A lithium ion battery pole piece baking device and method

Abstract

The present application relates to the technical fields of battery pole piece baking, and discloses a lithium ion battery pole piece baking device and method, the lithium ion battery pole piece baking device includes oven and driving part; the oven is sequentially provided with receiving and releasing part and roll-out module, and the receiving and releasing part is used for clamping and placing the pole piece, the roll-out module is driven to move up and down by the driving part, an open frame is installed in the oven on the side of the roll-out module, an air outlet is formed in the open frame, an extending part is arranged in the open frame, and a docking module is installed on the extending part and is in transmission cooperation with the roll-out module. The present application realizes that the hot air is uniformly blown to the side surface and the bottom of the pole piece by the cooperation of the roll-out module and the receiving and releasing part, the opening and closing of the air outlet are controlled by the extending part, the secondary baking mode is adopted, the problems such as slow heat transfer, uneven distribution and easy generation of micro cracks in the rolled pole piece are effectively solved, the drying effect of the pole piece is improved, and the high-quality production of the lithium ion battery is ensured.

Description

Technical Field

[0001] This invention relates to the field of battery electrode baking technology, and in particular to a lithium-ion battery electrode baking apparatus and method. Background Technology

[0002] Electrodes are one of the core components of lithium-ion batteries. They are mainly composed of active materials, conductive agents, binders, and current collectors. The positive electrode is responsible for the insertion and extraction of lithium ions, while the negative electrode is used for the storage and release of lithium ions. However, moisture is a critical factor that needs to be strictly controlled during the production process of lithium-ion batteries. Excessive moisture can have a serious negative impact on battery performance. First, moisture can cause the decomposition of lithium salts in the electrolyte, generating harmful byproducts and thus affecting the electrochemical stability of the electrolyte. Second, moisture can corrode and damage the positive and negative electrode materials as well as the current collector, altering the surface properties and microstructure of the materials, thereby reducing battery performance. The electrochemical performance of the electrode is affected by several factors. The moisture in the electrode mainly comes from the following aspects: First, the moisture introduced by the raw materials themselves, such as the positive and negative electrode active materials and binders, which absorb environmental moisture during production, transportation and storage. Second, the moisture introduced by the process steps in production, such as stirring and coating, which come into contact with air. Third, the high humidity in the workshop environment causes the electrode to absorb moisture from the air during exposure. At present, the industry mainly uses ovens to bake the electrode. In order to ensure the baking effect and accelerate the baking process, high temperature baking with built-in fans to blow hot air is generally used to evaporate the moisture in the electrode, thereby reducing the moisture content.

[0003] During the baking process of lithium-ion battery electrodes, the electrodes cut into rolls are usually sent into an oven for drying. However, due to the structural characteristics of the rolled electrodes, the heat transfer rate inside them is relatively slow, making it difficult for heat to be evenly distributed to each layer of the electrode. The part near the outer layer of the electrode roll may be dried in a short time, while the inner electrode layers may still contain more moisture. During the baking process, the moisture inside the electrode will be converted into water vapor. However, due to the restricted gas flow, this water vapor is difficult to expel smoothly from the electrode roll, affecting the drying effect of the entire electrode roll.

[0004] To address the aforementioned issues, this application proposes a lithium-ion battery electrode baking apparatus and method. Summary of the Invention

[0005] This invention proposes a lithium-ion battery electrode baking device and method, which solves the problems in related technologies where slow heat transfer, uneven heat distribution, and difficulty in removing internal moisture affect the drying effect when baking lithium-ion battery electrodes in a roll.

[0006] The present invention provides a lithium-ion battery electrode baking device, comprising an oven and a drive unit;

[0007] The oven is equipped with a take-up and release component and a roll-up module in sequence. The take-up and release component is used to hold the electrode sheets. The roll-up module is driven by a drive component to move up and down. An open frame located on one side of the roll-up module is installed in the oven. An exhaust port is provided on the open frame. An extension component is provided in the open frame. A docking module that is driven and cooperates with the roll-up module is installed on the extension component. A heating air supply component is installed on the oven to supply hot air to the open frame and the docking module. An exhaust component is provided at the bottom of the oven for docking the docking module with it.

[0008] When the drive unit moves the unwinding module downwards, it pulls out the electrode sheet on the unwinding component. The extension component moves downwards as well, gradually opening the exhaust port and driving the docking module to dock with the exhaust component. When the unwinding module rotates to wind up the electrode sheet, the docking module drives the exhaust component to move back and forth at the bottom of the unwinding module, blowing hot air toward the electrode sheet.

[0009] As a further optimization of the present invention, the receiving and releasing component includes a first loading cover, which is installed on one side inner wall of the oven. A plurality of spaced expansion shafts are rotatably mounted on the first loading cover. A plurality of rolled pole pieces are sleeved on the expansion shafts. The ends of the plurality of expansion shafts are all equipped with first worm gears located inside the first loading cover. A first motor is installed inside the first loading cover. The output end of the first motor is connected to a first worm, and the first worm is in transmission cooperation with the plurality of first worm gears.

[0010] As a further optimization of the present invention, the unwinding module includes a second loading cover, which is disposed below the first loading cover and is driven to move up and down by a drive member. Multiple rollers are rotatably connected to the second loading cover at intervals. The multiple rollers are respectively located below multiple expansion shafts. The ends of the multiple rollers are each equipped with a second worm gear located inside the second loading cover. A second motor is installed inside the second loading cover. The output end of the second motor is connected to a second worm gear that is respectively engaged with the multiple second worm gears. A shaft is installed at the end of the roller located in the middle near the open frame. A first bevel gear that is engaged with the docking module is installed at the end of the shaft away from the roller. A winding limiting member is fixed on the roller to limit the end of the electrode sheet and to wind it.

