CN111129215B - Light source regeneration furnace and method for reducing efficiency attenuation of PERC (positive electrode resistance) battery - Google Patents
Light source regeneration furnace and method for reducing efficiency attenuation of PERC (positive electrode resistance) battery Download PDFInfo
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Abstract
The invention discloses a light source regeneration furnace and a method for reducing efficiency attenuation of a PERC battery, wherein the light source regeneration furnace comprises a furnace body, a furnace zone, an illumination system and a cooling system, wherein the furnace zone, the illumination system and the cooling system are arranged in the furnace body, the furnace body comprises a first temperature zone, a second temperature zone and a third temperature zone, the furnace zone penetrates through the first temperature zone, the second temperature zone and the third temperature zone, and the cooling system comprises a cold air system and an exhaust system. According to the invention, each temperature zone is independently provided with the cold air pipe and the exhaust air pipe, so that the problem of air turbulence caused by closed loop of the conventional light source regeneration furnace is effectively solved, the conditions of PERC battery fragments and drift are reduced, and the production yield is improved; in addition, the cooling system can accurately control the temperature of each temperature zone so as to meet the requirements of the photoinduced regeneration technology, thereby improving the quality of the PERC battery.
Description
Technical Field
The invention relates to the technical field of solar cell production equipment, in particular to a light source regeneration furnace and a method for reducing efficiency attenuation of a PERC cell.
Background
After the PERC battery is sintered, defects, impurities and the like in the PERC battery body need to be passivated through a light source regeneration furnace and a photo-induced regeneration technology. The light source regeneration furnace mainly comprises an illumination system, a cooling system and a PLC (programmable logic controller) control system, wherein the quality of the cooling system influences the temperature control in the light source furnace, the service lives of a hardware LED lamp panel and a circuit board, and the most important influences the passivation effect and the operation stability of the PERC battery, such as fragments, laminations and the like.
The cooling system of the existing light source regeneration furnace is of a circulating structure, an air outlet of an air exhaust pipe is connected with an air inlet pipe, and the air cooling in the furnace generates turbulence, so that the PERC battery in the furnace is easy to drift and crack. In addition, the existing light source regeneration furnace is difficult to accurately control the temperature in the furnace, and the quality of the PERC battery is influenced.
Disclosure of Invention
The invention aims to provide a light source regeneration furnace, which can accurately control the temperature in the furnace and improve the quality of a PERC battery.
The technical problem to be solved by the invention is to improve a method for reducing efficiency attenuation of the PERC battery and improve the quality of the PERC battery.
In order to solve the technical problem, the invention provides a light source regeneration furnace, which comprises a furnace body, a furnace zone, an illumination system and a cooling system, wherein the furnace zone, the illumination system and the cooling system are arranged in the furnace body;
the air cooling system comprises a first air cooling air pipe, a second air cooling air pipe and a third air cooling air pipe, wherein an air outlet of the first air cooling air pipe is arranged above the first temperature zone furnace zone, an air outlet of the second air cooling air pipe is arranged above the second temperature zone furnace zone, and an air outlet of the third air cooling air pipe is arranged above the third temperature zone furnace zone;
the air exhaust system comprises a first air exhaust pipe, a second air exhaust pipe and a third air exhaust pipe, wherein an air inlet of the first air exhaust pipe is arranged below the first temperature zone furnace zone, an air inlet of the second air exhaust pipe is arranged below the second temperature zone furnace zone, and an air inlet of the third air exhaust pipe is arranged below the third temperature zone furnace zone;
the illumination system irradiates and heats the PERC battery on the furnace belt, the cold air system leads cold air into each temperature zone through a first cold air pipe, a second cold air pipe and a third cold air pipe, and the exhaust system exhausts hot air of each temperature zone through the first exhaust air pipe, the second exhaust air pipe and the third exhaust air pipe so as to accurately control the temperature of each temperature zone;
the PERC battery sequentially passes through the first temperature zone, the second temperature zone and the third temperature zone along with the furnace zone so as to activate a hydrogen dielectric film of the PERC battery and passivate defects and impurities in the PERC battery.
