Expansion roller equipment for lithium battery coating

Abstract

The invention discloses expansion roller equipment for lithium battery coating, and relates to the technical field of battery manufacturing. The roller core specifically comprises a roller core pipe body, and the at least one expansion assembly is arranged on the roller core pipe body and can expand or contract to adjust the pressing pressure on the surface of the battery core. The invention aims to enable a compression roller to dynamically adjust the pressing pressure according to the actual form change of the surface of a battery cell and effectively avoid bubbles and wrinkles when the battery cell is coated with a film.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing, and in particular to an expansion roller device for lithium battery coating. Background Art

[0002] With the continuous development of lithium battery technology, especially the growing demand for lithium batteries in new energy vehicles and consumer electronics, the manufacturing process and quality requirements of lithium batteries are becoming higher and higher. In the production of lithium batteries, the cell coating process is a crucial link.

[0003] At present, the commonly used rollers in battery production are usually of fixed hardness. That is, the setting of the hardness of the rubber roller is fixed and cannot be dynamically adjusted according to the specific conditions of the battery cell. However, there are often large differences in the flatness of the incoming battery cells, and some battery cells have obvious depressions or bulges on the surface, which makes it impossible to achieve a close fit with the surface of the battery cell when using a fixed hardness rubber roller. That is, the hardness of the rubber roller cannot be adjusted according to the surface morphology of the battery cell, resulting in uneven pressure on the surface of the battery cell during the rolling process. In the concave part of the battery cell, the pressing pressure is insufficient and the bubbles cannot be effectively discharged, so bubbles will form. In the convex part of the battery cell, the hardness of the roller may be too high, which will cause the coating material to be subjected to excessive pressure, squeezing out too much gas, resulting in bubbles or wrinkles.

[0004] Therefore, how to enable the pressing roller to dynamically adjust the pressing pressure according to the actual morphology changes on the battery cell surface and effectively avoid bubbles and wrinkles during battery cell coating has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The main purpose of the present invention is to provide an expansion roller device for lithium battery coating, which aims to enable the pressure roller to dynamically adjust the pressing pressure according to the actual morphological changes of the battery cell surface, so as to effectively avoid bubbles and wrinkles during battery cell coating.

[0006] In order to achieve the above object, the present invention provides an expansion roller device for lithium battery coating, comprising: Roller core tube; and At least one expansion component is arranged on the roller core tube body and can expand or contract to adjust the pressing pressure on the surface of the battery core.

[0007] The lamination pressure of the expansion roller can be automatically adjusted according to the actual state of the battery cell surface, thus avoiding the problem of bubbles and wrinkles caused by uneven lamination when the hardness of the traditional rubber roller is fixed. In this way, not only can the close contact between the battery cell surface and the coating material be ensured, but also the quality and production efficiency of the battery coating can be improved, the coating defects can be reduced, and the overall performance and safety of the battery can be improved.

[0008] In one embodiment of the present application, the expansion assembly comprises: An expansion bag, covering the roller core tube body; an injection pipe, wherein the roller core tube body is provided with a first through hole for the injection pipe to pass through, a first end of the injection pipe enters the roller core tube body from the first end of the roller core tube body and extends from the first through hole to communicate with the expansion bag, so as to inject a medium into the expansion bag; and A discharge pipe, wherein the roller core tube body is provided with a second through hole for the injection tube to pass through, and the first end of the discharge pipe enters the roller core tube body from the first end of the roller core tube body and extends from the second through hole to communicate with the expansion bag, so as to discharge the medium in the expansion bag.

[0009] It can effectively adjust the pressing pressure between the outer surface of the expansion roller and the battery cell. The expansion and contraction of the expansion bag is dynamically adjusted according to the changes in the surface morphology of the battery cell, and can adapt to the depressions or protrusions on the surface of the battery cell, avoiding the uneven pressing problem caused by the fixed hardness of the traditional rubber roller, thereby reducing the generation of defects such as bubbles and wrinkles. Through the synergistic effect of the injection tube and the discharge tube, the expansion and contraction process of the expansion bag is more controllable, ensuring the efficiency and consistency of the coating process.

