A constant temperature optical path box for BC battery processing and a temperature control method

Abstract

This invention discloses a constant-temperature optical path box and temperature control method for BC battery processing. The device includes a water-cooled plate disposed on the bottom wall of the optical path box, a heating film disposed on the side wall, and a heat spreader lining the inner surface of the cavity. The temperature control method includes: when the internal temperature decreases from high to low and enters a preset pre-adjusted temperature range, a coordinated control process is executed. This process includes first activating the cooling unit to lower the temperature to near the lower limit of the pre-adjusted temperature, then shutting down the cooling unit and activating the heating unit to adjust the temperature to a smaller stable temperature range. This application, through a specific structural layout and a coordinated control strategy of "cooling and pressing first, then heating and fine-tuning," effectively overcomes system thermal inertia, avoids temperature oscillation and overshoot, and achieves high-precision stable temperature control, thereby ensuring beam stability and improving the yield of high-precision laser processing of BC batteries and other products.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic cell manufacturing technology, and in particular to a constant-temperature optical circuit box and temperature control method for BC cell processing. Background Technology

[0002] BC (back-contact) cells are a type of high-efficiency photovoltaic cell technology where both positive and negative electrodes are arranged on the back of the cell. With the development of the photovoltaic industry, the conversion efficiency of crystalline silicon solar cells is continuously improving, and high-efficiency cells are trending from double-sided contact to back-contact. The core advantage of BC cells lies in the back electrode design, and laser technology is the key means to achieve this design—lasers can finely etch the mask layer and passivation layer on the cell surface, forming a micron-level interdigitated P / N region structure, ensuring perfect contact between the electrodes and the semiconductor material. Therefore, in the manufacturing process of BC cells, laser processes (such as laser doping, laser grooving, and laser non-destructive cutting) have extremely high requirements for beam quality, pointing stability, and power consistency. During laser processing, the internal temperature of the optical path box changes due to environmental fluctuations, laser self-heating, and the absorption of trace amounts of laser energy by optical components. These temperature changes cause thermal expansion and contraction of optical components, changes in refractive index, and consequently, beam pointing drift, focal point shift, and output power fluctuations, ultimately affecting the processing accuracy and yield of BC cells.

[0003] In existing technologies, some equipment uses air cooling or water cooling to cool the entire optical pathbox. However, this results in low temperature control accuracy and problems such as temperature control lag and large local temperature differences, making it difficult to meet the stringent requirements for beam stability in BC cell laser processing. Therefore, there is an urgent need for a high-precision, fast-response optical pathbox temperature control solution. Summary of the Invention

[0004] The purpose of this invention is to provide a constant-temperature optical circuit box and temperature control method for BC battery processing, aiming to solve the problems of beam drift and power fluctuation caused by temperature in the existing optical circuit box.

[0005] To achieve the above objectives, the present invention provides a constant-temperature optical path box for BC battery processing, comprising a box body forming a sealed cavity, and the optical path box further comprising: An optical path channel is set inside the housing, and optical components are arranged along the optical path direction in the optical path channel. A temperature distribution plate that fits into the inner wall of the box; A heat-conducting diffusion plate is attached to the side wall of the box, and a heating film is attached to the outer surface of the heat-conducting diffusion plate. A water-cooled plate with a heat-conducting layer attached to the outer side of the bottom wall of the box is provided. Coolant channels are provided inside the water-cooled plate and are connected to an external coolant source. A temperature detection module is installed inside the box to collect the internal temperature of the box. The temperature control drive module is connected to the temperature detection module. Based on the feedback from the temperature detection module, the temperature control drive module controls the heating film to heat and the water cooling plate to cool. Heating and cooling do not work simultaneously.

[0006] Furthermore, it also includes an insulation layer, which covers the outer surface of the heating film and the outer surface of the water-cooled plate.

[0007] Furthermore, the coolant flow channel of the water-cooled plate is a serpentine or parallel circulating water channel, with the inlet and outlet of the coolant flow channel located on the same side of the box, and the coolant flow channel is connected to an external circulating chiller through a circulating pump.

[0008] Furthermore, the optical components include mirrors, beam expanders, beam splitters, and focusing lenses.

[0009] Furthermore, the box is filled with dry air or nitrogen, the heating film is a PI heating film, the heat spreader is an aluminum heat spreader, and the thermal conductive layer is thermal grease or thermal pad.

