A battery pole piece coating device

Abstract

This invention relates to the field of battery technology, and more particularly to a battery electrode coating apparatus, comprising a frame, a feeding roller and a horizontal correction device at the lower part of the frame, and a first heating roller, a first extrusion coating device, a heater, a second heating roller, and a second extrusion coating device at the upper part of the frame. In this invention, a current collector, after being corrected by the horizontal correction device, is wound around the first heating roller. The first extrusion coating device coats a first electrode slurry onto the current collector to form a first electrode layer. After the current collector is heated by the heater, the surface of the first electrode layer dries and its surface tension increases. The second extrusion coating device coats a second electrode slurry onto the first electrode layer to form a second electrode layer. The first and second electrode layers are bonded together to form a double-layer electrode, making it less prone to mixing and resulting in a more stable double-layer electrode structure.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery electrode coating apparatus. Background Technology

[0002] Slurry coating is the next step after slurry preparation. Its main purpose is to uniformly coat the positive and negative electrode current collectors with a slurry that has good stability, viscosity, and flowability. Electrode coating is crucial for the capacity, consistency, and safety of lithium-ion batteries.

[0003] Improving the microstructure of multilayer electrodes in lithium-ion batteries can enhance battery performance. For example, by finely designing the electrode layers, "high-speed channels for ions and electrons" can be constructed, reducing lithium-ion diffusion resistance and slowing capacity decay. Another example is controlling the gradient distribution of the porous structure of the electrode to achieve a high-porosity upper layer and a high-density lower layer, combining the advantages of high energy density and super-fast charging. To improve the production efficiency of such fine structures, multilayer co-coating mainly uses two different slurries to improve electrode performance. However, existing multilayer co-coating technologies are prone to problems such as the mixing of upper and lower slurries, leading to coating instability. Therefore, improvements are necessary. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing multilayer co-coating technologies, which are prone to instability due to the mixing of upper and lower slurries. This invention provides a battery electrode coating apparatus. A current collector is placed on a feeding roller, which then winds around a horizontal correction device. After being corrected by the horizontal correction device, the current collector winds around a first heating roller. A first extrusion coating device is positioned on one side of the first heating roller and coats the first electrode slurry onto the current collector to form a first electrode layer. The current collector is heated by a heater, causing the surface of the first electrode layer to dry and increasing its surface tension, facilitating subsequent coating operations. The current collector is then wound around a second heating roller. A second extrusion coating device is positioned at the end of the second heating roller near the heater and coats the second electrode slurry onto the first electrode layer to form a second electrode layer. The first and second electrode layers are bonded together to form a double-layer electrode, making it less prone to mixing and resulting in a more stable double-layer electrode structure.

[0005] To achieve the above objectives, the present invention provides a battery electrode coating apparatus, comprising a frame, wherein a feeding roller and a horizontal correction device are provided at the lower part of the frame, and a first heating roller, a first extrusion coating device, a heater, a second heating roller and a second extrusion coating device are provided at the upper part of the frame, wherein the first extrusion coating device and the second extrusion coating device are used to extrude a first electrode slurry and a second electrode slurry, respectively.

[0006] The current collector is placed on the feeding roller, and the current collector is wound around the horizontal correction device from the feeding roller. After being corrected by the horizontal correction device, the current collector is wound around the first heating roller. The first extrusion coating device is set on one side of the first heating roller and coats the first electrode slurry onto the current collector to form the first electrode layer. After the current collector is heated by the heater, the surface of the first electrode layer is dried. The current collector is wound around the second heating roller. The second extrusion coating device is set at the end of the second heating roller near the heater and coats the second electrode slurry onto the first electrode layer to form the second electrode layer. The first electrode layer and the second electrode layer are bonded together to form a double-layer electrode.

[0007] Preferably, the horizontal correction device includes a support, a correction platform, and a correction roller. The correction platform is rotatably mounted on the support, and the correction roller is rotatably mounted on the end of the correction platform facing the feeding roller. A correction driver is provided between the support and the correction platform, and the two ends of the correction driver are respectively hinged to the support and the correction platform.

[0008] The support is equipped with a slide rail, and the correction platform is equipped with pulleys. The correction platform is connected to the slide rail of the support through the pulleys. The correction driver drives the correction platform and the support to rotate, so that the correction platform and the support remain horizontal.