[0010] In one embodiment of the present application, the expansion assembly is coated with a roller sleeve. Coating the expansion assembly with a roller sleeve can effectively improve the durability and working stability of the expansion roller device. As a protective layer of the expansion bag, the roller sleeve can effectively prevent the expansion bag from being damaged by external pressure or friction during operation, thereby extending the service life of the equipment. In addition, the roller sleeve also provides additional flexible support, helping the roller surface to form a more uniform contact pressure with the surface of the battery cell, reducing the problem of bubbles and wrinkles caused by uneven pressure.

[0011] In one embodiment of the present application, the first end of the roller sleeve abuts against the shoulder of the roller core tube body, a blocking ring is provided on the end of the roller core tube body away from the shoulder, and the second end of the roller sleeve abuts against the blocking ring.

[0012] The first end of the roller sleeve abuts against the shoulder of the roller core tube body, and the second end abuts against the blocking ring, which effectively solves the sliding and displacement problems of the roller sleeve during the operation of the expansion roller and ensures the stability and reliability of the equipment. The two-way fixed design of the shoulder and the blocking ring enables the roller sleeve to maintain a good positioning during the operation of the equipment, while protecting the expansion assembly from external pressure or friction, thereby extending the service life of the expansion roller.

[0013] In one embodiment of the present application, a rotating rotor is fixedly connected to the first end of the roller core tube body; The rotating rotor is provided with an injection channel corresponding to the injection pipe one by one, and the rotating rotor is provided with a discharge channel corresponding to the discharge pipe one by one; the rotating rotor is provided with an injection annular groove corresponding to and connected to the injection channel one by one, and the rotating rotor is provided with a discharge annular groove corresponding to and connected to the discharge channel one by one; The rotating rotor is rotatably connected to a rotating stator, the rotating stator is provided with an injection port corresponding to and connected to the injection annular groove, and the rotating stator is also provided with a discharge port corresponding to and connected to the discharge annular groove; The injection pipe is connected to the injection channel, and the discharge pipe is connected to the discharge channel.

[0014] Through the coordinated design of the rotating rotor and the rotating stator, dynamic medium control of the expansion bag is achieved while maintaining efficient operation of the equipment in a rotating state. The injection channel and the discharge channel set inside the rotating rotor cooperate with the annular groove to ensure the uniform distribution and rapid circulation of the medium, so that the expansion bag can adjust the pressing pressure in real time according to the morphology of the battery cell surface. The rotating stator provides stable injection and discharge ports to ensure stable pressure and no leakage during the medium transportation process. With this design, the expansion bag can operate efficiently regardless of the rotation state of the equipment, thereby avoiding the problem of uneven pressure of traditional rubber rollers at high speeds, and significantly improving the quality and efficiency of the battery cell coating.

[0015] In one embodiment of the present application, a sealing rubber ring is provided between the rotating rotor and the rotating stator for dividing each injection annular groove and / or discharge annular groove.

[0016] The sealing rubber ring is set between the rotating rotor and the rotating stator, which can effectively separate the injection annular groove and the discharge annular groove to prevent leakage or cross contamination of media between different channels. The sealing rubber ring provides a reliable sealing barrier to ensure accurate delivery of the media and improve the working efficiency and safety of the equipment.

[0017] In one embodiment of the present application, a slip ring rotor is connected to one end of the rotating rotor away from the roller core tube body, a first through hole is provided on the slip ring rotor, a second through hole is provided on the rotating rotor, the first through hole is connected to the second through hole, a power supply line is connected to the slip ring rotor, and the other end of the power supply line passes through the first through hole and the second through hole to be connected to the roller core tube body; and The slip ring rotor is rotatably connected with a slip ring stator, and the inner wall of the slip ring stator is provided with a first annular conductive head which can always keep in contact with the power supply line on the slip ring rotor.

[0018] The separation of power transmission and rotation functions of the expansion roller equipment is achieved through the structural design of the slip ring rotor and the slip ring stator. The slip ring rotor is connected to the rotating rotor, and provides continuous and stable power support for the equipment through the sliding contact between the power supply line and the circular conductive head of the slip ring stator. Regardless of the speed at which the equipment runs, the slip ring assembly can ensure the reliability of power supply, thereby ensuring the normal operation of the expansion roller. The design of the slip ring structure avoids the problem of line distortion or breakage caused by rotation in traditional power transmission methods, and improves the safety and stability of equipment operation.