As the improvement of above-mentioned scheme, be equipped with dustproof filter screen in first air conditioning tuber pipe, second air conditioning tuber pipe and the third air conditioning tuber pipe, still be equipped with the cooling plate in first air conditioning tuber pipe and the third air conditioning tuber pipe, air conditioning is in proper order through dustproof filter screen and cooling plate, then discharges from the air outlet.
As an improvement of the scheme, the temperature of the cold air entering the first cold air pipe, the second cold air pipe and the third cold air pipe is 15-20 ℃, and the temperature of the cold air passing through the cooling plate is reduced by 3-8 ℃.
As an improvement of the scheme, the air inlet volume of each cold air duct is less than or equal to the air exhaust volume of each air exhaust duct.
As an improvement of the scheme, the air inlet volume of each cold air duct is 10-30 m3Min, the air exhaust volume of each air exhaust duct is 10-40 m3/min。
As an improvement of the scheme, the illumination system comprises an upper light source, the upper light source is arranged between the air outlet and the furnace belt, and the cold air from the air outlet uniformly carries the heat generated by the upper light source to the PERC battery.
As an improvement of the scheme, the light intensity density of the upper light source is 5-40 kw/m2The temperature of the first temperature zone is 210-270 ℃, the temperature of the second temperature zone is 210-270 ℃, and the temperature of the third temperature zone is 210-270 ℃.
As an improvement of the scheme, the belt speed of the furnace belt is 5-9 m/min.
Correspondingly, the invention also provides a method for reducing the efficiency attenuation of the PERC battery, and the PERC battery is placed in the light source regeneration furnace after being sintered;
adjusting the air inlet volume of each air conditioning duct to 10-30 m3Min, adjusting the air exhaust volume of each air exhaust duct to be 10-40 m3Min, wherein the air inlet volume of each cold air duct is less than or equal to the air exhaust volume of each air exhaust duct;
adjusting the light intensity density of each temperature zone to be 5-40 kw/m2The temperature of the first temperature zone is 210-270 ℃, the temperature of the second temperature zone is 210-270 ℃, and the temperature of the third temperature zone is 210-270 ℃;
the PERC battery sequentially passes through the first temperature zone, the second temperature zone and the third temperature zone, a hydrogen dielectric film of the PERC battery is activated, and defects and impurities in the PERC battery are passivated.
As an improvement of the scheme, the belt speed of the furnace belt is adjusted to be 5-9 m/min;
after being irradiated by a regenerative furnace, the PERC battery is cooled to room temperature so as to freeze the passivation effect and achieve stability.
The implementation of the invention has the following beneficial effects:
according to the invention, each temperature zone is independently provided with the cold air pipe and the exhaust air pipe, so that the problem of air turbulence caused by closed loop of the conventional light source regeneration furnace is effectively solved, the conditions of PERC battery fragments and drift are reduced, and the production yield is improved; in addition, the cooling system can accurately control the temperature of each temperature zone so as to meet the requirements of the photoinduced regeneration technology, thereby improving the quality of the PERC battery.
The invention effectively passivates defects and impurities in the battery body by controlling the light intensity density, the temperature and the belt speed, so that the photoinduced attenuation of the PERC battery is reduced from 1.2-2.0% to about 0.5-0.8%, the reliability of the PERC battery is effectively improved, and the conversion efficiency and the light utilization rate of the solar battery are improved.
Drawings
FIG. 1 is a schematic view of a light source regenerating oven according to the present invention;
FIG. 2 is a graph comparing furnace temperature curves of the light source regenerating furnace of example 1 of the present invention and comparative example 1;
FIG. 3 is a graph comparing the furnace temperature curves of the light source regenerating furnace of example 2 of the present invention and comparative example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the light source regeneration furnace provided by the invention comprises a furnace body 1, a furnace zone 2 arranged in the furnace body 1, an illumination system and a cooling system, wherein the furnace body 1 comprises a first temperature zone 11, a second temperature zone 12 and a third temperature zone 13, the furnace zone 2 passes through the first temperature zone 11, the second temperature zone 12 and the third temperature zone 13, and the cooling system comprises a cold air system and an exhaust system.