[0010] This invention also provides a temperature control method for a constant-temperature optical circuit box, used to control the temperature of the constant-temperature optical circuit box used for BC battery processing, specifically implemented according to the following steps: Step 1: Preset control parameters. The control parameters include target temperature T0, upper limit of target temperature T0+ΔT1, lower limit of target temperature T0-ΔT1, upper limit of final temperature T0+ΔT2, lower limit of final temperature T0-ΔT2, ΔT1>0, and ΔT2<ΔT1. The temperature control drive module loads the preset control parameters. Step 2: The temperature detection module detects the real-time temperature T inside the optical box and feeds it back to the temperature control drive module; Step 3, compare T with the target temperature range: If T>T0+ΔT1, exceeding the target temperature limit, the temperature control drive module will only activate the water cooling plate to cool down, so that the real-time temperature T satisfies T0-ΔT1≤T≤T0+ΔT1; If T>T0-ΔT1, which is lower than the lower limit of the target temperature, the temperature control drive module will only activate the heating film to raise the temperature, so that the real-time temperature T satisfies T0-ΔT1≤T≤T0+ΔT1; Step 4: At this time, T0-ΔT1≤T≤T0+ΔT1, the temperature control drive module first starts the water cooling plate to lower the internal temperature of the box to the target lower limit T0-ΔT1. Then the temperature control drive module starts the heating film for fine adjustment and rapid compensation. When the real-time temperature T is T0-ΔT2≤T≤T0+ΔT2, both cooling and heating are turned off. Step 5: Repeat step 2, and execute step 3 or step 4 according to the temperature range of the real-time temperature T, continuously looping to maintain the real-time temperature T satisfying T0-ΔT2≤T≤T0+ΔT2.

[0011] Furthermore, the temperature detection module includes no less than two temperature sensors, which are divided into a main temperature sensor and an auxiliary temperature sensor. The main temperature sensor is located near the base of the optical components in the optical component assembly, and the auxiliary temperature sensor is located at the corresponding position in the middle or bottom of the inner wall of the box on the heat spreader plate. The weighted average of all temperature sensors is taken as the current real-time internal temperature T of the enclosure. T = α·T1 + β·T2 Where T1 is the temperature value collected by the main temperature sensor, α is the weight of the temperature value collected by the main temperature sensor, α≥0.7, T2 is the temperature value collected by the auxiliary temperature sensor, β is the weight of the temperature value collected by the auxiliary temperature sensor, β=1-α, and α>β.

[0012] Furthermore, the temperature control method also includes setting a temperature alarm threshold T. min and T max T min <T0-ΔT1,T max >T0+ΔT1; When T>T is detected max When the temperature control drive module triggers a high temperature alarm, it forces the water cooling to turn on at full power, shuts down the heating, and prompts the user to check the status of the water cooling plate and its external devices. When T is detected <T min If the heating film fails to heat up after working continuously for more than the set time, the temperature control drive module will trigger a low temperature alarm, prompting you to check whether the heating film is damaged or whether the power supply is normal.

[0013] Furthermore, in step 4, the temperature control drive module first activates the water-cooling plate to lower the internal temperature of the box to the target lower limit. During the process, the water-cooled plate uses PWM proportional modulation, and the duty cycle of the water-cooled plate is... for: The heating film does not heat up during this process.

