Air duct pipeline structure for uncoiling and baking pole piece

Abstract

The utility model relates to an air duct pipeline structure for uncoiling and baking a pole piece, which comprises a drying chamber, a circulating pipeline, a fresh air pipeline, an outer exhaust pipeline, an air supply pipeline and a heat exchange box, the drying chamber is used for carrying out hot air baking and dewatering operation on a pole piece material belt which is continuously conveyed in the drying chamber, and the drying chamber is communicated with the circulating pipeline, the outer exhaust pipeline and the air supply pipeline. The circulation pipeline is sequentially provided with a fresh air section, a power section, a temperature control section, a filtering section and an air supply section, the fresh air section is communicated with a fresh air pipeline, the fresh air pipeline is connected with an external exhaust pipeline through a heat exchange box, and fresh air of the fresh air pipeline exchanges heat with exhaust air of the external exhaust pipeline at the heat exchange box; the power section is provided with a circulating fan, the temperature control section is provided with a heating device for heating gas in a circulating pipeline, the temperature control section is connected with a cooling pipeline, and an air valve is arranged between the cooling pipeline and the temperature control section. According to the utility model, moisture in the lithium battery pole piece can be effectively removed, and the quality and the consistency of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery pole piece production, and particularly relates to an air duct pipeline structure for unwinding and baking pole pieces. Background Art

[0002] The lithium battery pole pieces for winding need to go through processes such as coating, rolling, and slitting in sequence. After the rolling process, there are clear requirements for the water content of the lithium battery pole pieces before slitting. The drying condition of the pole pieces directly affects the quality of the battery. The water in the pole pieces needs to be removed, and the moisture content needs to be controlled to be qualified before slitting. This requires using special baking equipment to bake the pole pieces after the rolling process to remove the moisture. The existing equipment for baking and dewatering pole pieces has high energy consumption, and the baking efficiency needs to be improved. Content of the Utility Model

[0003] In order to solve the deficiencies of the prior art, the utility model provides an air duct pipeline structure for unwinding and baking pole pieces.

[0004] The utility model provides an air duct pipeline structure for unwinding and baking pole pieces, including a drying chamber, a circulation pipeline, a fresh air pipeline, an external exhaust pipeline, a supply air pipeline, and a heat exchange box. The drying chamber performs hot air baking and dewatering operations on the continuously running pole piece strip. The drying chamber is communicated with the circulation pipeline, the external exhaust pipeline, and the supply air pipeline. The circulation pipeline is sequentially provided with a fresh air section, a power section, a temperature control section, a filtration section, and a supply air section. The fresh air section is communicated with the fresh air pipeline. The fresh air pipeline is connected to the external exhaust pipeline through the heat exchange box. The fresh air in the fresh air pipeline exchanges heat with the exhaust air in the external exhaust pipeline at the heat exchange box. The power section is provided with a circulation fan for promoting the flow of gas in the circulation pipeline. The temperature control section is provided with a heating device for heating the gas in the circulation pipeline. The temperature control section is connected with a cooling pipeline. A wind valve is arranged between the cooling pipeline and the temperature control section. An air filter element is arranged in the filtration section. The supply air section is communicated with the supply air pipeline.

[0005] In some embodiments, the heat exchange box is provided with a fresh air inlet communicated with the fresh air pipeline, and a primary filter element is installed at the fresh air inlet.

[0006] In some embodiments, the primary filter element is fixed on the heat exchange box through a fixing frame.

[0007] In some embodiments, the cooling pipeline is provided with a cooling fan.

[0008] In some embodiments, the external exhaust pipeline is provided with an exhaust fan.

[0009] In some of the embodiments, a fresh air channel and an exhaust air channel are provided in the heat exchange box, and the fresh air channel and the exhaust air channel are respectively connected to the fresh air duct and the external exhaust air duct, and the fresh air channel and the exhaust air channel are separated by a layered heat exchange medium, and the fresh air gas in the fresh air channel and the exhaust air gas in the exhaust channel exchange heat through the heat exchange medium.

