A high-speed extrusion coating device for lithium battery pole pieces with low surface density

Abstract

The application relates to a coating equipment and belongs to the technical field of lithium battery pole piece production, in particular to a high-speed extrusion type coating equipment for low-surface-density lithium battery pole pieces, which comprises a base, a current collector arranged on the top of the base, a tensioning assembly arranged on the top of the base, a fixing support, a guide roller, an inner support, a mounting shaft, a tensioning rod, a guide groove, a tensioning roller, a rotating rod and an extension spring; the current collector is pulled straight by the tensioning roller through the elasticity of the two extension springs, the tensioning roller and the rotating rod move upwards along with the extension of the extension spring, the current collector is loosened along with movement, the tensioning roller moves along the inside of the guide groove, the tensioning rod and the guide roller share a common center, the tensioning roller can also move the current collector around the guide roller, the contact area of the current collector and the guide roller is increased, and the current collector is conveniently pulled straight; the problem that the current collector is wrinkled when passing through the compression roller due to untimely tensioning adjustment is solved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrode production technology, and in particular to a high-speed extrusion coating equipment for low areal density lithium battery electrodes. Background Technology

[0002] Lithium-ion batteries are a type of rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. During charging and discharging, lithium ions repeatedly insert and extract between the two electrodes: during charging, lithium ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging. The manufacturing of lithium-ion batteries is a process comprised of a series of tightly linked technological steps. Overall, lithium battery production includes electrode manufacturing, battery assembly, and the final processes of electrolyte injection, pre-charging, formation, and aging. Each of these three stages can be further divided into several key processes, each of which significantly impacts the final performance of the battery. The electrode manufacturing process is the core of the entire lithium battery manufacturing process, directly affecting the battery's electrochemical performance, and the quality of the slurry is particularly crucial.

[0003] Chinese Patent CN113828478B discloses a high-speed extrusion coating device for low-area-density lithium battery electrodes. The device includes a frame, with a motor mounted externally. An output shaft is fixedly connected to the motor's output end, and a coating roller is fixedly fitted to the outer wall of the output shaft. A baffle is fitted to the outer wall of the coating roller. A scraper device is fixedly mounted on the left side of the frame. A flexible rubber roller is arranged on the feeding side of the scraper device, with a material-holding groove on its surface. The roller body of the flexible rubber roller abuts against the electrode sheet attached to the coating roller, and the side of the flexible rubber roller away from the coating roller abuts against the bottom of the frame. This invention achieves low-area-density coating by using a flexible rubber roller on the feeding side of the scraper device. This flexible rubber roller can transfer the slurry already coated on the electrode sheet, and then the scraper device performs scraping treatment, thus realizing a low-area-density coating function. Therefore, it is suitable for coating requirements of power-type lithium battery electrodes.

[0004] In the aforementioned prior art solution, a flexible rubber roller is set on the feeding side of the scraper device. This flexible rubber roller can transfer the slurry portion that has been sprayed on the electrode sheet. After scraping by the scraper device, a low surface density coating function is achieved. Therefore, it is suitable for the coating requirements of power lithium battery electrodes. However, if the tension adjustment is not timely, wrinkles will appear when the current collector passes through the pressure roller, which will affect the uniformity of the coating. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this invention proposes a high-speed extrusion coating device for low areal density lithium battery electrodes. When the current collector loosens as it moves, the tension roller moves along the inside of the guide groove. Since the tension rod and the guide roller are concentric, the tension roller can also move the current collector around the guide roller, increasing the contact area between the current collector and the guide roller, and making it easier to straighten the current collector.

[0006] The technical solution to achieve the purpose of this invention is as follows: a high-speed extrusion coating device for low areal density lithium battery electrode sheets, comprising a base, a current collector at the top of the base, and a tensioning assembly at the top of the base. The tensioning assembly includes two fixed brackets fixedly installed on the top wall of the base, a guide roller between the two fixed brackets, the guide roller being hollow cylindrical, an inner bracket fixedly installed on the inner side wall of the guide roller, two mounting shafts fixedly installed on the side wall of the inner bracket, the two mounting shafts being rotatably installed on the side wall of the two fixed brackets respectively, tensioning rods fixedly installed on the side wall of each of the two fixed brackets, the tensioning rods being arc-shaped with the mounting shafts as the center, guide grooves being provided on the side wall of each of the two tensioning rods, a tensioning roller between the two tensioning rods, rotating rods being rotatably installed on the two side walls of the tensioning roller near the two tensioning rods, and extension springs being provided at the bottom of the inner ends of the two guide grooves.

