CN214542269U - Solar cell electrical injection hydrogen passivation device - Google Patents
Solar cell electrical injection hydrogen passivation device Download PDFInfo
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- CN214542269U CN214542269U CN202120594001.9U CN202120594001U CN214542269U CN 214542269 U CN214542269 U CN 214542269U CN 202120594001 U CN202120594001 U CN 202120594001U CN 214542269 U CN214542269 U CN 214542269U
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Abstract
The utility model discloses a solar cell electro-implantation hydrogen passivation device, which is provided with at least one electro-implantation cavity, wherein each electro-implantation cavity comprises a pair of conductive carrier plates (1) connected with an external direct current power supply (7), and an electro-implantation space (2) capable of accommodating a plurality of solar cells (100) is formed between the pair of conductive carrier plates (1); the periphery in electricity injection space (2) is provided with several heating module (5), its characterized in that: the heating module is an infrared heating pipe. The utility model discloses have better electricity injection effect, be particularly useful for the solar cell of TOPCon structure.
Description
Technical Field
The utility model belongs to the technical field of crystalline silicon solar cell hydrogen passivation, concretely relates to solar cell electricity pours into hydrogen passivation device into.
Background
The TOPCon (Tunnel Oxide passivation contact) cell is one of the high-efficiency solar cells acknowledged in the industry, and an excellent passivation contact structure is formed by preparing a layer of ultrathin silicon Oxide layer on the back surface of a silicon wafer, doping phosphorus to form a microcrystalline amorphous mixed Si film, and activating the microcrystalline amorphous mixed Si film through high-temperature annealing.
The hydrogen passivation is used as an important process in the manufacturing of the crystalline silicon battery, and through passivating the internal defects of the crystalline silicon battery, the recombination center is reduced, the conversion efficiency of the photovoltaic battery is effectively improved, the photoinduced attenuation and the heat-assisted attenuation of the crystalline silicon battery are effectively reduced, and the generated energy in the life cycle of a photovoltaic system is improved. In the prior art, in the hydrogen passivation process of the solar cell, the temperature is generally controlled to be about 150-. With the great improvement of the productivity of the screen printing process and the application of large-size batteries, higher requirements are put forward on the productivity and the process stability of hydrogen passivation equipment. The existing hydrogen passivation equipment needs to add more cavities to meet the requirement of mass production, but the excessive assembly line type cavity layout causes the environmental fluctuation of different cavities to directly influence the hydrogen passivation effect; and the normal operation of the whole equipment can be directly influenced when a single cavity has a problem.
For this reason, there is a need for improvements in solar cell passivation processes and apparatus therefor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above problem, a solar cell electricity injection hydrogen passivating device is provided, through the control to the electricity injection process condition, makes solar cell's passivation effect more excellent.
Therefore, the utility model adopts the following technical scheme:
a passivation device for hydrogen by solar battery electric injection is provided with at least one electric injection cavity, wherein each electric injection cavity comprises a pair of conductive carrier plates (1) connected with an external direct current power supply (7), and an electric injection space (2) capable of accommodating a plurality of solar battery pieces (100) is formed between the pair of conductive carrier plates (1); the periphery in electricity injection space (2) is provided with several heating module (5), its characterized in that: the heating module is an infrared heating pipe.
Further, the infrared heating pipes are symmetrically arranged on the periphery of the electric injection cavity.
Further, the infrared heating pipe is arranged at the bottom of two sides of the electric injection cavity.
Further, the electrical injection cavity further comprises a cooling module (6) and a plurality of temperature probes (4).
Further, the cooling module is an air cooling device, the blade or the fan is used for blowing air to blow and blow up and down, and the cooling gas is compressed air, nitrogen or argon.
Furthermore, a plurality of solar cells are stacked in the same direction to form an electrically injected cell (101), heat conducting modules (3) are arranged among the cells, N heat conducting plates (8) are arranged among the cells of the cell at equal intervals, N is larger than or equal to 1, at least one part of each heat conducting plate is located near the center of the cell, at least one tail end of each heat conducting plate extends to the edge of the cell and is provided with thermocouples (9), and the thermocouples are arranged in pairs.