[0011] The winding limiting component includes a winding and unwinding drum, which is fixedly mounted on a roller shaft. The winding and unwinding drum has a limiting groove adapted to the electrode sheet, and a limiting block is installed in the limiting groove by a spring.

[0012] As a further optimization of the present invention, the driving component includes a hollow block and a cylinder. The hollow block is installed on one side of the oven. A sliding opening is provided on the side of the hollow block near the oven, and the sliding opening penetrates one side of the oven. A movable block is installed on the second loading cover, which passes through the sliding opening and extends into the hollow block. The movable block is slidably engaged with the sliding opening. The cylinder is installed on the top of the hollow block, and the movable block is connected to the cylinder and driven by the cylinder to move up and down along the sliding opening.

[0013] As a further optimization of the present invention, the extension member includes a loading block and a flexible cover. The loading block is slidably disposed in the open frame, and the flexible cover is connected to the bottom of the loading block. A cavity is opened in the loading block. The end of the shaft away from the roller shaft rotates through the loading block, and the first bevel gear is located in the cavity and is in transmission cooperation with the docking module.

[0014] As a further optimization of the present invention, the docking module includes two air guides, an air passage housing, a reciprocating screw, a second bevel gear, and a limiting rod. Reciprocating screws are rotatably connected to both sides of the loading block. A second bevel gear, located inside the loading block and meshing with the first bevel gear, is installed at an adjacent end of each of the two reciprocating screws. Limiting rods are also fixed to both sides of the loading block. The two air guides are respectively sleeved on the reciprocating screws and limiting rods on both sides of the loading block. The air guides are threadedly engaged with the reciprocating screws and slidably engaged with the limiting rods. The two air guides are used to dock with the exhaust components. The air passage housing is installed at the bottom of the open frame. The bottom of the flexible cover is fixed to the air passage housing. Flexible hoses are connected to both sides of the air passage housing. Two flexible hoses are respectively connected to the two air guides. The air passage housing is connected to the heating air component.

[0015] As a further optimization of the present invention, the air guide component includes a sleeve and an air guide tube. The two sleeves are respectively sleeved on the reciprocating screw and the limiting rod on both sides of the loading block. The sleeves are threadedly engaged with the reciprocating screw and slidably engaged with the limiting rod. An air guide tube is installed at the bottom of each of the two sleeves. The air guide tube is used to connect with the exhaust component. Two flexible hoses are respectively connected to the top ends of the two air guide tubes to deliver hot air into the air guide tubes.

[0016] As a further optimization of the present invention, the exhaust component includes a guide rail, a slider, and an exhaust pipe. The guide rail is installed at the bottom of the oven. Two sliders are slidably fitted on the guide rail. Each slider is equipped with a horizontally arranged exhaust pipe. One end of each exhaust pipe is connected to a connecting pipe. The two connecting pipes are located below the two air guide pipes and are used for inserting the air guide pipes therein. The exhaust pipe has multiple spaced exhaust holes.

[0017] As a further optimization of the present invention, the heating air component includes a hot air blower and an air guide hood. The air guide hood is installed on the other side of the oven and communicates with the open frame. The hot air blower is located on the same side as the air guide hood, and the air outlet end of the hot air blower is connected to an air supply pipe. The end of the air supply pipe away from the hot air blower is connected to a branch pipe. The branch pipe is connected to a first air outlet pipe and a second air outlet pipe. The first air outlet pipe communicates with the air guide hood, and the second air outlet pipe communicates with the air passage housing. Valves are installed on both the first air outlet pipe and the second air outlet pipe.

[0018] A method for baking lithium-ion battery electrodes, using the aforementioned lithium-ion battery electrode baking apparatus, includes the following steps:

[0019] Step 1: Secure the rolled electrode sheet onto the take-up and unwrap unit, and then pull out one end of the electrode sheet and secure it to the take-up and unwrap module.

[0020] Step 2: Drive the winding and unwinding module to move down, and the winding and unwinding component rotates to gradually unfold the electrode. As the winding and unwinding module moves down, it drives the extension component to move down as well, gradually opening the exhaust port on the open frame, and gradually blowing the hot air delivered by the heating air component into the open frame towards the unfolded electrode for gradual preheating.

[0021] Step 3: When the extension component moves down, it drives the docking module to move down as well, so that the two air guides on the docking module are inserted into the connecting pipes of the two exhaust pipes on the exhaust component. At this time, the heating air component will pass hot air into the docking module and into the two exhaust pipes through the two air guides.

[0022] Step 4: The winding and unwinding module rotates to gradually wind the electrode sheet. The take-up and unwinding components also rotate, causing the electrode sheet to gradually unfold. When the winding and unwinding module rotates, it drives the docking module that is in conjunction with it to follow the rotation. This causes the two air guides to move the two exhaust pipes closer to each other or further apart on the guide rail. Hot air is discharged from the exhaust holes on the exhaust pipes and blown evenly to the bottom of the electrode sheet.

[0023] Step 5: Finally, the take-up and unwinding components and the winding and unwinding module rotate simultaneously. The take-up and unwinding components take up the electrode sheet wound on the winding and unwinding module, and the winding and unwinding module gradually unwinds the electrode sheet, so that the electrode sheet is reset and baked a second time. After baking, one end of the electrode sheet is removed from the winding and unwinding module, and then the electrode sheet is removed from the take-up and unwinding components.

