Battery sintering furnace and battery sintering system
By combining low-temperature sintering and laser high-temperature sintering technologies in a battery sintering furnace, the problem that traditional processes cannot take into account both the P and N zones sintering temperatures are solved, and the simultaneous sintering of the battery cells is achieved, which improves production efficiency and battery performance.
Patent Information
- Application Number
- CN202422185825.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The traditional wire mesh sintering process cannot take into account the sintering temperatures of the battery zone P and N zones at the same time, which affects the battery production and preparation efficiency.
A battery sintering furnace is designed, including a sintering furnace body and a laser irradiation system. The sintering furnace body is used for low-temperature sintering, and the laser irradiation system is used for selective high-temperature sintering, and the simultaneous sintering of P and N zones is achieved through the heat generated by the laser.
The sintering of the P and N regions of the battery cells is achieved simultaneously, which improves the battery production and preparation efficiency, ensures that each zone achieves the best metallization effect, and improves the battery performance and efficiency.
Smart Images
Figure CN222993469U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery preparation, in particular to a battery sintering furnace and a battery sintering system. Background Art
[0002] The sintering temperature difference between the P region and the N region of the battery is large, and the traditional screen sintering process cannot take into account the sintering temperatures of both the P region and the N region at the same time, which affects the production and preparation efficiency of the battery. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a battery sintering furnace and a battery sintering system, which can sinter the P region and the N region of the battery at the same time, and improve the production and preparation efficiency of the battery.
[0004] In a first aspect, an embodiment of the utility model provides a battery sintering furnace, which includes a sintering furnace main body and a laser irradiation system. The sintering furnace main body is used for low-temperature sintering, and a window is opened thereon; the laser irradiation system is used for selective area high-temperature sintering, and is arranged outside the sintering furnace main body. The laser irradiation system includes a laser and a high-speed galvanometer scanning system. The laser is used for emitting a laser beam, and the high-speed galvanometer scanning system is used for controlling the deflection of the laser beam. The output end of the high-speed galvanometer scanning system is arranged corresponding to the window.
[0005] In a second aspect, an embodiment of the utility model further provides a battery sintering system, which includes a conveying mechanism and the above-mentioned battery sintering furnace. The conveying mechanism is used for carrying and conveying battery wafers, and the conveying mechanism passes through the sintering furnace main body.
[0006] The beneficial technical effects of the utility model are as follows: the battery sintering furnace of the utility model is provided with a window on the sintering furnace main body for low-temperature sintering, and a laser irradiation system for selective area high-temperature sintering is arranged outside the sintering furnace main body corresponding to the window, so that selective area laser irradiation can be carried out by using the laser irradiation system while low-temperature sintering is carried out, and high-temperature sintering is carried out by using the heat generated by the laser, thereby realizing the sintering of the P region and the N region of the battery wafer at the same time, improving the production and preparation efficiency of the battery, and ensuring the best metallization effect of each region through temperature-division sintering. Moreover, the laser irradiation system includes a laser and a high-speed galvanometer scanning system, and the high-speed galvanometer scanning system accurately irradiates the selective area of the laser beam emitted by the laser, ensuring the position where the laser acts, improving the processing accuracy and efficiency, enabling a good ohmic contact to be formed in the metallized region of the N region of the battery wafer, laying a solid foundation for further improving the photoelectric conversion efficiency, and being beneficial to improving the battery performance and efficiency. The battery sintering system of the utility model also has the above functions and has strong practicability. Description of the Drawings
[0007] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0008] Figure 1 It is a schematic structural diagram of a battery sintering furnace provided by an embodiment of the present utility model;
[0009] Figure 2 It is a schematic structural diagram of a battery sintering system provided by an embodiment of the present utility model. Specific embodiments
[0010] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.
[0011] Please refer to Figure 1 , Figure 1 It is a schematic structural diagram of a battery sintering furnace provided by an embodiment of the present utility model. The battery sintering furnace 10 includes a sintering furnace main body 11 and a laser irradiation system 12. The sintering furnace main body 11 is used for low-temperature sintering, and a window 13 is opened thereon; the laser irradiation system 12 is used for selective area high-temperature sintering and is arranged outside the sintering furnace main body 11. The laser irradiation system 12 includes a laser 121 and a high-speed galvanometer scanning system 122. The laser 121 is used to emit a laser beam, and the high-speed galvanometer scanning system 122 is used to control the deflection of the laser beam. The output end of the high-speed galvanometer scanning system 122 is arranged corresponding to the window 13.
