Testing Method for Back-Contact Battery

Abstract

The present application provides a method for testing a back-contact battery. First, the light emitted by a test light source is made to pass through a light-transmitting component, and the light-transmitting component has the same light transmittance as the light-transmitting pressing component on the back-contact battery. Then, the output light intensity of the test light source is adjusted so that the light intensity of the light emitted by the test light source after passing through the light-transmitting component is equal to the standard light intensity. Subsequently, the adjusted test light source is used to irradiate the back-contact battery through the light-transmitting pressing component to test the performance parameters of the back-contact battery under the standard light intensity. Since the adjustment of the output light intensity of the test light source is to adjust the light intensity of the light passing through the light-transmitting component to make it equal to the standard light intensity. Moreover, the light-transmitting component has the same light transmittance as the light-transmitting pressing component on the back-contact battery. Therefore, when the light emitted by the adjusted test light source passes through the light-transmitting pressing component and reaches the back-contact battery, the light intensity is equal to the standard light intensity, ensuring that the test environment of the back-contact battery is more accurate, thereby improving the accuracy of the test.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cells, and specifically, to a method for testing back-contact cells. Background Art

[0002] In solar photovoltaic technology, the most significant feature of an IBC (Interdigitated back contact) solar cell is that both the PN junction and the contact metal are located on the back of the IBC cell. The front side of the IBC cell completely avoids the occlusion of the metal grid electrode, can maximize the utilization of incident light, reduce optical losses, and has a higher short-circuit current.

[0003] Photovoltaic cells need to be subjected to performance tests before leaving the factory. However, both the positive and negative electrodes of the IBC cell are arranged on the back, and due to the unbalanced double-sided stress, the cell is prone to warping. When performing a performance test on the IBC cell, the probe of the test equipment needs to be electrically connected to the contact metal on the back of the IBC cell. However, due to the warping of the IBC cell, the probe cannot fully contact the probe, thus affecting the accuracy of the test.

[0004] During the test process, methods such as negative pressure adsorption or pressing are usually used to make the IBC cell contact the probe, ensuring that the performance test of the IBC cell can be successfully completed. However, the method of negative pressure adsorption cannot ensure sufficient contact between the IBC cell and the probe. The pressing method will affect the accuracy of the test results.

[0005] Therefore, how to accurately test the performance parameters of IBC cells is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0006] This application aims to at least solve one of the technical problems existing in the prior art, and proposes a method for testing back-contact cells.

[0007] To achieve the purpose of this application, there is provided a method for testing a back-contact cell, where the positive and negative electrodes of the back-contact cell are both arranged on a first surface, including:

[0008] Making the light emitted by a test light source pass through a light-transmitting component, where the light-transmitting rate of the light-transmitting component is the same as that of the light-transmitting pressing member on the back-contact cell;

[0009] Adjusting the output light intensity of the test light source so that the light intensity of the light emitted by the test light source after passing through the light-transmitting component is equal to the standard light intensity;

[0010] Using the adjusted test light source to irradiate the back-contact cell through the light-transmitting pressing member to test the performance parameters of the back-contact cell under the standard light intensity.

[0011] In some embodiments, obtaining the standard light intensity includes:

[0012] Using the test light source to irradiate the back-contact battery through the light-transmitting pressing member;

[0013] Detecting the test light intensity response parameters of the back-contact battery under the irradiation of the test light source;

[0014] According to the test light intensity response parameters and the corresponding relationship between the light intensity response parameters of the back-contact battery and the output light intensity of the test light source obtained in advance, adjusting the output light intensity of the test light source so that the test light intensity response parameters are equal to the standard light intensity response parameters corresponding to the standard light intensity.

[0015] In some embodiments, obtaining the corresponding relationship includes:

[0016] Using the instrument light source of the quantum efficiency tester to emit light of various wavelengths to the back-contact battery through the light-transmitting pressing member;

[0017] Detecting the test response parameters of the back-contact battery corresponding to the light of various wavelengths through the quantum efficiency tester;

[0018] Determining the corresponding relationship according to the test response parameters corresponding to the light of various wavelengths.

