Photovoltaic cell performance test method and device

Abstract

The invention provides a photovoltaic cell performance test method and device, and belongs to the technical field of photovoltaic cells, and the device comprises a test box, a thimble test frame and an ultraviolet lamp. A substrate for supporting a to-be-tested battery piece is arranged in the test box, packaging glass is arranged above the substrate, and a packaging adhesive film is arranged on the lower surface, facing the to-be-tested battery piece, of the packaging glass; a vacuum suction hole is formed in the base plate; the vacuum suction holes are communicated with a vacuum pump through vacuum suction pipes. The ejector pin test frame is positioned below the substrate; the ejector pin testing frame comprises a supporting plate, a positive ejector pin, a negative ejector pin and a lifting support, and the anode and cathode thimbles are in one-to-one correspondence with anodes and cathodes on the back of the to-be-tested battery piece so as to short-circuit the anodes and cathodes of the to-be-tested battery piece. The ultraviolet lamp is arranged above the packaging glass so as to penetrate through the packaging glass and the packaging adhesive film to irradiate the battery piece to be detected. The battery piece does not need to be made into a photovoltaic module, and the test cost is reduced; and the anti-UV performance of the BC battery can be obtained more accurately.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic cells, and particularly relates to a method and device for testing the performance of photovoltaic cells. Background Art

[0002] BC cells generally refer to back contact cells, which have a relatively high theoretical limit efficiency and are one of the development directions of current high-efficiency photovoltaic modules. However, BC cells are relatively sensitive to ultraviolet (UV) light. Evaluating the attenuation of BC cells under UV light is closely related to the quality assurance of photovoltaic modules made of BC cells. Therefore, it is quite necessary to evaluate the attenuation of BC cells under UV light.

[0003] According to the IEC standard, the current method for evaluating the attenuation of BC cells under UV light is as follows: after short-circuiting the photovoltaic module in a UV aging chamber, the photovoltaic module is irradiated with UV light, and based on this, the UV attenuation of the photovoltaic module is evaluated. However, this method requires manufacturing the BC cells into photovoltaic modules, so the cost is relatively high. At the same time, the size of the photovoltaic module is large. Therefore, it is often difficult to quickly evaluate the UV attenuation differences between different products using the current method.

[0004] Currently, some manufacturers evaluate the UV resistance of BC cell wafers themselves by directly irradiating the BC cell wafers with UV light. However, in the case of using BC cell wafers for evaluation experiments, since the BC cells are in an open-circuit state, which is different from the short-circuit state of the photovoltaic modules composed of BC cells mentioned above, the UV resistance obtained based on this scheme actually cannot directly reflect the UV resistance of the actual product, that is, it is impossible to directly evaluate the UV attenuation differences between different products. Summary of the Invention

[0005] An embodiment of the present invention provides a method and device for testing the performance of photovoltaic cells to solve the problems that the existing testing methods have high testing costs and it is difficult to accurately obtain the UV resistance of BC cells.

[0006] In a first aspect, to achieve the above object, the technical solution adopted by the present invention is: to provide a device for testing the performance of photovoltaic cells, including: A test chamber, inside which there is a substrate for supporting the cell wafer to be tested. Above the substrate, there is a packaging glass, and a packaging adhesive film is arranged on the lower surface of the packaging glass facing the cell wafer to be tested; a receiving cavity is formed between the packaging glass and the substrate; vacuum suction holes are arranged on the substrate; the vacuum suction holes are connected to a vacuum pump outside the test chamber through vacuum suction pipes so that the cell wafer to be tested is adsorbed on the substrate; the receiving cavity is connected to the vacuum pump through a vacuum extraction pipe for forming a vacuum above the cell wafer to be tested; The thimble test stand is located below the substrate; the thimble test stand includes a support plate, a positive thimble and a negative thimble arranged on the support plate, and a lifting bracket arranged on the lower surface of the support plate; the positive thimbles correspond one by one to the positive electrodes on the back of the battery cell to be tested, and the negative thimbles correspond one by one to the negative electrodes on the back of the battery cell to be tested, so as to short-circuit the positive electrode and the negative electrode of the battery cell to be tested; wherein, thimble through holes through which the negative thimbles and the positive thimbles slide are provided on the substrate; the lifting bracket jacks up the positive thimbles and the negative thimbles to abut against the positive electrode and the negative electrode of the battery cell to be tested; and An ultraviolet lamp is arranged above the encapsulation glass to irradiate the battery cell to be tested in the test chamber through the encapsulation glass and the encapsulation adhesive film.