[0019] In one embodiment of the present application, a second annular conductive head slidably connected to the first annular conductive head is provided on the outer side wall of the slip ring rotor, and a power supply line on the slip ring rotor is connected to the second annular conductive head.

[0020] The sliding connection design between the second annular conductive head on the outer wall of the slip ring rotor and the first annular conductive head on the inner wall of the slip ring stator achieves high efficiency and stability in the power transmission of the equipment. The setting of the second annular conductive head enables the slip ring rotor to always maintain the electrical connection of the power supply line in the rotating state, ensuring that the electronic control system of the expansion roller equipment works normally during the rotation process.

[0021] In one embodiment of the present application, an insulating sleeve is provided between the second annular conductive head and the slip ring rotor.

[0022] By arranging an insulating sleeve between the second annular conductive head and the slip ring rotor, complete electrical isolation between the conductive head and the rotor body is achieved, effectively improving the electrical safety of the equipment.

[0023] In one embodiment of the present application, the expansion bag is made of nylon material.

[0024] Nylon material has high tensile strength and tear resistance, and can maintain good shape and structural stability even under high pressure. This allows the expansion bag to withstand high internal pressure and external stress during expansion and contraction, preventing the expansion bag from rupturing or deforming due to excessive pressure.

[0025] The above technical solution can automatically adjust the pressing pressure of the expansion roller according to the actual state of the battery cell surface, thereby avoiding the problem of bubbles and wrinkles caused by uneven pressing when the hardness of the traditional rubber roller is fixed. In this way, not only can the close contact between the battery cell surface and the coating material be ensured, but also the quality and production efficiency of the battery coating can be improved, the coating defects can be reduced, and the overall performance and safety of the battery can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention; Figure 2 It is a structural schematic diagram of the roller core tube body of the present invention; Figure 3 It is a schematic diagram of the structure of the roller core tube body equipped with the expansion assembly of the present invention; Figure 4 for Figure 1 The cross-section at A in the middle; 10. Roller core tube body; 11. First through hole; 12. Second through hole; 13. Shaft shoulder; 14. Blocking ring; 21. Expansion bag; 22. Injection pipe; 23. Discharge pipe; 30. Roller sleeve; 40. Rotating stator; 41. Injection channel; 42. Discharge channel; 43. Injection annular groove; 44. Injection port; 45. Discharge port; 46. Sealing rubber ring; 47. Second through hole; 48. Rotating rotor; 49. Discharge annular groove; 50. Fixed bracket; 60. Slip ring stator; 61. Slip ring rotor; 62. First annular conductive head; 63. Second annular conductive head; 70. Insulating sleeve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0028] like Figures 1 to 4 As shown, in order to achieve the above-mentioned purpose, the present invention provides an expansion roller device for lithium battery coating, comprising: Roller core tube body 10; and At least one expansion component is disposed on the roller core tube body 10 and can expand or contract to adjust the pressing pressure on the surface of the battery cell.

[0029] Specifically, the roller core tube body 10 is made of metal material, such as aluminum alloy or stainless steel, and has certain strength and durability. The roller core tube body 10 is designed as a hollow structure, and is provided with a plurality of channels for medium injection and discharge. The channels are connected to the external expansion component to provide expansion medium for the expansion component.

[0030] The expansion component is arranged on the roller core tube body 10, and the expansion component can expand or contract by inputting gas, liquid or other medium, so as to adjust the pressing pressure when contacting with the surface of the battery cell.

[0031] In actual operation, the medium injection module is connected to the channel of the roller core tube body 10, and provides gas or liquid medium to the expansion assembly through the injection pipe 22. After the medium is injected, the expansion bag 21 expands, and the distance between the outer surface of the roller core tube body 10 and the surface of the battery cell is reduced, thereby changing the pressing force on the surface of the battery cell. The pressure of the medium can be controlled by the adjustment system to accurately adjust the pressure between the roller surface and the battery cell to adapt to the possible depression or bulging phenomenon on the surface of the battery cell.

[0032] The above technical solution can automatically adjust the pressing pressure of the expansion roller according to the actual state of the battery cell surface, thereby avoiding the problem of bubbles and wrinkles caused by uneven pressing when the hardness of the traditional rubber roller is fixed. In this way, not only can the close contact between the battery cell surface and the coating material be ensured, but also the quality and production efficiency of the battery coating can be improved, the coating defects can be reduced, and the overall performance and safety of the battery can be improved.