[0010] In some of the embodiments, air valves are provided in the circulation pipeline, the external exhaust air pipeline, the fresh air pipeline, and the supply air pipeline.

[0011] In some embodiments, the air valve includes a fan blade, a mounting frame, a rotating rod and an actuator. The fan blade is installed on the air flow path through the mounting frame. The fan blade is rotatably set on the mounting frame by the rotating rod. The actuator is transmission-connected to the rotating rod to drive the fan blade to rotate.

[0012] In some embodiments, the actuator includes a driving rod, a rotating hand wheel and a connecting seat, the driving rod is connected to the rotating rod at the connecting seat through a transmission, and the rotating hand wheel is installed at the end of the driving rod.

[0013] In some of the embodiments, the air filter element is installed in the filter section of the circulation pipeline in a pull-out manner through a supporting plate, and a handle is provided on the outer side of the supporting plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects: it can effectively remove moisture from the pole pieces of lithium batteries and ensure that they are in a good drying state, thereby improving the quality and consistency of the battery; a channel for gas circulation is formed through the circulation pipeline and the drying chamber; a part of the gas with water vapor is discharged through the external exhaust pipeline, and fresh air is supplemented through the fresh air pipeline and the fresh air section to maintain the air pressure in the drying chamber; the fresh air is heated by the heat exchanger to reduce heat loss and energy consumption; the gas flow is promoted by the power section to ensure that the hot air can take away the moisture on the pole piece and the water vapor in the drying chamber; the gas is heated by the temperature control section to ensure that the temperature of the hot air gas used to bake the pole piece meets the requirements, and the hot gas in the air duct pipeline can be quickly discharged through the cooling pipeline to accelerate the cooling process of the drying chamber; the function of filtering the gas by the filtering section ensures that the hot air gas used to bake the pole piece is relatively clean to avoid impurities adhering to the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is one of the three-dimensional structural schematic diagrams of the air duct pipeline structure used for unwinding and baking of the electrode in the embodiment of the present application.

[0016] Figure 2 This is the second three-dimensional structural schematic diagram of the air duct structure used for unwinding and baking the electrode in the embodiment of the present application.

[0017] Figure 3It is a schematic diagram of the internal structure of the heat exchange box according to an embodiment of the present application.

[0018] Figure 4 It is a schematic diagram of the internal structure between the cooling pipeline and the temperature control section according to an embodiment of the present application.

[0019] Figure 5 It is a schematic diagram of the structure of the air valve according to an embodiment of the present application.

[0020] Reference numerals: 101, air inlet; 102, air outlet; 103, return air inlet; 104, fresh air inlet; 201, exhaust gas; 202, fresh air.

[0021] 1, drying chamber; 11, upper air chamber; 12, lower air chamber;

[0022] 2, circulation pipeline; 21, fresh air section; 22, power section; 23, temperature control section; 24, filtration section; 25, air supply section; 26, circulation fan; 27, heating device;

[0023] 3, fresh air pipeline;

[0024] 4, external exhaust pipeline; 41, exhaust fan;

[0025] 5, air supply pipeline;

[0026] 6, heat exchange box; 61, fresh air channel; 62, exhaust air channel; 63, heat exchange medium; 64, primary filter element; 65, fixing frame; 66, edge guard;

[0027] 7, cooling pipeline; 71, cooling fan;

[0028] 8, air filter element; 81, support plate; 82, handle;

[0029] 9, air valve; 91, fan blade; 92, mounting frame; 93, rotating rod; 94, actuator; 941, driving rod; 942, rotating handwheel; 943, connecting seat; 944, indicating disk; 945, pointer; 95, connecting rod. Detailed implementation manners

[0030] The detailed implementation manners of the present invention are introduced with reference to the accompanying drawings.