[0012] Among them, the P region of the cell can be designed with an HJT (Hetero-junction with Intrinsic Thin-film) structure to efficiently absorb and convert light energy into electrical energy. The N region of the cell can adopt TOPCon technology to further optimize the interface passivation effect, reduce carrier recombination, and improve the cell performance. The sintering temperature of the P region of the cell is lower than that of the N region. The sintering temperature of the P region of the cell can be 200°C, and the sintering temperature of the N region of the cell can be 850 - 900°C. The cell sintering furnace 10 is provided with a window 13 on the sintering furnace body 11 for low-temperature sintering, and a laser irradiation system 12 for selective area high-temperature sintering is arranged outside the sintering furnace body 11 corresponding to the window 13. Thus, selective area laser irradiation can be carried out by the laser irradiation system 12 while low-temperature sintering is in progress, and high-temperature sintering is performed using the heat generated by the laser, so as to realize the simultaneous sintering of the P region and the N region of the cell, improve the cell production and preparation efficiency, and ensure the best metallization effect for each region through temperature-graded sintering. Moreover, the laser irradiation system 12 includes a laser 121 and a high-speed galvanometer scanning system 122. The high-speed galvanometer scanning system 122 performs selective and precise irradiation on the laser beam emitted by the laser 121, and uses the visual positioning method to ensure the position where the laser acts, improving the processing accuracy and efficiency, enabling a good ohmic contact to be formed in the metallized area of the N region of the cell, which is beneficial to improving the photoelectric conversion efficiency of the cell and is conducive to enhancing the cell performance and efficiency.
[0013] Specifically, the laser irradiation system 12 further includes a controller, and the controller is connected to the laser 121 and the high-speed galvanometer scanning system 122 to control the operation of the laser 121 and the high-speed galvanometer scanning system 122. Among them, the high-speed galvanometer scanning system 122 includes an X-Y optical scanning head, an electronic drive amplifier, and an optical reflection lens. The control signal of the controller drives the X-Y optical scanning head through the electronic drive amplifier, and cooperates with the optical reflection lens to deflect the laser beam in the X-Y plane, so that the laser beam can accurately pass through the window 13 and accurately focus the laser energy on the cell, ensuring the accuracy and efficiency of the sintering process. The laser 121 is used to stably output a high-quality laser beam. Cooperating with the high-speed galvanometer scanning system 122, the visual positioning method is adopted to ensure the position where the laser acts on the grid line, improving the processing accuracy and efficiency, enabling a good ohmic contact to be formed in the metallized area of the N region of the cell, which is beneficial to improving the photoelectric conversion efficiency of the cell.
[0014] Specifically, a mirror group, a beam expander 124, and a beam shaping mirror 125 are sequentially provided between the output end of the laser 121 and the input end of the high-speed galvanometer scanning system 122. The mirror group includes at least two mirrors 123 to reflect the laser beam emitted by the laser 121 to the incident end of the beam expander 124. The beam shaping mirror 125 is arranged at the exit end of the beam expander 124 to shape the expanded laser beam and output it to the high-speed galvanometer scanning system 122. A field lens may be connected to the output end of the high-speed galvanometer scanning system 122. The mirror group ensures precise control of the laser path, and the beam expander 124 ensures the uniformity of the laser energy distribution. The laser path is indicated by an arrow in the attached drawing.
[0015] Specifically, the diameter range of the laser spot where the laser irradiation system 12 irradiates the window 13 is 50 - 400 μm. Preferably, the wavelength range of the laser beam emitted by the laser 121 is 266 - 1064 nm. The laser power range of the laser 121 is 50 - 1000 W, and the overlap rate range of the laser spots is 0 - 100%. The controller gropes through the window 13 to test different laser powers, overlap rates, and wavelengths, so that the laser 121 obtains appropriate laser parameters and controls the laser 121 to operate according to the corresponding laser parameters.
[0016] Specifically, the sintering furnace main body 11 includes a heating plate and a housing covering the heating plate. The window 13 is arranged on the top surface of the housing. The heating plate is used to contact the battery slice entering the sintering furnace main body 11 to heat the battery slice, and the battery slice is heated to the sintering temperature of the P region by the heating plate to realize low-temperature sintering of the battery slice.
[0017] Specifically, a feed inlet 111 and a discharge outlet 112 are respectively opened at both ends of the housing, and the feed inlet 111 and the discharge outlet 112 are communicated. The battery slice enters the sintering furnace main body 11, so that the battery slice enters through the feed inlet 111, and the heating plate heats the battery slice to the sintering temperature of the P region to realize P region sintering of the battery slice. When the N region of the battery slice passes through the window 13, the laser irradiation system 12 irradiates the N region of the battery slice to realize N region sintering of the battery slice.