Specifically, the air conditioning system includes first air conditioning tuber pipe 41, second air conditioning tuber pipe 42 and third air conditioning tuber pipe 43, the top of first warm area 11 furnace zone 2 is located to the air outlet of first air conditioning tuber pipe 41, the top of second warm area 12 furnace zone 2 is located to the air outlet of second air conditioning tuber pipe 42, the top of third warm area 13 furnace zone 2 is located to the air outlet of third air conditioning tuber pipe 43. The exhaust system comprises a first exhaust air pipe 51, a second exhaust air pipe 52 and a third exhaust air pipe 53, wherein an air inlet of the first exhaust air pipe 51 is arranged below the furnace zone 2 of the first temperature zone 11, an air inlet of the second exhaust air pipe 52 is arranged below the furnace zone 2 of the second temperature zone 12, and an air inlet of the third exhaust air pipe 53 is arranged below the furnace zone 2 of the third temperature zone 13.
The illumination system of the invention irradiates and heats the PERC battery 6 on the furnace belt 2, the cold air system leads cold air into each temperature zone through a first cold air duct 41, a second cold air duct 42 and a third cold air duct 43, and the exhaust system exhausts hot air of each temperature zone through a first exhaust air duct 51, a second exhaust air duct 52 and a third exhaust air duct 53 so as to accurately control the temperature of each temperature zone; the PERC cell 6 sequentially passes through the first temperature zone 11, the second temperature zone 12 and the third temperature zone 13 along with the furnace zone 2, so as to activate a hydrogen dielectric film of the PERC cell 6 and passivate defects and impurities in the PERC cell 6.
It should be noted that, the first cold air duct 41, the second cold air duct 42 and the third cold air duct 43 of the present invention are all separately connected to a cooling device outside the furnace body, and each cold air duct separately cools the corresponding temperature zone; the first exhaust air duct 51, the second exhaust air duct 52 and the third exhaust air duct 53 respectively exhaust the gas in the corresponding temperature zone out of the furnace body.
According to the invention, each temperature zone is independently provided with the cold air pipe and the exhaust air pipe, so that the problem of air turbulence caused by closed loop of the conventional light source regeneration furnace is effectively solved, the conditions of PERC battery fragments and drift are reduced, and the production yield is improved; in addition, the cooling system can accurately control the temperature of each temperature zone so as to meet the requirements of the photoinduced regeneration technology, thereby improving the quality of the PERC battery.
In order to reduce the efficiency attenuation of the PERC battery, the first, second and third cold air ducts 41, 42 and 43 are provided with dust-proof filters 7 to prevent dust and impurities from entering.
Further, still be equipped with cooling plate 8 in first air conditioning tuber pipe 41 and the third air conditioning tuber pipe 43, air conditioning passes through dustproof filter screen 7 and cooling plate 8 in proper order, then discharges from the air outlet, and the air conditioning temperature through cooling plate 8 reduces 3 ~ 8 ℃. The cooling plate is arranged in the cold air duct, so that the temperature of the cold air can be further reduced, the energy consumption is reduced, and the cold air can be uniformly distributed on the PERC battery.
Preferably, the temperature of the cold air entering the first cold air duct, the second cold air duct and the third cold air duct is 15-20 ℃.
It should be noted that the air intake volume of each air conditioning duct of the present invention is not more than the air exhaust volume of each air exhaust duct, so as to achieve a good temperature control effect.
Preferably, the diameter of each cold air duct is 10-40 cm, and the diameter of each exhaust air duct is 10-30 cm.