[0031] Reference Figure 1, The figure is a three-dimensional structural schematic diagram of the air duct pipeline structure for unwinding and baking the electrode sheet. The air duct pipeline structure for unwinding and baking the electrode sheet is a multi-hot air channel structure. The cuboid box structure in the upper left corner of the figure is the drying chamber 1. The drying chamber 1 is divided into an upper air chamber 11 and a lower air chamber 12. Each of the upper air chamber 11 and the lower air chamber 12 has an air inlet 101. The upper air chamber 11 is also provided with an air outlet 102 and a return air inlet 103. A circulating pipeline 2 is provided between the air inlet 101 and the return air inlet 103 to form a channel for gas to circulate and flow with the drying chamber 1.

[0032] Reference Figures 1 to 5 , An air duct pipeline structure for unwinding and baking the electrode sheet includes a drying chamber 1, a circulating pipeline 2, a fresh air pipeline 3, an external exhaust pipeline 4, a supply air pipeline 5, and a heat exchange box 6. The drying chamber 1 performs hot air baking and water removal operations on the continuously running electrode sheet strip. The drying chamber 1 communicates with the circulating pipeline 2, the external exhaust pipeline 4, and the supply air pipeline 5. The circulating pipeline 2 is successively provided with a fresh air section 21, a power section 22, a temperature control section 23, a filtration section 24, and a supply air section 25. The fresh air section 21 communicates with the fresh air pipeline 3. The fresh air pipeline 3 is connected to the external exhaust pipeline 4 through the heat exchange box 6. The fresh air 202 in the fresh air pipeline 3 exchanges heat with the exhaust gas 201 in the external exhaust pipeline 4 at the heat exchange box 6; A circulating fan 26 for pushing the gas to flow in the circulating pipeline 2 is provided in the power section 22. A heating device 27 for heating the gas in the circulating pipeline 2 is provided in the temperature control section 23. A cooling pipeline 7 is connected to the temperature control section 23. An air valve 9 is provided between the cooling pipeline 7 and the temperature control section 23. An air filter element 8 is provided in the filtration section 24. The supply air section 25 communicates with the supply air pipeline 5.

[0033] The air duct pipeline structure for unwinding and baking the electrode sheet in the embodiment of the present application can effectively remove the moisture in the lithium battery electrode sheet and ensure its good drying state, thereby improving the quality and consistency of the battery. A channel for gas to circulate and flow is formed through the circulating pipeline 2 and the drying chamber 1. A part of the gas with water vapor is discharged through the external exhaust pipeline 4, and fresh air is supplemented through the fresh air pipeline 3 and the fresh air section 21 to maintain the air pressure in the drying chamber 1. The fresh air is heated through the heat exchanger to reduce heat loss and energy consumption; The gas is pushed to flow through the power section 22 to ensure that the hot air can take away the moisture on the electrode sheet and the water vapor in the drying chamber 1; The gas is heated through the temperature control section 23 to ensure that the temperature of the hot air gas used for baking the electrode sheet meets the requirements, and the hot gas in the air duct pipeline can be quickly discharged through the cooling pipeline 7 to accelerate the cooling process of the drying chamber 1; The gas is filtered through the filtration section 24 to ensure that the hot air gas for baking the electrode sheet is relatively clean and avoid impurities adhering to the electrode sheet.

[0034] In order to ensure the cleanliness of the fresh air 202 entering the air duct pipeline, in this embodiment, reference Figures 1 to 2, the heat exchange box 6 is provided with a fresh air inlet 104 communicating with the fresh air pipeline 3, and a primary filter element 64 is installed at the fresh air inlet 104.

[0035] It can be understood that with such a setting, the primary filter element 64 can filter substances such as dust, particles, and microorganisms, so that the fresh air 202 entering the fresh air inlet 104 has a high cleanliness, thus avoiding the adhesion of impurities such as dust and particles to the electrode plate during baking and ensuring the quality of the electrode plate.

[0036] In order to keep the primary filter element 64 stably filter the gas, in this embodiment, referring to Figures 1 to 2 , the primary filter element 64 is fixed on the heat exchange box 6 through a fixing frame 65.