[0007] Combined with the first aspect, in a feasible manner, a plurality of vacuum suction holes are evenly distributed on the substrate; a vacuum chamber is arranged below the thimble test stand, the vacuum suction pipe communicates downward with the vacuum chamber, and the vacuum pump communicates with the vacuum chamber through a vacuum main pipe; the lifting bracket is arranged on the vacuum chamber.

[0008] Combined with the first aspect, in a feasible manner, the lifting bracket includes four electric push rods, and the connection lines of the four electric push rods are distributed in a rectangular shape.

[0009] Combined with the first aspect, in a feasible manner, the positive thimbles and the negative thimbles are in sliding and sealing fit with the corresponding thimble through holes.

[0010] Combined with the first aspect, in a feasible manner, the device includes a support frame, the test chamber and the vacuum chamber are both arranged on the support frame; the ultraviolet lamp is installed on the support frame.

[0011] Combined with the first aspect, in a feasible manner, the vacuum chamber is a part of the test chamber, wherein a partition is arranged below the test chamber, and a space between the partition and the bottom plate of the test chamber forms the vacuum chamber; the vacuum suction pipe passes through the partition; the thimble test stand is arranged on the partition; a chamber door is arranged on the side of the test chamber.

[0012] Combined with the first aspect, in a feasible manner, a support step is arranged at the upper end of the test chamber, and the encapsulation glass is supported on the support step.

[0013] In the second aspect, an embodiment of the present invention further provides a method for testing the performance of a photovoltaic cell. Based on the photovoltaic cell performance testing device, the method includes: Step 1, cutting a whole battery cell into n pieces to form n battery cells to be tested, and exposing them in the air for 10 - 30 minutes; In Step 2, select one of the exposed solar cells as the solar cell to be tested, and conduct initial tests on power, EL, and PL, and record the initial data as P1, EL1, and PL1; In Step 3, place the solar cell to be tested with its back contacting the substrate, and make the positive and negative electrodes of the solar cell to be tested correspond to the thimble through holes on the substrate one by one; In Step 4, turn on the vacuum pump to evacuate the space above the solar cell to be tested to a vacuum state, and use a vacuum suction pipe to adsorb the solar cell to be tested on the substrate; In Step 5, raise the thimble test stand so that the positive thimble and the negative thimble simultaneously pass through the corresponding thimble through holes and make contact with the positive and negative electrodes on the solar cell to be tested one by one; In Step 6, evacuate the accommodation cavity above the solar cell to be tested. Here, the substrate and the upper encapsulation glass form the accommodation cavity for the solar cell to be tested; In Step 7, adjust the temperature of the substrate to 60 ± 5 °C through a temperature controller; In Step 8, turn on the ultraviolet light to irradiate the solar cell to be tested with ultraviolet light; In Step 9, conduct power, EL, and PL tests on the solar cell to be tested after ultraviolet light irradiation, and record the test results as P2, EL2, and PL2; In Step 10, the power attenuation P decay = (P1 - P2) / P1 < 3%, which means the power test is qualified; There is no obvious change in EL2 compared with EL1, which means the EL test is qualified; There is no obvious change in PL2 compared with PL1, and the leakage positions do not increase, which means the PL test is qualified; If the power, EL, and PL tests are all qualified, it is evaluated that the anti-UV performance of the whole solar cell itself is qualified.

[0014] In a second aspect, in a realizable manner, in Step 9, use a radiometer to measure that the irradiance with wavelengths ranging from 280 nm to 400 nm does not exceed 250 W / ㎡, and the irradiance uniformity on the entire measurement plane reaches ±15%; Make the ultraviolet light irradiate the solar cell to be tested vertically; The total ultraviolet irradiance, with wavelengths ranging from 280 nm to 400 nm, is at least 60 kWh / ㎡, and the irradiation amount with wavelengths ranging from 280 nm to 320 nm accounts for 5% - 7% of the total irradiation amount.

