Centralized heating device for positive pole piece
By using the positive electrode plate centralized heating device to heat and stretch the electrode ears during the production process of the positive electrode plate of the lithium battery, the problem of the electrode segment belt in the roller pressing process is solved, and product quality and production safety are improved.
Patent Information
- Application Number
- CN202420957752.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In the production process of the positive electrode sheet of lithium battery, the rolling process leads to a different extension between the electrode ear and the coating width material area, which easily leads to the electrode segment belt and affects the production quality.
A positive electrode piece concentrated heating device is designed, and the electrode ears are heated using an IHA heating head, and the heating concentration is increased through the shielding block, and the electrode ears are stretched in combination with the main roller and the tension system.
Through heating and stretching treatment, the probability of the positive electrode sheet breaking the belt during the rolling process is reduced, and the structural safety and production quality of the product are improved.
Smart Images
Figure CN222462938U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of lithium battery production, and in particular to a centralized heating device for positive electrode plates. Background Art
[0002] The positive electrode sheet, also known as the positive electrode sheet, is one of the key components in lithium-ion batteries. It is usually composed of the positive electrode material of lithium-ion batteries, has good electrical conductivity and electrochemical activity, and plays an important role in storing and releasing lithium ions during the charge and discharge process of lithium batteries. The positive electrode sheet includes three parallel pole ears and a coating width set between the adjacent pole ears on both sides. In the production process of the positive electrode sheet, a rolling process is required. After the positive electrode sheet is rolled, the middle pole ear and the coating width material area are extended greatly, while the pole ears on both sides are not extended. The difference in extension between the two makes it easy for the positive electrode sheet to break during rolling, which affects the production quality of the positive electrode sheet, so it needs to be improved. Utility Model Content
[0003] In order to reduce the probability of positive electrode sheets being broken and protect the product quality of the positive electrode sheets, the present application provides a centralized heating device for positive electrode sheets.
[0004] The present application provides a positive electrode plate centralized heating device adopts the following technical solution:
[0005] A centralized heating device for positive electrode sheets comprises a workbench, the surface of the workbench is provided with a conveyor belt for transporting positive electrode sheets, a mounting frame is provided above the workbench, two heating heads for heating positive electrode sheets are provided on the mounting frame, each of the heating heads corresponds to a pole ear portion on the side of a positive electrode sheet, a shielding block is provided at the bottom of the heating head, and the shielding block is located above the corresponding pole ear portion.
[0006] By adopting the above technical solution, the IHA heating head is used to heat the ear part of the positive electrode sheet between rolling, so that the subsequent positive electrode sheet can be better extended when passing through the pressure roller. The setting of the shielding block can further improve the concentration of heating on the ear part. Since the ear part is made of foil, it has high thermal conductivity and cooperates with the shielding block, so that the temperature of the ear part can be increased faster, thereby reducing the probability of broken belt of the positive electrode sheet and ensuring the structural safety and production quality of the product.
[0007] Optionally, a main roller is further arranged above the workbench, the heating head and the main roller are arranged in sequence along the moving direction of the conveyor belt, two sets of tension systems are arranged on the surface of the workbench, and the main roller is located between the tension systems on both sides.
[0008] By adopting the above technical solution, after being heated by the heating head, the positive electrode sheet continues to move on the conveyor belt. Under the action of the main roller pressure and tension system, the ear part will be stretched, further reducing the probability of belt breakage.
[0009] Optionally, two adjustment grooves are provided on the surface of the workbench, and the length directions of the adjustment grooves are perpendicular to the length direction of the conveyor belt. The positive electrode sheet is located between the adjustment grooves on both sides, and an adjustment column is slidably connected in each of the adjustment grooves. A guide bar is provided at one end of the adjustment column extending out of the adjustment groove, and the guide bar is parallel to the positive electrode sheet. An adjustment cavity is provided in the workbench, and the two adjustment grooves are connected to the adjustment cavity. An adjustment component for driving the adjustment column to move is provided in the adjustment cavity.
