Preheating roller passing mechanism and preheating device

Abstract

The utility model discloses a preheating roller passing mechanism and a preheating device, the preheating roller passing mechanism comprises a heating roller, a conductive film, a cantilever shaft and an induction coil, the heating roller forms a cavity and a mounting port communicated with the cavity, and the conductive film is assembled in the cavity and attached to the inner side surface of the cavity; the cantilever shaft penetrates through the mounting opening and is inserted into the cavity, and the cantilever shaft is rotationally connected with the heating roller; the induction coil is wound on the outer surface, located in the cavity, of the cantilever shaft. Compared with the prior art, heat is generated through the eddy current effect of the conductive film and conducted to the outer side face of the heating roller, the preheating function of the pole piece or the diaphragm is achieved, the heating roller is further rotationally connected with the cantilever shaft, and when the pole piece or the diaphragm is conveyed on the running belt, the heating roller can rotate along with the cantilever shaft; and sliding friction between the heating roller and the pole piece or the diaphragm is avoided, so that the pole piece or the diaphragm is prevented from being abraded.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a preheating roller mechanism and a preheating device. Background Technology

[0002] The thermal lamination process for lithium-ion batteries (also known as thermal bonding or hot pressing lamination) is a key step in battery manufacturing. It primarily combines the positive electrode, negative electrode, and separator in a specific manner to form the core structure of the battery—the cell. This process uses heating and pressure to ensure a tight bond between the layers while maintaining good electrical and mechanical properties. Currently, in the thermal lamination process for lithium-ion batteries, because the electrode and separator thermal bonding rollers are in line contact, the contact time between the electrodes is extremely short under high-speed conditions. The heat conduction speed cannot keep up with the belt speed, resulting in poor uniformity and consistency in the bonding effect. Therefore, a preheating process for the electrodes and separator is needed before thermal bonding, preheating them to a certain temperature before they enter the thermal bonding rollers.

[0003] Conventional preheating processes employ a relatively complex heating oven, consisting of upper and lower heating plates and rollers, with the upper oven capable of opening and closing. This method occupies a significant amount of space, leading to reduced maintainability of the equipment. Utility Model Content

[0004] One objective of this utility model is to provide a preheating roller mechanism and a preheating device, which aims to solve the technical problem of large space occupation of preheating process equipment.

[0005] To achieve the above objectives, the present invention provides a solution as follows: a preheating roller mechanism, comprising a heating roller, a conductive film, a cantilever shaft, and an induction coil. The heating roller has a cavity and an mounting port communicating with the cavity. The conductive film is assembled in the cavity and attached to the inner surface of the cavity. The cantilever shaft passes through the mounting port and is inserted into the cavity, and the cantilever shaft and the heating roller are rotatably connected. The induction coil is wound around the outer surface of the cantilever shaft located in the cavity.

[0006] Optionally, the cantilever shaft has a passage and a through hole, the through hole connecting the passage and the cavity; the preheating roller mechanism also includes a rubber plug, the rubber plug being interference-fitted into the through hole, and the induction coil being sequentially passed through the passage and the rubber plug into the cavity.

[0007] Optionally, the preheating roller mechanism further includes a first thermally conductive adhesive, which is filled in the passageway.

[0008] Optionally, the preheating roller mechanism further includes a thermometer, which is assembled in the passage and electrically connected to the induction coil.

[0009] Optionally, the preheating roller mechanism further includes an insulating pad, which is wrapped around the outer surface of the cantilever shaft located in the cavity, and the insulating pad is disposed between the induction coil and the cantilever shaft.

[0010] Optionally, the preheating roller mechanism further includes a bearing and a dust cover. The bearing is assembled at the mounting port, the cantilever shaft is rotatably connected to the heating roller through the bearing, and the dust cover is connected to the heating roller and covers the connection between the bearing and the heating roller.

[0011] Optionally, the dust cover includes a main body and a fastening part that are connected to each other. The main body has a rotating hole, the cantilever shaft passes through the rotating hole, and the main body covers the connection between the bearing and the heating roller. The fastening part and the heating roller are detachably connected.