[0015] The photovoltaic cell performance testing method and device provided by the present invention, compared with the prior art, have the beneficial effects that: by cutting a whole cell into n pieces and using the cut single cell for testing, there is no need to make the cell into a photovoltaic module, reducing the testing cost; and by using a thimble test rack to short-circuit the cell to be tested, simulating the short-circuit state of the photovoltaic module, the anti-UV performance of the BC cell can be obtained more accurately; at the same time, this testing method can test different products and can quickly evaluate the UV attenuation differences between different products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the photovoltaic cell performance testing device provided by an embodiment of the present invention; Description of the reference numerals in the drawings: 1, testing chamber; 2, substrate; 3, cell to be tested; 4, encapsulation adhesive film; 5, encapsulation glass; 6, ultraviolet lamp; 7, temperature controller; 8, support plate; 9, positive thimble; 10, negative thimble; 11, lifting bracket; 12, vacuum suction pipe; 13, partition; 14, vacuum chamber; 15, vacuum main pipe; 16, vacuum pump; 17, vacuum extraction pipe; 18, accommodation cavity; 19, temperature sensor; 20, support step. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Please refer to Figure 1 , and now the photovoltaic cell performance testing method provided by the present invention will be described. The photovoltaic cell performance testing device includes a testing chamber 1, a thimble test rack and an ultraviolet lamp 6.

[0019] Inside the testing chamber 1, there is a substrate 2 for supporting the cell to be tested 3. Above the substrate 2, there is an encapsulation glass 5. An encapsulation adhesive film 4 is arranged on the lower surface of the encapsulation glass 5 facing the cell to be tested 3; a accommodation cavity 18 is formed between the encapsulation glass 5 and the substrate 2; vacuum suction holes are arranged on the substrate 2; the vacuum suction holes are communicated with a vacuum pump 16 outside the testing chamber 1 through a vacuum suction pipe 12, so that the cell to be tested 3 is adsorbed on the substrate 2; the accommodation cavity 18 is connected to the vacuum pump 16 through a vacuum extraction pipe 17 for forming a vacuum above the cell to be tested 3; among them, the encapsulation adhesive film 4 and the encapsulation glass 5 above the cell to be tested 3 simulate the photovoltaic module made of the cell to be tested 3, but there is no need to actually make it into a photovoltaic module. In this way, compared with performing the UV attenuation test after making it into a photovoltaic module, the testing cost is greatly reduced.

[0020] A temperature sensor 19 is provided inside the substrate 2, and a temperature controller 7 is connected to the substrate 2 to control the temperature of the substrate 2, thereby ensuring the accuracy of the test temperature of the battery cell 3 to be measured. The temperature controller 7 and the temperature sensor 19 are connected by a wire. The temperature sensor 19 is responsible for detecting the temperature of the substrate 2 in real time, converting the temperature signal into an electrical signal, and then transmitting the electrical signal to the temperature controller 7. The temperature controller 7 compares the received electrical signal with a preset temperature value (60 ± 5 °C). If the actual temperature is lower than the preset lower limit value, the temperature controller 7 will send an instruction to increase the heating power of the substrate 2; if the actual temperature is higher than the preset upper limit value, it will send an instruction to reduce the heating power, thereby ensuring that the temperature of the substrate 2 is maintained within the set range and guaranteeing the accuracy of the test temperature of the battery cell 3 to be measured.

[0021] In practical applications, the temperature controller 7 can be selected from the E5CC series of OMRON. This series of temperature controllers 7 has high-precision temperature control capabilities, good stability and reliability. The temperature sensor 19 can be selected as a PT100 type temperature sensor 19, which has advantages such as high measurement accuracy and good linearity, and can accurately measure the temperature of the substrate 2 and stably transmit the signal to the temperature controller 7.