[0037] It can be understood that with such a setting, the area of the primary filter element 64 is the same as that of the fresh air inlet 104. The box body of the heat exchange box 6 is a cube, and the fresh air inlet 104 is a square. The square fixing frame 65 is assembled with the square primary filter element 64, and the edge of the fixing frame 65 is fixed to the box body of the heat exchange box 6 by screws. The baffle 66 of the fixing frame 65 can limit the primary filter element 64 to be stably stuck at the fresh air inlet 104 to filter the gas.

[0038] In order to accelerate the cooling process of the drying chamber 1, in this embodiment, referring to Figure 2 , the cooling pipeline 7 is provided with a cooling fan 71.

[0039] It can be understood that with such a setting, when the air valve 9 in the cooling pipeline 7 is opened, the hot gas in the air duct pipeline is discharged through the cooling fan 71. At the same time, the heating equipment, the circulation fan 26, and the fresh air valve 9 are closed to ensure that no fresh air 202 is supplemented, so as to quickly discharge the hot gas and accelerate the cooling process of the drying chamber 1, facilitating shutdown.

[0040] In order to discharge a part of the gas with moisture, in this embodiment, referring to Figure 2 , the external exhaust pipeline 4 is provided with an exhaust fan 41.

[0041] It can be understood that with such a setting, the exhaust fan 41 overcomes the suction of the circulation fan 26, sucks a part of the gas in the drying chamber 1 into the external exhaust pipeline, and discharges the gas, thereby discharging the water vapor in the drying chamber 1 and controlling the water content of the gas in the air duct pipeline to ensure the quality of hot air baking.

[0042] In order to realize the heat exchange between the fresh air 202 and the exhaust gas 201, in this embodiment, referring to Figure 3, a fresh air channel 61 and an exhaust air channel 62 are arranged in the heat exchange box 6. The fresh air channel 61 and the exhaust air channel 62 are respectively communicated with the fresh air pipeline 3 and the external exhaust air pipeline 4. The fresh air channel 61 and the exhaust air channel 62 are separated by a heat exchange medium 63 arranged in layers. The fresh air 202 in the fresh air channel 61 exchanges heat with the exhaust air 201 in the exhaust air channel 62 through the heat exchange medium 63.

[0043] It can be understood that with such an arrangement, the heat exchange core of the heat exchange box 6 is composed of a heat exchange medium 63 that can quickly transfer heat. The heat exchange medium 63 is arranged in layers to form the fresh air channel 61 and the exhaust air channel 62. The exhaust air 201 in the external exhaust air pipeline 4 enters the exhaust air channel 62, transfers heat to the heat exchange medium 63, and the heat exchange medium 63 transfers the heat to the fresh air 202 in the fresh air channel 61, thereby realizing heat exchange and heating the fresh air 202, thus reducing heat loss.

[0044] In order to control the flow rate and flow volume of the gas in the air duct pipeline, in this embodiment, refer to Figure 2 , air valves 9 are arranged in the circulation pipeline 2, the external exhaust air pipeline 4, the fresh air pipeline 3, and the air supply pipeline 5.

[0045] It can be understood that with such an arrangement, the air valves 9 on the circulation pipeline 2 and the external exhaust air pipeline 4 are respectively used to control the return air flowing back and the exhaust air being exhausted, control the ratio between the two, and optimize the drying efficiency. The air valve 9 on the fresh air pipeline 3 is used to control whether to supplement fresh air, and the air valve 9 on the air supply pipeline 5 is used to control the air volume between the upper air chamber 11 and the lower air chamber 12 sent to the drying chamber 1.

[0046] In order to achieve the control of the air volume, in this embodiment, refer to Figure 4 and Figure 5 , the air valve 9 includes a fan blade 91, a mounting frame 92, a rotating rod 93, and an actuator 94. The fan blade 91 is installed on the air flow path through the mounting frame 92. The fan blade 91 is rotatably arranged on the mounting frame 92 through the rotating rod 93. The actuator 94 is in transmission connection with the rotating rod 93 to drive the fan blade 91 to rotate.