It should be noted that the air intake volume of the cool air duct and the air exhaust volume of the air exhaust duct play an important role in the quality of the PERC battery. If the air intake volume and the air exhaust volume are too large, the temperature change is large, the temperature of each temperature zone is difficult to accurately control, if the air intake volume and the air exhaust volume are too small, a long time is needed for reaching the required temperature, and in the long time, the PERC battery is actually in an undesirable temperature environment, so that the quality of the PERC battery is influenced.
Preferably, the air inlet volume of each cold air duct is 10-30 m3Min, the air exhaust volume of each air exhaust duct is 10-40 m3/min。
The illumination system comprises an upper light source 3, wherein the upper light source 3 is arranged between an air outlet and a furnace belt 2, and the cold air from the air outlet uniformly carries the heat generated by the upper light source 3 to a PERC battery 6.
According to the invention, through the mutual matching of the heating system and the cooling system, the temperature of different temperature areas can be accurately controlled. Preferably, the temperature of the first temperature zone is 210-270 ℃, the temperature of the second temperature zone is 210-. Preferably, the light intensity density of the upper light source is 5-40 kw/m2。
In order to accurately control the temperature of each temperature zone and ensure that the PERC cell can fully complete the photoinduced regeneration technology in the furnace body, the length of each temperature zone is 0.5-1.5 m. In order to facilitate the setting of parameters and the adjustment of the process, the length of each temperature zone is the same.
It should be noted that the speed of the furnace belt plays an important role in whether the PERC cell can sufficiently passivate internal defects and impurities. Preferably, the belt speed of the furnace belt is 5-9 m/min. If the speed of the furnace belt is too high, the illumination is insufficient, and the light-induced attenuation of the PERC cell cannot be effectively reduced; if the furnace belt speed is too slow, the PERC battery is too long in the furnace body, and the photoelectric conversion efficiency of the PERC battery is influenced.
Preferably, the light source is an LED lamp with a wavelength range of 300-1100 nm.
Correspondingly, the invention also provides a method for reducing the efficiency attenuation of the PERC battery, and the PERC battery is placed in the light source regeneration furnace after being sintered;
adjusting the air inlet volume of each air conditioning duct to 10-30 m3Min, adjusting the air exhaust volume of each air exhaust duct to be 10-40 m3Min, wherein the air inlet volume of each cold air duct is less than or equal to the air exhaust volume of each air exhaust duct;
adjusting the light intensity density of each temperature zone to be 5-40 kw/m2The temperature of the first temperature zone is 210-270 ℃, the temperature of the second temperature zone is 210-270 ℃, and the temperature of the third temperature zone is 210-270 ℃;
the PERC battery sequentially passes through the first temperature zone, the second temperature zone and the third temperature zone, a hydrogen dielectric film of the PERC battery is activated, and defects and impurities in the PERC battery are passivated.
Preferably, the belt speed of the furnace belt is adjusted to 5-9 m/min.
It should be noted that the PERC cell is cooled to room temperature after being subjected to the light treatment in the regeneration furnace, so as to freeze the passivation effect and achieve stability.
The invention controls different light intensity densities, temperatures and belt speeds, more effectively passivates defects and impurities in the battery body, reduces the photoinduced attenuation of the PERC battery from 1.2-2.0% to about 0.5-0.8%, effectively improves the reliability of the PERC battery, and improves the conversion efficiency and the light utilization rate of the solar battery.
The invention will be further illustrated by the following specific examples
Example 1
Placing the sintered PERC battery in a light source regeneration furnace, wherein the length of each temperature zone is 1m, and the furnace belt speed is 8 m/min;
setting the output power of the LED lamp of the first temperature zone to be 80% and the output power of the cold air to be 30%;
setting the output power of the LED lamp of the second temperature zone to be 85 percent and the output power of the cold air to be 30 percent;
the output power of the LED lamp in the third temperature zone is 85%, and the output power of the cold air is 30%.
It should be noted that, in this embodiment, the output power of the LED lamp and the output power of the cold air are required to be set so that the light intensity density of the LED lamp reaches 18kw/m2The temperature of each temperature zone in the furnace reaches 230 +/-10 ℃.