[0024] The above-described technical solution of the present invention has the following beneficial technical effects:

[0025] 1. The rolled electrode sheet is fixed on the take-up and unwrap component, and one end is pulled out and fixed on the roll-up and unwrap module. The drive component drives the roll-up and unwrap module to move down. The take-up and unwrap component rotates to unfold the electrode sheet. When the roll-up and unwrap module moves down, the extension component moves down to open the exhaust port on the open frame, so that the hot air delivered by the heating air component gradually blows towards the unfolded electrode sheet, expands the hot air distribution range, and gradually transfers heat to the inside of the electrode sheet. This effectively solves the problem of slow heat transfer and uneven distribution inside the rolled electrode sheet, making the heat transfer inside the electrode sheet more uniform. The outer and inner electrode sheet layers are heated evenly during the baking process, avoiding the situation where the outer layer dries too early while the inside still contains a lot of moisture, thus initially improving the drying effect of the electrode sheet roll.

[0026] 2. By gradually opening the exhaust vents, the surface temperature of the electrode sheet can be prevented from rising rapidly when it is unrolled from a roll to a single layer, thus preventing the temperature gradient problem. This gradually preheats the electrode sheet, reduces the temperature gradient between the surface and the interior, makes the temperature change of the electrode sheet surface and interior more stable, reduces the thermal stress caused by rapid heating, lowers the risk of microcracks or deformation caused by thermal stress on the surface and interior structure of the electrode sheet, and improves the mechanical properties and integrity of the electrode sheet.

[0027] 3. The extension component moves down, causing the docking module to move down, so that the air guide component is inserted into the docking pipe of the exhaust pipe. The hot air supply component passes hot air into the docking module, and then into the exhaust pipe through the air guide component. The winding and unwinding module rotates to wind the electrode sheet, and the take-up and unwinding component rotates to unfold the electrode sheet. At the same time, it drives the docking module to operate, so that the air guide component drives the exhaust pipe to move on the guide rail. Hot air is blown evenly from the exhaust hole to the bottom of the electrode sheet, realizing hot air blowing on the side and bottom at the same time, promoting the evaporation and discharge of moisture at the bottom, and further improving the drying effect of the electrode sheet winding.

[0028] 4. During the recovery process, the take-up and unwinding unit and the winding module rotate simultaneously. The take-up and unwinding unit winds up the electrode sheet wound on the winding module, while the winding module gradually unwinds the electrode sheet, allowing it to return to its original position for a second baking. After baking, one end of the electrode sheet is detached from the winding module, and then the electrode sheet is removed from the take-up and unwinding unit. This second baking method allows for a more thorough drying of the electrode sheet. After the first baking, some of the moisture inside the electrode sheet has already evaporated. The second baking further removes any remaining moisture, ensuring that the dryness of the electrode sheet reaches a higher standard. Ultimately, this maximizes the drying effect of the electrode sheet roll, effectively avoiding problems such as decreased battery performance and shortened lifespan caused by excessive moisture residue inside the electrode sheet. This provides a strong guarantee for the high-quality production of lithium-ion batteries. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a lithium-ion battery electrode baking device and method proposed in this invention.

[0030] Figure 2 This is a schematic diagram of the internal structure of the oven of the present invention;

[0031] Figure 3 For the present invention Figure 2 Overall front view;

[0032] Figure 4 This is an internal cross-sectional view of the oven of the present invention;

[0033] Figure 5 This is a schematic diagram of the cooperative structure of the take-up and untake-down component, the winding and unwinding module, and the driving component of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the receiving and dispensing component of the present invention;

[0035] Figure 7 This is a schematic diagram of the roll-up module of the present invention;

[0036] Figure 8 This is a schematic diagram of the mating structure of the extension component, docking module, exhaust component, and heating air component of the present invention;

[0037] Figure 9 This is a schematic diagram of the mating structure of the extension component, docking module, and heating air component of the present invention;

[0038] Figure 10 This is a schematic diagram of the mating structure between the extension member and the docking module of the present invention;

[0039] Figure 11 This is a schematic diagram of the structure of the exhaust component of the present invention;

[0040] Figure 12 This is a schematic diagram of the heating air component of the present invention.

[0041] Reference numerals: 1. Oven; 101. Open frame; 1011. Vent; 2. Take-up and untake-down component; 21. First loading cover; 22. Expansion shaft; 23. First worm gear; 24. First motor; 25. First worm; 3. Winding and unloading module; 31. Second loading cover; 311. Second motor; 312. Second worm; 313. Moving block; 32. Roller; 321. Second worm gear; 322. Shaft; 323. First bevel gear; 33. Winding limit component; 331. Winding and unloading drum; 332. Limiting groove; 333. Spring; 334. Limiting block; 4. Driving component; 41. Hollow block ; 42. Cylinder; 5. Extension component; 51. Loading block; 52. Flexible cover; 6. Docking module; 61. Air guide component; 611. Sleeve block; 612. Air guide pipe; 62. Air passage shell; 621. Hose; 63. Reciprocating screw; 631. Second bevel gear; 632. Limiting rod; 7. Exhaust component; 71. Guide rail; 72. Slider; 73. Exhaust pipe; 74. Exhaust hole; 75. Connecting pipe; 8. Heating air component; 81. Hot air blower; 811. Air supply pipe; 812. Branch pipe; 813. First air outlet pipe; 814. Second air outlet pipe; 82. Air guide cover; 83. Valve. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0043] like Figure 1-12 As shown, the present invention proposes a lithium-ion battery electrode baking device, which includes an oven 1 and a drive unit 4.