[0009] Preferably, a tension adjuster is provided between the horizontal correction device and the first heating roller. The tension adjuster includes an adjustment limiter, an adjustment frame, a telescopic adjuster, and a tension roller. The adjustment limiter is fixed to the frame and is provided with an eccentric wheel. The adjustment frame is provided with an adjustment limit groove. The tension roller is rotatably disposed at one end of the adjustment frame near the first heating roller. The telescopic adjuster is fixed to the frame and drives the adjustment frame to move closer to or away from the first heating roller, so that the adjustment limit groove of the adjustment frame slides along the eccentric wheel, and the adjustment limit groove abuts against the eccentric wheel, thus restricting the adjustment of the adjustment frame.

[0010] Preferably, both the first extrusion coating device and the second extrusion coating device include an upper die head and a lower die head, with an extrusion gap between the upper die head and the lower die head. An extrusion port is provided at one end of the extrusion gap, and a first storage cavity, a second storage cavity, and a third storage cavity are sequentially arranged in the direction of the extrusion port inside the lower die head. The first storage cavity, the second storage cavity, and the third storage cavity are all connected to the extrusion gap.

[0011] The first, second, and third storage cavities are semi-circular. A baffle is provided in the first storage cavity. The baffle includes a flat surface, a second arc surface, an arc concave surface, and the second arc surface connected together. The flat end of the baffle is connected to the upper die head.

[0012] Preferably, the extrusion gap further includes an adjustment cavity disposed between the second storage cavity and the third storage cavity. The adjustment cavity is provided with two half-die, which are trapezoidal in shape. The two half-die are slidably disposed on the upper die head and the lower die head respectively, so that the distance between the two half-die is gradually reduced, and the end with the smaller distance between the two half-die faces the extrusion port.

[0013] Preferably, the frame is further provided with a drying chamber, which is provided with a drying zone and a regeneration zone. The tail end of the drying zone and the regeneration zone are connected by an axial flow duct fan. A dehumidifier is provided in the regeneration zone. The dehumidifier draws in gas from the regeneration zone through the air inlet, and the air outlet of the dehumidifier is connected to the head end of the drying zone through a duct to introduce dry gas.

[0014] The drying zone is equipped with heated conveyor rollers and heated jet devices. The current collector coated with double-layer electrode sheets enters the drying chamber through the heated conveyor rollers and is heated to dry the double-layer electrode sheets.

[0015] The heating jet device is used to heat the gas in the drying zone and spray the heated gas onto the double-layer electrode to heat and dry the double-layer electrode.

[0016] Preferably, the heating jet device includes a housing, inside which an air inlet chamber and a filter chamber are provided, and a filter screen is provided between the air inlet chamber and the filter chamber. Air inlets are provided on both sides of the air inlet chamber, and the gas in the drying zone enters the air inlet chamber through the air inlet and enters the filter chamber through the filter screen.

[0017] A heating tube is installed inside the air intake chamber. The heating tube has two air blowing pipes that extend out of the air intake chamber and face the double-layer electrode. An air supply pipe is installed between the filter chamber and the heating tube. A blower is installed in the air supply pipe. The blower delivers the gas in the filter chamber to the heating tube. The heated gas is blown out through the air blowing pipes.

[0018] Preferably, the filter screen is strip-shaped, and the upper end of the housing has holes on both sides for the filter screen to pass through. A rotating shaft is provided at the top of the housing, and gears are provided at both ends of the rotating shaft. Toothed openings are provided on both sides of the filter screen. The filter screen is wound around the rotating shaft. The rotating shaft drives the filter screen to rotate through the gears inserted into the toothed openings of the filter screen, so that the filter screen passes through the holes and rotates around the upper end of the housing. A vacuum cleaner is provided on the outer side of the upper end of the housing to suck up the dust on the filter screen.

[0019] Preferably, the air blowing pipe is provided with an adjustment plate and an angle adjustment driver that drives the adjustment plate to swing. The adjustment plate is hinged to the outlet end of the air blowing pipe, one end of the angle adjustment driver is fixed to the housing, and the other end of the angle adjustment driver is hinged to the adjustment plate.

