CN113130700A - Electric injection method and device of solar cell and electric injection equipment - Google Patents
Electric injection method and device of solar cell and electric injection equipment Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 166
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Abstract
According to the method and the device for electric injection of the solar cell and the electric injection equipment, provided by the embodiment of the invention, the number of the solar cells in the stacking structure of the solar cells to be subjected to electric injection is obtained; controlling a power supply for performing electric injection to provide a first preset current for a stacking structure of the solar battery pieces according to the number of the solar battery pieces, wherein the voltage on the solar battery pieces is smaller than the conducting voltage of the solar battery pieces under the first preset current; when the temperature of the stacked structure of the solar cell reaches a first preset temperature, the power supply is controlled to provide a second preset current for the stacked structure of the solar cell, so that the stacked structure of the solar cell is subjected to current injection under the second preset current, and the second preset current is greater than the first preset current. According to the embodiment of the invention, the electricity injection efficiency and the yield of the solar cell can be improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of device preparation, in particular to an electric injection method and device of a solar cell and electric injection equipment.
Background
The Light Induced Degradation (LID) phenomenon refers to a phenomenon that power of a solar cell and a photovoltaic module is attenuated when the solar cell and the photovoltaic module are illuminated by Light. The power attenuation can directly reduce the power generation amount of the photovoltaic module, and when the power attenuation exceeds a certain range, the photovoltaic module can have larger power generation amount fluctuation when a photovoltaic power station operates.
Eyes of a userIn the former process, the electric injection process is a key process for passivating the defects in the solar cell and improving the attenuation resistance of the solar cell. In order to reduce the influence caused by the LID phenomenon, the electric injection mode can be adopted to inject carriers into the cell slice so as to realize hydrogen passivation. In the prior art, in order to realize large-scale production, battery pieces are stacked for batch processing during electric injection. Because the on-state voltage of the single battery is about the open-circuit voltage at room temperature, when the batch processed battery slices are 400, the power supply voltage provided by the power supply box is required to reach 300V; when the number of the battery pieces processed in batch is 600, the power supply voltage provided by the power supply box is required to reach 500V. Thus, when more battery pieces need to be processed in batch, the power supply voltage provided by the power supply box is higher, which increases the cost of the electric injection device; or, when the power supply voltage provided by the power supply box is a certain value, only a few battery pieces can be processed, which affects the production efficiency.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an electrical injection method and apparatus for a solar cell, and an electrical injection device, which can improve the efficiency of electrical injection of a solar cell and the yield of a product.
In a first aspect, an embodiment of the present invention provides an electrical injection method for a solar cell, including:
acquiring the number of solar cells in a stacking structure of the solar cells to be subjected to electrical injection;
controlling a power supply for performing electric injection to provide a first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; under the first preset current, the voltage of the solar cell is smaller than the breakover voltage of the solar cell;
when the temperature of the stacking structure of the solar cell reaches a first preset temperature, controlling the power supply to provide a second preset current for the stacking structure of the solar cell, so that the stacking structure of the solar cell is subjected to current injection under the second preset current; wherein the second preset current is greater than the first preset current.
Optionally, before the controlling the power source for performing the electrical injection to provide the first preset current to the stacked structure of the solar cell, the method further includes:
controlling the power supply to provide a third preset current for the stacking structure of the solar cell piece so as to preheat the stacking structure of the solar cell piece for a preset time; the first preset current is greater than or equal to the third preset current.
Optionally, the value range of the preset time t is as follows: t is more than or equal to 3min and less than or equal to 10 min.
Optionally, the electrical injection method further includes:
and when the temperature of the stacking structure of the solar cell reaches a second preset temperature, controlling the stacking structure of the solar cell to perform electric injection at the second preset temperature and the second preset current.
Optionally, the value range of the second preset temperature T is greater than or equal to 150 ℃ and less than or equal to T2 and less than or equal to 300 ℃.
Optionally, the voltage of the power supply is 300V;
the stacking structure of the solar cell comprises N solar cells; wherein N is more than or equal to 300 and less than or equal to 600;
the value range of the first preset current I1 is as follows: i1 is more than or equal to 0.5A and less than or equal to 15A; the first preset temperature T1 is greater than or equal to 120 ℃.