[0022] The thimble test stand is located below the substrate 2; the thimble test stand includes a support plate 8, a positive thimble 9 and a negative thimble 10 provided on the support plate 8, and a lifting bracket 11 provided on the lower surface of the support plate 8; the positive thimble 9 corresponds one-to-one with the positive electrode on the back of the battery cell to be measured, and the negative thimble 10 corresponds one-to-one with the negative electrode on the back of the battery cell to be measured to short-circuit the positive and negative electrodes of the battery cell 3 to be measured; wherein, thimble through holes through which the negative thimble 10 and the positive thimble 9 slide are provided on the substrate 2; the lifting bracket 11 jacks up the positive thimble 9 and the negative thimble 10 to abut against the positive and negative electrodes of the battery cell 3 to be measured. During the test, the lifting bracket 11 rises, and the positive thimble 9 and the negative thimble 10 pass through the thimble through holes and abut against the positive and negative electrodes on the battery cell 3 to be measured, realizing the short-circuit of the positive and negative electrodes of the battery cell 3 to be measured. After the test is completed, the lifting bracket 11 drives the support plate 8 to descend.

[0023] The ultraviolet lamp 6 is provided above the encapsulation glass 5 to irradiate the battery cell 3 to be measured in the test chamber 1 through the encapsulation glass 5 and the encapsulation adhesive film 4.

[0024] The photovoltaic cell performance testing method and device provided by the present invention have the following beneficial effects compared with the prior art: by cutting a whole solar cell into n pieces and using the cut single solar cell for testing, it is not necessary to fabricate the solar cell into a photovoltaic module, reducing the testing cost; and by using the thimble test fixture to short-circuit the solar cell 3 to be tested, simulating the short-circuit state of the photovoltaic module, the anti-UV performance of the BC cell can be obtained more accurately; at the same time, this testing method can test different products and can quickly evaluate the UV attenuation differences between different products.

[0025] In some embodiments, referring to Figure 1 , a plurality of vacuum suction holes are uniformly arranged on the substrate 2; a vacuum box 14 is arranged below the thimble test fixture, a vacuum suction pipe 12 communicates downward with the vacuum box 14, and a vacuum pump 16 communicates with the vacuum box 14 through a vacuum main pipe 15; a lifting bracket 11 is arranged on the vacuum box 14. Since the photovoltaic module has a relatively large length and width size, in order to improve the firmness of the adsorption of the solar cell 3 to be tested, a plurality of vacuum suction holes are arranged on the substrate 2, and by increasing the adsorption area, the uniformity of the adsorption force at each position of the solar cell 3 to be tested is improved.

[0026] In some embodiments, referring to Figure 1 , the lifting bracket 11 includes four electric push rods, and the connection lines of the four electric push rods are distributed in a rectangular shape. When the four electric push rods are raised synchronously, the thimble test fixture is raised. Since their connection lines are distributed in a rectangular shape, this layout can ensure the stability of the lifting process, so that the positive thimble 9 and the negative thimble 10 move upward smoothly and accurately pass through the corresponding thimble through holes to achieve one-to-one contact with the positive and negative electrodes on the solar cell 3 to be tested.

[0027] The testing effect of this thimble test fixture is remarkable. By making the positive thimble 9 and the negative thimble 10 correspond to and contact the electrodes on the back of the solar cell one by one, the short-circuit state of the photovoltaic module is successfully simulated. This simulated state is crucial for accurately evaluating the anti-UV performance of the BC cell because it is closer to the electrical connection situation of the actual photovoltaic module in use. In the traditional testing method, since this short-circuit state cannot be accurately simulated, the test results often cannot truly reflect the anti-UV performance of the solar cell. The thimble test fixture in the present invention solves this problem and greatly improves the accuracy of the test results.

[0028] In some embodiments, referring to Figure 1, the positive electrode thimble 9 and the negative electrode thimble 10 are in sliding seal fit with the corresponding thimble through holes. The sliding seal fit between the thimble and the thimble through hole ensures the tightness of the test environment. During the test, when the vacuum pump 16 extracts the air in the accommodation cavity 18 to form a vacuum, this seal fit can effectively prevent air leakage, ensure the stability of the vacuum environment, and thus provide reliable environmental conditions for the test. This helps to more accurately measure the performance changes of the solar cell under different conditions. For example, in power, EL, and PL tests, a stable test environment can reduce the interference of external factors and make the test results more reliable.