[0020] The beneficial effects of this invention are as follows: A current collector is placed on the feeding roller, and then wound around the horizontal correction device. After being corrected by the horizontal correction device, the current collector is wound around the first heating roller. A first extrusion coating device is located on one side of the first heating roller and coats the first electrode slurry onto the current collector to form a first electrode layer. After the current collector is heated by the heater, the surface of the first electrode layer dries, increasing its surface tension and facilitating subsequent coating operations. The current collector is wound around the second heating roller, and a second extrusion coating device is located at the end of the second heating roller near the heater and coats the second electrode slurry onto the first electrode layer to form a second electrode layer. The first and second electrode layers are bonded together to form a double-layer electrode, making it less prone to mixing and resulting in a more stable double-layer electrode structure. This allows for easy control of the gradient distribution of the electrode structure, enabling the achievement of a high-porosity upper layer and a high-density lower layer, thus combining the advantages of high energy density and super-fast charging. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the frame structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the heater of the present invention.

[0024] Figure 4 This is a schematic diagram of the exploded state structure of the horizontal correction device of the present invention.

[0025] Figure 5 This is an exploded structural diagram of the first extrusion coating apparatus or the second extrusion coating apparatus of the present invention.

[0026] Figure 6 This is a schematic diagram of the tension adjuster of the present invention.

[0027] Figure 7 This is a schematic diagram of the drying chamber of the present invention.

[0028] Figure 8 This is a schematic diagram of the decomposition state structure of the drying chamber of the present invention.

[0029] Figure 9 This is a schematic diagram of the heating jet device of the present invention.

[0030] Figure 10 This is a schematic diagram of the exploded state structure of the heating jet device of the present invention.

[0031] The reference numerals in the figures include:

[0032] 1. Frame; 11. Feeding roller; 12. First heating roller; 13. Second heating roller; 14. Heater; 141. Mounting frame; 142. First heater; 143. Second heater; 144. Obstruction adjusting cylinder; 2. Horizontal correction device; 21. Support; 22. Correction platform; 23. Correction roller; 24. Correction driver; 25. Slide rail; 26. Pulley; 3A. First extrusion coating device; 3B. Second extrusion coating device; 31. Upper die; 32. Lower die; 33. Extrusion gap; 34. Extrusion port; 35. First storage chamber; 36. Second storage chamber; 37. Third storage chamber; 38. Stop bar; 381. Flat surface; 382. First arc surface; 383. 384. Second arc surface; 39. Adjustment cavity; 391. Half mold; 4. Tension adjuster; 41. Adjustment limiter; 411. Eccentric wheel; 42. Adjustment frame; 421. Adjustment limit groove; 43. Telescopic adjuster; 44. Tension roller; 5. Drying chamber; 51. Drying area; 52. Regeneration area; 53. Dehumidifier; 54. Heated conveyor roller; 6. Heated jet device; 61. Housing; 611. Belt hole; 62. Air inlet; 621. Air inlet; 63. Filter chamber; 64. Filter screen; 641. Toothed mouth; 65. Heating tube; 651. Air blowing tube; 66. Rotating shaft; 661. Gear; 67. Vacuum cleaner; 68. Adjustment plate; 681. Angle adjustment driver. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings.

[0034] like Figures 1 to 10 As shown, a battery electrode coating apparatus of the present invention includes a frame 1. The lower part of the frame 1 is provided with a feeding roller 11 and a horizontal correction device 2. The upper part of the frame 1 is provided with a first heating roller 12, a first extrusion coating device 3A, a heater 14, a second heating roller 13, and a second extrusion coating device 3B. The heater 14 is an infrared heater. The first extrusion coating device 3A and the second extrusion coating device 3B are used to extrude a first electrode slurry and a second electrode slurry, respectively. The conductive agent content of the first electrode slurry and the second electrode slurry are different. Of course, the particle size of the active particles of the first electrode slurry and the second electrode slurry can also be different or the types of active particles can be different. For example, the first electrode slurry is a high energy density slurry and the second electrode slurry is a high power slurry.

[0035] In use, the current collector is placed on the feeding roller 11 and wound around the horizontal correction device 2. After being corrected by the horizontal correction device 2, the current collector is wound around the first heating roller 12. The first extrusion coating device 3A is set on one side of the first heating roller 12 and coats the first electrode slurry onto the current collector to form the first electrode layer. After the current collector is heated by the heater 14, the surface of the first electrode layer is dried, increasing the surface tension of the first electrode layer, which facilitates subsequent coating operations. The current collector is wound around the second heating roller 13. The second extrusion coating device 3B is set at the end of the second heating roller 13 near the heater 14 and coats the second electrode slurry onto the first electrode layer to form the second electrode layer. The first electrode layer and the second electrode layer are bonded together to form a double-layer electrode, making it less likely for the first electrode layer and the second electrode layer to mix, thus making the double-layer electrode structure more stable. This facilitates the control of the gradient distribution of the electrode structure, so as to achieve a high porosity structure in the upper layer and a high compaction density structure in the lower layer, taking into account both the advantages of high energy density and super-fast charging.