Comparative example 1
Placing the sintered PERC battery in an existing light source regeneration furnace, wherein the length of each temperature zone is 1m, and the furnace belt speed is 8 m/min;
setting the output power of the LED lamp of the first temperature zone to be 80% and the output power of the cold air to be 30%;
setting the output power of the LED lamp of the second temperature zone to be 85 percent and the output power of the cold air to be 30 percent;
the output power of the LED lamp in the third temperature zone is 85%, and the output power of the cold air is 30%.
It should be noted that, in this embodiment, the output power of the LED lamp and the output power of the cold air are required to be set so that the light intensity density of the LED lamp reaches 18kw/m2The temperature of each temperature zone in the furnace reaches 230 +/-10 ℃.
The light source regenerating ovens of example 1 and comparative example 1 were subjected to oven temperature tests using a DATAPAQ18 oven thermometer and temperature scale, the specific oven temperature curves are shown in FIG. 2.
Example 1 and comparative example 1 light source regenerating ovens, the air inlet volume is set to 20m3/minThe air exhaust volume is set to be 25m3/min。
In the existing light source regeneration furnace, the temperature of the first temperature zone is raised to 290 +/-10 ℃, and the temperature of the first temperature zone can be kept at 230 +/-10 ℃ in the light source regeneration furnace.
In order to keep the temperature of the process furnace constant at 230 +/-10 ℃, the output power of the cold air in the embodiment 1 needs to be increased by 50%, and due to the increase of the air pressure and the structure of the internal circulation air path, the air in the furnace generates turbulence, so that the wafers in the furnace drift and are broken, and meanwhile, the temperature of the process furnace cannot be reduced to the effective temperature.
Example 2
Placing the sintered PERC battery in a light source regeneration furnace, wherein the length of each temperature zone is 1m, and the furnace belt speed is 9 m/min;
setting the output power of the LED lamp of the first temperature zone to be 80% and the output power of the cold air to be 30%;
setting the output power of the LED lamp of the second temperature zone to be 80% and the output power of the cold air to be 30%;
the output power of the LED lamp in the third temperature zone is 80%, and the output power of the cold air is 25%.
It should be noted that, in this embodiment, the output power of the LED lamp and the output power of the cold air are required to be set so that the light intensity density of the LED lamp reaches 18kw/m2And the temperature of each temperature zone in the furnace reaches 240 +/-10 ℃.
Comparative example 2
Placing the sintered PERC battery in the existing light source regeneration furnace, wherein the length of each temperature zone is 1m, and the furnace belt speed is 9 m/min;
setting the output power of the LED lamp of the first temperature zone to be 40% and the output power of the cold air to be 40%;
setting the output power of the LED lamp of the second temperature zone to be 80% and the output power of the cold air to be 30%;
the output power of the LED lamp in the third temperature zone is 80%, and the output power of the cold air is 30%.
It should be noted that, in this embodiment, the output power of the LED lamp and the output power of the cold air are required to be set so that the temperature of each temperature zone in the furnace reaches 240 ± 10 ℃.
Referring to fig. 3, in the conventional light source regenerating furnace, the temperature of the first temperature zone is difficult to decrease to the target value even if the light intensity is sacrificed (the output power of the LED lamp is reduced), and the furnace temperature of the conventional light source regenerating furnace is 5 to 10 ℃ higher than that of the light source regenerating furnace of the present invention.