[0033] In one embodiment of the present application, the expansion assembly comprises: An expansion bag 21, covering the roller core tube body 10; an injection pipe 22, wherein the roller core tube body 10 is provided with a first through hole 11 through which the injection pipe 22 passes, and a first end of the injection pipe 22 enters the roller core tube body 10 from the first end of the roller core tube body 10 and extends out from the first through hole 11 to communicate with the expansion bag 21, so as to inject a medium into the expansion bag 21; and A discharge pipe 23 is provided on the roller core tube body 10 with a second through hole 12 for the injection pipe 22 to pass through. The first end of the discharge pipe 23 enters the roller core tube body 10 from the first end of the roller core tube body 10 and extends from the second through hole 12 to communicate with the expansion bag 21, so as to discharge the medium in the expansion bag 21.

[0034] Specifically, the expansion assembly includes an expansion bag 21, an injection pipe 22 and a discharge pipe 23, which are installed on the roller core tube body 10 and are used to adjust the contact pressure between the outer surface of the roller core tube body 10 and the surface of the battery cell. The expansion bag 21 is wrapped around the outside of the roller core tube body 10. When the medium in the expansion bag 21 is injected, the expansion bag 21 expands, and the contact pressure between the roller surface and the battery cell increases; when the medium in the expansion bag 21 is discharged, the expansion bag 21 contracts, and the contact pressure decreases.

[0035] The first end of the injection pipe 22 enters the roller core tube body 10 from the first end of the roller core tube body 10, and extends through the first through hole 11 to connect with the expansion bag 21, and is used to inject the medium into the expansion bag 21; the first end of the discharge pipe 23 also enters the roller core tube body 10 from the first end of the roller core tube body 10, and extends through the second through hole 12 to connect with the expansion bag 21, and is used to discharge the medium in the expansion bag 21. The design of the injection pipe 22 and the discharge pipe 23 ensures the inflow and outflow of the medium in the expansion bag 21, controls the expansion and contraction of the expansion bag 21, and thus realizes the pressure regulation on the surface of the battery cell.

[0036] In actual application, the medium (such as gas or liquid) enters the expansion bag 21 through the injection pipe 22, and the expansion bag 21 expands accordingly, so that the outer surface of the roller core tube body 10 increases the contact pressure on the surface of the battery cell. When the contact pressure needs to be reduced, the medium in the expansion bag 21 is discharged through the discharge pipe 23, the expansion bag 21 shrinks, and the pressure between the roller surface and the battery cell surface is reduced. The injection pipe 22 and the discharge pipe 23 are connected to the expansion bag 21 through the first through hole 11 and the second through hole 12 provided on the roller core tube body 10 to ensure the smooth flow of the medium.

[0037] The above technical solution can effectively adjust the pressing pressure between the outer surface of the expansion roller and the battery cell. The expansion and contraction of the expansion bag 21 is dynamically adjusted according to the changes in the surface morphology of the battery cell, and can adapt to the depression or protrusion on the surface of the battery cell, avoiding the problem of uneven pressing caused by the fixed hardness of the traditional rubber roller, thereby reducing the generation of defects such as bubbles and wrinkles. Through the synergistic effect of the injection tube 22 and the discharge tube 23, the expansion and contraction process of the expansion bag 21 is more controllable, ensuring the efficiency and consistency of the coating process.

[0038] In one embodiment of the present application, the expansion assembly is covered with a roller sleeve 30 .

[0039] By adopting the above technical solution, the expansion assembly is covered with a roller cover 30, which can effectively improve the durability and working stability of the expansion roller equipment. The roller cover 30, as a protective layer of the expansion bag 21, can effectively prevent the expansion bag 21 from being damaged by external pressure or friction during operation, thereby extending the service life of the equipment. In addition, the roller cover 30 also provides additional flexible support, helping the roller surface to form a more uniform contact pressure with the surface of the battery cell, reducing the problem of bubbles and wrinkles caused by uneven pressure.