[0036] In practical use, the heater 14 includes a mounting frame 141, a first heater 142, a second heater 143, and a shielding adjustment cylinder 144. The mounting frame 141 is rotatably fixed to the frame 1. The first heater 142 is fixed to the upper inner side of the mounting frame 141, and the second heater 143 is fixed to the lower inner side of the mounting frame 141. The shielding adjustment cylinder 144 covers the second heater 143 and is slidably connected to the mounting frame 141. By adjusting the shielding area of ​​the shielding adjustment cylinder 144 and the second heater 143, the range of radiative heat transfer of the second heater 143 can be adjusted, thereby adjusting the drying speed and drying range of the edge of the double-layer electrode and preventing the edge of the double-layer electrode from being over-dried. Specifically, a groove is provided on the lower outer side of the mounting frame 141, and a slider is provided on the shielding adjustment cylinder 144. The shielding adjustment cylinder 144 is slidably connected to the groove of the mounting frame 141 through the slider. Of course, the shielding adjustment cylinder 144 can also be covered by the first heater 142 and slidably connected to the mounting frame 141 to adjust the shielding area of ​​the shielding adjustment cylinder 144 and the first heater 142, thereby adjusting the range of radiative heat transfer of the first heater 142.

[0037] The horizontal correction device 2 in this embodiment includes a support 21, a correction platform 22, and a correction roller 23. The correction platform 22 is rotatably mounted on the support 21. In actual use, the correction platform 22 can be rotatably mounted on the support 21 via bearings. The correction roller 23 is rolled on the end of the correction platform 22 facing the feeding roller 11 to facilitate the transfer of the current collector. A correction driver 24 is provided between the support 21 and the correction platform 22. The two ends of the correction driver 24 are hinged to the support 21 and the correction platform 22, respectively. The correction driver 24 is a cylinder.

[0038] The bracket 21 is equipped with a slide rail 25, and the correction platform 22 is equipped with a pulley 26. The correction platform 22 is connected to the slide rail 25 of the bracket 21 through the pulley 26. The correction driver 24 drives the correction platform 22 and the bracket 21 to rotate, so that the correction platform 22 and the bracket 21 are kept horizontal, so that the current collector is transmitted horizontally and wrinkles of the current collector are avoided.

[0039] In this embodiment, a tension adjuster 4 is provided between the horizontal correction device 2 and the first heating roller 12. The tension adjuster 4 includes an adjustment limiter 41, an adjustment frame 42, a telescopic adjuster 43, and a tension roller 44. The adjustment limiter 41 is fixed to the frame 1 and is a worm gear reducer. The telescopic adjuster 43 is a cylinder. The adjustment limiter 41 is provided with an eccentric wheel 411, the adjustment frame 42 is provided with an adjustment limit groove 421, and the tension roller 44 is rotatably disposed at one end of the adjustment frame 42 near the first heating roller 12.

[0040] In use, the telescopic adjuster 43 is fixed to the frame 1 and drives the adjusting frame 42 closer to the first heating drum 12, so that the adjusting limit groove 421 of the adjusting frame 42 slides along the eccentric wheel 411. The adjusting limit groove 421 abuts against the eccentric wheel 411, restricting the adjustment of the adjusting frame 42 and preventing excessive tension in the collector when the adjusting frame 42 reaches the adjustment position. Driving the adjusting frame 42 away from the first heating drum 12 by the telescopic adjuster 43 can reduce the tension in the collector.

[0041] In actual use, by adjusting the angle of the eccentric wheel 411 by adjusting the limiter 41, the adjustment range of the adjustment frame 42 can be adjusted, which makes it easier to adjust the tension of the collector.