[0010] By adopting the above technical solution and setting adjustment grooves and guide strips, it is possible to ensure that the positive electrode plate moves in a direction parallel to the conveyor belt, thereby ensuring that the pole ear can be located below the shielding block, making the heating effect more stable and concentrated, improving product quality, and reducing the probability of belt breakage.
[0011] Optionally, the adjustment assembly includes two fixed seats, an adjusting screw, a driving motor, a limit rod and two connecting plates, and the connecting plates and the adjusting columns correspond to each other one by one; the two fixed seats are both arranged on the bottom wall of the adjusting cavity, and the two fixed seats are distributed along the length direction of the adjusting groove, the adjusting screw is rotatably connected between the fixed seats on both sides, the driving motor is connected to one of the side walls of the fixed seats, and the output shaft of the driving motor is connected to the adjusting screw, the limit rod is arranged between the fixed seats on both sides, the limit rod is parallel to the adjusting screw, and the connecting plate is connected to the bottom wall of the corresponding adjusting column, the two connecting plates are both threadedly connected to the surrounding wall of the adjusting screw, the adjusting screw includes threaded sections with opposite thread rotation directions at both ends, each of the threaded sections corresponds to a connecting plate, and the limit rod passes through the two connecting plates in sequence.
[0012] By adopting the above technical solution, the driving motor is started, driving the adjusting screw to rotate. With the cooperation of the threaded section and the corresponding connecting piece, the two connecting pieces can move towards each other or away from each other, thereby synchronously adjusting the guide strips on both sides. The structure is simple, easy to implement, and has high practicality.
[0013] Optionally, inner walls of the two adjustment grooves on a side away from each other are both provided with a clearance groove, a shielding plate is slidably connected in the clearance groove, and the adjustment column passes through the shielding plate and extends out of one end of the clearance groove.
[0014] By adopting the above technical solution, when the adjustment column moves, it will drive the shielding plate to move together, thereby shielding part of the opening of the adjustment slot to reduce the entry of impurities such as dust, protect the structural safety of the internal adjustment components, and extend the service life.
[0015] Optionally, a lifting mechanism is provided on the mounting frame, and the lifting mechanism is connected to the heating head to drive the heating head to move up and down.
[0016] By adopting the above technical solution, the lifting mechanism is provided to flexibly adjust the height of the heating head, thereby playing a role in better controlling the heating efficiency of the pole ear part and improving the safety in production operations.
[0017] Optionally, a temperature sensing unit is provided on the side wall of the shielding block.
[0018] By adopting the above technical solution, a temperature sensing unit is set up to detect the temperature of the shielding block in real time, so that the staff can turn off the heating head when the temperature of the shielding block is too high to prevent the melting of the pole ear due to excessive temperature, thereby protecting the structural safety of the positive electrode plate and improving the safety of the production process.
[0019] Optionally, a wind knife assembly is provided on the mounting frame, and the wind knife assembly is located on a side of the heating head away from the main roller.
[0020] By adopting the above technical solution, a wind knife assembly is provided to remove dust and impurities on the surface of the pole ear before heating the pole ear, thereby ensuring the cleanliness of the pole ear surface and preventing impurities from adhering to the pole ear surface after heating and being difficult to remove.
[0021] In summary, the present application includes at least one of the following beneficial technical effects:
[0022] 1. Use the IHA heating head to heat the ear of the positive electrode sheet during rolling, so that the subsequent positive electrode sheet can be well extended when passing through the roller. The setting of the shielding block can further improve the concentration of heating on the ear. Since the ear is made of foil, it has high thermal conductivity and cooperates with the shielding block to increase the temperature of the ear faster, thereby reducing the probability of the positive electrode sheet breaking and ensuring the structural safety and production quality of the product.