In a second aspect, an embodiment of the present invention further provides an electrical injection device for a solar cell, including:
the quantity acquisition module is used for acquiring the quantity of the solar cells in the stacking structure of the solar cells to be subjected to electric injection;
the first preset current providing module is used for controlling a power supply for performing electric injection to provide first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; under the first preset current, the voltage of the solar cell is smaller than the breakover voltage of the solar cell;
the second preset current providing module is used for controlling the power supply to provide a second preset current for the stacking structure of the solar cell piece when the temperature of the stacking structure of the solar cell piece reaches a first preset temperature, so that the stacking structure of the solar cell piece is subjected to current injection under the second preset current; wherein the second preset current is greater than the first preset current.
Optionally, the electrical injection apparatus further comprises:
the third preset current providing module is used for controlling a power supply to provide third preset current for the stacked structure of the solar cell piece before the power supply for controlling the electrical injection provides the first preset current for the stacked structure of the solar cell piece so as to preheat the stacked structure of the solar cell piece for preset time; the first preset current is greater than or equal to the third preset current.
Optionally, the electrical injection apparatus further comprises:
and the electric injection control module is used for controlling the stacking structure of the solar cell piece to be in electric injection under the second preset temperature and the second preset current when the temperature of the stacking structure of the solar cell piece reaches the second preset temperature.
Optionally, the voltage of the power supply is 300V;
the stacking structure of the solar cell comprises N solar cells; wherein N is more than or equal to 300 and less than or equal to 600;
the value range of the first preset current I1 is as follows: i1 is more than or equal to 0.5A and less than or equal to 15A; the first preset temperature T1 is greater than or equal to 120 ℃.
In a third aspect, the present invention also provides an electrical injection apparatus, including the electrical injection device for a solar cell.
According to the electric injection method, the device and the electric injection equipment for the solar cell, the electric injection method controls the power supply for electric injection to provide a first preset current for the stacking structure of the solar cell according to the number of the solar cells in the stacking structure of the solar cell, and the conducting voltage of the solar cell is smaller than the open-circuit voltage of the solar cell under the first preset current, so that the phenomenon of failure caused by the fact that the power supply for electric injection cannot meet the electric injection requirements of more solar cells due to the fact that the number of the solar cells is large is avoided; after the first preset current is provided for the stacking structure of the solar cell, the temperature of each solar cell gradually rises, so that the open-circuit voltage of each solar cell is reduced, and the power supply for electric injection can meet the requirement of the open-circuit voltage of each solar cell in the stacking structure of the solar cell until the temperature of the stacking structure of the solar cell reaches the first preset temperature, and at the moment, the power supply is controlled to provide the second preset current for the stacking structure of the solar cell, and the second preset current is greater than the first preset current, so that the stacking structure of the solar cell is subjected to electric injection under the second preset current. Therefore, the current is applied to the stacked structure of the solar cell in stages, so that the temperature of the stacked structure of the solar cell is raised under the first preset current, the open-circuit voltage of each solar cell in the stacked structure of the solar cell is reduced, and the current injection is carried out under the second preset current, so that the smaller power supply can meet the requirement of the current injection of each solar cell in the stacked structure of the solar cell, the power consumption of the current injection is reduced on the basis of carrying out the current injection on more solar cells, and the efficiency of the current injection is improved; meanwhile, different currents are applied to the stacking structure of the solar cell in a segmented manner, so that the uniformity of electric injection can be improved, the conversion efficiency of the solar cell is improved, and the attenuation rate of the solar cell is reduced.
