Single-sided air-discharge multi-channel oven for coating lithium battery electrodes

Abstract

This utility model relates to a multi-channel drying oven for coating lithium battery electrodes with a single-sided air outlet. The oven includes six drying ducts connected in a series of folding sections. The first, second, and third drying ducts blow hot air only onto side A of the electrode strip, while the fourth, fifth, and sixth drying ducts blow hot air only onto side B. A first air-bearing reversing roller is installed at the folding point between the second and third drying ducts, flexibly contacting side A of the electrode strip via airflow. A second air-bearing reversing roller is installed at the folding point between the fifth and sixth drying ducts, flexibly contacting side B of the electrode strip via airflow. This utility model reduces the space occupied by the oven through the folding and connecting design of the multiple air ducts, and dries side A and side B of the electrode strip separately through the first to sixth drying ducts.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery electrode coating equipment, and in particular to a multi-channel drying oven for single-sided air outlet lithium battery electrode coating. Background Technology

[0002] Currently, most lithium battery coating equipment adopts a folding-back double-layer coating scheme. The material strip is unwound onto the first coating equipment for A-side coating. After A-side coating, it enters the lower drying oven, and after drying, it exits the oven and enters the second coating equipment for B-side coating. After B-side coating, it enters the upper drying oven, and after drying, it exits the oven for rewinding. For example, a double-sided coating machine is disclosed in Chinese Utility Model Application No. 202120391885.8. In this type of scheme, the drying oven is double-layered, and the drying channel inside the oven is linearly arranged. The material strip's running trajectory in the oven is also linear, which makes the oven volume and number very large, requiring a large equipment installation space and high requirements for factory buildings and sites. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a multi-channel drying oven for coating lithium battery electrode sheets with a single-sided air outlet.

[0004] This utility model provides a multi-channel drying oven for coating lithium battery electrode sheets with single-sided air outlet. The oven includes a first drying duct, a second drying duct, a third drying duct, a fourth drying duct, a fifth drying duct, and a sixth drying duct that are sequentially connected and folded back within the oven. The first, second, and third drying ducts blow hot air only onto side A of the electrode sheet material, while the fourth, fifth, and sixth drying ducts blow hot air only onto side B of the electrode sheet material. A first air-bearing reversing roller is provided at the folding point between the second and third drying ducts, flexibly contacting side A of the electrode sheet material through airflow. A second air-bearing reversing roller is provided at the folding point between the fifth and sixth drying ducts, flexibly contacting side B of the electrode sheet material through airflow.

[0005] In some embodiments, a plurality of first material rollers are provided in the first drying duct, the second drying duct, and the third drying duct, and the first material rollers only contact the B side of the electrode strip. A plurality of second material rollers are provided in the fourth drying duct, the fifth drying duct, and the sixth drying duct, and the second material rollers only contact the A side of the electrode strip.

[0006] In some embodiments, the top of the first drying duct, the bottom of the second drying duct, and the top of the third drying duct are each provided with a plurality of first air outlets facing the A side of the electrode strip, and the first air outlets are located directly opposite the first material roller.

[0007] In some embodiments, the top of the fourth drying duct, the bottom of the fifth drying duct, and the top of the sixth drying duct are each provided with a plurality of second air outlets facing the B side of the electrode strip, and the second air outlets are positioned directly opposite the second material roller.

[0008] In some embodiments, the first drying duct is provided with a first inlet, the third drying duct is provided with a first outlet at its end, the fourth drying duct is provided with a second inlet, the sixth drying duct is provided with a second outlet, the first inlet and the second outlet are provided on the same side of the oven, and the first outlet and the second inlet are provided on the other side of the oven.

[0009] In some embodiments, a first coating device and a second coating device are also included. The first coating device is disposed outside the first inlet, and the second coating device is disposed between the first outlet and the second inlet. The first coating device coats side A of the electrode strip, and the second coating device coats side B of the electrode strip.

[0010] In some embodiments, the oven is provided with a plurality of static pressure chambers that are respectively connected to the first drying air duct, the second drying air duct, the third drying air duct, the fourth drying air duct, the fifth drying air duct, and the sixth drying air duct. Each static pressure chamber is provided with a return air inlet on both sides in the width direction of the electrode strip. The return air inlet is connected to the return air channel, and the return air channel is connected to the static pressure chamber to form a circulating air duct.

[0011] In some embodiments, the first heat insulation interlayer between the first drying air duct and the second drying air duct, and the second heat insulation interlayer between the fourth drying air duct and the fifth drying air duct, do not have static pressure chambers.