[0047] It can be understood that with such an arrangement, the actuator 94 and the rotating rod 93 control the opening and closing angle of the fan blade 91. The opening and closing angle of the fan blade 91 corresponds to different air volumes, so that the fan blade 91 forms a valve, thereby controlling the air volume that can flow through the air valve 9.

[0048] In order to control the opening and closing angle of the fan blade 91, in this embodiment, refer to Figure 2 and Figure 5 , the actuator 94 includes a driving rod 941, a rotating handwheel 942, and a connecting seat 943. The driving rod 941 is in transmission connection with the rotating rod 93 at the connecting seat 943, and the rotating handwheel 942 is installed at the end of the driving rod 941.

[0049] It should be further explained that the mounting frame 92 is provided with two blades 91, and a rotating rod 93 is connected between the two blades 91, and the rotating rod 93 is movably connected to the fixing frame, and a connecting rod 95 is provided between the two blades 91. When one of the rotating rods 93 and the blades 91 is rotated by the actuator 94, the other blade 91 is synchronously rotated through the connecting rod 95, so that the opening and closing angles of the two blades 91 are the same. An indicator plate 944 for the rotation angle of the rotating rod 93 is provided on the connecting seat 943, and a pointer 945 is provided on the rotating rod 93. The rotation angle of the rotating rod 93 and the opening and closing angle of the blade 91 are judged by the position indicated by the pointer 945.

[0050] It can be understood that with such a configuration, the driving rod 941 can be easily rotated by rotating the hand wheel 942. The driving rod 941 and the rotating rod 93 are vertically arranged, and the two are driven by a bevel gear or a worm gear, so that after the driving rod 941 drives the rotating rod 93 and the fan blades 91 to rotate a certain angle, the fan blades 91 can maintain the opening and closing angle unchanged.

[0051] In order to facilitate the replacement of the air filter element 8, in this embodiment, refer to Figure 2 The air filter element 8 is installed in the filter section 24 of the circulation pipeline 2 in a pull-out manner through a supporting plate 81, and a handle 82 is provided on the outside of the supporting plate 81.

[0052] It is understandable that with such a configuration, the air filter element 8 needs to be replaced after being used for a period of time. The handle 82 can be used to quickly pull out the support plate 81 to facilitate the replacement of the air filter element 8. After the air filter element 8 is replaced, the support plate 81 is fixed to the box body of the filter section 24 by multiple screws to prevent the air filter element 8 from detaching from the air duct by itself.

[0053] The working principle of the embodiment of the present application is to unwind the pole sheet material roll of the lithium battery, unwind the pole sheet material strip, and the pole sheet material strip continues to move toward the drying chamber 1. In the drying chamber 1 area, the pole sheet can adopt a U-shaped moving path from the lower air chamber 12 to the upper air chamber 11; the external fresh air 202 passes through the primary filter element 64 for dust removal and then enters the heat exchange box 6, exchanges heat with the exhaust gas 201 in the heat exchange box 6, and then exchanges heat with the circulating return air gas in the fresh air section 21 of the circulation pipeline 2. After mixing, the circulating fan 26 blows the air to the heating device 27 for heating, and the air is filtered through the air filter element 8 in the filter section 24 for dust removal. Then, the air is transported to the upper air chamber 11 and the lower air chamber 12 through two delivery pipelines to bake the electrode in the drying chamber 1 with hot air to remove water. The gas with water vapor enters the external exhaust pipe 4 and the circulation pipe 2 from the exhaust port 102 and the return air port 103 respectively. The hot air in the external exhaust pipe 4 is discharged from the air duct after heat recovery through the heat exchange box 6.

[0054] When the embodiment of this application works normally, it is necessary to open the air valve 9 in the fresh air pipeline 3, the circulation fan 26, the air valve 9 in the air supply pipeline 5 of the upper air chamber 11, the air valve 9 in the air supply pipeline 5 of the lower air chamber 12, the air valve 9 in the external exhaust pipeline 4, the air valve 9 in the circulation pipeline 2, and the exhaust fan 41. The heating device 27 is turned on to work, and the parameters of the heating device 27 are adjusted to the temperature required by the baking process. The moisture in the drying chamber 1 is removed by hot air, effectively removing the moisture in the lithium battery electrode sheet and ensuring its good drying state, thereby improving the quality and consistency of the battery.