[0019] In some embodiments, before using the instrument light source of the quantum efficiency tester to emit light of various wavelengths to the back-contact battery through the light-transmitting pressing member, it further includes:

[0020] Making the light of different wavelengths emitted by the instrument light source of the quantum efficiency tester pass through the light-transmitting member covering the light-receiving surface of the calibrator of the quantum efficiency tester;

[0021] Detecting the actual light intensity of the light of various wavelengths through the calibrator;

[0022] Calibrating the instrument light source according to the actual light intensity so that the light of various wavelengths emitted by the instrument light source corresponds to the actual light intensity.

[0023] In some embodiments, obtaining the standard light intensity includes:

[0024] Using the test light source to irradiate the reference solar cell through the light-transmitting member covering the light-receiving surface of the reference solar cell;

[0025] Detecting the test light intensity response parameters of the reference solar cell under the irradiation of the test light source;

[0026] Adjust the output light intensity of the test light source according to the test light intensity response parameter and the corresponding relationship between the light intensity response parameter of the reference solar cell obtained in advance and the output light intensity of the test light source, so that the test light intensity response parameter is equal to the standard light intensity response parameter corresponding to the standard light intensity.

[0027] In some embodiments, after using the adjusted test light source to irradiate the back-contact battery through the light-transmitting pressing member to test the performance parameters of the back-contact battery under the standard light intensity, it further includes:

[0028] Test the absorption characteristics of the back-contact battery to be tested for light of different wavelengths;

[0029] Correct the performance parameters according to the absorption characteristics.

[0030] In some embodiments, testing the absorption characteristics of the back-contact battery to be tested for light of different wavelengths includes:

[0031] Use the instrument light source of the quantum efficiency tester to emit light of different wavelengths to the back-contact battery to be tested;

[0032] Detect the absorption characteristics of the back-contact battery to be tested for light of different wavelengths.

[0033] In some embodiments, before using the quantum efficiency tester to test the absorption characteristics of the back-contact battery to be tested for light of different wavelengths, it further includes:

[0034] Use the light of different wavelengths emitted by the instrument light source of the quantum efficiency tester to pass through the light-transmitting member covering the light-receiving surface of the calibrator of the quantum efficiency tester;

[0035] Detect the actual light intensity of the light of each wavelength through the calibrator;

[0036] Calibrate the instrument light source according to the actual light intensity so that the light of each wavelength emitted by the instrument light source corresponds to the actual light intensity.

[0037] In some embodiments, when flattening the back-contact battery to be tested through a light-transmitting pressing member, it further includes:

[0038] Install the back-contact battery to be tested through a packaging component, the packaging component includes the light-transmitting pressing member and a packaging frame arranged around the light-transmitting pressing member, the packaging frame is used to fix the edge of the back-contact battery to be tested, and the light-transmitting pressing member is used to fit the second surface of the back-contact battery to be tested to flatten the back-contact battery to be tested; the second surface faces away from the first surface.

[0039] In some embodiments, both the light-transmitting component and the light-transmitting pressing component are glass pressing components, and the light transmittance of the glass pressing component for light with a wavelength greater than or equal to 300 nanometers and less than or equal to 1200 nanometers is greater than or equal to 90%.

[0040] The present application has the following beneficial effects:

[0041] The test method for the back-contact battery provided by the present application is as follows: First, make the light emitted by the test light source pass through a light-transmitting component, and the light transmittance of the light-transmitting component is the same as that of the light-transmitting pressing component on the back-contact battery; then adjust the output light intensity of the test light source so that the light intensity of the light emitted by the test light source after passing through the light-transmitting component is equal to the standard light intensity; subsequently, use the adjusted test light source to irradiate the back-contact battery through the light-transmitting pressing component to test the performance parameters of the back-contact battery under the standard light intensity.