[0044] The oven 1 is provided with a take-up and put-down component 2 and a roll-up and unroll-up module 3 in sequence. The take-up and put-down component 2 is used for holding the electrode sheet. The roll-up and unroll-up module 3 is driven up and down by the drive component 4. An open frame 101 located on one side of the roll-up and unroll-up module 3 is installed in the oven 1. An exhaust port 1011 is opened on the open frame 101. An extension component 5 is provided in the open frame 101. A docking module 6 that is driven and cooperates with the roll-up and unroll-up module 3 is installed on the extension component 5. A hot air supply component 8 is installed on the oven 1 to supply hot air to the open frame 101 and the docking module 6. An exhaust component 7 is provided at the bottom of the oven 1 for docking with the docking module 6.

[0045] When the drive unit 4 drives the winding and unwinding module 3 to move down, it pulls out the electrode sheet on the winding and unwinding component 2. The extension component 5 moves down with it, gradually opening the exhaust port 1011 and driving the docking module 6 to dock with the exhaust component 7. When the winding and unwinding module 3 rotates to wind up the electrode sheet, the docking module 6 drives the exhaust component 7 to move back and forth at the bottom of the winding and unwinding module 3, blowing hot air toward the electrode sheet.

[0046] The rolled electrode sheet is fixed on the take-up and unwrap unit 2, and then one end of the electrode sheet is pulled out and fixed on the roll-up and unwrap module 3. The roll-up and unwrap module 3 is driven to move down by the drive unit 4. The roll-up and unwrap module 3 pulls down the electrode sheet on the take-up and unwrap unit 2 to unfold it. At the same time, the extension unit 5 moves down with the roll-up and unwrap module 3 and gradually opens the exhaust port 1011 on the open frame 101. The hot air from the heating air supply unit 8 blows onto the electrode sheet through the open frame 101. In addition, the extension unit 5 drives the docking module 6 to move down and dock with the exhaust unit 7. When the roll-up and unwrap module 3 rotates to roll up the electrode sheet, the docking module 6 drives the exhaust unit 7 to move back and forth at the bottom of the roll-up and unwrap module 3. The hot air blows from the exhaust unit 7 onto the electrode sheet, realizing the unfolding and winding of the electrode sheet. At the same time, the hot air is blown through the exhaust port 1011 and the exhaust unit 7, so that the hot air gradually covers the electrode sheet, promotes heat transfer, initially improves the drying effect, and avoids the electrode sheet heating up too quickly, which may cause structural problems.

[0047] like Figure 3 , Figure 4 and Figure 6 As shown, in this embodiment, the unloading component 2 includes a first loading cover 21, which is installed on the inner wall of one side of the oven 1. A plurality of spaced expansion shafts 22 are rotatably mounted on the first loading cover 21. A plurality of rolled electrode sheets are sleeved on the expansion shafts 22. The ends of the plurality of expansion shafts 22 are all equipped with first worm gears 23 located inside the first loading cover 21. A first motor 24 is installed inside the first loading cover 21. The output end of the first motor 24 is connected to a first worm 25, and the first worm 25 is in transmission engagement with the plurality of first worm gears 23. After the first motor 24 is started, it drives the first worm 25 to rotate. Since the first worm 25 meshes with the plurality of first worm gears 23, it drives all the expansion shafts 22 to rotate synchronously. When the unloading module 3 pulls down the electrode sheet, the expansion shaft 22 rotates in the forward direction to unwrap the electrode sheet. When it is necessary to rewind, the expansion shaft 22 rotates in the reverse direction to rewind the electrode sheet onto the expansion shaft 22.

[0048] like Figure 4 , Figure 5 and Figure 7As shown, in this embodiment, the unwinding module 3 includes a second loading cover 31, which is disposed below the first loading cover 21 and driven to move up and down by the drive member 4. Multiple spaced rollers 32 are rotatably connected to the second loading cover 31, each located below a multiple expansion shaft 22. Each end of the multiple rollers 32 is equipped with a second worm gear 321 located inside the second loading cover 31. A second motor 311 is installed inside the second loading cover 31, and the output end of the second motor 311 is connected to a drive mechanism that engages with the multiple second worm gears 321. The second worm gear 312 has a shaft 322 installed at one end of the roller shaft 32 near the open frame 101. The shaft 322 is installed at the other end away from the roller shaft 32, which is in transmission cooperation with the docking module 6. A winding limiting member 33 is fixed on the roller shaft 32 to limit the end of the electrode and cause it to be wound. The winding limiting member 33 includes a winding and unwinding drum 331, which is fixedly fitted on the roller shaft 32. A limiting groove 332 adapted to the electrode is opened on the winding and unwinding drum 331. A limiting block 334 is installed in the limiting groove 332 by means of a spring 333.

[0049] The driving component 4 drives the second loading cover 31 to move up and down. The second motor 311 drives the second worm gear 312 to rotate, which in turn drives the roller shaft 32 to rotate through the second worm wheel 321, thereby achieving the winding of the electrode sheet. The winding limiting component 33 on the roller shaft 32 limits the end of the electrode sheet through the spring 333 and the limiting block 334. At the same time, the shaft 322 and the first bevel gear 323 are in transmission cooperation with the docking module 6 to control the winding process of the electrode sheet. The limiting block 334 can adapt to electrode sheets of different thicknesses to ensure that the electrode sheet is wound neatly, and provides power to the docking module 6 through transmission cooperation, so that hot air can be blown evenly onto the electrode sheet.