[0055] When the embodiment of this application needs to stop for cooling, it is necessary to close the heating device 27, the circulation fan 26, and the air valve 9 in the fresh air pipeline 3, and open the air valve 9 in the cooling pipeline 7 and the cooling fan 71 to discharge the hot air in the equipment, thereby accelerating the cooling process.

[0056] The above does not impose any limitation on the technical scope of the present utility model. Any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. An air duct structure for unwinding and baking pole pieces, characterized in that: It includes a drying chamber, a circulation pipeline, a fresh air pipeline, an external exhaust air pipeline, an air supply pipeline and a heat exchange box. The drying chamber performs hot air baking and dehydration operations on the continuously conveying electrode material strip. The drying chamber is connected with the circulation pipeline, the external exhaust air pipeline and the air supply pipeline. The circulation pipeline is sequentially provided with a fresh air section, a power section, a temperature control section, a filter section and an air supply section. The fresh air section is communicated with the fresh air pipeline, and the fresh air pipeline is connected with the external exhaust air pipeline through a heat exchange box. The fresh air gas of the fresh air pipeline exchanges heat with the exhaust gas of the external exhaust air pipeline at the heat exchange box; the power section is provided with a circulation fan for promoting the flow of gas in the circulation pipeline, the temperature control section is provided with a heating device for heating the gas in the circulation pipeline, the temperature control section is connected with a cooling pipeline, an air valve is provided between the cooling pipeline and the temperature control section, an air filter element is provided in the filter section, and the air supply section is communicated with the air supply pipeline.

2. The air duct structure for unwinding and baking the pole piece according to claim 1, characterized in that: The heat exchange box is provided with a fresh air inlet communicated with the fresh air pipeline, and a primary filter element is installed at the fresh air inlet.

3. The air duct structure for unwinding and baking the pole piece according to claim 2, characterized in that: The primary filter element is fixed on the heat exchange box through a fixing frame.

4. The air duct structure for unwinding and baking the pole piece according to claim 1, characterized in that: The cooling pipeline is provided with a cooling fan.

5. The air duct structure for unwinding and baking the pole piece according to claim 1, characterized in that: The external exhaust air pipeline is provided with an exhaust fan.

6. The air duct structure for unwinding and baking the pole piece according to claim 1, characterized in that: A fresh air channel and an exhaust air channel are arranged in the heat exchange box. The fresh air channel and the exhaust air channel are respectively connected to the fresh air pipeline and the external exhaust air pipeline. The fresh air channel and the exhaust air channel are separated by a layered heat exchange medium. The fresh air gas in the fresh air channel exchanges heat with the exhaust air gas in the exhaust channel through the heat exchange medium.

7. The air duct structure for unwinding and baking the electrode according to claim 1, characterized in that: Air valves are arranged in the circulation pipeline, the external exhaust pipeline, the fresh air pipeline and the air supply pipeline.

8. The air duct structure for unwinding and baking the pole piece according to claim 7, characterized in that: The air valve includes a fan blade, a mounting frame, a rotating rod and an actuator. The fan blade is installed on the air flow path through the mounting frame. The fan blade is rotatably arranged on the mounting frame through the rotating rod. The actuator is transmission-connected to the rotating rod to drive the fan blade to rotate.

9. The air duct structure for unwinding and baking the pole piece according to claim 8, characterized in that: The actuator comprises a driving rod, a rotating hand wheel and a connecting seat. The driving rod is connected to the rotating rod at the connecting seat through transmission, and the rotating hand wheel is installed at the end of the driving rod.

10. The air duct structure for unwinding and baking the electrode according to claim 1, characterized in that: The air filter element is installed in the filter section of the circulation pipeline in a pull-out manner through a supporting plate, and a handle is arranged on the outer side of the supporting plate.

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