[0040] In one embodiment of the present application, the first end of the roller sleeve 30 abuts against the shoulder 13 of the roller core tube body 10 , a blocking ring 14 is provided on the end of the roller core tube body 10 away from the shoulder 13 , and the second end of the roller sleeve 30 abuts against the blocking ring 14 .

[0041] Specifically, the roller sleeve 30 is coated on the outside of the expansion assembly to protect the expansion bag 21 and enhance the working stability of the expansion assembly. The first end of the roller sleeve 30 abuts against the shoulder 13 of the roller core tube 10, and the second end abuts against the blocking ring 14 disposed at one end of the roller core tube 10 away from the shoulder 13. Through the bidirectional positioning of the shoulder 13 and the blocking ring 14, the roller sleeve 30 can be kept fixed during the operation of the expansion roller device, avoiding the sliding or displacement of the roller sleeve 30 to affect the normal operation of the device or cause coating defects.

[0042] The shoulder 13 provides a fixing point for the roller sleeve 30, so that the roller sleeve 30 is stably connected at one end of the expansion roller; the blocking ring 14 limits the movement of the roller sleeve 30 at the other end. The blocking ring 14 achieves axial restriction on the roller sleeve 30 by being tightly connected with the roller core tube 10, ensuring that the roller sleeve 30 always remains stable during the battery core coating operation and does not move due to rotation, friction or other external forces during operation. The blocking ring 14 is made of high-temperature resistant and high-strength materials to meet the operating requirements of the equipment under long-term high load.

[0043] By adopting the above technical solution, the first end of the roller sleeve 30 abuts against the shoulder 13 of the roller core tube body 10, and the second end abuts against the blocking ring 14, which effectively solves the sliding and displacement problems of the roller sleeve 30 during the operation of the expansion roller, and ensures the stability and reliability of the equipment. The bidirectional fixing design of the shoulder 13 and the blocking ring 14 enables the roller sleeve 30 to maintain a good positioning during the operation of the equipment, while protecting the expansion assembly from external pressure or friction, thereby extending the service life of the expansion roller.

[0044] In one embodiment of the present application, a rotating rotor 48 is fixedly connected to the first end of the roller core tube body 10; The rotating rotor 48 is provided with an injection channel 41 corresponding to the injection pipe 22 in a one-to-one manner, and the rotating rotor 48 is provided with a discharge channel 42 corresponding to the discharge pipe 23 in a one-to-one manner; the rotating rotor 48 is provided with an injection annular groove 43 corresponding to and communicating with the injection channel 41 in a one-to-one manner, and the rotating rotor 48 is provided with a discharge annular groove 49 corresponding to and communicating with the discharge channel 42 in a one-to-one manner; The rotating rotor 48 is rotatably connected to the rotating stator 40, and the rotating stator 40 is provided with an injection port 44 corresponding to and communicating with the injection annular groove 43, and the rotating stator 40 is also provided with a discharge port 45 corresponding to and communicating with the discharge annular groove 49. The injection pipe 22 is connected to the injection channel 41 , and the discharge pipe 23 is connected to the discharge channel 42 .

[0045] Specifically, the rotating rotor 48 is fixedly connected to the first end of the roller core tube body 10, and is provided with a plurality of injection channels 41 corresponding to the injection tubes 22 and a discharge channel 42 corresponding to the discharge tubes 23. The outer ends of the injection channels 41 correspond to and are connected to the injection annular grooves 43, and the outer ends of the discharge channels 42 correspond to and are connected to the discharge annular grooves 49. The injection annular grooves 43 and the discharge annular grooves 49 are distributed around the circumference of the rotating rotor 48, and are used for the distribution and collection of the medium, so as to realize the medium transportation in the rotating state.

[0046] The rotating stator 40 is rotatably connected to the outside of the rotating rotor 48, and is provided with an injection port 44 corresponding to and communicating with the injection annular groove 43, and a discharge port 45 corresponding to and communicating with the discharge annular groove 49. The injection port 44 is used to input the medium into the injection annular groove 43, and transport it to the expansion bag 21 through the injection channel 41 and the injection pipe 22; the discharge port 45 is connected to the discharge channel 42 through the discharge annular groove 49, and is used to discharge the medium in the expansion bag 21. The rotating stator 40 and the rotating rotor 48 are sealed by a sealing device to ensure that the medium will not leak under high pressure.