[0012] In some embodiments, a first rigid reversing roller is provided at the reversal point between the first drying duct and the second drying duct. The first rigid reversing roller contacts the B-side of the electrode strip, and the diameter of the first rigid reversing roller is greater than the thickness of the first heat insulation layer. A second rigid reversing roller is provided at the reversal point between the fourth drying duct and the fifth drying duct. The second rigid reversing roller contacts the A-side of the electrode strip, and the diameter of the second rigid reversing roller is greater than the thickness of the second heat insulation layer.

[0013] In some embodiments, both the first air-bearing reversing roller and the second air-bearing reversing roller include a roller body, the roller body is provided with a cavity for connecting an external air source, and the roller surface of the roller body is provided with air holes for blowing air outward.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by using a multi-channel folding and connecting design, the space occupied by the drying oven is reduced, and the utilization rate of factory space is improved. At the same time, the residence time of the electrode strip in the drying oven is extended, increasing the contact area and time between the hot air and the electrode strip, thereby improving the drying efficiency. The first to sixth drying air channels respectively blow air onto the A and B sides of the electrode strip, ensuring that both sides of the electrode are dried by hot air. The air flotation reversing roller performs flexible reversal, avoiding damage to the coating surface that is not completely dried, thus improving the production quality and efficiency of lithium battery electrodes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the planar structure of a single-sided air-outlet multi-channel drying oven for coating lithium battery electrode sheets according to an embodiment of this application.

[0016] Figure 2 This is a schematic diagram of the return air structure of a single-sided air outlet multi-channel oven for coating lithium battery electrode sheets, according to an embodiment of this application.

[0017] Figure label: 1. Drying oven; 11. First drying air duct; 12. Second drying air duct; 13. Third drying air duct; 14. Fourth drying air duct; 15. Fifth drying air duct; 16. Sixth drying air duct; 21. First air-float reversing roller; 22. Second air-float reversing roller; 23. Roller body; 24. Cavity; 25. Air hole; 31. First material roller; 32. Second material roller; 41. First rigid reversing roller; 42. Second rigid reversing roller; 51. First thermal insulation layer; 52. Second thermal insulation layer; 61. Static pressure chamber; 62. First air outlet; 63. Second air outlet; 64. Return air outlet; 65. Return air duct; 71. First feed inlet; 72. First discharge outlet; 73. Second discharge outlet; 74. Second feed inlet; 81. First coating device; 82. Second coating device; 83. Unwinding device; 84. Rewinding device; 9. Electrode strip; 91. Side A; 92. Side B. Detailed Implementation

[0018] The specific embodiments of this utility model are described with reference to the accompanying drawings.

[0019] refer to Figure 1 The figure shows a schematic diagram of the planar structure of a multi-channel oven 1 for coating lithium battery electrode sheets with a single-sided air outlet. The oven 1 adopts a multi-channel folding and connecting method, so that the electrode sheet strip 9 travels in a Z-shaped folding manner inside the oven 1, and the oven 1 occupies less space overall.

[0020] refer to Figures 1 to 2 A multi-channel drying oven 1 for coating lithium battery electrode sheets with single-sided air outlet includes an oven 1. Inside the oven 1, a first drying air duct 11, a second drying air duct 12, a third drying air duct 13, a fourth drying air duct 14, a fifth drying air duct 15, and a sixth drying air duct 16 are connected in a series of folded-back connections. The first drying air duct 11, the second drying air duct 12, and the third drying air duct 13 blow hot air only onto the A-side 91 of the electrode sheet material strip 9. The fourth drying air duct 14, the fifth drying air duct 15, and the sixth drying air duct 16 blow hot air only onto the B-side 92 of the electrode sheet material strip 9. A first air-bearing reversing roller 21 is provided at the folded-back point between the second drying air duct 12 and the third drying air duct 13, which flexibly contacts the A-side 91 of the electrode sheet material strip 9 through airflow. A second air-bearing reversing roller 22 is provided at the folded-back point between the fifth drying air duct 15 and the sixth drying air duct 16, which flexibly contacts the B-side 92 of the electrode sheet material strip 9 through airflow.

[0021] The single-sided air-discharge lithium battery electrode coating multi-channel oven 1 of this application reduces the space occupied by the oven 1 and improves the utilization rate of factory space through the folding and connecting design of multiple air channels. At the same time, it extends the residence time of the electrode strip 9 in the oven 1, increases the contact area and time between the hot air and the electrode strip 9, and improves the drying efficiency. The first to sixth drying air channels 16 respectively blow air to the A side 91 and B side 92 of the electrode strip 9 to ensure that both sides of the electrode are dried by hot air. The air flotation reversing roller is used for flexible reversal to avoid damage to the coating that is not completely dried, thereby improving the production quality and efficiency of lithium battery electrodes.