[0023] 2. After being heated by the heating head, the positive electrode sheet continues to move on the conveyor belt. Under the action of the main roller pressure and tension system, the ear part will be stretched, further reducing the probability of belt breakage. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural schematic diagram of a positive electrode plate centralized heating device in an embodiment of the present application.
[0025] Figure 2 It is a cross-sectional view of the workbench in the embodiment of the present application.
[0026] Explanation of the reference numerals: 1. Positive electrode plate; 11. Ear portion; 12. Coating width; 2. Workbench; 21. Conveyor belt; 22. Adjustment slot; 23. Adjustment chamber; 24. Give way slot; 25. Shielding plate; 3. Mounting frame; 31. Lifting mechanism; 32. Wind knife assembly; 4. Heating head; 41. Shielding block; 42. Temperature sensing unit; 5. Main roller; 6. Tension system; 7. Adjustment column; 71. Guide strip; 8. Adjustment assembly; 81. Fixed seat; 82. Adjustment screw; 83. Drive motor; 84. Limit rod; 85. Connecting piece. DETAILED DESCRIPTION
[0027] The following is combined with Figure 1-2 This application is described in further detail.
[0028] The present application embodiment discloses a positive electrode plate centralized heating device. Figure 1 and Figure 2 The positive electrode sheet 1 includes three ear parts 11 arranged parallel to each other, a coating width 12 is arranged between two adjacent ear parts 11, and the ear parts 11 and the coating width 12 together constitute the positive electrode sheet 1; the device of the present application includes a workbench 2, the surface of the workbench 2 is rotatably connected with a conveyor belt 21 for transmitting the positive electrode sheet 1, two adjustment grooves 22 are opened on the surface of the workbench 2, the conveyor belt 21 is located between the two adjustment grooves 22, the length direction of the adjustment groove 22 is perpendicular to the length direction of the conveyor belt 21, and an adjustment column 7 is slidably connected in each adjustment groove 22, and one end of the adjustment column 7 extending out of the adjustment groove 22 is connected to a guide bar 71 by welding, and the guide bar 71 is arranged parallel to the conveyor belt 21, and the guide bar 71 is used to abut against the ear part 11 at the edge of the positive electrode sheet 1 to ensure that the positive electrode sheet 1 can move in a straight line direction.
[0029] Reference Figure 1 and Figure 2 An adjustment cavity 23 is provided inside the workbench 2, and the two adjustment grooves 22 are both connected to the adjustment cavity 23. An adjustment component 8 is provided in the adjustment cavity 23 to drive the adjustment column 7 and the guide strip 71 to move. The adjustment component 8 includes two fixed seats 81, an adjustment screw rod 82, a drive motor 83, a limit rod 84 and two connecting pieces 85, wherein the connecting pieces 85 and the adjustment columns 7 are provided in a one-to-one correspondence.
[0030] Reference Figure 1 and Figure 2, the two fixing blocks are connected to the bottom wall of the adjusting cavity 23 by welding, and the two fixing blocks are distributed along the length direction of the adjusting groove 22. The adjusting screw 82 is rotatably connected between the fixing blocks on both sides, and the driving motor 83 is detachably connected to the side wall of the fixing seat 81 on one side by bolts, and its output shaft is connected to the adjusting screw 82 by key connection to drive the adjusting screw 82 to rotate; the connecting piece 85 is connected to the bottom end of the corresponding adjusting column 7, and the adjusting screw 82 is divided into two threaded sections with opposite thread rotation directions from the center section, and each threaded section is opposite to the adjusting screw 82. There should be a connecting piece 85, and the two connecting pieces 85 are respectively threadedly connected to the outer walls of the corresponding threaded sections. The limiting rod 84 is connected between the fixing seats 81 on both sides by welding. The limiting rod 84 is arranged in parallel with the adjusting screw rod 82, and the limiting rod 84 passes through the two connecting pieces 85 in sequence. Under the joint action of the adjusting screw rod 82 and the limiting rod 84, when the driving motor 83 is started, it can drive the two adjusting columns 7 and the corresponding guide strips 71 to move in the direction of approaching or moving away from each other, thereby positioning and guiding the positive electrode plates 1 of different widths.