[0047] The medium enters the injection annular groove 43 from the injection port 44 of the rotating stator 40 , enters the injection pipe 22 through the injection channel 41 , and finally enters the expansion bag 21 ; the medium in the expansion bag 21 enters the discharge channel 42 through the discharge pipe 23 , and is then discharged from the discharge port 45 of the rotating stator 40 through the discharge annular groove 49 .

[0048] The rotating stator 40 is fixedly installed, and the rotating rotor 48 rotates with the roller core tube body 10. The injection annular groove 43 and the discharge annular groove 49 can maintain continuous conduction with the injection port 44 and the discharge port 45 in the rotating state. This design ensures stable delivery of the medium, and the expansion or contraction process of the expansion bag 21 can be kept uninterrupted regardless of how the roller core tube body 10 rotates.

[0049] A sealing ring is used to seal between the rotating rotor 48 and the rotating stator 40 to prevent leakage of the medium and ensure stable operation of the system in the rotating state. The sealing ring is made of wear-resistant and high-pressure resistant materials to meet the requirements of long-term high-load work.

[0050] By adopting the above technical solution, dynamic medium control of the expansion bag 21 is achieved through the coordinated design of the rotating rotor 48 and the rotating stator 40, while maintaining the efficient operation of the equipment in a rotating state. The injection channel 41 and the discharge channel 42 arranged inside the rotating rotor 48 cooperate with the annular groove to ensure the uniform distribution and rapid circulation of the medium, so that the expansion bag 21 can adjust the pressing pressure in real time according to the morphology of the battery cell surface. The rotating stator 40 provides a stable injection port 44 and a discharge port 45 to ensure stable pressure and no leakage during the medium transportation process. Through this design, the expansion bag 21 can operate efficiently regardless of the rotation state of the equipment, thereby avoiding the problem of uneven pressure of traditional rubber rollers at high speeds, and significantly improving the quality and efficiency of the battery cell coating.

[0051] In one embodiment of the present application, a sealing rubber ring 46 is provided between the rotating rotor 48 and the rotating stator 40 for dividing each injection annular groove 43 and / or discharge annular groove 49 .

[0052] Specifically, the sealing rubber ring 46 is located between the rotating rotor 48 and the rotating stator 40, and is used to physically isolate the injection annular groove 43 and the discharge annular groove 49 to prevent the medium from leaking through the gap between the grooves or mixing with each other. The sealing rubber ring 46 is usually made of a highly elastic, high temperature resistant, and corrosion resistant material, such as fluororubber (FKM), silicone, or polytetrafluoroethylene (PTFE).

[0053] By adopting the above technical solution, a sealing rubber ring 46 is arranged between the rotating rotor 48 and the rotating stator 40, which can effectively separate the injection annular groove 43 and the discharge annular groove 49 to prevent leakage or cross contamination of the medium between different channels. The sealing rubber ring 46 provides a reliable sealing barrier to ensure the accurate delivery of the medium and improve the working efficiency and safety of the equipment.

[0054] In one embodiment of the present application, a slip ring rotor 61 is connected to one end of the rotating rotor 48 away from the roller core tube body 10, a first through hole is provided on the slip ring rotor 61, a second through hole 47 is provided on the rotating rotor 48, the first through hole is connected to the second through hole 47, a power supply line is connected to the slip ring rotor 61, and the other end of the power supply line passes through the first through hole and the second through hole 47 to be connected to the roller core tube body 10; and The slip ring rotor 61 is rotatably connected to the slip ring stator 60 , and the inner wall of the slip ring stator 60 is provided with a first annular conductive head 62 that can always keep in contact with the power supply line on the slip ring rotor 61 .

[0055] Specifically, the first end of the roller core tube body 10 is fixedly connected to a rotating rotor 48, which is the core component of the medium conveying device, and has an injection channel 41 and an exhaust channel 42 inside. At the same time, the end of the rotating rotor 48 away from the roller core tube body 10 is connected to a slip ring rotor 61 to provide power transmission support for the entire system. The rotating rotor 48 is provided with a second through hole 47, which is used to conduct with the first through hole on the slip ring rotor 61 to achieve the passage and connection of the power supply line.