[0042] Since adjusting the output light intensity of the test light source is to adjust the light intensity of the light passing through the light-transmitting component to make it equal to the standard light intensity. And the light transmittance of the light-transmitting component is the same as that of the light-transmitting pressing component on the back-contact battery. Therefore, when the light emitted by the adjusted test light source passes through the light-transmitting pressing component and reaches the back-contact battery, the light intensity is equal to the standard light intensity, ensuring that the test environment of the back-contact battery is more accurate, and thus improving the accuracy of the test. Description of the Drawings

[0043] Figure 1 It is a flowchart of a specific implementation manner of the test method provided by the present application. Specific Embodiments

[0044] To enable those skilled in the art to better understand the technical solution of the present application, the test method for the back-contact battery provided by the present application will be described in detail below with reference to the drawings.

[0045] The test method for the back-contact battery provided by the present application is used to test the performance parameters of the back-contact battery. The positive electrode and the negative electrode of the back-contact battery are both arranged on the first surface of the battery cell, and the back-contact battery will bend due to unbalanced double-sided stress. Therefore, during the test, it is necessary to press the back-contact battery to be tested against the test equipment to ensure full contact between the two, thereby achieving electrical connection. To reduce the influence on the light irradiating the back-contact battery, a light-transmitting pressing component is usually used to press the back-contact battery during the test. However, the light-transmitting pressing component still blocks the test light, resulting in the actual light intensity reaching the back-contact battery to be tested being less than the light intensity required for the test, and thus leading to inaccurate test results.

[0046] The test method provided by the present application can be used in the test of various performance parameters. In the specification, the test of the current-voltage characteristics of the back-contact battery is taken as an example for illustration. Specifically, the test method for the back-contact battery includes:

[0047] S1. Make the light emitted by the test light source pass through a light-transmitting component, where the light transmittance of the light-transmitting component is the same as that of the light-transmitting pressing component on the back-contact battery;

[0048] The light emitted by the test light source passes through a light-transmitting component and then irradiates a detection component for detecting light intensity. Since the light transmittance of the light-transmitting component is the same as that of the light-transmitting pressing component, when the light emitted by the test light source reaches the detection component after passing through the light-transmitting component, the light intensity is equal to the light intensity when the same light passes through the light-transmitting pressing component and reaches the back-contact battery to be tested. The light-transmitting component is located between the detection component and the test light source. Users can select the light-transmitting component according to the properties such as the light transmittance of the light-transmitting pressing component, so that the optical performance of the light-transmitting component is as close as possible to that of the light-transmitting pressing component, thereby improving the accuracy of the test.

[0049] S2. Adjust the output light intensity of the test light source so that the light intensity of the light emitted by the test light source after passing through the light-transmitting component is equal to the standard light intensity;

[0050] The test of the back-contact battery needs to be carried out under the standard light intensity, so the light intensity of the test light source needs to be adjusted. During the adjustment process, the light intensity of the test light source is detected in real time. When the light intensity of the light emitted by the test light source after passing through the light-transmitting component is equal to the standard light intensity, the adjustment is stopped. At this time, the light intensity of the test light source meets the test requirements. The value of the standard light intensity can be determined according to the test needs. For example, when performing the current-voltage characteristic test, the required standard light intensity is 1000 W / m 2 .

[0051] S3. Use the adjusted test light source to irradiate the back-contact battery through the light-transmitting pressing component to test the performance parameters of the back-contact battery under the standard light intensity.

[0052] During the test process, place the back-contact battery under the adjusted test light source, and the light-transmitting pressing component is attached to the second surface of the back-contact battery, thereby flattening the back-contact battery so that its positive and negative electrodes can contact the test equipment to achieve electrical connection. The second surface of the back-contact battery faces away from the first surface. The structure of the test equipment can refer to the prior art and will not be elaborated here. After the light emitted by the adjusted test light source passes through the light-transmitting pressing component, the light intensity is equal to the standard light intensity. At this time, the light irradiates the back-contact battery to be tested, and accurate performance parameters can be obtained.

[0053] In this embodiment, the light emitted by the test light source irradiates the detection component after passing through a light-transmitting component, so the light intensity reaching the detection component can be equal to the light intensity reaching the back-contact battery during the test process. After this method is adjusted, it can ensure that the light intensity reaching the back-contact battery during the test is equal to the standard light intensity, thereby ensuring the accuracy of the test results.