[0031] Reference Figure 1 and Figure 2 A clearance groove 24 is provided on the inner wall of the two adjustment grooves 22 which are away from each other, and a shielding plate 25 is slidably connected in the clearance groove 24. The length of the shielding plate 25 is greater than the length of the adjustment groove 22. One end of the shielding plate 25 extends out of the clearance groove 24. The adjustment column 7 passes through the corresponding shielding plate 25 and is inserted into the adjustment cavity 23. When the adjustment column 7 moves, it can drive the shielding plate 25 to slide in the corresponding direction, thereby blocking part of the opening of the adjustment groove 22, reducing the entry of dust, maintaining the normal operation of the internal adjustment component 8, and reducing the maintenance frequency.
[0032] Reference Figure 1 and Figure 2A mounting frame 3 is arranged above the workbench 2, and a wind knife assembly 32 is arranged on the mounting frame 3. The wind knife assembly 32 is arranged in the direction of the positive electrode sheet 1 to blow away the dust on the surface of the positive electrode sheet 1 and keep the surface of the positive electrode sheet 1 clean; a lifting mechanism 31 is also arranged on the mounting frame 3. In this embodiment, the lifting mechanism 31 can adopt a cylinder, and two IHA heating heads 4 are connected to the lifting mechanism 31. Each heating head 4 corresponds to the pole ear 11 on one side of the positive electrode sheet 1, so as to heat the connection between the pole ear 11 and the coating width 12, so as to achieve a better extension effect during the subsequent rolling; each A shielding block 41 is provided at the bottom of each heating head 4 for heat conduction, so as to improve the heating concentration of the pole ear 11 and prevent heat diffusion, so that the pole ear 11 can heat up quickly; a temperature sensing unit 42 is provided on the side wall of each shielding block 41, and the temperature sensing unit 42 can adopt a temperature sensor to detect the surface temperature of the shielding block 41 in real time. The temperature sensing unit 42 is communicatively connected with the control system of the device to send the detection value to the control system in real time. When the detected temperature value exceeds a preset value (such as 100°C), the heating head 4 is turned off to prevent the positive electrode plate 1 from melting due to excessive temperature and causing safety hazards.
[0033] Reference Figure 1 and Figure 2 A main roller 5 is also arranged above the workbench 2. The wind knife assembly 32, the heating head 4 and the main roller 5 are arranged in sequence along the moving direction of the conveyor belt 21. A tension system 6 is arranged on both sides of the main roller 5. In this embodiment, the tension system 6 includes two tension rollers. The positive electrode sheet 1 is stretched by the tension rollers. Under the action of the main roller 5 and the tension system 6, the positive electrode sheet 1 is further stretched to reduce the risk of belt breakage when the positive electrode sheet 1 is subsequently rolled.
[0034] The implementation principle of a concentrated heating device for positive electrode sheets in an embodiment of the present application is as follows: the wind knife assembly 32 blows away the dust on the surface of the positive electrode sheet 1, and the IHA heating head 4 is used to heat the ear portion 11 of the positive electrode sheet 1 between roller pressing, so that the subsequent positive electrode sheet 1 can be better extended when passing through the pressing roller. The setting of the shielding block 41 can further improve the concentration of heating on the ear portion 11. Since the ear portion 11 is made of foil, it has high thermal conductivity and cooperates with the shielding block 41, so that the temperature of the ear portion 11 can be increased faster. After being heated by the heating head 4, the positive electrode sheet 1 continues to move on the conveyor belt 21. Under the pressure of the main roller 5 and the tension system 6, the ear portion 11 will be stretched, further reducing the probability of belt breakage.