[0007] In some embodiments, a transmission assembly is provided on the top of the base. The transmission assembly includes two fixed brackets fixedly installed on the top wall of the base. A feeding roll is rotatably installed on the side wall of the two fixed brackets that are close to each other. A drying device is fixedly installed on the top wall of the base away from the fixed brackets. A thickness measuring device is fixedly installed on the top wall of the base. Mounting plates are fixedly installed at both the upper and lower ends of the side wall of the thickness measuring device that is away from the drying device. A spraying device is fixedly installed on the side wall of the two mounting plates that are close to each other.

[0008] In some embodiments, two mounting brackets are fixedly installed on the top wall of the base, and a first extrusion roller is rotatably installed on the side wall of the two mounting brackets that are close to each other. Mounting blocks are fixedly installed on the side wall of the two mounting brackets that are away from the drying device, and a second extrusion roller is rotatably installed on the side wall of the two mounting blocks that are close to each other.

[0009] In some embodiments, the top of the base is provided with an expansion assembly, which includes multiple expansion grooves formed on the left and right sides of the sidewall of the guide roller. Each expansion groove has a compression pad slidably installed inside it. A compression rod is fixedly installed on one end of the compression pad near the mounting shaft. The guide roller has two guide blocks inside it that are respectively aligned with the adjacent compression rods.

[0010] In some embodiments, the expansion grooves on the left and right sides are mirror-distributed, the interior of the expansion grooves is inclined to expand outwards, and the sidewalls of the guide block are arc-shaped.

[0011] In some embodiments, fixed shafts are fixedly installed on the side walls of the two fixed brackets that are far apart from each other. Movable bearings are fixedly installed on the outer walls of the two fixed shafts. Linkage rods are fixedly installed on the outer walls of the two movable bearings. Two guide blocks are fixedly installed on the side walls of the two linkage rods respectively. Linkage grooves are opened on the inner walls of the two tension rods. A positioning rod is fixedly installed on the end of the linkage rod near the tension rod.

[0012] In some embodiments, both fixed shafts are aligned with the mounting shaft, the linkage groove and the guide groove are internally connected, and the positioning rod is engaged inside the rotating rod.

[0013] In some embodiments, guide plates are fixedly connected to the top ends of both extension springs, and the two guide plates are respectively in contact with the side walls of the two rotating rods.

[0014] In some embodiments, a limit rod is fixedly installed on the side wall of the compression rod.

[0015] The significant advantages of this invention compared to existing technologies are:

[0016] Firstly, this invention inserts the current collector into the gap between the guide roller and the tension roller along the bottom end of the guide roller, and then inserts it between the rotating rod and the guide plate. By utilizing the elasticity of two extension springs, the tops of the two extension springs extend upward inside the guide groove. The tension roller and the rotating rod move upward as the extension springs extend, causing the tension roller to straighten the current collector. When the current collector loosens as it moves, the tension roller moves along the inside of the guide groove. Since the tension rod and the guide roller are concentric, the tension roller can also move the current collector around the guide roller, increasing the contact area between the current collector and the guide roller, making it easier to straighten the current collector. This solves the problem of wrinkles appearing when the current collector passes through the pressure roller due to untimely tension adjustment in existing methods.

[0017] Secondly, in this invention, the guide roller rotates as the current collector is conveyed, causing the side wall of the extrusion rod to fit against the side wall of the guide block. When the extrusion pad is aligned with the side wall of the tension roller, the guide block extrudes the extrusion rod, causing the extrusion rod to push the extrusion pad to extend outward and contact the side wall of the current collector. The expansion groove is inclined to expand outward, so the extrusion pad will push the current collector to expand to both sides, avoiding the current collector from folding and wrinkling.

[0018] Thirdly, in this invention, the linkage rod and the rotating rod are connected together by a positioning rod. When the rotating rod moves with the change of the current collector, the linkage rod will rotate synchronously with the rotating rod, ensuring that the extrusion pad extends outward while aligned with the tension roller. Because the fixed shaft is aligned with the mounting shaft, the rotation center of the linkage rod and the center of the tension rod are the same as the center of the guide roller. Therefore, the guide block does not undergo eccentric displacement, avoiding the situation where the guide block cannot contact the extrusion rod.