[0014] Furthermore, in step 4, the fine adjustment and rapid compensation of the heating film specifically involves performing PID fine-tuning based on the real-time temperature deviation after the heating film is activated. Among them, D heat This represents the heating duty cycle, and the temperature deviation e = T - (T0 - ΔT1), K. p K is the proportionality coefficient. i K is the integral coefficient. d Differential coefficients When the heating film is finely adjusted and rapidly compensated, the water cooling plate maintains a duty cycle of 5%~10% or is completely turned off. If the real-time temperature T shows an upward trend and approaches T0+ΔT1, the water cooling plate will be briefly intervened at a duty cycle of 10%~20% to perform pulsed cooling compensation until the real-time temperature T satisfies T0-ΔT2≤T≤T0+ΔT2.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By employing a specific structural layout of bottom cooling and sidewall heating, combined with a collaborative control strategy of "cooling and pressing first, then heating and fine-tuning" within the pre-regulated temperature range, the thermal inertia of the optical pathbox system can be effectively overcome, avoiding oscillations and overshoot near the target temperature point, and achieving high-precision stable temperature control. This precise and constant temperature environment ensures the stability of the physical dimensions and optical refractive index of the optical components inside the optical pathbox, thereby fundamentally suppressing beam pointing drift, focus shift, and power fluctuations, ensuring the quality of laser processing. Therefore, when applied to BC battery laser processing, this invention can ensure the long-term consistency of laser focal spot position and energy density, improve processing accuracy, and ultimately significantly improve the yield and performance of BC battery products. Furthermore, by shutting off the cooling and heating control strategies after the temperature enters the stable range, the system maintains the temperature in a stable state by relying on its own thermal inertia and insulation structure, thus achieving energy saving and consumption reduction. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a constant-temperature optical path box for BC battery processing according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the optical component assembly in Example 1; Figure 3 This is a schematic diagram of the refrigeration unit in Example 1; Figure 4 This is a schematic diagram of the heating unit in Example 1; Figure 5 This is a flowchart of a temperature control method for a constant temperature optical circuit box according to Embodiment 2 of the present invention.

[0018] The components are: 1. housing, 2. heat spreader, 3. heat-conducting diffuser, 4. heating film, 5. heat-conducting layer, 6. water-cooling plate, 7. coolant channel, 8. laser, 9. single-reflection total reflection mirror, 10. optical shutter A, 11. double-reflection total reflection mirror, 12. manual beam expander, 13. shaping lens, 14. optical shutter B, 15. aperture, and 16. laser scanning galvanometer system. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Before proceeding, it should be noted that, unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit the application. Before further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained.

[0021] Example 1 This embodiment provides a constant-temperature optical circuit box for BC battery processing, such as Figure 1 As shown, the device includes a housing 1. In a preferred embodiment, the housing 1 is integrally processed or spliced ​​from a metal material with good thermal conductivity (such as aluminum alloy or copper) to facilitate rapid conduction and equalization of internal temperature. The housing 1 forms a sealed cavity. In a preferred embodiment, the sealed cavity is filled with dry air or nitrogen.

[0022] The interior of housing 1 contains an optical path channel, within which optical components are arranged along the optical path direction, such as... Figure 2As shown, in laser precision processing applications such as BC batteries, the optical components include a laser 8, a single-reflection total reflection mirror, an optical shutter A10, a double-reflection total reflection mirror 11, a manual beam expander 12, a shaping lens 13, an optical shutter B14, an aperture 15, and a laser scanning galvanometer system 16 arranged sequentially along the optical path. Among them, the laser 8 is the light source of the entire system and outputs the initial laser beam; the single-reflection total reflection mirror is used to change the laser transmission direction and reflect the beam downwards; the optical shutter A10 is used to control the on / off of the optical path to realize the laser's opening / closing. The dual-reflector total reflection mirror 11 is used to change the laser transmission direction again, reflecting the beam forward; the manual beam expander 12 (divergence angle / magnification) is used to adjust the laser beam diameter and divergence angle to optimize beam quality; the shaping lens 13 is used to shape or adjust the beam; the optical shutter B14 is a re-set optical path control component to realize secondary on / off control; the aperture 15 is used to limit the cross-sectional size of the beam and filter out stray light; the laser scanning galvanometer system 16 is the final scanning and focusing unit, realizing the scanning and focusing of the laser on the processing plane.

[0023] To achieve active bidirectional temperature regulation inside the housing 1, the housing 1 is equipped with spatially separated cooling and heating units. Specifically, as follows: Figure 3 As shown, the cooling unit is a water-cooled plate 6 attached to the outer side of the bottom wall of the box 1 via a heat-conducting layer 5. Preferably, the heat-conducting layer 5 is thermal grease or a thermal pad. The heat-conducting layer 5 is in full contact with the bottom wall of the box 1 and the water-cooled plate 6 to avoid temperature fluctuations caused by air gaps. The water-cooled plate 6 has a coolant flow channel 7 inside. In a more specific embodiment, the coolant flow channel 7 of the water-cooled plate 6 is a serpentine or parallel circulating water channel. The inlet and outlet of the coolant flow channel 7 are located on the same side of the box 1. The coolant flow channel 7 is connected to an external circulating chiller through a circulation pump. The circulation pump and the external circulating chiller drive the coolant circulation, which can efficiently remove the heat inside the box 1 and achieve a powerful cooling effect. Accordingly, as Figure 4 The heating unit is disposed on at least one side wall of the box body 1. The heating unit includes a heat-conducting diffusion plate 3 attached to the side wall of the box body 1 and a heating film 4 attached to the outer surface of the heat-conducting diffusion plate 3. The heat-conducting diffusion plate 3 can also be made of a high thermal conductivity material such as aluminum plate. Its function is to first spread the relatively concentrated heat generated by the heating film 4 over a large area, and then transfer it to the side wall of the box body 1, thereby further improving the uniformity of heating. Preferably, the heating film 4 is a PI heating film. The heating unit is well attached to the outer surface of the side wall of the box body 1 and generates heat by passing electricity to compensate for the heating inside the box body 1.