[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A centralized heating device for positive electrode sheets, characterized in that: The invention comprises a workbench (2), wherein a conveyor belt (21) for transporting a positive electrode sheet (1) is arranged on the surface of the workbench (2), a mounting frame (3) is arranged above the workbench (2), and two heating heads (4) for heating the positive electrode sheet (1) are arranged on the mounting frame (3), each of the heating heads (4) corresponds to a pole ear (11) on the side of the positive electrode sheet (1), and a shielding block (41) is arranged at the bottom of the heating head (4), and the shielding block (41) is located above the corresponding pole ear (11).
2. A concentrated heating device for positive electrode sheets according to claim 1, characterized in that: A main roller (5) is also arranged above the workbench (2), and the heating head (4) and the main roller (5) are arranged in sequence along the moving direction of the conveyor belt (21). Two sets of tension systems (6) are arranged on the surface of the workbench (2), and the main roller (5) is located between the tension systems (6) on both sides.
3. A concentrated heating device for positive electrode sheets according to claim 1, characterized in that: The workbench (2) is provided with two adjustment grooves (22) on its surface, the length direction of the adjustment grooves (22) being perpendicular to the length direction of the conveyor belt (21), the positive electrode sheet (1) being located between the adjustment grooves (22) on both sides, each of the adjustment grooves (22) being slidably connected with an adjustment column (7), one end of the adjustment column (7) extending out of the adjustment groove (22) being provided with a guide bar (71), the guide bar (71) being parallel to the positive electrode sheet (1), the workbench (2) being provided with an adjustment cavity (23), the two adjustment grooves (22) being connected to the adjustment cavity (23), the adjustment cavity (23) being provided with an adjustment component (8) for driving the adjustment column (7) to move.
4. A concentrated heating device for positive electrode sheets according to claim 3, characterized in that: The adjustment assembly (8) comprises two fixed seats (81), an adjustment screw rod (82), a drive motor (83), a limit rod (84) and two connecting pieces (85), wherein the connecting pieces (85) correspond to the adjustment columns (7) in a one-to-one manner; the two fixed seats (81) are both arranged on the bottom wall of the adjustment cavity (23), the two fixed seats (81) are distributed along the length direction of the adjustment slot (22), the adjustment screw rod (82) is rotatably connected between the fixed seats (81) on both sides, the drive motor (83) is connected to the side wall of one of the fixed seats (81), and the drive motor (83) is connected to the side wall of one of the fixed seats (81). The output shaft of the motor (83) is connected to the adjusting screw (82), the limiting rod (84) is arranged between the fixing seats (81) on both sides, the limiting rod (84) is parallel to the adjusting screw (82), the connecting piece (85) is connected to the bottom wall of the corresponding adjusting column (7), the two connecting pieces (85) are both threadedly connected to the peripheral wall of the adjusting screw (82), the adjusting screw (82) includes threaded sections with opposite thread rotation directions at both ends, each of the threaded sections corresponds to a connecting piece (85), and the limiting rod (84) passes through the two connecting pieces (85) in sequence.
5. The positive electrode concentrated heating device according to claim 3, characterized in that: The inner walls of the two adjustment grooves (22) on the side away from each other are both provided with a clearance groove (24), a shielding plate (25) is slidably connected in the clearance groove (24), and the adjustment column (7) passes through the shielding plate (25) and extends out of one end of the clearance groove (24).
6. A concentrated heating device for positive electrode sheets according to claim 1, characterized in that: The mounting frame (3) is provided with a lifting mechanism (31), and the lifting mechanism (31) is connected to the heating head (4) so as to drive the heating head (4) to move up and down.
7. The positive electrode concentrated heating device according to claim 1, characterized in that: A temperature sensing unit (42) is provided on the side wall of the shielding block (41).
8. The positive electrode concentrated heating device according to claim 1, characterized in that: The mounting frame (3) is provided with a wind knife assembly (32), and the wind knife assembly (32) is located on a side of the heating head (4) away from the main roller (5).