[0019] Fourthly, in this invention, when the extrusion rod and the guide block are misaligned, the extrusion pad returns to its original shape due to its own elasticity, and the inner wall of the expansion groove is inclined, so that the extrusion pad is stuck inside the expansion groove, and therefore the extrusion pad will not fall out of the expansion groove.

[0020] Fifthly, this invention limits the range of motion of the extrusion rod by using a limiting rod to prevent the extrusion pad from extending too far outward when the extrusion rod is squeezed by the guide block, which could cause the extrusion pad to detach from the inside of the expansion groove. The guide plate increases the contact area between the extension spring and the rotating rod, enabling the extension spring to push the rotating rod to move more stably and preventing the rotating rod from deviating. Attached Figure Description

[0021] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a front view of the high-speed extrusion coating equipment for lithium battery electrodes of the present invention;

[0023] Figure 2 This is a rear view of the high-speed extrusion coating equipment for lithium battery electrodes of the present invention;

[0024] Figure 3 This is the main view of the tensioning component of the present invention;

[0025] Figure 4 This is a rear view of the guide roller of the present invention;

[0026] Figure 5 This is a front view of the tension roller of the present invention;

[0027] Figure 6 This is a cross-sectional view of the guide roller of the present invention;

[0028] Figure 7 This is a front view of the tensioning rod of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Base; 2. Transmission assembly; 21. Fixing frame; 22. Feed roll; 23. Drying device; 24. Thickness measuring device; 25. Mounting plate; 26. Spraying device; 27. Mounting bracket; 28. Extrusion roller one; 29. ​​Mounting block; 291. Extrusion roller two; 3. Current collector; 4. Tensioning assembly; 41. Fixing bracket; 42. Guide roller; 43. Inner bracket; 44. Mounting shaft; 45. Tensioning rod; 46. Guide groove; 47. Tensioning roller; 48. Rotating rod; 49. Extension spring; 491. Guide plate; 5. Expansion assembly; 51. Expansion groove; 52. Extrusion pad; 53. Extrusion rod; 54. Limiting rod; 55. Fixing shaft; 56. Movable bearing; 57. Linkage rod; 58. Guide block; 59. Linkage groove; 591. Positioning rod. Detailed Implementation

[0031] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides an improved high-speed extrusion coating apparatus for low areal density lithium battery electrodes. The technical solution of this invention is as follows:

[0033] like Figure 1 - Figure 2 As shown, a high-speed extrusion coating device for low-area-density lithium battery electrodes includes a base 1, a current collector 3 on the top of the base 1, and a transmission assembly 2 for driving the current collector 3. The transmission assembly 2 includes two fixed brackets 21 fixedly mounted on the top wall of the base 1. A feeding roll 22 is rotatably mounted on the side wall of the two fixed brackets 21 that is close to each other. A drying device 23 is fixedly mounted on the top wall of the base 1 away from the fixed brackets 21. A thickness measuring device 24 is fixedly mounted on the top wall of the base 1. Mounting plates 25 are fixedly mounted on both the upper and lower ends of the side wall of the thickness measuring device 24 away from the drying device 23. Spraying devices 26 are fixedly mounted on the side wall of the two mounting plates 25 that are close to each other. Two mounting brackets 27 are fixedly mounted on the top wall of the base 1. An extrusion roller 28 is rotatably mounted on the side wall of the two mounting brackets 27 that is close to each other. A spraying device 26 is fixedly mounted on the side wall of the two mounting brackets 27 away from the drying device 23. Mounting blocks 29 are fixedly installed on one side of the collector 3. Extrusion rollers 291 are rotatably installed on the side of the two adjacent mounting blocks 29. The end of the collector 3 away from the unloading roll 22 is inserted between the extrusion rollers 28 and 291, then passes through the gap between the two spraying devices 26, then through the hole on the thickness measuring device 24, and finally enters the interior of the drying device 23. The extrusion rollers 28 and 291 straighten the collector 3 to ensure that the collector 3 is in a flat state. Then, the two spraying devices 26 spray the upper and lower side walls of the collector 3, spraying the material onto the upper and lower side walls of the collector 3. The thickness measuring device 24 measures the amount of material sprayed by the spraying device 26. If it meets the standard, no reaction is made. If it does not meet the standard, an error is reported. After the test is completed, the material on the surface of the collector 3 is dried by the drying device 23 for easy storage.