[0024] To address the issue of uneven temperature distribution within the housing 1 caused by bottom cooling and sidewall heating, a key structural feature of this constant-temperature optical path box is the inclusion of a temperature distribution plate 2. The temperature distribution plate 2 is preferably a metal plate with high thermal conductivity, such as an aluminum plate with a thickness of 3-5 mm. Its shape matches the internal contour of the housing 1 and it is tightly fitted to the inner walls of the housing 1, including the inner bottom wall and inner sidewalls. The temperature distribution plate 2 acts as a heat buffer and distribution layer, rapidly and uniformly dissipating the cold energy from the bottom cooling unit and the heat from the sidewall heating unit throughout the entire housing 1. This effectively eliminates localized temperature differences within the housing 1, ensuring that optical components positioned in different locations are in a uniform temperature field. Preferably, thermally conductive silicone grease is applied between the temperature distribution plate 2 and the optical components.

[0025] In addition, in order to thermally isolate the optical circuit box from the external environment, reduce the interference of ambient temperature fluctuations on internal temperature control and improve energy efficiency, an insulation layer is integrally covered on the outer surface of the heating film 4 and the outer surface of the water-cooled plate 6. Preferably, the insulation layer can be made of a material with low thermal conductivity, such as aerogel or polyurethane foam.

[0026] To achieve precise control of the aforementioned hardware, the optical path box in this embodiment is equipped with a control system. The core of the entire control system is a temperature control drive module, which can be implemented by a programmable logic controller, a microcontroller, or a dedicated temperature control instrument. The input terminal of the temperature control drive module is connected to a temperature detection module, which is responsible for monitoring the temperature inside the box 1 in real time. In this embodiment, to more accurately reflect the average temperature or the temperature at key locations inside the box 1, the temperature detection module includes at least two temperature sensors, preferably thermocouples or thermistors. These temperature sensors are divided into a main temperature sensor and an auxiliary temperature sensor. The main temperature sensor is located near the base of the optical components in the optical component assembly, and the auxiliary temperature sensor is located on the heat spreader 2 at a corresponding position in the middle or bottom of the inner wall of the box 1.

[0027] Example 2 This embodiment provides a temperature control method for a constant-temperature optical circuit box, used for temperature control of the constant-temperature optical circuit box used in BC battery processing in Embodiment 1. It does not employ a single control mode, but rather a strategy of "segmented collaborative control combined with hysteresis switching and bias compensation." The core idea is to set a temperature pre-adjustment window near the target temperature, actively cool and suppress the temperature to the lower limit boundary within this window, then start heating for fine compensation, allowing the temperature to quickly and smoothly enter the temperature stability window before completely shutting down all actuators. Utilizing the insulation layer of the box body 1 and the natural buffering of thermal inertia, low power consumption and high-precision constant temperature maintenance are achieved. This aims to overcome the problems of easy oscillation and large overshoot of traditional single-switch control and single PID control, and is particularly suitable for optical circuit box systems with large thermal inertia. Figure 5As shown, this temperature control method is implemented according to the following steps: Step 1: Preset control parameters. The control parameters include target temperature T0, upper limit of target temperature T0+ΔT1, lower limit of target temperature T0-ΔT1, upper limit of final temperature T0+ΔT2, and lower limit of final temperature T0-ΔT2, where ΔT1=1℃ and ΔT2=0.5℃. The temperature control drive module loads the preset control parameters. Step 2: The temperature detection module detects the real-time temperature T inside the optical box 1 and feeds it back to the temperature control drive module; The weighted average value of all temperature sensors is taken as the current real-time internal temperature T of box 1: T = α·T1 + β·T2 Where T1 is the temperature value collected by the main temperature sensor, α is the weight of the temperature value collected by the main temperature sensor, α≥0.7, T2 is the temperature value collected by the auxiliary temperature sensor, β is the weight of the temperature value collected by the auxiliary temperature sensor, β=1-α, and α>β.

