Temperature correction system and device for photovoltaic series welding machine

Abstract

The utility model relates to the technical field of temperature measurement and calibration, in particular to a temperature calibration system and device for a photovoltaic series welding machine, comprising a temperature acquisition module which comprises a plurality of groups of temperature collectors for acquiring the temperature of a target heating area; the output end of each temperature collector is connected with an output flat cable; the storage module stores the target temperature of the target heating area; the temperature calibration module is simultaneously connected with the storage module, the temperature acquisition module and the laser heater; the output flat cable transmits the collected temperature of the temperature collector to the temperature calibration module; the temperature calibration module outputs a heating power signal according to the target temperature and the collection temperature. The temperature calibration system is a multi-channel high-speed temperature acquisition system, can efficiently and accurately acquire the temperature, and calibrates the temperature by adjusting the laser emission power of each subarea. The multi-channel high-speed temperature acquisition system is isolated among channels, can adapt to various thermocouples, improves the reliability, can increase or decrease the number of the channels according to the number of the temperature partitions, and is high in flexibility.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measurement and temperature calibration, and in particular to a temperature calibration system and device for a photovoltaic string welding machine. Background Art

[0002] The VCSEL heating equipment of the photovoltaic string welding machine is a newly developed technology. It mainly uses the thermal effect of the VCSEL laser of a specific wavelength to heat the battery cell and the soldering ribbon attached to it to achieve the purpose of welding.

[0003] The advantages of laser welding mainly include rapid temperature rise, small accumulated temperature effect, and independently adjustable heating power in each temperature zone. However, laser welding needs to ensure that the entire battery cell has a consistent temperature rise curve, so as to prevent local cold solder joints or over-soldering. Due to the complex working environment of the stringer, the light-to-heat conversion of the laser is a process that is difficult to describe with an accurate formula. It is related to the light source power, illumination distance, light source wavelength, usage time, ambient temperature, battery cell material, flux characteristics, etc., and requires a large amount of experimental data to provide support. In order to ensure that the temperature rise curves of each temperature zone of laser welding are consistent, it is necessary to adjust the laser emission power of each temperature zone based on the temperature rise curves obtained from a large number of experiments. At present, it mainly relies on manual measurement to form a light intensity-time-temperature table.

[0004] Because there are few specialized supporting equipment in emerging industries, in most cases, high-speed multi-channel thermometers are purchased. Most of these thermometers are general-purpose and have no dedicated calibration software. They are difficult to integrate with existing equipment and can only be manually collected, tabulated and analyzed for each temperature measurement point, which is a very heavy workload.

[0005] Based on the prior art, no effective solution has been proposed for the above problems.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] To this end, the technical problem to be solved by the utility model is to overcome the problem that the existing laser welding equipment mainly relies on manual calibration. When the temperature zone reaches above 16, it takes 4-8 hours to manually calibrate a device, which is time-consuming and labor-intensive. In addition, because the laser chip also has the light decay phenomenon similar to the LED chip, the production line is generally calibrated once a month / quarter in actual application. If all calibrations are done manually, it will lead to a lot of waste of man-hours.

[0008] In order to solve the above technical problems, the utility model provides a temperature calibration system for a photovoltaic string welding machine, wherein the photovoltaic string welding machine includes a laser heating device, wherein the laser heating device includes a plurality of groups of laser heaters arranged in an array, wherein the plurality of groups of laser heaters are preset in a plurality of target heating areas, and the laser heaters are configured to change the heating temperature by adjusting the heating power, and characterized in that the temperature calibration system includes:

[0009] A temperature collection module, comprising a plurality of groups of temperature collectors, wherein the plurality of groups of temperature collectors are configured in one-to-one correspondence with the plurality of groups of laser heaters, and the temperature collectors are used to collect the temperature of the target heating area; each group of the temperature collectors has an independent output end, and the output end of each of the temperature collectors is connected to an output cable;

[0010] A storage module, which is used to store the target temperature of the target heating area;

[0011] A temperature calibration module is connected to the storage module, the temperature acquisition module and the laser heater at the same time; the output cable transmits the collected temperature of the temperature collector to the temperature calibration module; the temperature calibration module is configured to output a heating power signal according to the target temperature of the target heating area and the collected temperature, and the output end of the heating power signal is connected to the laser heater.

[0012] In one embodiment of the utility model, the temperature calibration module is also configured to output a compensation signal according to the heating power signal, and the output end of the compensation signal is connected to the heating device master control; the heating device master control is configured to control the laser heating device according to the compensation signal; the output end of the heating device master control is connected to the laser heating device.

[0013] In one embodiment of the present invention, the temperature acquisition module is further configured with a signal conversion unit, and the signal conversion unit is used to convert the temperature signal output by the temperature collector into a voltage signal, and the output end of the voltage signal is connected to the temperature calibration module.