[0054] The main purposes of steps S1 and S2 are to obtain a light source with a light intensity equal to the standard light intensity after passing through the light-transmitting pressing component. This application can use various methods to obtain the standard light intensity.

[0055] Example 1

[0056] In this embodiment, the corresponding relationship between the light intensity response parameter of the back-contact battery and the light intensity is obtained in advance, and then the light intensity of the test light source is detected by using the back-contact battery to obtain the standard light intensity, including:

[0057] Use the test light source to irradiate the back-contact battery through the light-transmitting pressing member;

[0058] In this embodiment, the light-transmitting pressing member that flattens the back-contact battery is used as the light-transmitting component, and the test light source irradiates the back-contact battery through the light-transmitting pressing member.

[0059] Detect the test light intensity response parameter of the back-contact battery under the irradiation of the test light source;

[0060] The light intensity response parameter can specifically be the short-circuit current of the back-contact battery. Before obtaining the standard light intensity, the corresponding relationship between the light intensity response parameter of the back-contact battery and the light intensity is obtained in advance. The test light intensity response parameter can specifically be the short-circuit current detected from the back-contact battery during the process of adjusting the test light source. In this embodiment, a test device can be used to detect the short-circuit current of the back-contact battery. Specifically, the test light source irradiates the back-contact battery through the light-transmitting pressing member, and a short-circuit current is generated in the back-contact battery after irradiation. The magnitude of the short-circuit current is related to the light intensity of the light. When the light intensity increases, the short-circuit current also increases; conversely, the short-circuit current decreases. Of course, the user can also use other parameters as the light intensity response parameter, or use other devices to detect the light intensity response parameter of the back-contact battery.

[0061] According to the test light intensity response parameter and the corresponding relationship between the light intensity response parameter of the back-contact battery and the output light intensity of the test light source obtained in advance, adjust the output light intensity of the test light source so that the test light intensity response parameter is equal to the standard light intensity response parameter corresponding to the standard light intensity.

[0062] When the test light source irradiates the back-contact battery, the test device is electrically connected to the back-contact battery and obtains the short-circuit current of the back-contact battery. Adjust the output light intensity of the test light source. Correspondingly, the short-circuit current of the back-contact battery also changes, and the test device detects the short-circuit current of the back-contact battery in real time. When the short-circuit current of the back-contact battery is equal to the standard short-circuit current corresponding to the marked light intensity, the adjustment of the test light source is completed. During the test process, the test light source irradiates the back-contact battery to be tested with the same output light intensity, and the light intensity is just equal to the standard light intensity after passing through the transparent pressing member.

[0063] Optionally, the obtaining of the corresponding relationship between the light intensity response parameter of the back-contact battery and the light intensity includes:

[0064] Use the instrument light source of the quantum efficiency tester to emit light of various wavelengths to the back-contact battery through the light-transmitting pressing member;

[0065] The test response parameters corresponding to the back-contact battery and light of each wavelength are detected by a quantum efficiency tester.

[0066] In this embodiment, the corresponding relationship between the short-circuit current and the light intensity of the back-contact battery is detected by a quantum efficiency tester. Of course, the user can also use other devices to detect the corresponding relationship between the short-circuit current and the light intensity of the back-contact battery, which is not limited here. Before detection, a light-transmitting pressing member is needed to flatten the back-contact battery so that it can be electrically connected to the quantum efficiency tester.

[0067] The corresponding relationship is determined according to the test response parameters corresponding to the light of each wavelength.

[0068] During the detection process, the instrument light source emits light quanta of different wavelengths to the back-contact battery, and the test response parameters of the back-contact battery to the light of each wavelength are determined according to the number of light quanta absorbed by the back-contact battery and the number of remaining light quanta. Then, the quantum efficiency tester determines the corresponding relationship between the short-circuit current and the light intensity of the back-contact battery according to the test response parameters of the back-contact battery. The specific calculation method can refer to the existing technology and will not be elaborated here.