[0018] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the battery sintering system provided by an embodiment of the present invention. The battery sintering system 20 includes a conveying mechanism 21 and the above-mentioned battery sintering furnace 10. The conveying mechanism 21 is used to carry and convey the battery slices 30, and the conveying mechanism 21 passes through the sintering furnace main body 11 so that the battery slices 30 can enter the battery sintering furnace 10 for sintering.
[0019] Among them, the input end and the output end of the conveying mechanism 21 are located outside the sintering furnace body 11 for feeding and discharging. The battery sintering furnace 10 of the battery sintering system 20 is provided with a window 13 on the sintering furnace body 11 for low-temperature sintering, and a laser irradiation system 12 for selective area high-temperature sintering is arranged outside the sintering furnace body 11 corresponding to the window 13. Thus, selective area laser irradiation can be carried out by the laser irradiation system 12 while low-temperature sintering is in progress, and high-temperature sintering is carried out by using the heat generated by the laser, so as to realize the sintering of the P region and the N region of the battery chip simultaneously, improve the battery production and preparation efficiency. Moreover, the laser irradiation system 12 includes a laser 121 and a high-speed galvanometer scanning system 122. The high-speed galvanometer scanning system 122 performs selective area precise irradiation on the laser beam emitted by the laser 121 to ensure the position where the laser acts, improve the processing accuracy and efficiency, make a good ohmic contact formed in the metallization region of the N region of the battery chip, be beneficial to improving the photoelectric conversion efficiency of the battery chip, and be beneficial to improving the battery performance and efficiency.
[0020] Specifically, the conveying mechanism 21 includes a feeding conveyor belt 211 and a discharging conveyor belt 212. The discharging conveyor belt 212 is located at the output end of the feeding conveyor belt 211. The feeding conveyor belt 211 passes through the sintering furnace body 11. The feeding conveyor belt 211 includes a conveyor belt 2111 and rolling rods 2112 respectively arranged at both ends of the conveyor belt 2111. Among them, heating plates can be arranged on one side or both sides of the conveyor belt 2111 to contact the battery chip 30 carried on the conveyor belt 2111. Then the conveyor belt 2111 is located near the heating plates so that the heating plates can contact the battery chip 30 carried on the conveyor belt 2111, thereby heating the battery chip 30, facilitating the heating plates to heat to the sintering temperature of the P region to perform low-temperature sintering of the P region of the battery chip 30, while the laser irradiation system 12 performs high-temperature sintering of the N region of the battery chip 30 through the window 13, realizing the simultaneous sintering of the P region and the N region of the battery chip 30. The input end and the output end of the feeding conveyor belt 211 are located outside the sintering furnace body 11.
[0021] Preferably, the conveying mechanism 21 further includes a feeding driving device for driving the feeding conveyor belt 211 to move and a discharging driving device for driving the discharging conveyor belt 212 to move. The feeding driving device is connected to one of the rolling rods 2112 to drive the rolling rod 2112 to rotate and drive the conveyor belt to move, thereby transporting the battery chips.
[0022] Specifically, the battery sintering system 20 further includes a printing device and a drying device. The printing device and the drying device are disposed outside the input end of the conveying mechanism 21. The printing device is used to print metal grid lines on a preset metallization area on the surface of the battery chip 30, and the drying device is used to uniformly dry the battery chip 30 printed with metal grid lines to remove excess solvent and moisture, ensuring that a battery chip 30 to be sintered with good quality is obtained, which is beneficial to improving the conductivity and structural stability of the metal grid lines.
[0023] Preferably, the battery sintering system 20 further includes a nitrogen cabinet for storing the battery chips 30 to be sintered to ensure that the battery chips 30 to be sintered are in good physical condition and suitable for subsequent processing.