Further, at least one tail end of the heat conduction plate (8) extends to the outside of the battery piece to form a free end, the temperature detector comprises an infrared sensor, and the infrared sensor collects the temperature of the free end of the heat conduction plate.
The heat-conducting plate is arranged between the battery plates in one battery unit, and the heat-conducting plate adopts a metal plate with good heat-conducting property, such as a copper plate; at least one part of the heat conducting plate is located near the center of the battery piece, at least one tail end of the heat conducting plate extends to the edge of the battery piece and can stretch out or not stretch out the edge of the battery piece, and then the temperature of the tail end is detected by the temperature retrieval device to serve as the temperature of the center of the battery piece.
The utility model discloses still through improving the heating module, be that the temperature of electricity injection process is steerable at a relatively higher temperature (more than 200 ℃), make solar wafer obtain better passivation effect. In the conventional electrical injection process, the heating temperature is generally not more than 200 ℃, and is generally between 100 ℃ and 180 ℃. The applicant finds that the solar cell with the TOPCon structure has better passivation effect when the electricity injection is carried out in the high-temperature process of more than 200 ℃, particularly more than 250 ℃. And traditional heating methods, like the heating methods through the metal hot plate that is located electricity injection cavity top and below, can not realize above-mentioned relative high temperature's heating demand, appear easily that the temperature inside the battery unit of piling up is not up to standard, seriously influences the passivation effect and the passivation efficiency of battery piece.
Compared with the prior art, the utility model has the advantages of:
1) has better electric injection effect, and is particularly suitable for a solar cell with a TOPCon structure.
2) The temperature control process is more accurate.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a passivation device for electrically injecting hydrogen into a solar cell according to the present invention;
fig. 2 is a schematic structural view of the heat conducting plate of the present invention;
fig. 3 and 4 are schematic structural diagrams of the heat-conducting plate and the battery unit of the present invention;
in the figure, a conductive carrier plate 1, an electricity injection space 2, a heat conduction module 3, a temperature detector 4, a heating module 5, a cooling module 6, a direct current power supply 7, a heat conduction plate 8, a thermocouple 9, a solar cell 100 and a battery unit 101.
Detailed Description
In order to make the technical field personnel understand the utility model discloses the scheme, will combine the drawing in the embodiment of the utility model below, to the technical scheme in the embodiment of the utility model carries out clear, complete description.
As shown in fig. 1, the present embodiment provides a passivation apparatus for solar cell hydrogen by electrical injection, which has at least one electrical injection cavity, wherein each electrical injection cavity includes a pair of conductive carrier plates 1 connected to an external dc power supply 7, and an electrical injection space 2 capable of accommodating a plurality of solar cells 100 is formed between the pair of conductive carrier plates 1; a plurality of heating modules 5 and cooling modules 6 and a plurality of temperature detectors 4 are arranged on the periphery of the electric injection space 2, wherein the heating modules 5 are infrared heating pipes which are symmetrically arranged on the periphery of the electric injection cavity as shown in fig. 3; the infrared heating pipe can also be arranged at the bottom of the two sides of the electric injection cavity.
As shown in fig. 1 and 3, a plurality of solar cells 100 are stacked in the same direction and connected in series to form an electrically injected cell 101, and a heat conduction module 3 is disposed between the cells. As shown in FIG. 2, N heat-conducting plates 8 are arranged between the battery plates of the battery unit at equal intervals, N is larger than or equal to 1, at least one part of each heat-conducting plate is positioned near the center of the battery plate, and at least one tail end of each heat-conducting plate extends to the edge of the battery plate and is provided with a thermocouple 9. The temperature of the heat conducting plate is collected by the thermocouple on the heat conducting plate to be used as the internal temperature of the battery unit, and the battery unit is accessed to a control system to carry out real-time temperature PID control.