[0056] The slip ring rotor 61 is fixedly connected to the end of the rotating rotor 48, and a first through hole is arranged inside the slip ring rotor 61, which corresponds to and is connected to the second through hole 47 on the rotating rotor 48. A power supply line is connected to the slip ring rotor 61, one end of which is fixed to the slip ring rotor 61, and the other end of which extends to the roller core tube body 10 through the first through hole and the second through hole 47, so as to provide power support for the roller core tube body 10 and its internal equipment. The design of the slip ring rotor 61 ensures that the power supply line can stably transmit electric energy and realize continuous operation of the equipment.

[0057] The slip ring stator 60 is rotatably connected to the outside of the slip ring rotor 61 and is fixedly mounted on the fixed bracket 50 of the device. A first annular conductive head 62 is provided on the inner wall of the slip ring stator 60 to contact the power supply line on the slip ring rotor 61. The conductive head is made of a material with high conductivity and low friction, such as a silver-plated or gold-plated copper alloy. The first annular conductive head 62 of the slip ring stator 60 always keeps in contact with the power supply line when the slip ring rotor 61 rotates, thereby realizing power transmission of the device.

[0058] One end of the power supply line is connected to the slip ring rotor 61, and the other end extends to the electrical device or electric control system inside the roller core tube body 10 through the first through hole and the second through hole 47, ensuring that the equipment can continuously obtain power supply when rotating. The annular conductive head of the slip ring stator 60 ensures the continuity and stability of power transmission when the slip ring rotor 61 rotates by sliding contact.

[0059] By adopting the above technical solution, the separation of the power transmission and rotation functions of the expansion roller equipment is achieved through the structural design of the slip ring rotor 61 and the slip ring stator 60. The slip ring rotor 61 is connected to the rotating rotor 48, and provides continuous and stable power support for the equipment through the sliding contact between the power supply line and the annular conductive head of the slip ring stator 60. Regardless of the speed at which the equipment runs, the slip ring assembly can ensure the reliability of power supply, thereby ensuring the normal operation of the expansion roller. The design of the slip ring structure avoids the problem of line distortion or breakage caused by rotation in traditional power transmission methods, and improves the safety and stability of equipment operation.

[0060] In one embodiment of the present application, a second annular conductive head 63 slidably connected to the first annular conductive head 62 is provided on the outer wall of the slip ring rotor 61 , and a power supply line on the slip ring rotor 61 is connected to the second annular conductive head 63 .

[0061] Specifically, the slip ring rotor 61 is fixedly connected to the end of the rotating rotor 48, and a second annular conductive head 63 is provided on the outer side wall thereof, and the second annular conductive head 63 is in sliding contact with the first annular conductive head 62 on the slip ring stator 60. The power supply line on the slip ring rotor 61 is connected to the second annular conductive head 63, and is used to transfer power from the slip ring stator 60 to the slip ring rotor 61, and transmit the power to the electric control system of the roller core tube body 10 through the first through hole and the second through hole 47.

[0062] The slip ring rotor 61 can rotate relative to the slip ring stator 60, and the slip ring stator 60 is fixedly mounted on the fixed bracket 50 of the equipment. The inner wall of the slip ring stator 60 is provided with a first annular conductive head 62, and the first annular conductive head 62 maintains sliding contact with the second annular conductive head 63 on the outer wall of the slip ring rotor 61. The first annular conductive head 62 is made of a highly conductive material, such as a gold-plated copper alloy, to ensure low impedance and high stability during sliding contact.

[0063] By adopting the above technical solution, the high efficiency and stability of the power transmission of the equipment are achieved through the sliding connection design of the second annular conductive head 63 on the outer wall of the slip ring rotor 61 and the first annular conductive head 62 on the inner wall of the slip ring stator 60. The setting of the second annular conductive head 63 enables the slip ring rotor 61 to always maintain the electrical connection of the power supply line in the rotating state, ensuring that the electronic control system of the expansion roller equipment works normally during the rotation process.

[0064] In one embodiment of the present application, an insulating sleeve 70 is provided between the second annular conductive head 63 and the slip ring rotor 61 .

[0065] Specifically, the insulating sleeve 70 is disposed between the second annular conductive head 63 and the slip ring rotor 61 to isolate the conductive head from the metal body of the rotor. The insulating sleeve 70 is made of high-strength insulating material, such as polytetrafluoroethylene or alumina ceramic, and has excellent electrical insulation and high temperature resistance, and can ensure the electrical safety of the equipment under high-voltage and high-temperature working conditions.