The passivated PERC cells of example 2 and comparative example 2 were subjected to light-induced degradation testing under the following conditions: 1000w/m2The treatment is carried out for 5 hours under the condition of illumination and 65 ℃. The specific results are as follows:
in fig. 2 and 3, the abscissa represents furnace temperature data sampling points, and the 20 points are set to 1 second and the ordinate represents the corresponding furnace temperature in degrees celsius, which are set by the furnace temperature tester.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (8)
1. The light source regeneration furnace is characterized by comprising a furnace body, a furnace zone, an illumination system and a cooling system, wherein the furnace zone, the illumination system and the cooling system are arranged in the furnace body;
the air cooling system comprises a first air cooling air pipe, a second air cooling air pipe and a third air cooling air pipe, wherein an air outlet of the first air cooling air pipe is arranged above the first temperature zone furnace zone, an air outlet of the second air cooling air pipe is arranged above the second temperature zone furnace zone, and an air outlet of the third air cooling air pipe is arranged above the third temperature zone furnace zone;
the air exhaust system comprises a first air exhaust pipe, a second air exhaust pipe and a third air exhaust pipe, wherein an air inlet of the first air exhaust pipe is arranged below the first temperature zone furnace zone, an air inlet of the second air exhaust pipe is arranged below the second temperature zone furnace zone, and an air inlet of the third air exhaust pipe is arranged below the third temperature zone furnace zone;
the illumination system irradiates and heats the PERC battery on the furnace belt, the cold air system leads cold air into each temperature zone through a first cold air pipe, a second cold air pipe and a third cold air pipe, and the exhaust system exhausts hot air of each temperature zone through the first exhaust air pipe, the second exhaust air pipe and the third exhaust air pipe so as to accurately control the temperature of each temperature zone;
the PERC battery sequentially passes through the first temperature zone, the second temperature zone and the third temperature zone along with the furnace zone so as to activate a hydrogen dielectric film of the PERC battery and passivate defects and impurities in the PERC battery;
be equipped with dustproof filter screen in first air conditioning tuber pipe, second air conditioning tuber pipe and the third air conditioning tuber pipe, still be equipped with the cooling plate in first air conditioning tuber pipe and the third air conditioning tuber pipe, air conditioning is in proper order through dustproof filter screen and cooling plate, then discharges from the air outlet, and the air conditioning temperature that gets into first air conditioning tuber pipe, second air conditioning tuber pipe and third air conditioning tuber pipe is 15 ~ 20 ℃, and the air conditioning temperature through the cooling plate reduces 3 ~ 8 ℃.
2. The light source regenerating oven as claimed in claim 1, wherein the air intake of each cool air duct is equal to or less than the air discharge of each air discharge duct.
3. The light source regenerating oven as claimed in claim 1, wherein the air inlet amount of each cold air duct is 10 to 30m3Min, the air exhaust volume of each air exhaust duct is 10-40 m3/min。
4. The light source regenerating oven of claim 1, wherein said lighting system includes an upper light source disposed between the air outlet and the oven belt, and the cool air from the air outlet uniformly carries the heat generated by the upper light source to the PERC cell.
5. The light source recycling oven according to claim 4, wherein the upper light source has a light intensity density of 5 to 40kw/m2The temperature of the first temperature zone is 210-270 ℃, the temperature of the second temperature zone is 210-270 ℃, and the temperature of the third temperature zone is 210-270 ℃.
6. The light source regenerating oven as claimed in claim 1, wherein the belt speed of the oven belt is 5 to 9 m/min.
7. A method for reducing efficiency degradation of a PERC cell, wherein the PERC cell is placed in a light source regeneration furnace according to any one of claims 1 to 6 after sintering;
adjusting the air inlet volume of each air conditioning duct to 10-30 m3Min, adjusting the air exhaust volume of each air exhaust duct to be 10-40 m3Min, wherein the air inlet volume of each cold air duct is less than or equal to the air exhaust volume of each air exhaust duct;
adjusting the light intensity density of each temperature zone to be 5-40 kw/m2The temperature of the first temperature zone is 210-270 ℃, the temperature of the second temperature zone is 210-270 ℃, and the temperature of the third temperature zone is 210-270 ℃;
the PERC battery sequentially passes through the first temperature zone, the second temperature zone and the third temperature zone, a hydrogen dielectric film of the PERC battery is activated, and defects and impurities in the PERC battery are passivated.
8. The method of reducing PERC cell efficiency degradation of claim 7, wherein the belt speed of the oven belt is adjusted to 5 to 9 m/min;
after being irradiated by a regenerative furnace, the PERC battery is cooled to room temperature so as to freeze the passivation effect and achieve stability.
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