Drawings
Fig. 1 is a flowchart of an electrical injection method for a solar cell according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an I-V curve structure of a solar cell provided in an embodiment of the present invention;
fig. 3 is a flowchart of an electric injection method for a solar cell according to another embodiment of the present invention;
FIG. 4 is a graph of temperature versus time for a solar cell according to an embodiment of the present invention;
FIG. 5 is a graph comparing percent conversion efficiency improvement provided by practice of the present invention;
FIG. 6 is a graph comparing percent efficiency decay provided by embodiments of the present invention;
FIG. 7 is a flow chart of a method for injecting electricity into a solar cell according to another embodiment of the present invention;
FIG. 8 is a block diagram of an electrical injection apparatus according to an embodiment of the present invention;
fig. 9 is a block diagram illustrating an electrical injection apparatus for a solar cell according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electrical injection apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides an electric injection method of a solar cell, which can be suitable for injecting excess carriers into a solar cell slice so as to improve the attenuation phenomenon of the solar cell. The electric injection method can be executed by an electric injection device of the solar cell provided by the embodiment of the invention, the device can be realized in a software and/or hardware manner, and the device can be integrated in an electric injection device. Fig. 1 is a flowchart of an electrical injection method for a solar cell according to an embodiment of the present invention. As shown in fig. 1, the electrical injection method includes:
s110, acquiring the number of the solar cells in the stacking structure of the solar cells to be subjected to electric injection.
Specifically, in order to realize mass production, solar cells are generally stacked for batch processing during the electric injection. The stacking structure of the solar cell is a structure that a plurality of solar cells are stacked together, so that the solar cells in the stacking structure of the solar cells are connected in series, and at the moment, the power supply of the electric injection device can provide current required by electric injection to two ends of the stacking structure of the solar cells through the upper electrode and the lower electrode in the power-on cavity of the electric injection device, so that the solar cells are conducted.
S120, controlling a power supply for performing electric injection to provide a first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; and the voltage of the solar cell is lower than the breakover voltage of the solar cell under the first preset current.
Specifically, the more the number of the solar cells in the stacked structure of the solar cells, the higher the requirement on the voltage of the power supply, that is, when the stacked structure of the solar cells includes N solar cells, and the open circuit voltage of each solar cell at room temperature is U0When the voltage V of the power supply required for performing the electric injection at room temperature is equal to or greater than U0xN if the voltage V of the power supply is less than U0Xn, the solar cell in the stacked structure of the solar cell cannot be conducted, and the stacked structure of the solar cell cannot be electrically injected. In order to enable the power supply with smaller voltage to electrically inject the stacked structure comprising more solar cells, after the number of the solar cells is determined, the power supply can be controlled to provide a first preset current which is smaller than the current required by the breakover voltage of the stacked structure of the solar cells, so that the temperature of the stacked structure of the solar cells is increased under the first preset current, and the breakover voltage of each solar cell in the stacked structure of the solar cells is reduced.
For example, fig. 2 is a schematic diagram of an I-V curve structure of a solar cell provided in an embodiment of the present invention. As shown in fig. 2, the current of the solar cell changes faster with the voltage at high temperature, and the current of the solar cell changes slower with the voltage at room temperature. For example, when a current of 10A is supplied to the solar cell, the on-voltage of the solar cell at high temperature is less than 0.7V, and the on-voltage of the solar cell at room temperature is equal to 0.7V. Therefore, the temperature of the solar cell can be raised by providing a smaller first preset current and under the heating effect of the first preset current, so as to reduce the on-state voltage of the solar cell.
The voltage of the power supply for performing electric injection can be 300V, and when the number N of the solar cells included in the stacked structure of the solar cells is within a value range of 300-600, the value range of the first preset current I1 provided for the stacked structure of the solar cells is 0.5A-15A.
S130, when the temperature of the stacking structure of the solar cell reaches a first preset temperature, controlling a power supply to provide a second preset current for the stacking structure of the solar cell so as to enable the stacking structure of the solar cell to perform current injection under the second preset current; wherein, the second preset current is larger than the first preset current.
Specifically, when a first preset current is applied to the stacked structure of the solar cells due to the heating effect of the current, the temperature of each solar cell is increased. When the temperature of the solar cell is increased to the first preset temperature T1, the turn-on voltage of the solar cell is decreased to a range that can be satisfied by the power supply voltage, and at this time, a second preset current that can satisfy the turn-on requirement of the solar cell is supplied to the stacked structure of the solar cell, so that the solar cell can be electrically injected under the second preset current. Therefore, each solar cell subjected to electric injection can be ensured to be in a normal conduction state, and the electric injection effect is improved. The first preset temperature T1 may be, for example, 120 ℃ or greater than 120 ℃.