[0022] In order to support the electrode strip 9, in this embodiment, reference is made to... Figure 1 Multiple first material rollers 31 are provided in the first drying air duct 11, the second drying air duct 12, and the third drying air duct 13. The first material rollers 31 only contact the B side 92 of the electrode material strip 9. Multiple second material rollers 32 are provided in the fourth drying air duct 14, the fifth drying air duct 15, and the sixth drying air duct 16. The second material rollers 32 only contact the A side 91 of the electrode material strip 9.

[0023] Understandably, with this configuration, the first roller 31 and the second roller 32 can support the electrode strip 9, suspending it in the air. When hot air in each drying duct blows towards the electrode strip 9, it prevents the electrode strip 9 from being blown towards the inner wall of the duct. The first roller 31 only contacts the B side 92 of the electrode strip 9, avoiding damage to the coating on the A side 91 of the electrode strip 9. When the coating on the A side 91 of the electrode strip 9 is dried and cured through the first drying duct 11, the second drying duct 12, and the third drying duct 13, the second roller 32 only contacts the A side 91 of the electrode strip 9, thereby avoiding damage to the coating on the B side 92 of the electrode strip 9.

[0024] To improve drying efficiency, in this embodiment, reference is made to... Figure 1 For the coating drying of the A side 91 of the electrode strip 9, the top of the first drying air duct 11, the bottom of the second drying air duct 12, and the top of the third drying air duct 13 are all provided with a plurality of first air outlets 62 facing the A side 91 of the electrode strip 9. The first air outlets 62 are located directly opposite the first material roller 31.

[0025] For the coating drying of the B side 92 of the electrode strip 9, the top of the fourth drying air duct 14, the bottom of the fifth drying air duct 15, and the top of the sixth drying air duct 16 are all provided with multiple second air outlets 63 facing the B side 92 of the electrode strip 9. The second air outlets 63 are located directly opposite the second material roller 32.

[0026] Understandably, this setup maximizes the airflow at the outlets. The first outlet 62 and the second outlet 63 are positioned directly opposite the first roller 31 and the second roller 32, respectively, which better supports the electrode strip 9. At the same time, it ensures that the hot air can directly act on the coating of the electrode strip 9, avoiding the waste of heat energy and further improving the drying efficiency.

[0027] To optimize the layout of oven 1, in this embodiment, reference is made to... Figure 1 The first drying duct 11 is provided with a first feed inlet 71, the third drying duct 13 is provided with a first discharge outlet 72 at its end, the fourth drying duct 14 is provided with a second feed inlet 74, and the sixth drying duct 16 is provided with a second discharge outlet 73. The first feed inlet 71 and the second discharge outlet 73 are located on the same side of the oven 1, and the first discharge outlet 72 and the second feed inlet 74 are located on the other side of the oven 1.

[0028] Understandably, with the first inlet 71 and the first outlet 72 located on both sides of the oven 1, and the second outlet 73 and the second inlet 74 located on both sides of the oven 1, the electrode strip 9 enters the upper layer of the oven 1 through the first inlet 71 after coating side A 91. After drying the coating on side A 91, it exits the oven 1 through the first outlet 72. After coating side B 92, it enters the lower layer of the oven 1 through the second inlet 74. After drying the coating on side B 92, it exits the oven 1 through the second outlet 73. This layout design makes the path of the electrode strip 9 within the oven 1 more compact, reduces the overall size of the oven 1, and facilitates the continuous coating and drying of the electrode strip 9.

[0029] In order to perform double-sided coating on the electrode strip 9, in this embodiment, refer to Figure 1It also includes a first coating device 81 and a second coating device 82. The first coating device 81 is located outside the first feed inlet 71, and the second coating device 82 is located between the first discharge outlet 72 and the second feed inlet 74. The first coating device 81 coats the A side 91 of the electrode strip 9, and the second coating device 82 coats the B side 92 of the electrode strip 9.

[0030] Understandably, with this setup, after the electrode strip 9 is unwound, the first coating device 81 coats side A 91. After the coating on side A 91 is dried, side B 92 is coated on the second coating device 82 and then quickly enters the lower layer of the drying oven 1 for drying, thus achieving continuous double-sided coating and drying of the electrode strip 9.