[0050] like Figure 4 and Figure 5 As shown, in this embodiment, the driving component 4 includes a hollow block 41 and a cylinder 42. The hollow block 41 is installed on one side of the oven 1. A sliding opening is provided on the side of the hollow block 41 near the oven 1, and the sliding opening penetrates one side of the oven 1. A moving block 313 is installed on the second loading cover 31, which passes through the sliding opening and extends into the hollow block 41. The moving block 313 is slidably engaged with the sliding opening. The cylinder 42 is installed on the top of the hollow block 41, and the moving block 313 is connected to the cylinder 42 and driven by the cylinder 42 to move up and down along the sliding opening. The cylinder 42 extends and retracts, causing the moving block 313 to slide up and down in the sliding opening. The moving block 313 is connected to the second loading cover 31, thereby driving the unloading module 3 to move up and down, realizing the stable up and down movement of the unloading module 3, which facilitates the control of the unfolding degree of the electrode sheet and the docking with other components, ensuring the smooth progress of the baking process.

[0051] like Figure 2 , Figure 4 , Figure 8 and Figure 9As shown, in this embodiment, the extension member 5 includes a loading block 51 and a flexible cover 52. The loading block 51 is slidably disposed within the open frame 101, and the flexible cover 52 is connected to the bottom of the loading block 51. A cavity is provided inside the loading block 51. The end of the shaft 322 away from the roller shaft 32 rotates through the loading block 51, and the first bevel gear 323 is located in the cavity and is in transmission cooperation with the docking module 6. When the driving member 4 drives the second loading cover 31 of the roll-up module 3 to move downward, the shaft 322 drives the loading block 51 within the open frame. As the flexible cover 52 slides downward within 101, it is compressed, causing the exhaust vent 1011 to gradually open. The hot air from the heating element 8 is delivered to the open frame 101 and blown from the gradually opening exhaust vent 1011 onto the unfolded electrode sheet to achieve preheating. When the unwinding module 3 moves upward and resets, the shaft 322 drives the loading block 51 to slide upward within the open frame 101. The loading block 51 drives the flexible cover 52 to unfold and reset, covering the exhaust vent 1011 again, stopping the hot air from blowing out of the exhaust vent 1011, and waiting for the next baking cycle.

[0052] like Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, the docking module 6 includes two air guides 61, an air passage housing 62, a reciprocating lead screw 63, a second bevel gear 631, and a limiting rod 632. Reciprocating lead screws 63 are rotatably connected to both sides of the loading block 51. A second bevel gear 631, located inside the loading block 51 and meshing with the first bevel gear 323, is installed at an adjacent end of each of the two reciprocating lead screws 63. Limiting rods 632 are also fixed to both sides of the loading block 51. The two air guides 61 are respectively sleeved on both sides of the loading block 51. On the reciprocating screw 63 and the limiting rod 632, the air guide 61 is threadedly engaged with the reciprocating screw 63 and slidably engaged with the limiting rod 632. The two air guides 61 are used to connect with the exhaust component 7. The air passage housing 62 is installed at the bottom inside the open frame 101. The bottom of the flexible cover 52 is fixed to the air passage housing 62. Both sides of the air passage housing 62 are connected to flexible hoses 621. The two flexible hoses 621 are respectively connected to the two air guides 61. The air passage housing 62 is connected to the heating air component 8.

[0053] When the winding and unwinding module 3 moves downward, it can drive the air guide 61 to insert into the exhaust component 7. When the roller 32 of the winding and unwinding module 3 rotates, the shaft 322 drives the first bevel gear 323 to rotate, meshing with the second bevel gear 631, driving the reciprocating screw 63 to rotate. The air guide 61 moves back and forth along the reciprocating screw 63. The hot air supply component 8 delivers hot air to the air passage housing 62, and then delivers it to the air guide 61 through the hose 621, so that the hot air enters the exhaust component 7. When the two air guides 61 move back and forth, they can drive the exhaust component 7 to move back and forth as well. The hot air is blown to the bottom of the electrode through the exhaust component 7, so as to achieve uniform coverage of the bottom of the electrode by the hot air.

[0054] like Figure 10As shown, in this embodiment, the air guide component 61 includes a sleeve 611 and an air guide tube 612. Two sleeves 611 are respectively sleeved on the reciprocating screw 63 and the limiting rod 632 on both sides of the loading block 51. The sleeves 611 are threadedly engaged with the reciprocating screw 63 and slidably engaged with the limiting rod 632. An air guide tube 612 is installed at the bottom of each of the two sleeves 611. The air guide tube 612 is used to connect with the exhaust component 7. Two flexible hoses 621... It is connected to the top of the two air guide tubes 612 respectively, and is used to deliver hot air into the air guide tubes 612. When the winding module 3 moves down, it can drive the air guide tubes 612 on the sleeve block 611 to move down and be inserted into the exhaust component 7. When the reciprocating screw 63 is running, it can drive the sleeve block 611 to move back and forth, and the exhaust component 7 also moves. Hot air can be blown from the exhaust component 7 to the electrode, ensuring that the hot air can be accurately blown to the bottom of the electrode to promote moisture evaporation.

[0055] like Figure 4 , Figure 8 and Figure 11 As shown, in this embodiment, the exhaust component 7 includes a guide rail 71, a slider 72, and an exhaust pipe 73. The guide rail 71 is installed at the bottom of the oven 1. Two sliders 72 are slidably fitted on the guide rail 71. Each slider 72 is equipped with a horizontally arranged exhaust pipe 73. One end of each exhaust pipe 73 is connected to a connecting pipe 75. The two connecting pipes 75 are located below the two air guide tubes 612, and are used for inserting the air guide tubes 612. The exhaust pipe 73 has multiple spaced exhaust holes 74.