[0014] In one embodiment of the present invention, the temperature calibration module is further configured with a filtering unit, the filtering unit is connected to the output end of the signal conversion unit, and the filtering unit is used to filter out clutter signals in the voltage signal.

[0015] In one embodiment of the present invention, the temperature calibration module is further configured with a voltage amplification unit, which is connected to the output end of the filtering unit. The voltage amplification unit is used to amplify the voltage signal after filtering out clutter by a preset multiple and output an amplified voltage signal.

[0016] In one embodiment of the present invention, the temperature calibration module is further configured with an analog-to-digital converter, which is connected to the output end of the voltage amplification unit, and is used to perform digital conversion on the voltage amplification signal and output a digital signal.

[0017] In one embodiment of the present invention, the temperature calibration module is further configured with a digital isolator, which is connected to the output end of the analog-to-digital converter. The digital isolator is used to isolate electrical noise and output a target digital signal.

[0018] The utility model also provides a temperature calibration device for a photovoltaic string welding machine, comprising a temperature calibration host, wherein the temperature calibration host is provided with a temperature calibration system for a photovoltaic string welding machine as described in any one of the above embodiments.

[0019] In one embodiment of the present invention, the temperature calibration host further comprises a host housing, and a control surface of the host housing is provided with an RS232 interface, an MCU burning interface, a MINI USB interface and a MODBUS interface.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] The temperature calibration system and device for photovoltaic string welding machine described in the utility model is a self-made multi-channel high-speed temperature acquisition system, which can acquire more accurate temperature by high sampling rate analog-to-digital conversion to meet the requirements of high-efficiency temperature measurement and calibration; the temperature is calibrated by adjusting the laser emission power of each partition. The multi-channel high-speed temperature acquisition system is isolated between channels, which can adapt to various types of K-type thermocouples, improve reliability, and the number of channels can be increased or decreased according to the number of temperature partitions, which is highly flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0023] Figure 1 This is a general flowchart of the working process of a temperature calibration system for a photovoltaic string welding machine provided by the utility model;

[0024] Figure 2 This is a system function module diagram of a temperature calibration system for a photovoltaic string welding machine provided by the utility model;

[0025] Figure 3 A schematic diagram of the structure of a temperature calibration device for a photovoltaic string welding machine provided by the utility model;

[0026] Explanation of the reference numerals in the specification: 1. Thermocouple cell; 11. Thermocouple; 2. Laser heating device; 3. Master control of heating device; 4. Temperature calibration system for photovoltaic string welding machine; 41. Temperature acquisition module; 42. Storage module; 43. Temperature calibration module; 5. Display screen; 6. Button; 7. Thermocouple plug; 8. Shaking switch; 9. Power supply plug; 10. LED indicator light; 11. RS232 interface; 12. MCU burning interface; 13. MINI USB interface; 14. MODBUS interface. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] Existing laser welding equipment mainly relies on manual calibration. When the temperature zones reach more than 16, it takes 4-8 hours to manually calibrate a device, which is time-consuming and labor-intensive. In addition, because laser chips also have the light decay phenomenon similar to LED chips, the production line is generally calibrated once a month / quarter in actual applications. If all calibrations are done manually, a lot of man-hours will be wasted. In order to solve the problems existing in the prior art, the utility model provides a temperature calibration system 4 for photovoltaic string welding machines, such as Figure 1 As shown, the photovoltaic string welding machine includes a laser heating device 2, wherein the laser heating device 2 includes a plurality of groups of laser heaters arranged in an array, the plurality of groups of laser heaters are preset in a plurality of target heating areas, and the laser heaters are configured to change the heating temperature by adjusting the heating power.

[0029] The temperature calibration system 4 described in the utility model includes:

[0030] The temperature acquisition module 41 includes a plurality of groups of temperature collectors (each group of temperature collectors is a K-type thermocouple temperature measuring wire), wherein the plurality of groups of temperature collectors are configured one-to-one with the plurality of groups of laser heaters, and the temperature collectors are used to collect the temperature of the target heating area; each group of the temperature collectors has an independent output end, and the output end of each of the temperature collectors is connected to an output cable;

[0031] A storage module 42, (the storage module is an SDRAM memory with high-speed reading and writing capabilities, connected to the MCU via an external storage controller EXMC of the MCU) is used to store the target temperature of the target heating area;

[0032] The temperature calibration module 43 (which is a GD32H737 series MCU with a 600M main frequency and a floating-point operation unit, and also has an external storage controller that can process data at high speed and convenience) is simultaneously connected to the storage module 42, the temperature acquisition module 41 and the laser heater; the output cable transmits the collected temperature of the temperature collector to the temperature calibration module 43; the temperature calibration module 43 is configured to output a heating power signal according to the target temperature of the target heating area and the collected temperature, and the output end of the heating power signal is connected to the laser heater.