As shown in fig. 4, as an alternative, at least one end of the heat conducting plate 8 extends to the outside of the battery piece to form a free end, the temperature detector includes an infrared sensor, the infrared sensor collects the temperature of the free end of the heat conducting plate as the temperature of the center of the battery piece inside the battery unit, and the temperature detector is connected to the control system for performing real-time PID control of the temperature.
The cooling module is an air cooling device, blowing is carried out by adopting blades or fans for blowing air up and down, and cooling gas is compressed air, nitrogen or argon.
When the passivation device for the solar cell electric injection hydrogen is used for carrying out electric injection hydrogen passivation on the solar cell, the steps are as follows:
s1, stacking a plurality of solar battery pieces 100 in the same direction to form an electrically injected battery unit 101;
s2, placing a plurality of battery units 101 together in an electric injection space 2 of an electric injection cavity, wherein a heat conduction module 3 is arranged between the battery units, and the heat conduction module 3 has the functions of electric conduction and heat conduction;
s3, loading 15-30A current to each battery unit, and simultaneously, operating the heating module to enable the temperature in the cavity to rise and be controlled between 200 ℃ and 400 ℃ for 30-180 min; the heating module is an infrared heating pipe, and the heating mode is infrared heating; the infrared heating pipes can be arranged on two sides or the periphery of the electric injection cavity body, symmetrically arranged or arranged at approximately equal intervals, so that a more uniform heating effect is achieved. In this step, the temperature is preferably 250-400 ℃ and the duration is preferably 60-150min, the temperature is further preferably 250-350 ℃ and the duration is further preferably 80-100 min.
And S4, stopping heating, and enabling the cooling module to work to cool the temperature in the electric injection cavity to room temperature.
In order to obtain a more stable temperature environment during the electro-injection process, precise temperature measurement and control of the electro-injection process are required. Since the cells are stacked during the electro-injection process, the temperature at the edge of the cell is different from the temperature at the center of the cell (especially, the cell located at the middle of the stack of cells), and in order to obtain precise temperature control, the temperature at the center of the cell needs to be obtained first.
In this embodiment, PID is used for temperature control. In order to obtain the temperature of the central position of the battery piece, N heat conduction plates 8 are arranged among the battery pieces of each battery unit 101 at equal intervals, N is larger than or equal to 1, and the heat conduction plates 8 are metal plates with good heat conduction performance, such as copper plates; the value of N can be determined according to the number of battery pieces in a battery unit, and generally speaking, a heat-conducting plate is arranged between every 30-50 battery pieces. Such as: in a stack of 100 battery cells, 1-2 heat-conducting plates can be provided, the 1-2 heat-conducting plates approximately equally dividing the battery cells in one battery cell in the longitudinal height.
At least a portion of the heat conductive plate 8 is located near the center of the cell, and at least one end of the heat conductive plate extends to the edge of the cell and is provided with a thermocouple 8 at the end. The thermocouples are arranged in pairs, and specifically, two thermocouples 9 may be embedded at an edge position on the heat conducting plate 8, as shown in fig. 2; the thermocouples are respectively connected with the corresponding electrode units, each electrode unit comprises an upper electrode group and a lower electrode group which are suitable for forming a loop after being connected, and the upper electrode group comprises two upper electrodes; the lower electrode group comprises two lower electrodes, namely each two upper electrodes and each two lower electrodes correspond to a thermocouple, a group of loops are formed after the lower electrode group is connected, current signals are generated, and the lower electrode group is connected to a control system, so that real-time temperature PID control can be performed.
As shown in fig. 2, the heat conductive plate may be disposed in parallel with the plane (front or rear) of the battery cell. The heat conducting plate can be a plate, and the area size of the heat conducting plate is equal to the area size of the battery piece or slightly smaller than or slightly larger than the area size of the battery piece; the heat-conducting plate can be cubic, or other irregular shapes, as long as partly contact the center of battery piece of heat-conducting plate in principle, another part is located near battery piece edge and can realize the utility model discloses a purpose.