[0029] The structural design of the thimble test stand below the substrate 2 is reasonable, which is convenient for mating with the thimble through holes on the substrate 2 and does not affect the construction of the vacuum environment above and operations such as ultraviolet light irradiation. It works in coordination with other components of the entire test device. For example, together with the test chamber 1, the vacuum pump 16, the ultraviolet lamp 6, etc., it constitutes a complete test system, enabling the performance test of the photovoltaic cell to be carried out efficiently and accurately.

[0030] In some embodiments, the device includes a support frame (not shown in the figure), and both the test chamber 1 and the vacuum chamber 14 are provided on the support frame; the ultraviolet lamp 6 is installed on the support frame.

[0031] In some embodiments, referring to Figure 1 , the vacuum chamber 14 is a part of the test chamber 1. Among them, a partition 13 is provided below the test chamber 1, and a vacuum chamber 14 is formed between the partition 13 and the bottom plate of the test chamber 1; the vacuum suction pipe 12 passes through the partition 13; the thimble test stand is provided on the partition 13; a chamber door is provided on the side of the test chamber 1.

[0032] Optionally, a box body can be provided outside the test chamber 1 and the vacuum chamber 14, and the ultraviolet lamp 6 is installed at the top inside the box body. The test chamber 1, the thimble test stand, and the vacuum chamber 14 are all inside the box body.

[0033] In some embodiments, referring to Figure 1 , a support step 20 is provided at the upper end of the test chamber 1, and the encapsulation glass 5 is supported on the support step 20. Such a setting can ensure the stable placement of the encapsulation glass 5 on the test chamber 1 and avoid affecting the test results due to position deviation during the test. The height and width of the support step 20 are precisely designed. The height can not only provide a suitable support height for the encapsulation glass 5 to ensure the accurate relative position between the glass and the relevant test components inside the test chamber 1 but also prevent the glass from being easily toppled due to being too high; the width is sufficient to stably support the bottom edge of the encapsulation glass 5, making the bottom of the encapsulation glass 5 evenly stressed.

[0034] Meanwhile, the surface of the support step 20 is smooth and flat, which helps to reduce the friction between the encapsulation glass 5 and the support step 20, preventing scratches on the glass surface when placing or removing the encapsulation glass 5, thereby ensuring the integrity of the encapsulation glass 5 and the accuracy of the test.

[0035] Based on the same inventive concept, an embodiment of the present application further provides a method for testing the performance of a photovoltaic cell. Based on the photovoltaic cell performance testing device described above, the method includes: Step 1: Cut a whole piece of cell into n pieces to form n pieces of test cells 3, and expose them in the air for 10 - 30 minutes; n is a positive integer. For example, cut the whole piece of cell into 4 pieces, 6 pieces or 8 pieces, etc. Step 2: Select one of the exposed test cells 3 as the test cell for the initial tests of power, EL, and PL, and record the initial data as P1, EL1, and PL1. Step 3: Place the back of the test cell 3 after the initial test in contact with the substrate 2, and make the positive and negative electrodes of the test cell 3 correspond one by one with the thimble through holes on the substrate 2 to ensure that the positive and negative electrodes of the test cell 3 are in a short - circuit state. Step 4: Turn on the vacuum pump 16, and through the vacuum suction pipe 12, adsorb the test cell 3 on the substrate 2; the vacuum adsorption pressure is 0.1 - 0.2 Kpa. Step 5: Raise the thimble test frame so that the positive thimble 9 and the negative thimble 10 simultaneously pass through the corresponding thimble through - holes and make contact with the positive and negative electrodes on the test cell 3 one by one; during this process, apply a force of 0.5 - 0.8 N to the test cell 3 to ensure that the positive thimble 9 and the negative thimble 10 are in full contact with the positive and negative electrodes of the test cell 3. Step 6: Evacuate the accommodation cavity 18 above the test cell 3, and set the vacuum degree to 1.0 - 1.2 MPa. Among them, the substrate 2 and the encapsulation glass 5 above form the accommodation cavity 18 for the test cell 3. Step 7: Adjust the temperature of the substrate 2 to 60 ± 5 °C through the temperature controller 7. Step 8: Turn on the ultraviolet light and irradiate the test cell 3 with ultraviolet light. Step 9: Conduct power, EL, and PL tests on the test cell 3 after ultraviolet light irradiation, and record the test results as P2, EL2, and PL2. Use a radiometer to measure that the irradiance with wavelengths ranging from 280 nm to 400 nm does not exceed 250 W / ㎡, and the irradiance uniformity on the entire measurement plane reaches ± 15%. Make the ultraviolet light irradiate perpendicularly on the test cell 3. The total ultraviolet irradiance is at least 60 kWh / ㎡ with a wavelength range of 280 nm to 400 nm, and the irradiance in the wavelength range of 280 nm to 320 nm accounts for 5% - 7% of the total irradiance; Step ten, the power attenuation P_loss = (P1 - P2) / P1 is less than 3%, indicating that the power test is qualified; There is no obvious change in EL2 compared with EL1, indicating that the EL test is qualified; There is no obvious change in PL2 compared with PL1, and the leakage positions do not increase, indicating that the PL test is qualified; If the power, EL, and PL tests are all qualified, it is evaluated that the anti-UV performance of the whole cell itself is qualified.