[0042] In this embodiment, both the first extrusion coating apparatus 3A and the second extrusion coating apparatus 3B include an upper die head 31 and a lower die head 32. An extrusion gap 33 is provided between the upper die head 31 and the lower die head 32. An extrusion port 34 is provided at one end of the extrusion gap 33. A first storage chamber 35, a second storage chamber 36, and a third storage chamber 37 are sequentially arranged in the direction of the extrusion port 34 in the lower die head 32. The first storage chamber 35, the second storage chamber 36, and the third storage chamber 37 are all connected to the extrusion gap 33. The flow rate of the electrode slurry can be easily adjusted through the first storage chamber 35, the second storage chamber 36, and the third storage chamber 37, so that the electrode slurry flows more stably in the extrusion gap 33.

[0043] The first storage cavity 35, the second storage cavity 36, and the third storage cavity 37 are semi-circular. A baffle 38 is provided in the first storage cavity 35. The baffle 38 includes a flat surface 381, a second arc surface 384, an arc concave surface 383, and the second arc surface 384 connected together. The flat surface 381 end of the baffle 38 is connected to the upper die head 31, so that the baffle 38 is fixed in the first storage cavity 35. In use, when the electrode slurry flows through the arc concave surface 383, the electrode slurry mixes with each other between the first storage cavity 35 and the arc concave surface 383, thereby reducing the flow rate and making the flow of the electrode slurry more stable.

[0044] The extrusion gap 33 in this embodiment also includes an adjustment cavity 39 disposed between the second storage cavity 36 and the third storage cavity 37. The adjustment cavity 39 is provided with two half molds 391. The half molds 391 are trapezoidal. The two half molds 391 are slidably disposed on the upper die head 31 and the lower die head 32 respectively, so that the distance between the two half molds 391 gradually decreases. The end with the smaller distance between the two half molds 391 faces the extrusion port 34. By adjusting the distance between the two half molds 391, the pressure of the electrode slurry can be adjusted, thereby affecting the extrusion speed of the electrode slurry. In actual use, cylinders are provided on the outer side of the upper die head 31 and the lower die head 32 to drive the two half molds 391 to move closer or further away. The operation of the cylinders makes the two half molds 391 move closer or further away.

[0045] In this embodiment, the frame 1 is further provided with a drying chamber 5, which contains a drying zone 51 and a regeneration zone 52. The tail end of the drying zone 51 and the regeneration zone 52 are connected by an axial flow duct fan, allowing the gas in the drying zone 51 to be transported to the regeneration zone 52. A dehumidifier 53 is provided in the regeneration zone 52, which draws in the gas from the regeneration zone 52 through its air inlet, thus drying the gas in the regeneration zone 52. The air outlet of the dehumidifier 53 is connected to the head end of the drying zone 51 through a duct and introduces dry gas.

[0046] The drying zone 51 is equipped with a heating conveyor roller 54 and a heating jet device 6. The current collector coated with double-layer electrode sheets enters the drying chamber 5 through the heating conveyor roller 54 and is heated to dry the double-layer electrode sheets.

[0047] The heating jet device 6 is used to heat the gas in the drying zone 51 and spray the heated gas onto the double-layer electrode to heat and dry the double-layer electrode.

[0048] The heating jet device 6 of this embodiment includes a housing 61. An air inlet chamber 62 and a filter chamber 63 are provided inside the housing 61. A filter screen 64 is provided between the air inlet chamber 62 and the filter chamber 63. An air inlet 621 is provided on both sides of the air inlet chamber 62. The gas in the drying zone 51 enters the air inlet chamber 62 through the air inlet 621 and enters the filter chamber 63 through the filter screen 64.

[0049] A heating tube 65 is installed inside the air inlet chamber 62. The temperature of the surface of the heating tube 65 simultaneously heats the gas inside the air inlet chamber 62, ensuring that the gas is preheated before entering the filter chamber 63, thus making the heating of the gas in the drying zone 51 more efficient. The heating tube 65 has two air blowing pipes 651 extending from the air inlet chamber 62 and towards the double-layer electrode. An air supply pipe is provided between the filter chamber 63 and the heating tube 65, and a blower is installed in the air supply pipe. Specifically, the air inlet of the blower is connected to the filter chamber 63, and the air outlet of the blower is connected to the heating tube 65. In use, the blower delivers the gas from the filter chamber 63 to the heating tube 65, and the heated gas is blown out through the air blowing pipes 651.