[0056] When the extension member 5 moves the docking module 6 downward, the air guide tube 612 of the air guide member 61 is inserted into the connecting tube 75 of the exhaust pipe 73. At this time, the winding and unwinding module 3 drives the reciprocating screw 63 of the docking module 6 to rotate through the first bevel gear 323. The air guide member 61 moves back and forth on the reciprocating screw 63 and the limiting rod 632, thereby driving the exhaust pipe 73 to slide back and forth synchronously on the guide rail 71 through the slider 72. The hot air from the heating air member 8 enters the air-passing housing 62 through the second air outlet 814, is delivered to the air guide tube 612 through the hose 621, and then enters the exhaust pipe 73 through the connecting tube 75. Finally, it is blown out evenly from the exhaust hole 74 and acts on the bottom of the electrode.

[0057] like Figure 1 , Figure 3 , Figure 8 , Figure 9 and Figure 12As shown, in this embodiment, the heating air component 8 includes a hot air blower 81 and an air guide shroud 82. The air guide shroud 82 is installed on the other side of the oven 1 and communicates with the open frame 101. The hot air blower 81 is located on the same side as the air guide shroud 82, and the air outlet end of the hot air blower 81 is connected to an air supply pipe 811. The end of the air supply pipe 811 away from the hot air blower 81 is connected to a branch pipe 812. The branch pipe 812 is connected to a first air outlet pipe 813 and a second air outlet pipe 814. The first air outlet pipe 813 communicates with the air guide shroud 82, and the second air outlet pipe 814 communicates with the air passage housing 62. Valves 83 are installed on both the first air outlet pipe 813 and the second air outlet pipe 814.

[0058] After the hot air blower 81 is started, it heats the outside air into hot air, which is then delivered to the branch pipe 812 via the supply pipe 811. The hot air is then split into different paths via the first outlet pipe 813 and the second outlet pipe 814. The first outlet pipe 813 delivers the hot air to the open frame 101 via the air guide shroud 82, and then blows it onto the unfolded electrode through the exhaust port 1011 for initial preheating. The second outlet pipe 814 delivers the hot air into the air-passing housing 62, which is then delivered to the air guide component 61 via the hose 621, and finally blown onto the bottom of the electrode through the exhaust component 7 for dynamic baking. The airflow of the first outlet pipe 813 and the second outlet pipe 814 can be independently controlled via the valve 83. During the electrode unfolding and preheating stage, the valve 83 of the first air outlet 813 can be opened to increase the hot air output of the open frame 101 and accelerate surface preheating. During the electrode winding and baking stage, the valve 83 of the second air outlet 814 can be opened to allow more hot air to be blown to the bottom of the electrode through the exhaust component 7, thereby enhancing the evaporation of internal moisture. When the winding and unwinding module 3 moves down, the exhaust port 1011 gradually opens. At this time, the hot air from the first air outlet 813 is blown to the electrode through the open frame 101. After the docking module 6 is docked with the exhaust component 7, the hot air from the second air outlet 814 is dynamically blown through the exhaust component 7. The two work together to achieve the step-by-step operation of preheating and precise baking.

[0059] A method for baking lithium-ion battery electrodes, using the aforementioned lithium-ion battery electrode baking apparatus, includes the following steps:

[0060] Step 1: Place the rolled electrode sheet onto the take-up / unwinder 2 and fix it in place. Then pull out one end of the electrode sheet and fix it onto the take-up / unwinder module 3.

[0061] Step 2: Drive the winding and unwinding module 3 downward by the driving component 4, and the take-up and unwinding component 2 rotates to gradually unfold the electrode sheet. When the winding and unwinding module 3 moves downward, it drives the extension component 5 to move downward as well, gradually opening the exhaust port 1011 on the open frame 101, and gradually blowing the hot air delivered by the heating air component 8 into the open frame 101 towards the unfolded electrode sheet for gradual preheating.

[0062] Step 3: When the extension component 5 moves down, it drives the docking module 6 to move down as well, so that the two air guides 61 on the docking module 6 are respectively inserted into the connecting pipes 75 of the two exhaust pipes 73 on the exhaust component 7. At this time, the heating air component 8 will pass hot air into the docking module 6 and enter the two exhaust pipes 73 through the two air guides 61 respectively.

[0063] Step 4: The winding and unwinding module 3 rotates to gradually wind the electrode sheet. The take-up and unwinding component 2 also rotates, causing the electrode sheet to gradually unfold. When the winding and unwinding module 3 rotates, it drives the docking module 6, which is in conjunction with it, to follow. This causes the two air guides 61 to drive the two exhaust pipes 73 to move closer or further apart on the guide rail 71. Hot air is discharged from the exhaust holes 74 on the exhaust pipes 73 and blown evenly to the bottom of the electrode sheet.

[0064] Step 5: Finally, take-up and unwind components 2 and winding and unwinding modules 3 rotate simultaneously. Take-up and unwind components 2 take up the electrode sheet wound on the winding and unwinding module 3. The winding and unwinding module 3 gradually unwinds the electrode sheet, allowing it to return to its original position for a second baking. After baking, one end of the electrode sheet is removed from the winding and unwinding module 3, and then the electrode sheet is removed from the take-up and unwind components 2.

[0065] The specific working principle of this invention is as follows:

[0066] The rolled electrode sheet is placed on the expansion shaft 22 of the take-up and unwrap unit 2, and then one end of the electrode sheet is inserted into the limiting groove 332 in the take-up and unwrap drum 331. Under the action of the spring 333, the electrode sheet is locked by the limiting block 334. The hot air blower 81 of the hot air supply unit 8 is started. Hot air passes through the air supply pipe 811 and the branch pipe 812. At this time, the valve 83 controls the hot air to not enter in large quantities. The cylinder 42 of the drive unit 4 pushes the moving block 313, causing the second loading cover 31 of the take-up and unwrap module 3 to move down. The roller 32 pulls down the electrode sheet. The first motor 24 of the take-up and unwrap unit 2 drives the first worm gear 25 to rotate, driving the expansion shaft 22 to rotate and unwind. At the same time, the shaft 322 of the take-up and unwrap module 3 drives the loading block 51 of the extension unit 5 to slide down in the open frame 101, gradually opening the exhaust port 1011. Hot air blows from the air guide cover 82 through the open frame 101 to the unfolded electrode sheet for preheating.