Adopt the utility model discloses a solar cell electricity pours into hydrogen passivating device into, can make the temperature control process more accurate.
The five-point temperature distribution in the solar cell 100 is obtained by testing the thermocouple randomly clamped between the cells, and after the heat-conducting plate 8 is added, the results of the five-point temperature distribution in the solar cell and the temperature distribution without the heat-conducting plate are shown in the following table 1, and it can be seen that the uniformity of the temperature distribution in the solar cell is obviously improved.
Table 1: five point temperature distribution in solar cell
Meanwhile, the passivation method and the device for the solar cell by the hydrogen electro-injection have better electro-injection effect, and are particularly suitable for the solar cell with the TOPCon structure; on the other hand, the time of the electric injection process can be shortened, and the hydrogen passivation efficiency can be improved. Under the condition of approximately equal process time, the battery piece has better hydrogen passivation effect and obviously improves the longitudinal attenuation uniformity by adopting the relatively high-temperature process environment of the utility model; meanwhile, the time of electric injection can be shortened, and the production efficiency is improved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein will be apparent to those skilled in the art without departing from the spirit of the invention.
Claims (7)
1. A passivation device for hydrogen by solar battery electric injection is provided with at least one electric injection cavity, wherein each electric injection cavity comprises a pair of conductive carrier plates (1) connected with an external direct current power supply (7), and an electric injection space (2) capable of accommodating a plurality of solar battery pieces (100) is formed between the pair of conductive carrier plates (1); the periphery in electricity injection space (2) is provided with several heating module (5), its characterized in that: the heating module is an infrared heating pipe.
2. The solar cell electrical injection hydrogen passivation apparatus of claim 1, characterized in that: the infrared heating pipes are symmetrically arranged on the periphery of the electric injection cavity.
3. The solar cell electrical injection hydrogen passivation apparatus of claim 2, characterized in that: the infrared heating pipe is arranged at the bottom of the two sides of the electric injection cavity.
4. The solar cell electrical injection hydrogen passivation apparatus of claim 1, characterized in that: the electrical injection cavity further comprises a cooling module (6), and a plurality of temperature probes (4).
5. The solar cell electrical injection hydrogen passivation apparatus of claim 4, characterized in that: the cooling module is an air cooling device, blowing is carried out by adopting blades or fans for blowing air up and down, and cooling gas is compressed air, nitrogen or argon.
6. The solar cell electrical injection hydrogen passivation apparatus of claim 4, characterized in that: the solar cell comprises a plurality of solar cells, wherein the solar cells are stacked in the same direction to form an electrically-injected cell unit (101), a heat conduction module (3) is arranged between the cell units, N heat conduction plates (8) are arranged among the cells of the cell unit at equal intervals, N is larger than or equal to 1, at least one part of each heat conduction plate is located near the center of the cell, at least one tail end of each heat conduction plate extends to the edge of the cell and is provided with thermocouples (9), and the thermocouples are arranged in pairs.
7. The solar cell electrical injection hydrogen passivation apparatus of claim 6, characterized in that: the outside formation free end that at least one end of heat-conducting plate (8) extended to the battery piece, temperature detector includes infrared sensor, and infrared sensor gathers the temperature of heat-conducting plate free end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120594001.9U CN214542269U (en) | 2021-03-23 | 2021-03-23 | Solar cell electrical injection hydrogen passivation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120594001.9U CN214542269U (en) | 2021-03-23 | 2021-03-23 | Solar cell electrical injection hydrogen passivation device |
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| CN214542269U true CN214542269U (en) | 2021-10-29 |
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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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2021
- 2021-03-23 CN CN202120594001.9U patent/CN214542269U/en active Active
Cited By (2)
| 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 |
| CN114122196B (en) * | 2021-11-25 | 2023-07-21 | 通威太阳能(眉山)有限公司 | Electric injection method of crystalline silicon solar cell |
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