[0036] Explanation: The power of a cell refers to the energy output by the cell per unit time under certain discharge conditions, usually measured in watts (W) or kilowatts (kW). Specifically, the power of a cell can be measured by its output power, that is, the output power under standard lighting conditions (such as a light intensity of 1000 W per square meter).

[0037] PL detection (photoluminescence detection): Photoluminescence (PL for short), PL detection is a photovoltaic module detection technology using the principle of photoluminescence. It can be used to determine whether there are defects, impurities and other factors that ultimately affect the battery efficiency in the sample through photoluminescence.

[0038] EL detection (electroluminescence detection): EL is the abbreviation of electroluminescence of the cell. It is a method for detecting internal defects of crystalline silicon solar cells, and EL detection is a photovoltaic module detection technology using the principle of electroluminescence.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic cell performance testing device, characterized in that: include: A test box (1) is provided with a substrate (2) supporting a battery cell (3) to be tested, a sealing glass (5) is provided above the substrate (2), and a sealing adhesive film (4) is provided on the lower surface of the sealing glass (5) facing the battery cell (3) to be tested; a receiving cavity (18) is formed between the sealing glass (5) and the substrate (2); a vacuum suction hole is provided on the substrate (2); the vacuum suction hole is connected to a vacuum pump (16) outside the test box (1) through a vacuum suction pipe (12), so that the battery cell (3) to be tested is adsorbed on the substrate (2); the receiving cavity (18) is connected to the vacuum pump (16) through a vacuum suction pipe (17), so as to form a vacuum above the battery cell (3) to be tested; A pin test frame is located below the substrate (2); the pin test frame comprises a support plate (8), a positive pin (9) and a negative pin (10) arranged on the support plate (8), and a lifting bracket (11) arranged on the lower surface of the support plate (8); the positive pin (9) corresponds one-to-one with the positive electrode on the back side of the battery cell to be tested, and the negative pin (10) corresponds one-to-one with the negative electrode on the back side of the battery cell to be tested, so as to short-circuit the positive electrode and the negative electrode of the battery cell to be tested (3); wherein the substrate (2) is provided with a pin through hole through which the negative pin (10) and the positive pin (9) slide; the lifting bracket (11) lifts the positive pin (9) and the negative pin (10) upward to abut against the positive electrode and the negative electrode of the battery cell to be tested (3); and An ultraviolet lamp (6) is arranged above the packaging glass (5) to irradiate the battery cell (3) to be tested in the test box (1) through the packaging glass (5) and the packaging adhesive film (4).

2. The photovoltaic cell performance testing device according to claim 1, characterized in that: The substrate (2) is provided with a plurality of vacuum suction holes evenly distributed thereon; a vacuum box (14) is provided below the ejector pin test frame, the vacuum suction pipe (12) is connected downwardly to the vacuum box (14), and the vacuum pump (16) is connected to the vacuum box (14) via a vacuum main pipe (15); and the lifting bracket (11) is provided on the vacuum box (14).