[0050] In this embodiment, the filter 64 is strip-shaped. Pass-through holes 611 for the filter 64 are provided on both sides of the upper end of the housing 61. A rotating shaft 66 is provided at the top of the housing 61, with gears 661 at both ends. Toothed openings 641 are provided on both sides of the filter 64, which is wound around the rotating shaft 66. During maintenance, the rotating shaft 66 is started, and the gears 661 are inserted into the toothed openings 641 of the filter 64, causing the filter 64 to rotate. This allows the filter 64 to pass through the holes 611 and rotate around the upper end of the housing 61. A vacuum cleaner 67 is provided on the outer side of the upper end of the housing 61 to remove dust from the filter 64, facilitating cleaning of the filter 64.

[0051] In this embodiment, the air blowing pipe 651 is provided with an adjustment plate 68 and an angle adjustment driver 681 for driving the adjustment plate 68 to swing. The adjustment plate 68 is hinged to the outlet end of the air blowing pipe 651. One end of the angle adjustment driver 681 is fixed to the housing 61, and the other end of the angle adjustment driver 681 is hinged to the adjustment plate 68, which facilitates the adjustment of the angle of the adjustment plate 68, affecting the direction of the gas blown out through the outlet end of the air blowing pipe 651, so that the gas in the drying zone 51 can circulate better, and the temperature in the drying zone 51 can be more uniform, thereby making the double-layer electrode sheet in the drying zone 51 uniformly heated and dried, ensuring the yield of the double-layer electrode sheet.

[0052] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery electrode coating apparatus, characterized in that: The machine includes a frame (1), the lower part of which is provided with a feeding roller (11) and a horizontal correction device (2), and the upper part of which is provided with a first heating roller (12), a first extrusion coating device (3A), a heater (14), a second heating roller (13) and a second extrusion coating device (3B). The first extrusion coating device (3A) and the second extrusion coating device (3B) are used to extrude the first electrode slurry and the second electrode slurry, respectively. The current collector is placed on the feeding roller (11), and the current collector is wound around the horizontal correction device (2) from the feeding roller (11). After being corrected by the horizontal correction device (2), the current collector is wound around the first heating roller (12). The first extrusion coating device (3A) is set on one side of the first heating roller (12) and coats the first electrode slurry onto the current collector to form the first electrode layer. After the current collector is heated by the heater (14), the surface of the first electrode layer is dried. The current collector is wound around the second heating roller (13). The second extrusion coating device (3B) is set at one end of the second heating roller (13) near the heater (14) and coats the second electrode slurry onto the first electrode layer to form the second electrode layer. The first electrode layer and the second electrode layer are bonded together to form a double-layer electrode. The frame (1) is also provided with a drying chamber (5), which is provided with a drying zone (51) and a regeneration zone (52). The tail end of the drying zone (51) and the regeneration zone (52) are connected by an axial flow duct fan. A dehumidifier (53) is provided in the regeneration zone (52). The dehumidifier (53) draws in the gas in the regeneration zone (52) through the air inlet. The air outlet of the dehumidifier (53) is connected to the head end of the drying zone (51) through a pipe and introduces dry gas. The drying zone (51) is equipped with a heating conveyor roller (54) and a heating jet device (6). The current collector coated with double-layer electrode sheets enters the drying chamber (5) through the heating conveyor roller (54) and heats the current collector to dry the double-layer electrode sheets. The heating jet device (6) is used to heat the gas in the drying zone (51) and spray the heated gas onto the double-layer electrode to heat and dry the double-layer electrode. The heating jet device (6) includes a housing (61), an air inlet chamber (62) and a filter chamber (63) are provided inside the housing (61), a filter screen (64) is provided between the air inlet chamber (62) and the filter chamber (63), and an air inlet (621) is provided on both sides of the air inlet chamber (62). The gas in the drying zone (51) enters the air inlet chamber (62) through the air inlet (621) and enters the filter chamber (63) through the filter screen (64). A heating tube (65) is provided in the air inlet chamber (62). The heating tube (65) is provided with two air blowing pipes (651) that extend out of the air inlet chamber (62) and face the double-layer electrode. An air supply pipe is provided between the filter chamber (63) and the heating tube (65). A blower is provided in the air supply pipe. The blower delivers the gas in the filter chamber (63) to the heating tube (65). The heated gas is blown out through the air blowing pipes (651).