In the embodiment, the current is applied to the stacked structure of the solar cell in stages, so that the temperature of the stacked structure of the solar cell is raised under the first preset current to reduce the open-circuit voltage of each solar cell in the stacked structure of the solar cell, and the current injection is performed under the second preset current, so that a smaller power supply can meet the requirement of the current injection of each solar cell in the stacked structure of the solar cell, thereby reducing the power consumption of the current injection and improving the efficiency of the current injection on the basis of performing the current injection on more solar cells; meanwhile, different currents are applied to the stacking structure of the solar cell in a segmented manner, so that the uniformity of electric injection can be improved, the conversion efficiency of the solar cell is improved, and the attenuation rate of the solar cell is reduced.
It should be noted that the above is only an exemplary illustration of the embodiment of the present invention, and the above is to provide the corresponding preset current to the stacked structure of the solar cell in two stages; in the embodiment of the present invention, the current may also be provided in multiple stages to gradually increase the temperature of the solar cell to the first predetermined temperature, and the technical principle of the embodiment of the present invention is similar to that of the two stages described above, which is not described again.
Optionally, before the first preset current is provided to the stacked structure of the solar cell, a third preset current may be provided to the stacked structure of the solar cell to preheat the stacked structure of the solar cell. Fig. 3 is a flowchart of an electrical injection method for a solar cell according to another embodiment of the present invention. As shown in fig. 3, the electrical injection method includes:
s210, acquiring the number of solar cells in a stacking structure of the solar cells to be subjected to electric injection;
s220, controlling a power supply to provide a third preset current for the stacking structure of the solar cell piece so as to preheat the stacking structure of the solar cell piece for a preset time; the first preset current is greater than or equal to a third preset current;
s230, controlling a power supply for performing electric injection to provide a first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; the on-state voltage of the solar cell is smaller than the open-circuit voltage of the solar cell under the first preset current;
s240, when the temperature of the stacking structure of the solar cell reaches a first preset temperature, controlling a power supply to provide a second preset current for the stacking structure of the solar cell so as to enable the stacking structure of the solar cell to perform current injection under the second preset current; the second preset current is larger than the first preset current.
Specifically, before the first preset current is provided to the stacked structure of the solar cell, a third preset current may be provided to the solar cell, and after the third preset current is provided to the solar cell for a preset time, the temperature of the stacked structure of the solar cell is higher than the room temperature due to the heating effect of the third preset current, so as to reduce the open-circuit voltage of the solar cell. At the moment, the first preset current is provided for the stacking structure of the solar cell, so that the heating speed of the solar cell under the first preset current can be increased, the first preset temperature can be quickly reached, and the efficiency and the yield of electric injection are further improved. The value range of the preset time t for providing the third preset current for the stacked structure of the solar cell is more than or equal to 3min and less than or equal to 10 min.
For example, fig. 4 is a graph of temperature versus time of a solar cell provided by an embodiment of the present invention; FIG. 5 is a graph comparing percent conversion efficiency improvement provided by practice of the present invention; FIG. 6 is a graph comparing percent efficiency decay provided by embodiments of the present invention. As shown in fig. 4, if the on-state voltage of the solar cell is 0.7V at room temperature, and the voltage of the power supply is 300V, and 600 solar cells are included in the stacked structure of the solar cells, the power supply voltage required for turning on the 600 solar cells is at least 420V, and the power supply of 300V cannot perform electric injection on the 600 solar cells. The current is supplied to the stacking structure of the solar cells in three stages, so that the temperature of the solar cells is gradually increased, the conduction voltage is gradually reduced, and 600 solar cells can be subjected to electric injection by adopting a 300V power supply. The third preset current I3 provided to the stacked structure of the solar cell in the first stage may be 1A, and the third preset current I3 of 1A is maintained to electrify the stacked structure of the solar cell for 10min, so that the temperature of the solar cell can be increased to above 50 ℃, and the temperature increase rate is slow because the provided third preset current is small; at this time, the 300V power supply still cannot meet the requirement of the on-state voltage of 600 solar cells, a first preset current I1 is provided to the stacked structure of the solar cells at the second stage, the first preset current I1 may be 4A, for example, and the 4A first preset current I1 is maintained to electrify the stacked structure of the solar cells for 6min, the temperature of the solar cells is increased to 120 ℃, and the on-state voltage of the solar cells can be reduced to 0.5V at this time; at the moment, the 300V power supply can meet the conduction voltage of 600 solar cells; and in the third stage, current of 10A is supplied to the stacked structure of the solar cells, so that each solar cell in the stacked structure of the solar cells can be conducted, and the electric injection of each solar cell is realized. If the prior art electric injection method is adopted, the power supply of 300V can only meet the electric injection requirement of the solar cell of 400 solar cells.