[0012] Optionally, one of the fastening part and the heating roller is provided with a slot, and one of the fastening part and the heating roller is provided with a protrusion, the protrusion and the slot cooperating.

[0013] Optionally, the preheating roller mechanism further includes a second thermally conductive adhesive, which is filled in the cavity and connected to the conductive film and the induction coil, respectively.

[0014] To achieve the above objectives, the present invention provides a solution as follows: a preheating device, which includes: an electric system and a preheating roller mechanism as described above, wherein the induction coils of the electric system and the preheating roller mechanism are electrically connected.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a preheating roller mechanism and a preheating device. The preheating roller mechanism includes a heating roller, a conductive film, a cantilever shaft, and an induction coil. The heating roller has a cavity and an installation port communicating with the cavity. The conductive film is assembled in the cavity and attached to the inner side of the cavity. The cantilever shaft passes through the installation port and is inserted into the cavity. The cantilever shaft and the heating roller are rotatably connected. The induction coil is wound around the outer surface of the cantilever shaft located in the cavity. Compared with the prior art, this application generates heat through the eddy current effect of the conductive film and conducts the heat to the outer side of the heating roller to achieve the preheating function of the electrode or diaphragm. Furthermore, the heating roller is rotatably connected to the cantilever shaft. When the electrode or diaphragm is transported on the belt, the heating roller can rotate accordingly, avoiding sliding friction between the heating roller and the electrode or diaphragm, thereby preventing wear on the electrode or diaphragm. At the same time, since the heating roller is small in size, the preheating device using this preheating roller mechanism can effectively save device volume and greatly save space costs incurred by the preheating process. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the preheating roller mechanism provided in this embodiment of the utility model;

[0018] Figure 2 This is another structural schematic diagram of the preheating roller mechanism provided in this embodiment of the utility model;

[0019] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a schematic diagram of the filling of the second thermally conductive adhesive provided in this embodiment of the present invention;

[0021] Figure 5 yes Figure 4 Enlarged view of point B in the image.

[0022] Explanation of reference numerals: 10, heating roller; 20, conductive film; 30, cantilever shaft; 40, induction coil; 50, first thermally conductive adhesive; 60, thermometer; 70, insulating pad; 80, bearing; 90, dust cover; 100, second thermally conductive adhesive; 101, cavity; 102, mounting port; 103, slot; 301, passageway; 302, through hole; 901, main body; 902, fastening part; 9011, rotating hole; 9021, latching protrusion. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 The present invention provides a preheating device, which includes a preheating roller mechanism and an electric system (not shown in the figure). The electric system is electrically connected to the preheating roller mechanism to provide heating current to the preheating roller mechanism.

[0025] Please refer to it again. Figure 1 The aforementioned preheating roller mechanism includes a heating roller 10, a conductive film 20, a cantilever shaft 30, and an induction coil 40. The heating roller 10 has a cavity 101 and a mounting port 102 communicating with the cavity 101. The conductive film 20 is assembled in the cavity 101 and attached to the inner side of the cavity 101. The cantilever shaft 30 passes through the mounting port 102 and is inserted into the cavity 101. The cantilever shaft 30 and the heating roller 10 are rotatably connected. The induction coil 40 is wound around the outer surface of the cantilever shaft 30 located in the cavity 101.

[0026] In practical applications, the heating roller 10 is used to preheat the electrode or diaphragm, at least partially wrapping the electrode or diaphragm on the outer surface of the heating roller 10. The cantilever shaft 30 extends from the mounting port 102 of the heating roller 10 into the cavity 101, and its opposite ends can be rotatably connected to the heating roller 10. The outer surface of the part of the cantilever shaft 30 that extends into the cavity 101 is wound with multiple turns of induction coil 40. The induction coil 40 is electrically connected to the power system, and the power system provides alternating current to the induction coil 40. The induction coil 40 generates an electromagnetic field under the action of the alternating current. Under the action of the electromagnetic field, eddy currents are generated inside the conductive film 20. Due to the thermal effect of the eddy currents, the conductive film 20 generates heat. The conductive film 20 is attached to the inner side of the heating roller 10, so the heat on the conductive film 20 can be directly conducted to the outer surface of the heating roller 10, and then conducted to the electrode or diaphragm through the heating roller 10.