[0033] In one embodiment, the temperature calibration module 43 is also configured to output a compensation signal according to the heating power signal, and the output end of the compensation signal is connected to the heating device master control 3; the heating device master control 3 is configured to control the laser heating device 2 according to the compensation signal; the output end of the heating device master control 3 is connected to the laser heating device 2.

[0034] In a specific implementation, multiple groups of temperature collectors in the temperature collection module 41 collect the temperature of the target heating area through thermocouples.

[0035] Specifically, first, place the battery cell 1 with multiple embedded thermocouples 11 (the thermocouples can be K-type thermocouples) on the conveyor belt under the laser heating device 2 (the position of each thermocouple 11 corresponds to a temperature control area of ​​the laser heating device 2), and connect the thermocouples 11 to the multi-channel high-speed temperature acquisition interface on the temperature calibration module 43 through an independent channel thermocouple bus (i.e., output cable).

[0036] The temperature acquisition module 41 acquires the temperature of the target heating area through the thermocouple 11 and sends it to the temperature calibration module 43. The temperature calibration module 43 compares the target temperature stored in the storage module 42 with the acquired temperature, calculates whether the power of the target heating area is too large or too small, and outputs a heating power signal according to the target temperature, and outputs a compensation signal to the heating device master control 3 according to the heating power signal.

[0037] The heating device master control 3 controls the laser heating device to cool down or heat up the temperature of the target heating area by adjusting the heating power. After the temperature is adjusted, the temperature is collected and measured again in this iterative cycle until the temperature of the target heating area reaches the target temperature. The compensation signal after the temperature measurement is completed is stored in the flash memory inside the laser heating device 2. The iterative calculation is performed inside the temperature calibration module 43, and the voltage and current are set in a closed loop without the need for host computer operation.

[0038] It should be noted that the temperature calibration module 43 uses an additional separate channel through the MCU chip to collect the near-end ambient temperature at the interface of the thermocouple 11 as the cold end compensation of the thermocouple 11. The temperature collected by the thermocouple and the cold end compensation are combined so that the temperature collected by the temperature collector is the actual temperature of the heating area of ​​the measured target.

[0039] In one embodiment, the temperature acquisition module 41 is configured with a signal conversion unit, and the signal conversion unit is used to convert the temperature signal output by the temperature collector into a voltage signal.

[0040] In one embodiment, the temperature calibration module 43 is configured with a filtering unit and a voltage amplifying unit. The filtering unit is connected to the output end of the signal conversion unit and is used to filter out the noise signal in the voltage signal; the voltage amplifying unit is connected to the output end of the filtering unit and is used to amplify the voltage signal after the noise is filtered out by a preset multiple.

[0041] In one embodiment, the temperature calibration module is further configured with an analog-to-digital converter, which is connected to the output end of the voltage amplification unit, and is used to perform digital conversion on the voltage amplification signal and output a digital signal.

[0042] In one embodiment, the temperature calibration module is further configured with a digital isolator, which is connected to the output end of the analog-to-digital converter. The digital isolator is used to isolate electrical noise and output a target digital signal.

[0043] For example, Figure 2 As shown, in the temperature calibration system (the temperature calibration system provided by the utility model is a multi-channel high-speed temperature acquisition system), the temperature collector in the temperature acquisition module 42 can convert the temperature into a voltage signal through the thermocouple 11 and send it to the analog front end. The main function of the analog front end is ESD protection, filtering, and removing clutter before amplifying the useful weak signal so that the analog output matches the range of the SAR analog-to-digital converter. The single-channel SAR analog-to-digital converter performs digital conversion on the amplified analog signal, and the data is sent to the MCU chip in the temperature calibration module 43 after passing through the digital isolator.

[0044] Since each channel thermocouple has an independent analog front end and an independent analog-to-digital converter, sampling is not affected, and precise synchronization can be achieved by triggering sampling. In this way, when processing data, the temperature difference caused by different sampling times can be avoided from interfering with the iteration of the heating curve.

[0045] The utility model also provides a temperature calibration device for a photovoltaic string welding machine, comprising a temperature calibration host, characterized in that a temperature calibration system for a photovoltaic string welding machine as described in any one of the above embodiments is arranged in the temperature calibration host.

[0046] In one embodiment, the temperature calibration host further comprises a host housing, and a control surface of the host housing is provided with an RS232 interface 11 , an MCU burning interface 12 , a MINI USB interface 13 and a MODBUS interface 14 .

[0047] For example, as shown in FIG3, it is a schematic diagram of a temperature calibration device for a photovoltaic string welding machine provided by the utility model, see Figure 3 The control surface of the host housing is provided with an RS232 interface 11, an MCU burning interface 12, a MINI USB interface 13, and a MODBUS interface 14 in sequence.