[0069] Optionally, to ensure that the quantum efficiency tester can accurately detect the corresponding relationship between the short-circuit current and the light intensity of the back-contact battery, the instrument light source of the quantum efficiency tester needs to be calibrated before detection. Specifically, before the instrument light source of the quantum efficiency tester emits light of each wavelength through the light-transmitting pressing member to the back-contact battery, it further includes:

[0070] Making the light of different wavelengths emitted by the instrument light source of the quantum efficiency tester pass through the light-transmitting component covering the light-receiving surface of the calibrator covering the quantum efficiency tester;

[0071] There is a calibrator in the quantum efficiency tester. During the calibration process, the instrument light source emits light to the calibrator. Considering that when detecting the corresponding relationship between the short-circuit current and the light intensity of the back-contact battery, the second surface of the back-contact battery is covered with a light-transmitting pressing member, and a light-transmitting component is also covered on the light-receiving surface of the calibrator during calibration, so as to ensure that the calibration result of the calibrator is the same as the actual light received by the back-contact battery. It should be noted that the calibrator is usually a packaged battery cell, and the light-transmitting component covers the light-receiving surface of the calibrator during the calibration process, so as to ensure the accuracy of the calibration result.

[0072] The actual light intensity of the light of each wavelength is detected by the calibrator of the quantum efficiency tester.

[0073] The light emitted by the instrument light source passes through the light-transmitting component and irradiates the calibrator, and the calibrator measures the actual light intensity of the light passing through the light-transmitting component. The actual light intensity is also the light intensity of the light irradiating the back-contact battery when detecting the corresponding relationship between the short-circuit current and the light intensity of the back-contact battery. The light intensity of the light is related to the number of light quanta. Therefore, by calibrating the actual light intensity of the light of each wavelength, the number of light quanta emitted by the instrument light source can be determined.

[0074] Calibrate the instrument light source according to the actual light intensity so that the light of each wavelength emitted by the instrument light source corresponds to the actual light intensity.

[0075] Calibrate the instrument light source according to the actual light intensity measured by the calibrator, that is, assign the actual light intensity to the light of the corresponding wavelength, and then use the calibrated instrument light source to irradiate the back-contact battery.

[0076] In this embodiment, the testing method first calibrates the quantum efficiency tester, and then uses the calibrated quantum efficiency tester to detect the corresponding parameters between the light intensity response parameters and the light intensity of the back-contact battery. During the calibration process, a light-transmitting component is used to cover the calibrator so that the light intensity of the calibrated instrument light source is equal to the light intensity actually received by the back-contact battery when irradiating the back-contact battery, and thus the corresponding relationship between the light intensity response parameters and the light intensity of the accurate back-contact battery can be obtained. Then use the back-contact battery to detect the output light intensity of the test light source, adjust the test light source so that the light intensity of the light emitted by the test light source after passing through the light-transmitting component is equal to the standard light intensity. Subsequently, use the adjusted test light source to irradiate the back-contact battery, and use the test equipment to detect performance parameters such as the short-circuit voltage of the back-contact battery.

[0077] Embodiment 2

[0078] This embodiment uses a reference solar cell to detect the light intensity of the test light source and obtain the standard light intensity, including:

[0079] Use the test light source to irradiate the reference solar cell through the light-transmitting component covering the light-receiving surface of the reference solar cell;

[0080] The reference solar cell is a standard device for detecting light intensity, and its structure can refer to the prior art. Before the test, the light-receiving surface of the reference solar cell is covered with a light-transmitting component, and the test light source irradiates the reference solar cell through the light-transmitting component. The illumination conditions where the reference solar cell is located are the same as those of the back-contact battery to be tested.

[0081] Detect the test light intensity response parameters of the reference solar cell under the irradiation of the test light source;

[0082] The reference solar cell is electrically connected to the test equipment, and the test equipment is used to detect the test light intensity corresponding parameters of the reference solar cell under the irradiation of the test light source. The test light intensity response parameters can specifically be the short-circuit current of the reference solar cell.

[0083] According to the measured light intensity response parameters and the correspondence between the light intensity response parameters of a pre-acquired reference solar cell and the output light intensity of the test light source, adjust the output light intensity of the test light source so that the measured light intensity response parameters are equal to the standard light intensity response parameters corresponding to the standard light intensity.