[0066] By adopting the above technical solution, by providing an insulating sleeve 70 between the second annular conductive head 63 and the slip ring rotor 61, complete electrical isolation between the conductive head and the rotor body is achieved, effectively improving the electrical safety of the equipment.

[0067] In an embodiment of the present application, the expansion bag 21 is made of nylon material.

[0068] By adopting the above technical solution, the nylon material has high tensile strength and tearing strength, and can maintain good shape and structural stability even under high pressure, so that the expansion bag 21 can withstand high internal pressure and external stress during expansion and contraction, and avoids the expansion bag 21 from rupture or deformation due to excessive pressure.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An expansion roller device for lithium battery coating, characterized in that: include: Roller core tube body; and At least one expansion component is arranged on the roller core tube body and can expand or contract to adjust the pressing pressure on the surface of the battery core.

2. The expansion roller device for lithium battery coating according to claim 1, characterized in that: The expansion assembly comprises: An expansion bag, covering the roller core tube body; an injection pipe, wherein the roller core tube body is provided with a first through hole for the injection pipe to pass through, a first end of the injection pipe enters the roller core tube body from the first end of the roller core tube body and extends from the first through hole to communicate with the expansion bag, so as to inject a medium into the expansion bag; and A discharge pipe, wherein the roller core tube body is provided with a second through hole for the injection tube to pass through, and the first end of the discharge pipe enters the roller core tube body from the first end of the roller core tube body and extends from the second through hole to communicate with the expansion bag, so as to discharge the medium in the expansion bag.

3. The expansion roller device for lithium battery coating according to claim 1, characterized in that: The expansion assembly is covered with a roller sleeve.

4. The expansion roller device for lithium battery coating according to claim 3, characterized in that: The first end of the roller sleeve abuts against the shoulder of the roller core tube body, a blocking ring is provided on the end of the roller core tube body away from the shoulder, and the second end of the roller sleeve abuts against the blocking ring.

5. The expansion roller device for lithium battery coating according to claim 2, characterized in that: The first end of the roller core tube body is fixedly connected to a rotating rotor; The rotating rotor is provided with an injection channel corresponding to the injection pipe one by one, and the rotating rotor is provided with a discharge channel corresponding to the discharge pipe one by one; the rotating rotor is provided with an injection annular groove corresponding to and connected to the injection channel one by one, and the rotating rotor is provided with a discharge annular groove corresponding to and connected to the discharge channel one by one; The rotating rotor is rotatably connected to a rotating stator, the rotating stator is provided with an injection port corresponding to and connected to the injection annular groove, and the rotating stator is also provided with a discharge port corresponding to and connected to the discharge annular groove; The injection pipe is connected to the injection channel, and the discharge pipe is connected to the discharge channel.

6. The expansion roller device for lithium battery coating according to claim 5, characterized in that: A sealing rubber ring is provided between the rotating rotor and the rotating stator for dividing each injection annular groove and / or discharge annular groove.

7. The expansion roller device for lithium battery coating according to claim 5, characterized in that: The end of the rotating rotor away from the roller core tube body is connected to a slip ring rotor, the slip ring rotor is provided with a first through hole, the rotating rotor is provided with a second through hole, the first through hole is connected to the second through hole, the slip ring rotor is connected to a power supply line, the other end of the power supply line passes through the first through hole and the second through hole and is connected to the roller core tube body; and The slip ring rotor is rotatably connected with a slip ring stator, and the inner wall of the slip ring stator is provided with a first annular conductive head which can always keep in contact with the power supply line on the slip ring rotor.

8. The expansion roller device for lithium battery coating according to claim 7, characterized in that: A second annular conductive head which can be slidably connected to the first annular conductive head is provided on the outer side wall of the slip ring rotor, and a power supply line on the slip ring rotor is connected to the second annular conductive head.

9. The expansion roller device for lithium battery coating according to claim 8, characterized in that: An insulating sleeve is provided between the second annular conductive head and the slip ring rotor.

10. The expansion roller device for lithium battery coating according to claim 2, characterized in that: The expansion bag is made of nylon material.

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