[0048] Furthermore, a shaking switch 8, a power supply plug 9, an LED indicator light 10, a display screen 5, a button 6, and a thermocouple plug 7 are also provided.

[0049] Specifically, the RS232 interface 11 is a DB9 connector, which is mainly used for serial communication with a computer and can output temperature measurement data. In addition, it can also be used for command interaction, execution information printing, etc. The LED indicator light 10 mainly indicates the system status and MCU working status. The MCU burning interface 12 is JTAG, which is used for MCU burning and program debugging. The MINI USB interface 13 is a backup communication interface. The MODBUS interface 14 is a communication interface with the PLC.

[0050] In particular, the MCU adopts the GD32H737 series, which has a 600M main frequency and a floating-point unit to ensure fast data processing. In addition, multiple power management chips can be set inside the hardware to convert the system's required 3.3V, 3V, 5V power and interface through voltage reduction, filtering and other processing.

[0051] In summary, the utility model provides a temperature calibration system and device for a photovoltaic string welding machine, wherein the temperature calibration system is a self-made multi-channel high-speed temperature acquisition system, which can acquire more accurate temperature by using high sampling rate analog-to-digital conversion to meet the requirements of high-efficiency temperature measurement and temperature calibration, and calibrate the temperature by adjusting the laser emission power of each partition. The multi-channel high-speed temperature acquisition system is isolated between channels, which can adapt to various types of K-type thermocouples, improve reliability, and the number of channels can be increased or decreased according to the number of temperature partitions, which is highly flexible.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A temperature calibration system for a photovoltaic string welding machine, the photovoltaic string welding machine includes a laser heating device, wherein: The laser heating device comprises a plurality of groups of laser heaters arranged in an array, the plurality of groups of laser heaters are preset in a plurality of target heating areas, the laser heaters are configured to change the heating temperature by adjusting the heating power, and is characterized in that the temperature calibration system comprises: A temperature collection module, comprising a plurality of groups of temperature collectors, wherein the plurality of groups of temperature collectors are configured in one-to-one correspondence with the plurality of groups of laser heaters, and the temperature collectors are used to collect the temperature of the target heating area; each group of the temperature collectors has an independent output end, and the output end of each of the temperature collectors is connected to an output cable; A storage module, which is used to store the target temperature of the target heating area; A temperature calibration module is connected to the storage module, the temperature acquisition module and the laser heater at the same time; the output cable transmits the collected temperature of the temperature collector to the temperature calibration module; the temperature calibration module is configured to output a heating power signal according to the target temperature of the target heating area and the collected temperature, and the output end of the heating power signal is connected to the laser heater.

2. The temperature calibration system for a photovoltaic string welding machine according to claim 1, characterized in that: The temperature calibration module is also configured to output a compensation signal according to the heating power signal, and the output end of the compensation signal is connected to the heating device master control; the heating device master control is configured to control the laser heating device according to the compensation signal; the output end of the heating device master control is connected to the laser heating device.

3. The temperature calibration system for photovoltaic string welding machine according to claim 1, characterized in that: The temperature acquisition module is further configured with a signal conversion unit, which is used to convert the temperature signal output by the temperature collector into a voltage signal, and the output end of the voltage signal is connected to the temperature calibration module.

4. The temperature calibration system for a photovoltaic string welding machine according to claim 3, characterized in that: The temperature calibration module is further configured with a filtering unit, which is connected to the output end of the signal conversion unit and is used to filter out clutter signals in the voltage signal.

5. The temperature calibration system for a photovoltaic string welding machine according to claim 4, characterized in that: The temperature calibration module is further configured with a voltage amplifying unit, which is connected to the output end of the filtering unit. The voltage amplifying unit is used to amplify the voltage signal after the clutter is filtered out by a preset multiple and output a voltage amplified signal.

6. The temperature calibration system for a photovoltaic string welding machine according to claim 5, characterized in that: The temperature calibration module is further configured with an analog-to-digital converter, which is connected to the output end of the voltage amplification unit. The analog-to-digital converter is used to perform digital conversion on the voltage amplification signal and output a digital signal.

7. The temperature calibration system for a photovoltaic string welding machine according to claim 6, characterized in that: The temperature calibration module is also configured with a digital isolator, which is connected to the output end of the analog-to-digital converter. The digital isolator is used to isolate electrical noise and output a target digital signal.

8. A temperature calibration device for a photovoltaic string welding machine, comprising a temperature calibration host, characterized in that: The temperature calibration host is provided with a temperature calibration system for a photovoltaic string welding machine as described in any one of claims 1 to 7.

9. The temperature calibration device for a photovoltaic string welding machine according to claim 8, characterized in that: The temperature calibration host also includes a host housing, and a control surface of the host housing is provided with an RS232 interface, an MCU burning interface, a MINI USB interface and a MODBUS interface.

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