[0024] Based on the above design, during operation, the battery chips to be sintered are stored in the nitrogen cabinet to ensure their physical state. The battery chips to be sintered stored in the nitrogen cabinet are taken out and metal grid lines are printed on a preset metallization area on the surface of the battery chips by the printing device. The battery chips printed with metal grid lines are uniformly dried by the drying device. The dried battery chips printed with metal grid lines are placed at the input end of the feeding conveyor belt. The feeding conveyor belt moves to make the battery chips carried by it enter the sintering furnace body. The heating plate is heated to the sintering temperature of the P region to perform low-temperature sintering of the P region on the heating plate in contact with the heating plate. At this time, the conveyor belt can stop running for a preset time, and the preset time can be 1 to 2 s. At the same time, the laser irradiation system determines the position where the laser acts on the grid lines by means of visual positioning, and through laser patterning, selectively irradiates the N-region metal grid line area to achieve high-temperature sintering of the N region, so as to heat the P region and the N region of the battery chip to the corresponding sintering temperatures respectively, realizing temperature-division sintering and ensuring the best metallization effect in each region; after the laser scanning is completed, the movement of the feeding conveyor belt is resumed, and the sintered battery chips are conveyed to the next process. The next battery chip to be sintered with metal grid lines passes through the window, and the discharging conveyor belt transfers the sintered battery chips to the discharging area for subsequent packaging and quality inspection work.
[0025] In summary, the battery sintering furnace of the present utility model is provided with a window on the sintering furnace body for low-temperature sintering, and a laser irradiation system for selective area high-temperature sintering is arranged outside the sintering furnace body corresponding to the window. Thus, selective area laser irradiation can be carried out by using the laser irradiation system while low-temperature sintering is being performed, and high-temperature sintering is carried out by using the heat generated by the laser, so as to realize the sintering of the P region and the N region of the battery chip simultaneously, improve the battery production and preparation efficiency, ensure the best metallization effect in each region through temperature-division sintering. Moreover, the laser irradiation system includes a laser and a high-speed galvanometer scanning system. The high-speed galvanometer scanning system performs precise selective area irradiation on the laser beam emitted by the laser to ensure the position where the laser acts, improve the processing precision and efficiency, and form a good ohmic contact in the N-region metallization area of the battery chip, laying a solid foundation for further improving the photoelectric conversion efficiency, and being beneficial to improving the battery performance and efficiency. The battery sintering system of the present utility model also has the above functions and has strong practicability.
[0026] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims
1. A battery sintering furnace, characterized in that: include: The main body of the sintering furnace is used for low-temperature sintering and has a window; A laser irradiation system is used for performing selective high-temperature sintering and is arranged outside the sintering furnace body. The laser irradiation system includes a laser and a high-speed galvanometer scanning system. The laser is used to emit a laser beam, and the high-speed galvanometer scanning system is used to control the deflection of the laser beam. The output end of the high-speed galvanometer scanning system corresponds to the window setting.
2. The battery sintering furnace according to claim 1, characterized in that: The laser irradiation system also includes a controller, which is connected to the laser and the high-speed galvanometer scanning system to control the operation of the laser and the high-speed galvanometer scanning system.
3. The battery sintering furnace according to claim 1, characterized in that: A reflector group, a beam expander and a beam shaping mirror are arranged in sequence between the output end of the laser and the input end of the high-speed galvanometer scanning system. The reflector group includes at least two reflectors to reflect the laser beam emitted by the laser to the incident end of the beam expander, and the beam shaping mirror is arranged at the output end of the beam expander.
4. The battery sintering furnace according to claim 1, characterized in that: The diameter of the laser spot irradiated to the window by the laser irradiation system is in the range of 50 to 400 μm.
5. The battery sintering furnace according to claim 1, characterized in that: The wavelength of the laser beam emitted by the laser is in the range of 266 to 1064 nm.
6. The battery sintering furnace according to claim 1, characterized in that: The sintering furnace body comprises a heating plate and a shell covering the heating plate, and the window is arranged on the top surface of the shell.
7. The battery sintering furnace according to claim 6, characterized in that: A feed inlet and a discharge outlet are respectively provided at two ends of the shell, and the feed inlet and the discharge outlet are communicated with each other.
8. A battery sintering system, characterized in that: It comprises a conveying mechanism and the battery sintering furnace as claimed in any one of claims 1 to 7, wherein the conveying mechanism is used to carry and convey battery cells, and the conveying mechanism is arranged in the main body of the sintering furnace.
9. The battery sintering system according to claim 8, characterized in that: The conveying mechanism includes a loading conveyor belt and a unloading conveyor belt. The unloading conveyor belt is located at the output end of the loading conveyor belt. The loading conveyor belt passes through the sintering furnace body. The loading conveyor belt includes a conveyor belt and two rollers respectively arranged at both ends of the conveyor belt.
10. The battery sintering system according to claim 8, characterized in that: The battery sintering system also includes a printing device and a drying device, which are arranged on the outside of the input end of the conveying mechanism. The printing device is used to print metal grid lines on a preset metallized area on the surface of the battery cell, and the drying device is used to evenly dry the battery cell with the metal grid lines printed on it.