[0034] like Figure 1 - Figure 7As shown, in one embodiment, to prevent the current collector 3 from becoming loose, a tensioning assembly 4 is provided on the top of the base 1. The tensioning assembly 4 includes two fixed brackets 41 fixedly installed on the top wall of the base 1. A guide roller 42 is provided between the two fixed brackets 41. The guide roller 42 is hollow cylindrical. An inner bracket 43 is fixedly installed on the inner side wall of the guide roller 42. Two mounting shafts 44 are fixedly installed on the side wall of the inner bracket 43. The two mounting shafts 44 are rotatably installed on the side wall of the two fixed brackets 41 that are close to each other. On the surface, tension rods 45 are fixedly installed on the side wall of each of the two fixed brackets 41 near the mounting bracket 27. The tension rods 45 are arc-shaped with the mounting shaft 44 as the center. Guide grooves 46 are opened on the side wall of each of the two tension rods 45. A tension roller 47 is arranged between the two tension rods 45. Rotating rods 48 are rotatably installed on the two side walls of the tension roller 47 near the two tension rods 45. Extension springs 49 are provided at the bottom of the two guide grooves 46. The current collector 3 is inserted along the bottom end of the guide roller 42. The guide roller 45 is inserted between the guide roller 42 and the tension roller 47, and then between the rotating rod 48 and the guide plate 491. Utilizing the elasticity of the two extension springs 49, the tops of the two extension springs 49 extend upwards inside the guide groove 46. The tension roller 47 and the rotating rod 48 move upwards as the extension springs 49 extend, causing the tension roller 47 to straighten the collector 3. When the collector 3 loosens with movement, the tension roller 47 moves along the inside of the guide groove 46. The tension rod 45 and the guide roller 42 are concentric. Therefore, the tension roller 47 can also move the current collector 3 around the guide roller 42, increasing the contact area between the current collector 3 and the guide roller 42, making it easier to straighten the current collector 3. The top ends of the two extension springs 49 are fixedly connected to guide plates 491, and the two guide plates 491 are respectively in contact with the side walls of the two rotating rods 48. By increasing the contact area between the extension springs 49 and the rotating rods 48 through the guide plates 491, the extension springs 49 can push the rotating rods 48 to move more stably, avoiding the occurrence of the rotating rods 48 deviating.

[0035] like Figure 1 - Figure 7As shown, in one embodiment, to prevent the current collector 3 from folding towards the center during transport, an expansion assembly 5 is provided on the top of the base 1. The expansion assembly 5 includes multiple expansion grooves 51 formed on the left and right sides of the sidewall of the guide roller 42. The expansion grooves 51 on the left and right sides are mirror-distributed. The interior of the expansion grooves 51 is inclined and expands outward. A compression pad 52 is slidably installed inside each of the multiple expansion grooves 51. The compression pad 52 is made of rubber. A compression rod 53 is fixedly installed on one end of the compression pad 52 near the mounting shaft 44. The guide roller 42 has two guide blocks 58 that are respectively aligned with the adjacent compression rods 53. The sidewall of the guide block 58 is arc-shaped. The guide roller 42 follows... The extrusion rod 53 rotates as it is conveyed by the current collector 3, causing the side wall of the extrusion rod 53 to fit against the side wall of the guide block 58. When the extrusion pad 52 is aligned with the side wall of the tension roller 47, the guide block 58 extrudes the extrusion rod 53, causing the extrusion rod 53 to push the extrusion pad 52 outward to contact the side wall of the current collector 3. The expansion groove 51 is inclined to expand outward, so the extrusion pad 52 will push the current collector 3 to expand to both sides, preventing the current collector 3 from folding and wrinkling. When the extrusion rod 53 and the guide block 58 are misaligned, the extrusion pad 52 returns to its original shape due to its own elasticity, and the inner side wall of the expansion groove 51 is inclined, causing the extrusion pad 52 to be stuck inside the expansion groove 51. Therefore, the extrusion pad 52 will not fall out of the expansion groove 51.