As shown in fig. 5, after 400 solar cells are electrically injected by a 300V power supply through the prior art electrical injection method, the conversion efficiency of the solar cells can be improved by only 0.11%; by adopting the electric injection method provided by the embodiment of the invention, after 600 solar cells are subjected to electric injection by adopting 300V voltage, the conversion efficiency of the solar cells can be improved by 0.13%; therefore, compared with the prior art, the electric injection method provided by the embodiment of the invention can be used for carrying out electric injection on more solar cells by adopting the same power supply voltage, and can ensure that the solar cells have higher conversion efficiency.
As shown in fig. 6, after 400 solar cells are electrically injected by a 300V power supply through the prior art electrical injection method, the ratio of the efficiency attenuation of the solar cells to the original efficiency attenuation is-0.39%; by adopting the electric injection method provided by the embodiment of the invention, after 600 solar cells are subjected to electric injection by adopting the voltage of 300V, the ratio of the efficiency attenuation of the solar cells to the original efficiency attenuation is-0.32%; therefore, compared with the prior art, the electric injection method provided by the embodiment of the invention can be used for carrying out electric injection on more solar cells by adopting the same power supply voltage, and can improve the efficiency attenuation phenomenon of the solar cells.
Optionally, due to a heating effect of the current, the temperature of the stacked structure of the solar cell piece may continuously increase at the second preset current, and when the temperature of the solar cell reaches the maximum process temperature, the temperature of the solar cell may be stopped, so that the solar cell continues to perform the electrical injection at the temperature. Fig. 7 is a flowchart of an electrical injection method for a solar cell according to another embodiment of the present invention. As shown in fig. 7, the electrical injection method includes:
s310, acquiring the number of solar cells in a stacking structure of the solar cells to be subjected to electric injection;
s320, controlling a power supply for performing electric injection to provide a first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; the on-state voltage of the solar cell is smaller than the open-circuit voltage of the solar cell under the first preset current;
s330, when the temperature of the stacking structure of the solar cell reaches a first preset temperature, controlling a power supply to provide a second preset current for the stacking structure of the solar cell so as to enable the stacking structure of the solar cell to perform current injection under the second preset current; the second preset current is larger than the first preset current;
s340, when the temperature of the stacked structure of the solar cell reaches a second preset temperature, controlling the stacked structure of the solar cell to perform electric injection at the second preset temperature and a second preset current.
Specifically, the second preset current is continuously supplied to the stacked structure of the solar cell when the electric injection is performed. When the second preset current is continuously supplied to the stacked structure of the solar cells by the heating effect of the current, the temperature of each solar cell is continuously increased. Although the continuous temperature rise can cause the turn-on voltage of the solar cell to be reduced to a certain extent, when the temperature exceeds the process temperature, the solar cell can be irreversibly damaged. Therefore, when the temperature of the stacked structure of the solar cell reaches the second preset temperature, the temperature of the solar cell can be maintained at the second preset temperature through ventilation cooling and the like, so that the irreversible damage to the solar cell after the second preset temperature is exceeded is prevented. The process temperature of the solar cell can be 250 ℃, the value range of the second preset temperature T2 can be more than or equal to 150 ℃ and less than or equal to T2 and less than or equal to 300 ℃, and under the temperature range, the solar cell can be prevented from being irreversibly damaged due to overhigh temperature while the solar cell has lower open-circuit voltage, and the solar cell can be ensured to have higher conversion efficiency and lower attenuation rate.
The embodiment of the invention also provides an electric injection device of the solar cell, the electric injection device is used for executing the electric injection method of the solar cell provided by the embodiment of the invention, the electric injection device can be realized in a software and/or hardware mode, and the electric injection device can be integrated in an electric injection device. Fig. 8 is a block diagram of an electrical injection apparatus according to an embodiment of the present invention. As shown in fig. 8, the solar cell electric injection apparatus 10 includes: the device comprises a quantity acquisition module 11, a first preset current providing module 12 and a second preset current providing module 13.