[0028] Step 3, compare T with the target temperature range: If T>T0+ΔT1, exceeding the target temperature limit, it indicates that the internal temperature of box 1 is too high and requires strong cooling. The temperature control drive module issues a command to start the circulation pump, so that the cooling water flows through the water cooling plate 6, while ensuring that the heating unit is in the off state, so that the real-time temperature T satisfies T0-ΔT1≤T≤T0+ΔT1. If T>T0-ΔT1, which is lower than the lower limit of the target temperature, it indicates that the internal temperature of box 1 is too low and heating is required. The temperature control drive module sends a command to turn on the power supply of the PI heating film to make it heat up, ensuring that the cooling unit is in the off state, so that the real-time temperature T satisfies T0-ΔT1≤T≤T0+ΔT1. Step 4: At this point, T0-ΔT1≤T≤T0+ΔT1, the cold and heat coordinated segmented control is activated, which is divided into two sub-stages: suppression and cooling, and fine compensation. This achieves rapid temperature reduction at high temperatures and precise temperature stabilization at low temperatures. During interval oscillation, the adjustment range is adaptively widened to suppress divergence. During the cooling and compression phase: the refrigeration unit does not shut down immediately but continues to operate, although its power is precisely regulated. As a preferred implementation, the temperature control drive module uses pulse width modulation (PWM) to control the operation of the circulating pump, with its duty cycle... for: Taking ΔT1=1℃ as an example: when T=T0+1℃, D cool =100%; when T=T0, D cool =50%; when T=T0-1℃, D cool=0% (i.e., reaching the lower limit). This gradually weakening cooling effect can pull the temperature down, but avoids a violent overshoot caused by cooling inertia. The heating unit is turned off during the pressing and cooling stage.

[0029] The goal of the cooling suppression phase is to suppress the real-time temperature T to the lower limit of the target temperature. Nearby. To achieve a smooth transition, a small hysteresis ΔH or switching point can be set, for example, ΔH = 0.2℃. When T is detected to decrease to... At this point, the cooling and pressing phase ends, and the process transitions to the fine compensation phase.

[0030] Fine-grained compensation stage (active heating dominant, water cooling assisted / maintained): The temperature control drive module shuts down or reduces the power of the cooling unit to a very low baseline value (e.g., 5%~10% duty cycle), while simultaneously starting the heating unit. At this time, the heating unit is not operating at full power; instead, it is controlled by the temperature control drive module using a more refined algorithm (e.g., PID proportional-integral-derivative algorithm), with the heating duty cycle D... heat for, Wherein, temperature deviation e = T - (T0 - ΔT1), K p =0.8 is the proportionality coefficient, K i =0.05 is the integral coefficient, K d =0.1 is the differential coefficient.

[0031] The heating unit compensates for heat with minimal power, effectively "supporting" the declining temperature and allowing it to rise very smoothly and slowly to the target temperature without overshoot. If the real-time temperature T shows an upward trend and approaches T0+ΔT1, the water cooling system will intervene briefly (cooling unit duty cycle 10%~20%) to perform pulsed cooling compensation until the real-time temperature T is T0-ΔT2≤T≤T0+ΔT2. At this point, the temperature control drive module will simultaneously shut down the cooling unit and the heating unit.

[0032] At this point, the temperature is maintained by the thermal inertia of the optical circuit box itself and the good thermal insulation performance of the external insulation layer.

[0033] Step 5: Temperature control does not actually end, but enters a low-power monitoring state, repeating step 2. If the temperature T drifts out of the stable window due to environmental changes or fluctuations in the internal heat source of the equipment, the entire control process will automatically return to the corresponding step 3 or step 4 according to the new range of T, and adjust again, continuously cycling to form a cyclical, dynamically stable closed-loop control, maintaining the real-time temperature T to satisfy T0-ΔT2≤T≤T0+ΔT2.