[0036] like Figure 1 - Figure 7As shown, in one embodiment, to prevent the tension roller 47 from moving with the loosening of the collector 3, causing the compression pad 52 to contact the collector 3 prematurely and thus loosening the collector 3, a fixed shaft 55 is fixedly installed on the side wall of each of the two fixed supports 41 that are far apart. Both fixed shafts 55 are aligned with the mounting shaft 44. Movable bearings 56 are fixedly installed on the outer walls of both fixed shafts 55. Linkage rods 57 are fixedly installed on the outer walls of both movable bearings 56. Two guide blocks 58 are respectively fixedly installed on the side walls of the two linkage rods 57. Linkage grooves 59 are provided on the inner walls of both tension rods 45, communicating with the interior of the guide grooves 46. A positioning rod 591 is fixedly installed on one end of the linkage rod 57 near the tension rod 45, and the positioning rod 591 is engaged inside the rotating rod 48. Positioning rod 591 connects linkage rod 57 and rotating rod 48. When rotating rod 48 moves with the change of current collector 3, linkage rod 57 rotates synchronously with rotating rod 48, ensuring that extrusion pad 52 extends outward while aligned with tension roller 47. Because fixed shaft 55 is aligned with mounting shaft 44, the rotation center of linkage rod 57 is the same as the center of tension rod 45 and guide roller 42. Therefore, guide block 58 does not undergo eccentric displacement, avoiding the situation where guide block 58 cannot contact extrusion rod 53. Limiting rod 54 is fixedly installed on the side wall of extrusion rod 53. Limiting rod 54 restricts the range of motion of extrusion rod 53, preventing extrusion pad 52 from extending outward too much when extrusion rod 53 is squeezed by guide block 58, which could cause extrusion pad 52 to detach from the inside of expansion groove 51.

[0037] The specific working method is as follows: Insert the end of the collector 3 furthest from the unloading roll 22 between the first extrusion roller 28 and the second extrusion roller 291, then pass through the gap between the two spraying devices 26, then through the orifice on the thickness measuring device 24, and finally into the interior of the drying device 23. The first extrusion roller 28 and the second extrusion roller 291 straighten the collector 3, ensuring it is in a flat state. Then, the two spraying devices 26 spray the upper and lower side walls of the collector 3, applying the material to these surfaces. The thickness measuring device 24 measures the amount of material sprayed by the spraying devices 26. If the measurement meets the standard, no action is taken; if it does not meet the standard, an error is reported, and the process is checked. After the test is completed, the material on the surface of the collector 3 is dried by the drying device 23 for easy storage. The collector 3 is inserted into the gap between the guide roller 42 and the tension roller 47 along the bottom end of the guide roller 42, and then inserted between the rotating rod 48 and the guide plate 491. By utilizing the elasticity of the two extension springs 49, the tops of the two extension springs 49 extend upward inside the guide groove 46. The tension roller 47 and the rotating rod 48 move upward as the extension springs 49 extend, so that the tension roller 47 straightens the collector 3. When the collector 3 loosens as it moves, the tension roller 47 will move along the inside of the guide groove 46. Since the tension rod 45 and the guide roller 42 are concentric, the tension is achieved. Roller 47 can also move the collector 3 around guide roller 42, increasing the contact area between the collector 3 and guide roller 42, making it easier to straighten the collector 3. Guide roller 42 rotates as the collector 3 is conveyed, causing the side wall of extrusion rod 53 to fit against the side wall of guide block 58. When extrusion pad 52 is aligned with the side wall of tension roller 47, guide block 58 extrudes extrusion rod 53, causing extrusion rod 53 to push extrusion pad 52 outward to contact the side wall of collector 3. Since expansion groove 51 is inclined to expand outward, extrusion pad 52 will push collector 3 to expand to both sides, preventing collector 3 from folding and wrinkling. When extrusion rod 53 and guide block 58 are misaligned, extrusion pad 52 recovers its elasticity. The original state is maintained, and the inner wall of the expansion groove 51 is inclined, so that the extrusion pad 52 is stuck inside the expansion groove 51. Therefore, the extrusion pad 52 will not fall out of the expansion groove 51. The linkage rod 57 is connected to the rotating rod 48 by the positioning rod 591. When the rotating rod 48 moves with the change of the current collector 3, the linkage rod 57 will rotate synchronously with the rotating rod 48, ensuring that the extrusion pad 52 extends outward while aligned with the tension roller 47. Because the fixed shaft 55 is aligned with the mounting shaft 44, the rotation center of the linkage rod 57 and the center of the tension rod 45 and the guide roller 42 are the same. Therefore, the guide block 58 does not have an eccentric displacement, avoiding the situation where the guide block 58 cannot contact the extrusion rod 53.