The quantity acquisition module 11 is used for acquiring the quantity of the solar cells in the stacked structure of the solar cells to be subjected to electrical injection; the first preset current providing module 12 is configured to control a power supply for performing electrical injection to provide a first preset current to the stacked structure of the solar cells according to the number of the solar cells; the on-state voltage of the solar cell is smaller than the open-circuit voltage of the solar cell under the first preset current; the second preset current providing module 13 is configured to control the power supply to provide a second preset current to the stacked structure of the solar cell when the temperature of the stacked structure of the solar cell reaches a first preset temperature, so that the stacked structure of the solar cell is subjected to current injection at the second preset current; the second preset current is larger than the first preset current.
In the embodiment, the current is applied to the stacked structure of the solar cell in stages, so that the temperature of the stacked structure of the solar cell is raised under the first preset current to reduce the open-circuit voltage of each solar cell in the stacked structure of the solar cell, and the current injection is performed under the second preset current, so that a smaller power supply can meet the requirement of the current injection of each solar cell in the stacked structure of the solar cell, thereby reducing the power consumption of the current injection and improving the efficiency of the current injection on the basis of performing the current injection on more solar cells; meanwhile, different currents are applied to the stacking structure of the solar cell in a segmented manner, so that the uniformity of electric injection can be improved, the conversion efficiency of the solar cell is improved, and the attenuation rate of the solar cell is reduced.
Optionally, fig. 9 is a block diagram of a structure of an electric injection device for a solar cell according to another embodiment of the present invention. As shown in fig. 9, the solar cell electric injection apparatus 10 further includes a third preset current providing 14 module; the third preset current providing 14 module is used for controlling the power supply to provide a third preset current to the stacked structure of the solar cell piece before controlling the power supply for electrical injection to provide the first preset current to the stacked structure of the solar cell piece so as to preheat the stacked structure of the solar cell piece for a preset time; the first preset current is greater than or equal to the third preset current.
Optionally, with continued reference to fig. 9, the solar cell electrical injection apparatus 10 further includes an electrical injection control module 15; the electric injection control module 15 is configured to control the stacked structure of the solar cell to perform electric injection at a second preset temperature and a second preset current when the temperature of the stacked structure of the solar cell reaches the second preset temperature.
Optionally, the voltage of the power supply provided by the power supply box for performing electrical injection may be 300V; the stacking structure of the solar cell for performing electric injection comprises N solar cells; wherein N is more than or equal to 300 and less than or equal to 600; the value range of the first preset current I1 is as follows: i1 is more than or equal to 0.5A and less than or equal to 15A; the first preset temperature T1 is greater than or equal to 120 ℃.
The solar cell electrical injection device provided in the embodiments of the present invention is used to execute the solar cell electrical injection method provided in each of the embodiments, and the technical principle and the generated technical effect are similar, so that reference may be made to the above description of the solar cell electrical injection method, and details are not repeated here.
The embodiment of the present invention further provides an electrical injection apparatus, and the electrical injection apparatus includes the electrical injection device for a solar cell provided in the embodiment of the present invention, and the electrical injection device for a solar cell may be used to execute the electrical injection method for a solar cell provided in the embodiment of the present invention, so that the electrical injection apparatus provided in the embodiment of the present invention also has the beneficial effects of the electrical injection method for a solar cell provided in the embodiment of the present invention, which may be specifically referred to the description of the electrical injection method for a solar cell, and is not described herein again.
Fig. 10 is a schematic structural diagram of an electrical injection apparatus according to an embodiment of the present invention. As shown in fig. 10, the electrical injection apparatus 100 at least includes an electrical injection device 10 of a solar cell provided in an embodiment of the present invention; the electrical infusion device 100 may also include a power supply box, a plurality of energized chambers (not shown), and the like. The stacked structure of the solar cells can be placed in the power-on cavity for electric injection, and the power box can provide the current required by the electric injection of the solar cells.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. An electrical injection method for a solar cell, comprising:
acquiring the number of solar cells in a stacking structure of the solar cells to be subjected to electrical injection;
controlling a power supply for performing electric injection to provide a first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; under the first preset current, the voltage of the solar cell is smaller than the breakover voltage of the solar cell;
when the temperature of the stacking structure of the solar cell reaches a first preset temperature, controlling the power supply to provide a second preset current for the stacking structure of the solar cell, so that the stacking structure of the solar cell is subjected to current injection under the second preset current; wherein the second preset current is greater than the first preset current.