[0027] Compared to existing technologies, this application generates heat through the eddy current effect of the conductive thin film 20 and conducts the heat to the outer surface of the heating roller 10, thereby preheating the electrode or diaphragm. Furthermore, the heating roller 10 is rotatably connected to the cantilever shaft 30, allowing it to rotate as the electrode or diaphragm is transported on the belt, preventing sliding friction between the heating roller 10 and the electrode or diaphragm and thus avoiding wear. Simultaneously, due to the small size of the heating roller 10, this preheating device with a preheating roller mechanism effectively saves space and significantly reduces the space costs associated with the preheating process.

[0028] It should be noted that the heating roller 10 can be made of carbon fiber. Carbon fiber has high thermal conductivity, which can improve the heat transfer efficiency of the conductive film 20. Furthermore, carbon fiber can insulate against the conductive film 20, preventing electrical connection between them. In other embodiments, the induction coil 40 can be replaced with other structures that generate electromagnetic fields, such as electromagnets, permanent magnets, or Helmholtz coils.

[0029] Please refer to it again. Figure 1 The cantilever shaft 30 has a passage 301 and a through hole 302, and the through hole 302 connects the passage 301 and the cavity 101; the preheating roller mechanism also includes a rubber plug, which is interference-fitted in the through hole 302, and the induction coil 40 passes through the passage 301 and the rubber plug in sequence to the cavity 101.

[0030] In practical applications, the induction coil 40 needs to be combined with the power system to form a closed circuit in order to generate an electromagnetic field. Therefore, the part of the cantilever shaft 30 that extends into the cavity 101 is provided with an interconnected passage 301 and a through hole 302. One end of the induction coil 40 is electrically connected to the power system, and the other end can extend into the passage 301 and extend out of the through hole 302 to the outside of the cantilever shaft 30. At the same time, it is wound on the outer surface of the cantilever shaft 30. After being wound to a preset number of turns, it extends into the passage 301 from the through hole 302 and extends out of the passage 301 to be electrically connected to the power system. Thus, a complete closed circuit is formed, which makes it convenient for the power system to provide alternating current to the induction coil 40.

[0031] Meanwhile, after the induction coil 40 is installed, the rubber plug is inserted into the through hole 302 to prevent dust and avoid impurities from entering the cavity 101 and affecting the electromagnetic field generated by the induction coil 40.

[0032] It should be noted that one or more through holes 302 can be provided. The induction coil 40 can enter and exit the passage 301 from the same through hole 302, or it can enter the cavity 101 from one through hole 302 and extend out of the passage 301 from another through hole 302. This application does not limit this.

[0033] Please see Figure 2 The preheating roller mechanism also includes a thermometer 60, which is assembled in the passage 301 and electrically connected to the induction coil 40. In practical applications, the thermometer 60 is used to measure the temperature of the induction coil 40, controlling the temperature within a preset range to ensure that the electrode or diaphragm is heated in a constant and stable manner, avoiding any impact on the performance and lifespan of the electrode and diaphragm. The thermometer 60 can be a temperature sensor such as a thermocouple.

[0034] Please refer to it again. Figure 2 The preheating roller mechanism also includes a first thermally conductive adhesive 50, which is filled in the passage 301. The first thermally conductive adhesive 50 plays a role in uniform heat conduction. The induction coil 40 also generates heat after being energized. The first thermally conductive adhesive 50 can make the temperature of the induction coil 40 at various parts along the length of the cantilever shaft 30 uniform, thereby making the electromagnetic field generated by the induction coil 40 more uniform. This facilitates the uniformity of the heat generated by the eddy current effect of the conductive film 20 and improves the preheating quality of the electrode or diaphragm. The first thermally conductive adhesive 50 can also transfer the temperature of the induction coil 40 to the thermometer 60, improving the accuracy of the temperature measurement of the thermometer 60. In addition, the first thermally conductive adhesive 50 is waterproof and dustproof, preventing impurities from entering the passage 301 and affecting the electromagnetic field generated by the induction coil 40.