2. The battery electrode coating apparatus according to claim 1, characterized in that: The horizontal correction device (2) includes a bracket (21), a correction platform (22), and a correction roller (23). The correction platform (22) is rotatably mounted on the bracket (21), and the correction roller (23) is rotatably mounted on one end of the correction platform (22) facing the feeding roller (11). A correction driver (24) is provided between the bracket (21) and the correction platform (22), and the two ends of the correction driver (24) are respectively hinged to the bracket (21) and the correction platform (22). The bracket (21) is provided with a slide rail (25), and the correction platform (22) is provided with a pulley (26). The correction platform (22) is connected to the slide rail (25) of the bracket (21) through the pulley (26). The correction driver (24) drives the correction platform (22) and the bracket (21) to rotate, so that the correction platform (22) and the bracket (21) remain horizontal.

3. The battery electrode coating apparatus according to claim 1, characterized in that: A tension adjuster (4) is provided between the horizontal correction device (2) and the first heating drum (12). The tension adjuster (4) includes an adjustment limiter (41), an adjustment frame (42), a telescopic adjuster (43), and a tension roller (44). The adjustment limiter (41) is fixed to the frame (1). The adjustment limiter (41) is provided with an eccentric wheel (411). The adjustment frame (42) is provided with an adjustment limit groove (421). The tension roller (44) is rolled at one end of the adjustment frame (42) near the first heating drum (12). The telescopic adjuster (43) is fixed to the frame (1) and drives the adjustment frame (42) to move closer to or away from the first heating drum (12) so that the adjustment limit groove (421) of the adjustment frame (42) slides along the eccentric wheel (411). The adjustment limit groove (421) abuts against the eccentric wheel (411), and the adjustment frame (42) is restricted in its adjustment.

4. The battery electrode coating apparatus according to claim 1, characterized in that: The first extrusion coating apparatus (3A) and the second extrusion coating apparatus (3B) both include an upper die (31) and a lower die (32). There is an extrusion gap (33) between the upper die (31) and the lower die (32). An extrusion port (34) is provided at one end of the extrusion gap (33). A first storage cavity (35), a second storage cavity (36) and a third storage cavity (37) are arranged sequentially in the direction of the extrusion port (34) in the lower die (32). The first storage cavity (35), the first storage cavity (36) and the third storage cavity (37) are all connected to the extrusion gap (33). The first storage cavity (35), the second storage cavity (36) and the third storage cavity (37) are semi-circular. A baffle (38) is provided in the first storage cavity (35). The baffle (38) is formed by connecting the flat surface (381), the second arc surface (384), the arc concave surface (383) and the second arc surface (384). The flat surface (381) end of the baffle (38) is connected to the upper die head (31).

5. The battery electrode coating apparatus according to claim 4, characterized in that: The extrusion gap (33) also includes an adjustment cavity (39) disposed between the second storage cavity (36) and the third storage cavity (37). The adjustment cavity (39) is provided with two half molds (391). The half molds (391) are trapezoidal. The two half molds (391) are slidably disposed on the upper die head (31) and the lower die head (32) respectively, so that the distance between the two half molds (391) is gradually reduced. The end with the smaller distance between the two half molds (391) faces the extrusion port (34).

6. The battery electrode coating apparatus according to claim 1, characterized in that: The filter screen (64) is strip-shaped. The upper end of the housing (61) is provided with two side holes (611) for the filter screen (64) to pass through. The top of the housing (61) is provided with a rotating shaft (66). Both ends of the rotating shaft (66) are provided with gears (661). The filter screen (64) is provided with toothed mouths (641) on both sides. The filter screen (64) is wound around the rotating shaft (66). The rotating shaft (66) drives the filter screen (64) to rotate by inserting the gears (661) into the toothed mouths (641) of the filter screen (64), so that the filter screen (64) rotates around the upper end of the housing (61) through the strip holes (611). A vacuum cleaner (67) is provided on the outer side of the upper end of the housing (61) to suck up the dust on the filter screen (64).

7. The battery electrode coating apparatus according to claim 1, characterized in that: The air blowing pipe (651) is provided with an adjustment plate (68) and an angle adjustment driver (681) that drives the adjustment plate (68) to swing. The adjustment plate (68) is hinged to the outlet end of the air blowing pipe (651). One end of the angle adjustment driver (681) is fixed to the housing (61), and the other end of the angle adjustment driver (681) is hinged to the adjustment plate (68).

Images