[0034] This embodiment can maintain the internal temperature of the housing 1 within a very small range of T0±0.1℃ for a long period of time, and its temperature control accuracy and stability far exceed those of traditional solutions. This stable temperature environment ensures a high degree of consistency in the physical dimensions and refractive index of the internal optical components, thereby effectively suppressing laser beam drift and power fluctuations. This provides a reliable guarantee for the high-precision laser processing of BC batteries, and ultimately helps to improve the product yield and performance consistency.

[0035] Example 3 This embodiment provides a temperature control method for a constant-temperature optical path box. Based on Embodiment 2, the temperature control method of this embodiment further includes setting a temperature alarm threshold T. min and T max T min <T0-ΔT1,T max >T0+ΔT1; When T>T is detected max When the temperature control drive module triggers a high temperature alarm, it forces the water cooling to turn on at full power and shuts down the heating, prompting the user to check the status of the water cooling plate 6 and its external devices. When T is detected <T min If the heating film 4 fails to heat up after working continuously for more than the set time, the temperature control drive module will trigger a low temperature alarm, prompting you to check whether the heating film 4 is damaged or whether the power supply is normal.

[0036] This embodiment sets a temperature alarm threshold and provides alarm prompts, enabling real-time monitoring of the internal temperature of the constant-temperature optical path box. It promptly detects abnormal temperature deviations, effectively maintaining stable internal temperature and reducing thermal deformation and beam deviation issues caused by temperature fluctuations. This ensures the precision and energy stability of the laser processing spot, guarantees the consistency of the BC battery laser processing process, and significantly improves the yield and performance uniformity of finished batteries. Simultaneously, it effectively protects precision optical components, water-cooling, and heating temperature control components, delaying equipment aging, reducing failure rates, and extending equipment lifespan. It also helps maintenance personnel quickly locate temperature control faults, shortening equipment downtime for repairs and reducing production and maintenance costs. Furthermore, it avoids safety hazards such as overheating of high-temperature circuits and leakage due to low-temperature condensation, standardizes equipment operating conditions, and assists in optimizing PID temperature control parameters and water-cooling duty cycle, balancing temperature control accuracy, production safety, and energy efficiency. This fully meets the constant-temperature control requirements for large-scale precision laser processing of BC batteries.

[0037] This invention discloses a constant-temperature optical circuit box for BC battery processing. Through bidirectional active temperature control using a water-cooled plate and a PI heating film, combined with closed-loop feedback control, it achieves rapid, accurate, and stable adjustment of the internal ambient temperature of the optical circuit box, thereby effectively suppressing beam drift and power fluctuations caused by temperature and improving the consistency and yield of BC battery laser processing.

[0038] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the nature and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention.

Claims

1. A constant-temperature optical path box for BC battery processing, comprising a box body forming a sealed cavity, characterized in that, The optical path box also includes: An optical path channel is provided inside the housing, and optical components are arranged in the optical path channel along the optical path direction. A temperature distribution plate that fits against the inner wall of the box; A heat-conducting diffusion plate is attached to the side wall of the box body, and a heating film is attached to the outer surface of the heat-conducting diffusion plate; A water-cooled plate with a heat-conducting layer attached to the outer side of the bottom wall of the box is provided. The water-cooled plate has a coolant flow channel inside, and the coolant flow channel is connected to an external coolant source. A temperature detection module is installed inside the box, and the temperature detection module collects the temperature inside the box. A temperature control drive module connected to the temperature detection module controls the heating film to heat and the water-cooling plate to cool based on feedback from the temperature detection module. The heating and cooling do not operate simultaneously.

2. The constant-temperature optical path box for BC battery processing according to claim 1, characterized in that, It also includes a heat insulation layer, which covers the outer surface of the heating film and the outer surface of the water-cooled plate.

3. The constant-temperature optical path box for BC battery processing according to claim 1, characterized in that, The coolant flow channel of the water-cooled plate is a serpentine or parallel circulating water channel. The inlet and outlet of the coolant flow channel are located on the same side of the box body. The coolant flow channel is connected to an external circulating chiller through a circulating pump.

4. The constant-temperature optical path box for BC battery processing according to claim 3, characterized in that, The optical components include a reflector, a beam expander, a beam splitter, and a focusing lens.

5. The constant-temperature optical path box for BC battery processing according to claim 3, characterized in that, The box is filled with dry air or nitrogen, the heating film is a PI heating film, the heat spreader is an aluminum heat spreader, and the thermal conductive layer is thermal grease or thermal pad.