[0038] The technical means disclosed in this invention are not limited to those described above, but also include technical solutions composed of equivalent substitutions of the above technical features. Matters not covered in this invention are common knowledge to those skilled in the art.

Claims

1. A high-speed extrusion coating device for low areal density lithium battery electrodes, comprising a base (1), wherein a current collector (3) is disposed on the top of the base (1), characterized in that: The base (1) is provided with a tensioning assembly (4) at its top. The tensioning assembly (4) includes two fixed brackets (41) fixedly installed on the top wall of the base (1). A guide roller (42) is provided between the two fixed brackets (41). The guide roller (42) is hollow cylindrical. An inner bracket (43) is fixedly installed on the inner side wall of the guide roller (42). Two mounting shafts (44) are fixedly installed on the side wall of the inner bracket (43). The two mounting shafts (44) are rotatably installed on the side wall of the two fixed brackets (41) respectively. Tensioning components are fixedly installed on the side wall of both fixed brackets (41). The tension rod (45) is an arc shape with the mounting shaft (44) as the center. Guide grooves (46) are provided on the side wall of the two tension rods (45) that are close to each other. A tension roller (47) is provided between the two tension rods (45). Rotating rods (48) are rotatably installed on the two side walls of the tension roller (47) near the two tension rods (45). Extension springs (49) are provided at the bottom of the two guide grooves (46). An expansion assembly (5) is provided on the top of the base (1). The expansion assembly (5) includes multiple expansion grooves (5) opened on the left and right sides of the side wall of the guide roller (42). 1) Each of the multiple expansion grooves (51) has a slidably mounted extrusion pad (52) inside. An extrusion rod (53) is fixedly mounted on one end of the extrusion pad (52) near the mounting shaft (44). The guide roller (42) has two guide blocks (58) inside, each aligned with the adjacent extrusion rod (53). The expansion grooves (51) on the left and right sides are mirror images of each other. The interior of the expansion grooves (51) is inclined and expands outward. The sidewalls of the guide blocks (58) are arc-shaped. Fixed shafts (55) are fixedly mounted on the sidewalls of the two fixed supports (41) that are far apart. Movable bearings (56) are fixedly installed on the outer side walls. Linkage rods (57) are fixedly installed on the outer side walls of the two movable bearings (56). Two guide blocks (58) are fixedly installed on the side walls of the two linkage rods (57). Linkage grooves (59) are opened on the inner side walls of the two tension rods (45). A positioning rod (591) is fixedly installed on one end of the linkage rod (57) near the tension rod (45). The two fixed shafts (55) are aligned with the mounting shaft (44). The linkage groove (59) is connected to the inside of the guide groove (46). The positioning rod (591) is stuck inside the rotating rod (48).

2. The high-speed extrusion coating equipment for low areal density lithium battery electrodes according to claim 1, characterized in that: The top of the base (1) is provided with a transmission assembly (2), which includes two fixed frames (21) fixedly installed on the top wall of the base (1). A feeding roll (22) is rotatably installed on the side wall of the two fixed frames (21) that are close to each other. A drying device (23) is fixedly installed on the top wall of the base (1) away from the fixed frame (21). A thickness measuring device (24) is fixedly installed on the top wall of the base (1). Mounting plates (25) are fixedly installed at both ends on the side wall of the thickness measuring device (24) away from the drying device (23). A spraying device (26) is fixedly installed on the side wall of the two mounting plates (25) that are close to each other.

3. The high-speed extrusion coating equipment for low areal density lithium battery electrodes according to claim 2, characterized in that: Two mounting brackets (27) are fixedly installed on the top wall of the base (1). A first extrusion roller (28) is rotatably installed on the side wall of the two mounting brackets (27) that are close to each other. Mounting blocks (29) are fixedly installed on the side wall of the two mounting brackets (27) that are far away from the drying device (23). A second extrusion roller (291) is rotatably installed on the side wall of the two mounting blocks (29) that are close to each other.

4. The high-speed extrusion coating equipment for low areal density lithium battery electrodes according to claim 1, characterized in that: The top ends of the two extension springs (49) are fixedly connected to guide plates (491), and the two guide plates (491) are respectively in contact with the side walls of the two rotating rods (48).

5. The high-speed extrusion coating equipment for low areal density lithium battery electrodes according to claim 4, characterized in that: A limit rod (54) is fixedly installed on the side wall of the extrusion rod (53).

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