embodiments, the outer diameter of the feed roller 3 is smaller than the outer diameter of the composite sub-roller.

[0049] Specifically, two feed rollers 3 are arranged vertically and arranged on the feed side. A feed gap 31 is formed between the two feed rollers 3. When the hot composite mechanism 100 is in operation, the negative electrode sheet and the diaphragm can be placed in the two feed gaps 31. The feed rollers 3 are rotated to convey the negative electrode sheet and the diaphragm along the feeding direction to the feed composite roller 21, and then to the edge-sealing composite roller 22. The feed composite roller 21 and the edge-sealing composite roller 22 need to apply pressure to the negative electrode sheet and the diaphragm to composite the negative electrode sheet and the diaphragm. The feed roller 3 only plays a conveying role. The outer diameter of the feed roller 3 is set to be smaller than the outer diameter of the composite sub-roller, which can save manufacturing costs without affecting the composite quality, and can reduce the equipment quality and the space occupied.

[0050] In some embodiments, a tension swing roller 4 is provided between two adjacent groups of heat-combined rollers. The tension swing roller 4 is located in the feeding direction. The tension swing roller 4 is used to press the material strip in a direction intersecting with the feeding direction.

[0051] Specifically, Figure 1-Figure 2 As shown, a tension swing roller 4 is provided between two adjacent groups of hot composite rollers. After the negative electrode sheet and the diaphragm are conveyed to the feed composite roller 21 for hot composite via the feed roller 3, they can be conveyed to the tension swing roller 4 provided between the two adjacent groups of hot composite rollers. The tension swing roller 4 is located in the feeding direction. The tension swing roller 4 can press the material strip in the direction intersecting with the feeding direction, thereby adjusting the tension of the material strip, thereby avoiding the shaking of the negative electrode sheet and the diaphragm between the feed composite roller 21 and the edge-sealing composite roller 22 after one hot composite. Due to the speed difference between the feed composite roller 21 and the edge-sealing composite roller 22, the added tension swing roller 4 can prevent the material strip from being excessively relaxed or tightened, thereby preventing the material strip from being damaged. Moreover, the added tension swing roller 4 can make the material strip form an arc bread angle, thereby increasing the heating area and heating time of the diaphragm and the negative electrode sheet, thereby improving the composite effect of the diaphragm and the negative electrode sheet.

[0052] In some embodiments, the tension swing roller 4 is connected to an elastic member, and the elastic member is used to apply an elastic force to the tension swing roller 4 to press the material strip.

[0053] Specifically, a tension swing roller 4 is provided between two adjacent groups of hot composite rollers. The tension swing roller 4 is located in the feeding direction and is connected to an elastic member. The elastic member can apply elastic force to the tension swing roller 4 so that the tension swing roller 4 can be pressed toward the material belt, thereby preventing the material belt from being excessively loose or tight, thereby avoiding damage to the material belt, and avoiding shaking of the negative electrode sheet and the diaphragm between the feeding composite roller 21 and the edge sealing composite roller 22 after one hot composite, thereby improving the composite quality.

[0054] In some embodiments, each set of hot composite rollers is further connected to a first driving member 5 and a second driving member 6, wherein the first driving member 5 is used to drive one of the two composite sub-rollers to approach or move away from the other, and the second driving member 6 is used to drive the composite sub-rollers to rotate.

[0055] Specifically, Figure 1 As shown, each group of hot composite rollers is also connected to a first driving member 5 and a second driving member 6. The first driving member 5 can be set as a cylinder, and the second driving member 6 can be set as a motor. The first driving member 5 can drive one of the two composite sub-rollers to approach or move away from the other, that is, the first driving member 5 can adjust the composite pressure between the two composite sub-rollers, and the second driving member 6 is used to drive the composite sub-rollers to rotate. The hot composite mechanism 100 is also provided with an electrical proportional valve, which can control the first driving member 5 to adjust the composite pressure to 0.1MPa to 0.6MPa to adjust the pressure applied by the two composite sub-rollers to the negative electrode sheet and the diaphragm, and can control the running speed of the second driving member 6, thereby adjusting the speed at which the negative electrode sheet and the diaphragm are transported between the two composite sub-rollers, so that the hot composite mechanism 100 can be suitable for negative electrode sheets and diaphragms of different specifications, improve the versatility of the hot composite mechanism 100, and make the hot composite mechanism 100 more automated, saving manpower, and thus saving manufacturing costs.

[0056] The utility model also provides a lamination device.

[0057] The lamination device according to the embodiment of the present invention is provided with any one of the above-mentioned thermal bonding mechanisms 100 .

[0058] According to the lamination device of the embodiment of the utility model, the lamination device is provided with a thermal composite mechanism 100. The thermal composite mechanism 100 is provided with at least two groups of thermal composite rollers, and the composite sub-rollers are constructed with internal electromagnetic heating, so that the surface temperature uniformity of the composite sub-rollers is good, thereby improving the composite speed and composite quality of the negative electrode sheet and the diaphragm, avoiding the separation of the diaphragm and the negative electrode sheet during transportation, reducing resource waste and production costs, improving utilization rate, better use effect, and wider application range.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A thermal composite structure, characterized in that: include: frame; At least two groups of hot composite rollers, each group of the hot composite rollers includes two composite sub-rollers, the composite sub-rollers are rotatably mounted on the frame, and one of the two composite sub-rollers can be close to or away from the other, and an extrusion gap is formed between the two composite sub-rollers; The extrusion gaps between two adjacent groups of the hot composite rollers are sequentially distributed along the feeding direction, and at least one of the two composite sub-rollers in each group is configured for internal electromagnetic heating.

2. The thermal composite structure according to claim 1, characterized in that: The heat composite rollers are arranged in two groups, one of which is a feed composite roller and the other is an edge-sealing composite roller, and the feed composite rollers and the edge-sealing composite rollers are sequentially distributed along the feeding direction.

3. The thermal composite structure according to claim 2, characterized in that: The axial length of the edge-sealing composite roller is greater than the axial length of the feeding composite roller.

4. The thermal composite structure according to claim 3, characterized in that: The axial length of the edge-sealing composite roller is greater than or equal to the width of the portion of the negative electrode sheet having the pole ear.

5. The thermal composite structure according to claim 1, characterized in that: It also includes two feeding rollers, which are located at the feeding side of at least two groups of the thermal composite rollers, and a feeding gap is formed between the two feeding rollers. The feeding gap and the extrusion gap are distributed in sequence along the feeding direction.

6. The thermal composite structure according to claim 5, characterized in that: The outer diameter of the feed roller is smaller than the outer diameter of the composite sub-roller.

7. The thermal composite structure according to claim 1, characterized in that: A tension swing roller is provided between two adjacent groups of the heat composite rollers. The tension swing roller is located in the feeding direction and is used to press the material strip in a direction intersecting with the feeding direction.

8. The thermal composite structure according to claim 7, characterized in that: The tension swing roller is connected to an elastic member, and the elastic member is used to apply an elastic force to the tension swing roller to press the material strip.

9. The thermal composite structure according to claim 1, characterized in that: Each group of the hot composite rollers is also connected to a first driving member and a second driving member, wherein the first driving member is used to drive one of the two composite sub-rollers to approach or move away from the other, and the second driving member is used to drive the composite sub-rollers to rotate.

10. A lamination device, characterized in that: A thermal bonding mechanism according to any one of claims 1 to 9 is provided.

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