[0067] When the loading block 51 slides down, the reciprocating screw 63 of the docking module 6 rotates through the first bevel gear 323 and the second bevel gear 631. The sleeve 611 of the air guide 61 moves on the reciprocating screw 63 and the limiting rod 632. The air guide tube 612 is inserted into the connecting pipe 75 of the exhaust component 7. At this time, the hot air from the heating air component 8 enters the air-passing housing 62 through the second air outlet pipe 814, passes through the hose 621 to the air guide tube 612, and is discharged from the exhaust hole 74 of the exhaust pipe 73. At the same time, the second motor 311 of the winding and unwinding module 3 drives the roller shaft 32 to rotate and wind up the electrode sheet. The rotation of the reciprocating screw 63 causes the air guide 61 to drive the exhaust pipe 73 to move back and forth on the guide rail 71. The hot air is blown evenly to the bottom of the electrode sheet.

[0068] The take-up and unwrap unit 2 and the winding and unwinding module 3 rotate simultaneously. The take-up and unwrap unit 2 winds up the electrode sheet, and the winding and unwinding module 3 unfolds the electrode sheet, so that the electrode sheet is reset and subjected to secondary baking. After baking, the electrode sheet is disassembled and removed from the take-up and unwrap unit 2. Throughout the process, all components work together to achieve the unfolding, winding, and uniform hot air baking of the electrode sheet, solving the problems of slow heat transfer and difficulty in removing moisture inside the rolled electrode sheet, and improving the drying effect.

[0069] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A lithium-ion battery electrode baking apparatus, characterized in that, Includes oven (1) and drive unit (4); The oven (1) is provided with a take-up and release component (2) and a roll-up module (3) in sequence. The rolled electrode sheet is put on the take-up and release component (2) and fixed. The roll-up module (3) is driven up and down by the drive component (4). The oven (1) is provided with an open frame (101) located on the side of the roll-up module (3) away from the drive component (4). An exhaust port (1011) is provided on the open frame (101). An extension component (5) is provided in the open frame (101). A docking module (6) that is driven and cooperates with the roll-up module (3) is installed on the extension component (5). A heating air supply component (8) that supplies hot air to the open frame (101) and the docking module (6) is installed on the oven (1). An exhaust component (7) is provided at the bottom of the oven (1). When the drive unit (4) drives the winding module (3) to move down, it pulls out the electrode sheet on the winding unit (2), and the extension unit (5) moves down accordingly, gradually opening the exhaust port (1011) and driving the docking module (6) to dock with the exhaust unit (7). When the winding module (3) rotates to wind up the electrode sheet, the docking module (6) drives the exhaust unit (7) to move back and forth at the bottom of the winding module (3) to blow hot air toward the electrode sheet.

2. The lithium-ion battery electrode baking apparatus according to claim 1, characterized in that, The loading and unloading component (2) includes a first loading cover (21), which is installed on the inner wall of one side of the oven (1). Multiple expansion shafts (22) are rotatably mounted on the first loading cover (21). Multiple rolled pole pieces are sleeved on the expansion shafts (22). The ends of the multiple expansion shafts (22) are all equipped with first worm gears (23) located inside the first loading cover (21). A first motor (24) is installed inside the first loading cover (21). The output end of the first motor (24) is connected to a first worm (25), and the first worm (25) is in transmission cooperation with the multiple first worm gears (23).

3. The lithium-ion battery electrode baking apparatus according to claim 2, characterized in that, The unwinding module (3) includes a second loading cover (31), which is located below the first loading cover (21) and is driven to move up and down by a drive unit (4). Multiple spaced rollers (32) are rotatably connected to the second loading cover (31). The multiple rollers (32) are located below multiple expansion shafts (22), and each end of the multiple rollers (32) is equipped with a second worm gear (321) located inside the second loading cover (31). A second worm gear (321) is installed inside the second loading cover (31). The output end of the second motor (311) is connected to a second worm (312) that is respectively driven by a plurality of second worm gears (321). A shaft (322) is installed at one end of the roller shaft (32) located in the middle, near the open frame (101). A first bevel gear (323) that is driven by the docking module (6) is installed at the other end of the shaft (322). A winding limiting member (33) is fixed on the roller shaft (32) to limit the end of the electrode sheet and to make it wind. The winding limiting component (33) includes a winding and unwinding drum (331), which is fixedly mounted on the roller (32). The winding and unwinding drum (331) has a limiting groove (332) adapted to the electrode sheet, and a limiting block (334) is installed in the limiting groove (332) by a spring (333).

4. The lithium-ion battery electrode baking apparatus according to claim 3, characterized in that, The driving component (4) includes a hollow block (41) and a cylinder (42). The hollow block (41) is installed on one side of the oven (1). The hollow block (41) has a sliding opening on the side near the oven (1) and the sliding opening passes through one side of the oven (1). A moving block (313) is installed on the second loading cover (31) that passes through the sliding opening and extends into the hollow block (41). The moving block (313) slides with the sliding opening. The cylinder (42) is installed on the top of the hollow block (41). The moving block (313) is connected to the cylinder (42) and is driven by the cylinder (42) to move up and down along the sliding opening.