[0035] Please see Figure 3 The preheating roller mechanism also includes an insulating pad 70, which is wrapped around the outer surface of the cantilever shaft 30 located in the cavity 101. The insulating pad 70 is disposed between the induction coil 40 and the cantilever shaft 30.

[0036] In practical applications, the induction coil 40 is usually a metal coil. In order to prevent the induction coil 40 from being electrically connected to the cantilever shaft 30 and to avoid wear between the cantilever shaft 30 and the induction coil 40, an insulating pad 70 is provided between the induction coil 40 and the cantilever shaft 30. The insulating pad 70 is wrapped around the outer surface of the cantilever shaft 30, and the induction coil 40 is wound on the insulating pad 70. The insulating pad 70 can be made of a soft material to ensure insulated contact between the cantilever shaft 30 and the induction coil 40 and to protect the induction coil 40 from wear.

[0037] Please see Figure 4The preheating roller mechanism also includes a second thermally conductive adhesive 100, which fills the cavity 101 and is connected to the conductive film 20 and the induction coil 40. The second thermally conductive adhesive 100 primarily transfers heat from the conductive film 20 or the outer surface of the heating roller 10 to the temperature measuring element. The temperature measuring element accurately measures the real-time preheating temperature of the conductive film 20 or the outer surface of the heating roller 10, allowing operators to control the preheating temperature within a constant range and preventing overheating or underheating of the electrode or diaphragm. Furthermore, the second thermally conductive adhesive 100 filling the cavity 101 also provides support for the conductive film 20, ensuring a tighter fit between the conductive film 20 and the heating roller 10.

[0038] Please see Figure 4 and Figure 5 The preheating roller mechanism also includes a bearing 80 and a dust cover 90. The bearing 80 is assembled at the mounting port 102. The cantilever shaft 30 is rotatably connected to the heating roller 10 through the bearing 80. The dust cover 90 is connected to the heating roller 10 and covers the connection between the bearing 80 and the heating roller 10.

[0039] In practical applications, the cantilever shaft 30 extends from the mounting port 102 of the heating roller 10 into the cavity 101. The bearing 80 is usually assembled at the mounting port 102. The cantilever shaft 30 passes through the bearing 80 and extends into the cavity 101. The cantilever shaft 30 can abut against the bearing 80 to facilitate the positioning and installation of the cantilever shaft 30. The bearing 80 can reduce the rotational friction between the cantilever shaft 30 and the heating roller 10, reduce wear, and extend the service life of the mechanism. The dust cover 90 covers the end of the bearing 80 away from the heating roller 10. On the one hand, it fixes the bearing 80 and the heating roller 10 together. On the other hand, it plays a dustproof role to prevent external impurities from entering the heating roller 10.

[0040] Please refer to it again. Figure 5 The dust cover 90 includes a main body 901 and a fastening part 902 that are connected to each other. The main body 901 has a rotating hole 9011, through which the cantilever shaft 30 passes. The main body 901 covers the connection between the bearing 80 and the heating roller 10. The fastening part 902 and the heating roller 10 are detachably connected.

[0041] In practical applications, the dust cover 90 includes a main body 901 and a fastening part 902. The main body 901 has a rotating hole 9011 for the cantilever shaft 30 to pass through and rotate with the cantilever shaft 30 to prevent the main body 901 from affecting the relative rotation of the cantilever shaft 30 and the heating roller 10. The fastening part 902 is mainly used to connect with the heating roller 10 to prevent the dust cover 90 from falling off. The fastening part 902 can be detachably connected to the main body 901, which makes it easy to remove the dust cover 90, thereby facilitating the installation and disassembly of the entire mechanism and improving the assembly efficiency of the device.

[0042] Please refer to it again. Figure 5 In one embodiment, the fastening part 902 and the heating roller 10 can be connected by a detachable method such as fastening. One of the fastening part 902 and the heating roller 10 is provided with a groove 103, and the other of the fastening part 902 and the heating roller 10 is provided with a protrusion 9021, which engages with the groove 103. Specifically, the heating roller 10 has a groove 103, and the fastening part 902 has a protrusion 9021. When the main body 901 covers the bearing 80, the protrusion 9021 of the fastening part 902 is fastened in the groove 103, thereby connecting the dust cover 90 and the heating roller 10. When it needs to be removed, the dust cover 90 can be removed simply by separating the protrusion 9021 and the groove 103.