2. The method according to claim 1, further comprising, before controlling a power source for performing electric injection to supply a first preset current to the stacked structure of solar cells:
controlling the power supply to provide a third preset current for the stacking structure of the solar cell piece so as to preheat the stacking structure of the solar cell piece for a preset time; the first preset current is greater than or equal to the third preset current.
3. The method according to claim 2, wherein the preset time t is in a range of: t is more than or equal to 3min and less than or equal to 10 min.
4. The method of claim 1, further comprising:
and when the temperature of the stacking structure of the solar cell reaches a second preset temperature, controlling the stacking structure of the solar cell to perform electric injection at the second preset temperature and the second preset current.
5. The method of claim 4, wherein the second predetermined temperature T2 is in the range of 150 ℃ to T2 to 300 ℃.
6. An electrical injection method according to any of claims 1 to 5, wherein the voltage of the power supply is 300V;
the stacking structure of the solar cell comprises N solar cells; wherein N is more than or equal to 300 and less than or equal to 600;
the value range of the first preset current I1 is as follows: i1 is more than or equal to 0.5A and less than or equal to 15A; the first preset temperature T1 is greater than or equal to 120 ℃.
7. An electrical injection apparatus for a solar cell, comprising:
the quantity acquisition module is used for acquiring the quantity of the solar cells in the stacking structure of the solar cells to be subjected to electric injection;
the first preset current providing module is used for controlling a power supply for performing electric injection to provide first preset current for the stacking structure of the solar battery pieces according to the number of the solar battery pieces; under the first preset current, the voltage of the solar cell is smaller than the breakover voltage of the solar cell;
the second preset current providing module is used for controlling the power supply to provide a second preset current for the stacking structure of the solar cell piece when the temperature of the stacking structure of the solar cell piece reaches a first preset temperature, so that the stacking structure of the solar cell piece is subjected to current injection under the second preset current; wherein the second preset current is greater than the first preset current.
8. The electrical infusion device of claim 7, further comprising:
the third preset current providing module is used for controlling a power supply to provide third preset current for the stacked structure of the solar cell piece before the power supply for controlling the electrical injection provides the first preset current for the stacked structure of the solar cell piece so as to preheat the stacked structure of the solar cell piece for preset time; the first preset current is greater than or equal to the third preset current.
9. The electrical infusion device of claim 7, further comprising:
and the electric injection control module is used for controlling the stacking structure of the solar cell piece to be in electric injection under the second preset temperature and the second preset current when the temperature of the stacking structure of the solar cell piece reaches the second preset temperature.
10. An electrical injection apparatus according to any of claims 7 to 9, wherein the voltage of the power supply is 300V;
the stacking structure of the solar cell comprises N solar cells; wherein N is more than or equal to 300 and less than or equal to 600;
the value range of the first preset current I1 is as follows: i1 is more than or equal to 0.5A and less than or equal to 15A; the first preset temperature T1 is greater than or equal to 120 ℃.
11. An electro-implantation device, comprising: an electrical injection device for a solar cell according to any one of claims 7 to 10.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114122196A (en) * | 2021-11-25 | 2022-03-01 | 通威太阳能(眉山)有限公司 | Electric injection method of crystalline silicon solar cell |
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| CN105789382A (en) * | 2016-05-20 | 2016-07-20 | 浙江晶科能源有限公司 | Method for improving light degradation of boron-doped crystalline silicon solar cell |
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| CN108550656A (en) * | 2018-05-17 | 2018-09-18 | 苏州晶洲装备科技有限公司 | A kind of electrical pumping equilibrium annealing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114122196A (en) * | 2021-11-25 | 2022-03-01 | 通威太阳能(眉山)有限公司 | Electric injection method of crystalline silicon solar cell |
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