[0031] To improve the utilization rate of hot air, in this embodiment, reference is made to... Figure 2 The oven 1 is provided with multiple static pressure chambers 61 that are respectively connected to the first drying air duct 11, the second drying air duct 12, the third drying air duct 13, the fourth drying air duct 14, the fifth drying air duct 15, and the sixth drying air duct 16. The static pressure chamber 61 is provided with return air inlets 64 on both sides of the electrode material strip 9 in the width direction. The return air inlets 64 are connected to the return air channel 65. The return air channel 65 is connected to the static pressure chamber 61 to form a circulating air duct.

[0032] It should be further explained that the circulating air duct is also equipped with a heating unit and a filtration and dust removal unit (not shown in the attached diagram). The heating unit heats the air in the circulating air duct, and the filtration and dust removal unit filters and removes dust from the air to ensure the cleanliness of the air inside the oven 1.

[0033] Understandably, this configuration, employing a double-sided return air system, avoids the unilateral lateral tension on the electrode strip 9 caused by the unilateral hot air flow in a single-sided return air system. This results in more stable operation of the electrode strip 9, a more balanced lateral drying effect for the coating, and thus improves product yield. The static pressure chamber 61 ensures a more uniform distribution of hot air, avoiding differences in drying effect caused by uneven air velocity. The return air channel 65 enables the recycling of hot air, reducing heat consumption and saving energy.

[0034] To reduce the height of oven 1, in this embodiment, reference is made to... Figure 1 The first heat insulation interlayer 51 between the first drying air duct 11 and the second drying air duct 12, and the second heat insulation interlayer 52 between the fourth drying air duct 14 and the fifth drying air duct 15, do not have static pressure chambers 61.

[0035] Understandably, with this setup, the static pressure chamber 61 requires a large space. By setting the static pressure chamber 61 only on one side of each drying air duct, the number of static pressure chambers 61 can be reduced, optimizing the structure of the oven 1 and thus reducing the height of the oven 1. The heat exchange between the first drying air duct 11 and the second drying air duct 12 is isolated by the first heat insulation layer 51, and the heat exchange between the fourth drying air duct 14 and the fifth drying air duct 15 is isolated by the second heat insulation layer 52.

[0036] In order to complete the reversal of the electrode strip 9 within the oven 1, in this embodiment, reference is made to... Figure 1 A first rigid reversing roller 41 is provided at the bend between the first drying air duct 11 and the second drying air duct 12. The first rigid reversing roller 41 contacts the B-side 92 of the electrode material strip 9. The diameter of the first rigid reversing roller 41 is greater than the thickness of the first heat insulation layer 51. A second rigid reversing roller 42 is provided at the bend between the fourth drying air duct 14 and the fifth drying air duct 15. The second rigid reversing roller 42 contacts the A-side 91 of the electrode material strip 9. The diameter of the second rigid reversing roller 42 is greater than the thickness of the second heat insulation layer 52.

[0037] Understandably, with this setup, four reversing points are set inside the drying oven 1. Flexible reversing is achieved by setting a first air-float reversing roller 21 at the reversing point between the second drying duct 12 and the third drying duct 13, and a second air-float reversing roller 22 at the reversing point between the fifth drying duct 15 and the sixth drying duct 16. Rigid reversing is achieved by setting a first rigid reversing roller 41 at the reversing point between the first drying duct 11 and the second drying duct 12, and a second rigid reversing roller 42 at the reversing point between the fourth drying duct 14 and the fifth drying duct 15, forming a Z-shaped reversing conveyor belt. The larger diameter reversing rollers can ensure the stability of the electrode material belt 9 during reversing.

[0038] In order to achieve flexible commutation, in this embodiment, reference is made to... Figure 1 The first air flotation reversing roller 21 and the second air flotation reversing roller 22 both include a roller body 23. The roller body 23 is provided with a cavity 24 for connecting an external air source. The roller surface of the roller body 23 is provided with air holes 25 for blowing air outward.

[0039] Understandably, with this configuration, the roller 23 can be either stationary or rotating. When stationary, the roller 23 can have air holes 25 only in the area of ​​the roller surface that contacts the electrode strip 9. The airflow ejected from the air holes 25 lifts the electrode strip 9 and suspends it outside the roller 23. When the roller 23 is set to rotate, the entire roller surface of the roller 23 is provided with air holes 25. The cavity 24 is connected to an external air source through a rotary joint, which can also lift the electrode strip 9 through airflow to achieve flexible contact. The intensity of the airflow ejected from the air holes 25 can be adjusted according to the tension of the electrode to further optimize the reversing effect of the electrode strip 9.