[0043] It is understandable that a locking protrusion 9021 can be provided on the heating roller 10, and a locking groove 103 can be provided on the fastening part 902, which can also achieve the above function.

[0044] Unlike existing technologies, this utility model provides a preheating roller mechanism and a preheating device. The preheating roller mechanism includes a heating roller 10, a conductive film 20, a cantilever shaft 30, and an induction coil 40. The heating roller 10 forms a cavity 101 and an installation port 102 communicating with the cavity 101. The conductive film 20 is assembled in the cavity 101 and attached to the inner side of the cavity 101. The cantilever shaft 30 passes through the installation port 102 and is inserted into the cavity 101. The cantilever shaft 30 and the heating roller 10 are rotatably connected. The induction coil 40 is wound around the outer surface of the cantilever shaft 30 located in the cavity 101. Compared to existing technologies, this application generates heat through the eddy current effect of the conductive thin film 20 and conducts the heat to the outer surface of the heating roller 10, thereby preheating the electrode or diaphragm. Furthermore, the heating roller 10 is rotatably connected to the cantilever shaft 30, allowing it to rotate as the electrode or diaphragm is transported on the belt, preventing sliding friction between the heating roller 10 and the electrode or diaphragm and thus avoiding wear. Simultaneously, due to the small size of the heating roller 10, this preheating device with a preheating roller mechanism effectively saves space and significantly reduces the space costs associated with the preheating process.

[0045] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0046] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0047] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0048] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A preheating roller mechanism, characterized in that, include: A heating roller having a cavity and a mounting port communicating with the cavity; A conductive film is assembled in the cavity and attached to the inner surface of the cavity; A cantilever shaft, passing through the mounting port and inserted into the cavity, is rotatably connected to the heating roller; and An induction coil is wound around the outer surface of the cantilever shaft located in the cavity.

2. The preheating roller mechanism according to claim 1, characterized in that, The cantilever shaft has a passageway and a through hole, and the through hole connects the passageway and the cavity. The preheating roller mechanism also includes a rubber plug, which is interference-fitted into the through hole, and the induction coil is sequentially passed through the passage and the rubber plug into the cavity.

3. The preheating roller mechanism according to claim 2, characterized in that, The preheating roller mechanism also includes a first thermally conductive adhesive, which is filled in the passageway.

4. The preheating roller mechanism according to claim 2, characterized in that, The preheating roller mechanism also includes a thermometer, which is assembled in the passage and electrically connected to the induction coil.

5. The preheating roller mechanism according to any one of claims 1 to 4, characterized in that, The preheating roller mechanism also includes an insulating pad, which is wrapped around the outer surface of the cantilever shaft located in the cavity, and the insulating pad is disposed between the induction coil and the cantilever shaft.

6. The preheating roller mechanism according to any one of claims 1 to 4, characterized in that, The preheating roller mechanism also includes a bearing and a dust cover. The bearing is assembled at the mounting port. The cantilever shaft is rotatably connected to the heating roller through the bearing. The dust cover is connected to the heating roller and covers the connection between the bearing and the heating roller.

7. The preheating roller mechanism according to claim 6, characterized in that, The dust cover includes a main body and a fastening part that are connected to each other. The main body has a rotating hole, through which the cantilever shaft passes. The main body covers the connection between the bearing and the heating roller. The fastening part and the heating roller are detachably connected.

8. The preheating roller mechanism according to claim 7, characterized in that, One of the fastening part and the heating roller is provided with a slot, and one of the fastening part and the heating roller is provided with a protrusion, the protrusion and the slot cooperating.

9. The preheating roller mechanism according to claim 4, characterized in that, The preheating roller mechanism also includes a second thermally conductive adhesive, which is filled in the cavity and connected to the conductive film and the induction coil, respectively.

10. A preheating device, characterized in that, The preheating device includes: an electric power system and a preheating roller mechanism as described in any one of claims 1 to 9, wherein the electric power system and the induction coil of the preheating roller mechanism are electrically connected.

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