5. A lithium-ion battery electrode baking apparatus according to claim 3, characterized in that, The extension member (5) includes a loading block (51) and a flexible cover (52). The loading block (51) is slidably disposed in the open frame (101), and the flexible cover (52) is connected to the bottom of the loading block (51). A cavity is provided in the loading block (51). The end of the shaft (322) away from the roller shaft (32) rotates through the loading block (51), and the first bevel gear (323) is located in the cavity and is in transmission cooperation with the docking module (6).

6. The lithium-ion battery electrode baking apparatus according to claim 5, characterized in that, The docking module (6) includes two air guides (61), an air vent housing (62), a reciprocating screw (63), a second bevel gear (631), and a limiting rod (632). Reciprocating screws (63) are rotatably connected to both sides of the loading block (51). A second bevel gear (631) located inside the loading block (51) and meshing with the first bevel gear (323) is installed at one adjacent end of each of the two reciprocating screws (63). Limiting rods (632) are also fixed to both sides of the loading block (51). The two air guides (61) are respectively sleeved on the reciprocating screws (63) on both sides of the loading block (51). On the limiting rod (632), the air guide (61) is threadedly engaged with the reciprocating screw (63), and the air guide (61) is slidably engaged with the limiting rod (632). The two air guides (61) are used to connect with the exhaust component (7). The air passage housing (62) is installed at the bottom inside the open frame (101). The bottom of the flexible cover (52) is fixed to the air passage housing (62). Both sides of the air passage housing (62) are connected to flexible hoses (621). The two flexible hoses (621) are connected to the two air guides (61) respectively. The air passage housing (62) is connected to the heating air component (8).

7. A lithium-ion battery electrode baking apparatus according to claim 6, characterized in that, The air guide component (61) includes a sleeve (611) and an air guide tube (612). The two sleeves (611) are respectively sleeved on the reciprocating screw (63) and the limiting rod (632) on both sides of the loading block (51). The sleeve (611) is threadedly engaged with the reciprocating screw (63) and the sleeve (611) is slidably engaged with the limiting rod (632). The bottom of each of the two sleeves (611) is equipped with an air guide tube (612). The air guide tube (612) is used to connect with the exhaust component (7). Two hoses (621) are respectively connected to the top of the two air guide tubes (612) to deliver hot air into the air guide tubes (612).

8. The lithium-ion battery electrode baking apparatus according to claim 7, characterized in that, The exhaust component (7) includes a guide rail (71), a slider (72), and an exhaust pipe (73). The guide rail (71) is installed at the bottom of the oven (1). Two sliders (72) slide on the guide rail (71). Each slider (72) is equipped with a horizontally arranged exhaust pipe (73). One end of each exhaust pipe (73) is connected to a connecting pipe (75). The two connecting pipes (75) are located below the two air guide tubes (612) and are used for inserting the air guide tubes (612) into them. The exhaust pipe (73) has multiple exhaust holes (74) arranged at intervals.

9. A lithium-ion battery electrode baking apparatus according to claim 6, characterized in that, The heating air component (8) includes a hot air blower (81) and an air guide hood (82). The air guide hood (82) is installed on the other side of the oven (1) and communicates with the open frame (101). The hot air blower (81) is located on the same side as the air guide hood (82), and the air outlet end of the hot air blower (81) is connected to an air supply pipe (811). The end of the air supply pipe (811) away from the hot air blower (81) is connected to a branch pipe (812). The branch pipe (812) is connected to a first air outlet pipe (813) and a second air outlet pipe (814). The first air outlet pipe (813) communicates with the air guide hood (82), and the second air outlet pipe (814) communicates with the air passage housing (62). Valves (83) are installed on both the first air outlet pipe (813) and the second air outlet pipe (814).

10. A method for baking lithium-ion battery electrodes, using a lithium-ion battery electrode baking apparatus as described in any one of claims 8-9, characterized in that, Includes the following steps: Step 1: Place the rolled electrode sheet onto the take-up and unwrap unit (2) and fix it in place. Then pull out one end of the electrode sheet and fix it onto the take-up and unwrap module (3). Step 2: Drive the winding module (3) downward by the drive component (4), and the winding component (2) rotates to gradually unfold the electrode. When the winding module (3) moves downward, it drives the extension component (5) to follow and gradually open the exhaust port (1011) on the open frame (101). The hot air delivered by the heating air component (8) to the open frame (101) is gradually blown towards the unfolded electrode for gradual preheating. Step 3: When the extension component (5) moves down, it drives the docking module (6) to move down as well, so that the two air guides (61) on the docking module (6) are inserted into the connecting pipes (75) of the two exhaust pipes (73) on the exhaust component (7). At this time, the heating air component (8) sends hot air into the docking module (6) and into the two exhaust pipes (73) through the two air guides (61). Step 4: The winding and unwinding module (3) rotates to gradually wind the electrode sheet. The winding and unwinding component (2) also rotates, causing the electrode sheet to gradually unfold. When the winding and unwinding module (3) rotates, it drives the docking module (6) that is connected to it to follow the rotation. This causes the two air guides (61) to drive the two exhaust pipes (73) to move closer or further apart on the guide rail (71). Hot air is discharged from the exhaust holes (74) on the exhaust pipes (73) and blown evenly to the bottom of the electrode sheet. Step 5: Finally, the take-up and unwinding component (2) and the winding and unwinding module (3) rotate simultaneously. The take-up and unwinding component (2) winds up the electrode sheet wound on the winding and unwinding module (3). The winding and unwinding module (3) gradually unwinds the electrode sheet, so that the electrode sheet is reset and baked a second time. After baking, one end of the electrode sheet is removed from the winding and unwinding module (3), and then the electrode sheet is removed from the take-up and unwinding component (2).

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