[0040] In this embodiment, the electrode strip 9 is unwound by the unwinding device 83, coated on side A 91 at the first coating device 81, then enters the first drying duct 11 of the upper oven 1 through the first feed port 71 for coating drying, folds back to the second drying duct 12 for drying via the first rigid reversing roller 41, folds back to the third drying duct 13 for further drying via the first air flotation reversing roller 21, and exits the oven 1 from the first discharge port 72 after the coating on side A 91 is dried, reaches the second coating device 82 for coating on side B 92, then enters the fourth drying duct 14 of the lower oven 1 through the second feed port 74 for coating drying, folds back to the fifth drying duct 15 for drying via the second reversing roller, folds back to the sixth drying duct 16 for further drying via the second air flotation reversing roller 22, and exits the oven 1 from the second discharge port 73 after the coating on side B 92 is dried, and is then wound up by the winding device 84.

[0041] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A single-sided air outlet lithium battery pole piece coating multi-channel oven, characterized in that, The device includes an oven, within which a first drying duct, a second drying duct, a third drying duct, a fourth drying duct, a fifth drying duct, and a sixth drying duct are sequentially connected and deflected. The first, second, and third drying ducts blow hot air only onto side A of the electrode strip, while the fourth, fifth, and sixth drying ducts blow hot air only onto side B of the electrode strip. A first air-bearing reversing roller is provided at the deflection point between the second and third drying ducts, flexibly contacting side A of the electrode strip through airflow. A second air-bearing reversing roller is provided at the deflection point between the fifth and sixth drying ducts, flexibly contacting side B of the electrode strip through airflow.

2. The single-sided air outlet lithium battery pole piece coating multi-channel oven of claim 1, wherein, Multiple first material rollers are provided in the first, second, and third drying air ducts. The first material rollers only contact the B side of the electrode strip. Multiple second material rollers are provided in the fourth, fifth, and sixth drying air ducts. The second material rollers only contact the A side of the electrode strip.

3. The single-sided air out lithium battery pole piece coating multi-channel oven of claim 2, wherein, The top of the first drying air duct, the bottom of the second drying air duct, and the top of the third drying air duct are each provided with a first air outlet facing the A side of the electrode strip. The first air outlet is located directly opposite the first material roller.

4. The single-sided air out lithium battery pole piece coating multi-channel oven of claim 2, wherein, The top of the fourth drying air duct, the bottom of the fifth drying air duct, and the top of the sixth drying air duct are each provided with a plurality of second air outlets facing the B side of the electrode strip, and the second air outlets are located directly opposite the second material roller.

5. The single-sided air out lithium battery pole piece coating multi-pass oven of claim 1, wherein, The first drying duct is provided with a first inlet, the third drying duct is provided with a first outlet at its end, the fourth drying duct is provided with a second inlet, and the sixth drying duct is provided with a second outlet. The first inlet and the second outlet are located on the same side of the oven, and the first outlet and the second inlet are located on the other side of the oven.

6. The single-sided air out lithium battery pole piece coating multi-channel oven of claim 5, wherein, It also includes a first coating device and a second coating device. The first coating device is located outside the first feed inlet, and the second coating device is located between the first discharge outlet and the second feed inlet. The first coating device coats side A of the electrode strip, and the second coating device coats side B of the electrode strip.

7. The single-sided air out lithium battery pole piece coating multi-pass oven of claim 1, wherein, The oven is provided with multiple static pressure chambers that are respectively connected to the first drying air duct, the second drying air duct, the third drying air duct, the fourth drying air duct, the fifth drying air duct, and the sixth drying air duct. Each static pressure chamber is provided with a return air inlet on both sides in the width direction of the electrode material strip. The return air inlet is connected to the return air channel, and the return air channel is connected to the static pressure chamber to form a circulating air duct.

8. The single-sided air out lithium battery pole piece coating multi-channel oven of claim 7, wherein, The first heat insulation interlayer between the first drying air duct and the second drying air duct, and the second heat insulation interlayer between the fourth drying air duct and the fifth drying air duct, do not have static pressure chambers.

9. The single-sided air out lithium battery pole piece coating multi-pass oven of claim 8, wherein, A first rigid reversing roller is arranged at the turn-back between the first and second drying air ducts, the first rigid reversing roller being in contact with the B face of the pole piece material belt, the diameter of the first rigid reversing roller being greater than the thickness of the first thermal insulation layer; a second rigid reversing roller is arranged at the turn-back between the fourth and fifth drying air ducts, the second rigid reversing roller being in contact with the A face of the pole piece material belt, the diameter of the second rigid reversing roller being greater than the thickness of the second thermal insulation layer.

10. The single-sided air out lithium battery pole piece coating multi-pass oven of claim 1, wherein, The first and second air floating reversing rollers each comprise a roller body, a cavity in the roller body being connected to an external air source, and air holes in the roller surface of the roller body blowing air outward.

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