6. A temperature control method for a constant-temperature optical circuit box, used for temperature control of the constant-temperature optical circuit box for BC battery processing as described in any one of claims 1-5, characterized in that, The specific steps are as follows: Step 1: Preset control parameters. The control parameters include target temperature T0, upper limit of target temperature T0+ΔT1, lower limit of target temperature T0-ΔT1, upper limit of final temperature T0+ΔT2, lower limit of final temperature T0-ΔT2, ΔT1>0, and ΔT2<ΔT1. The temperature control drive module loads the preset control parameters. Step 2: The temperature detection module detects the real-time temperature T inside the optical box and feeds it back to the temperature control drive module; Step 3, compare T with the target temperature range: If T>T0+ΔT1, exceeding the target temperature limit, the temperature control drive module will only activate the water cooling plate to cool down, so that the real-time temperature T satisfies T0-ΔT1≤T≤T0+ΔT1; If T>T0-ΔT1, which is lower than the lower limit of the target temperature, the temperature control drive module will only activate the heating film to raise the temperature, so that the real-time temperature T satisfies T0-ΔT1≤T≤T0+ΔT1; Step 4: At this time, T0-ΔT1≤T≤T0+ΔT1, the temperature control drive module first activates the water cooling plate to lower the internal temperature of the box to the target lower limit T0-ΔT1. Then, the temperature control drive module activates the heating film for fine adjustment and rapid compensation. When the real-time temperature T is T0-ΔT2≤T≤T0+ΔT2, both cooling and heating are turned off. Step 5: Repeat step 2, and execute step 3 or step 4 according to the temperature range of the real-time temperature T, continuously looping to maintain the real-time temperature T satisfying T0-ΔT2≤T≤T0+ΔT2.

7. The temperature control method for the constant-temperature optical path box according to claim 6, characterized in that, The temperature detection module includes at least two temperature sensors, which are divided into a main temperature sensor and an auxiliary temperature sensor. The main temperature sensor is located near the base of the optical component in the optical component assembly, and the auxiliary temperature sensor is located at the corresponding position in the middle or bottom of the inner wall of the box on the heat spreader plate. The weighted average of all temperature sensors is taken as the current real-time internal temperature T of the enclosure. T = α·T1 + β·T2 Where T1 is the temperature value collected by the main temperature sensor, α is the weight of the temperature value collected by the main temperature sensor, α≥0.7, T2 is the temperature value collected by the auxiliary temperature sensor, β is the weight of the temperature value collected by the auxiliary temperature sensor, β=1-α, and α>β.

8. The temperature control method for the constant-temperature optical path box according to claim 6, characterized in that, The temperature control method also includes setting a temperature alarm threshold T. min and T max T min <T0-ΔT1,T max >T0+ΔT1; When T>T is detected max When the temperature control drive module triggers a high temperature alarm, it forces the water cooling to turn on at full power, shuts down the heating, and prompts the user to check the status of the water cooling plate and its external devices. When T is detected <T min If the heating film fails to heat up after working continuously for more than the set time, the temperature control drive module will trigger a low temperature alarm, prompting the user to check whether the heating film is damaged or whether the power supply is normal.

9. The temperature control method for the constant-temperature optical path box according to claim 6, characterized in that, In step 4, the temperature control drive module first activates the water-cooling plate to lower the internal temperature of the box to the target lower limit. During the process, the water-cooled plate uses PWM proportional modulation, and the duty cycle of the water-cooled plate is... for: The heating film does not heat up during this process.

10. The temperature control method for the constant-temperature optical path box according to claim 6, characterized in that, Step 4, which involves activating the heating film for fine-tuning and rapid compensation, specifically involves performing PID fine-tuning based on the real-time temperature deviation after the heating film is activated. Among them, D heat This represents the heating duty cycle, and the temperature deviation e = T - (T0 - ΔT1), K. p K is the proportionality coefficient. i K is the integral coefficient. d These are the differential coefficients; When the heating film is finely adjusted and rapidly compensated, the water cooling plate maintains a duty cycle of 5%~10% or is completely turned off. If the real-time temperature T shows a rising trend and approaches T0+ΔT1, the water cooling is briefly intervened at this time. The water cooling duty cycle of the water cooling plate is 10%~20% to perform pulsed cooling compensation until the real-time temperature T satisfies T0-ΔT2≤T≤T0+ΔT2.

Images