3. The photovoltaic cell performance testing device according to claim 1, characterized in that: The lifting bracket (11) comprises four electric push rods, and the connecting line of the four electric push rods is distributed in a rectangular shape.

4. The photovoltaic cell performance testing device according to claim 1, characterized in that: The positive electrode ejector pin (9) and the negative electrode ejector pin (10) are both slidably and sealingly matched with the corresponding ejector pin through-holes.

5. The photovoltaic cell performance testing device according to claim 2, characterized in that: The device comprises a supporting frame, the test box (1) and the vacuum box (14) are both arranged on the supporting frame; and the ultraviolet lamp (6) is installed on the supporting frame.

6. The photovoltaic cell performance testing device according to claim 5, characterized in that: The vacuum box (14) is a part of the test box (1), wherein a partition (13) is arranged at the bottom of the test box (1), and the vacuum box (14) is formed between the partition (13) and the box bottom plate of the test box (1); the vacuum suction pipe (12) passes through the partition (13); the ejector pin test frame is arranged on the partition (13); and a box door is arranged on the side of the test box (1).

7. The photovoltaic cell performance testing device according to claim 1, characterized in that: A supporting step (20) is provided at the upper end of the test box (1), and the packaging glass (5) is supported on the supporting step (20).

8. A photovoltaic cell performance testing method, based on the photovoltaic cell performance testing device according to any one of claims 1 to 7, characterized in that: The method comprises: Step 1: Cut the whole battery cell into n pieces to form n battery cells to be tested (3), and expose them to air for 10-30 minutes; Step 2, selecting a cell after exposure as the cell to be tested (3) to perform initial tests on power, EL, and PL, and recording the initial data as P1, EL1, and PL1; Step 3, placing the back side of the battery cell (3) to be tested that has undergone the initial test in contact with the substrate (2), and making the positive and negative electrodes of the battery cell (3) to be tested correspond one by one to the ejector pin through holes on the substrate (2); Step 4, turning on the vacuum pump (16), drawing a vacuum state above the battery cell (3) to be tested, and adsorbing the battery cell (3) to be tested onto the substrate (2) through the vacuum suction pipe (12); Step 5, raising the ejector pin test frame, so that the positive electrode ejector pin (9) and the negative electrode ejector pin (10) simultaneously pass through the corresponding ejector pin via holes, and contact the positive electrode and the negative electrode on the battery cell (3) to be tested one by one, so as to achieve a short circuit between the positive and negative electrodes of the battery cell (3) to be tested; Step six, evacuating the accommodating cavity (18) above the battery cell (3) to be tested, wherein the substrate (2) and the packaging glass (5) above constitute the accommodating cavity (18) for the battery cell (3) to be tested; Step 7, adjusting the temperature of the substrate (2) to 60±5° C. by means of a temperature controller (7); Step 8, turning on the ultraviolet light to irradiate the battery cell (3) to be tested; Step nine, performing power, EL and PL tests on the battery cell (3) to be tested after being irradiated with ultraviolet light, and recording the test results as P2, EL2 and PL2; Step 10: Power attenuation Pdecay = (P1-P2) / P1 is less than 3%, which means the power test is qualified; EL2 has no obvious change compared with EL1, and it is qualified in EL test; There is no significant change between PL2 and PL1, and the leakage position does not increase, so the PL test is qualified; If the power, EL, and PL tests are all qualified, the UV resistance of the entire cell itself is considered qualified.

9. The photovoltaic cell performance testing method according to claim 8, characterized in that: In step nine, the irradiance at a wavelength of 280nm to 400nm measured by a radiometer does not exceed 250W / ㎡, and the irradiance uniformity on the entire measurement plane reaches ±15%; Make the ultraviolet light shine vertically on the battery cell to be tested; The total UV irradiance with a wavelength of 280nm to 400nm is at least 60kWh / ㎡, and the irradiance with a wavelength range of 280nm to 320nm accounts for 5%-7% of the total irradiance.

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