[0084] Before the test, the correspondence between the short-circuit current of the reference solar cell and the light intensity is known. According to the standard light intensity, the standard short-circuit current of the reference solar cell corresponding to the standard light intensity can be determined. Adjust the output light intensity of the test light source. The test equipment can detect the short-circuit current of the reference solar cell. When the short-circuit current is equal to the standard short-circuit current, the light intensity of the light passing through the light-transmitting component is equal to the standard light intensity, and the adjustment of the test light source is completed. Subsequently, use the adjusted test light source to irradiate the back-contact cell to be tested, and the light intensity reaching the back-contact cell to be tested is equal to the standard light intensity. At this time, the back-contact cell is connected to the test equipment, and the test equipment detects performance parameters such as the short-circuit current and short-circuit voltage of the back-contact cell.

[0085] Optionally, when adjusting the standard light intensity, the short-circuit current is used as the standard. Since the reference solar cell and the back-contact cell to be tested have different absorption characteristics for light of different wavelengths, there will be a certain difference between the light intensity detected by the reference solar cell and the light intensity detected by the back-contact cell to be tested. Therefore, after the test, the performance parameters of the back-contact cell need to be corrected. After using the adjusted test light source to irradiate the back-contact cell through the light-transmitting pressing member to test the performance parameters of the back-contact cell under the standard light intensity, it further includes:

[0086] Test the absorption characteristics of the back-contact cell to be tested for light of different wavelengths;

[0087] Correct the performance parameters according to the absorption characteristics.

[0088] The absorption characteristics of the reference solar cell for light of different wavelengths are known conditions. Before correcting the performance parameters, it is necessary to detect the absorption characteristics of the back-contact cell for light of different wavelengths. Then correct the performance parameters according to the absorption characteristics. The correction method can refer to the existing technology, such as IEC60904-7:2019 "Photovoltaic Devices - Spectral Mismatch Correction Calculation".

[0089] Optionally, in this embodiment, a quantum efficiency tester can be used to test the absorption characteristics of the back-contact cell to be tested for light of different wavelengths, including:

[0090] Use the instrument light source of the quantum efficiency tester to emit light of different wavelengths to the back-contact cell to be tested;

[0091] The back-contact cell to be tested is electrically connected to the quantum efficiency tester, and the instrument light source irradiates the back-contact cell with light of different wavelengths respectively.

[0092] Detect the absorption characteristics of the back-contact battery to be measured for light of different wavelengths.

[0093] The quantum efficiency tester determines the number of absorbed light quanta, and based on the light intensity, determines the total number of light quanta of light of each wavelength, and then calculates the absorption characteristics of the back-contact battery for light of different wavelengths. The calculation method can refer to the prior art and will not be elaborated here. After obtaining the absorption characteristics of the back-contact battery, the performance parameters of the back-contact battery can be corrected.

[0094] Optionally, before testing the absorption characteristics of the back-contact battery, it is necessary to calibrate the instrument light source of the quantum efficiency tester. Therefore, before using the quantum efficiency tester to test the absorption characteristics of the back-contact battery to be measured for light of different wavelengths, it further includes:

[0095] Use light of different wavelengths emitted by the instrument light source of the quantum efficiency tester to pass through the light-transmitting component covering the light-receiving surface of the calibrator of the quantum efficiency tester;

[0096] Detect the actual light intensity of light of each wavelength through the calibrator of the quantum efficiency tester;

[0097] Calibrate the instrument light source according to the actual light intensity so that the light of each wavelength emitted by the instrument light source corresponds to the actual light intensity.

[0098] The specific calibration process can refer to Embodiment 1 and will not be elaborated here.

[0099] This embodiment uses a reference solar cell to detect the light intensity of the test light source, and cooperates with adjusting the output light intensity of the test light source, so that the light intensity of the light passing through the light-transmitting component is equal to the standard light intensity, improving the accuracy of the test results. In addition, after the test, the performance parameters of the measured back-contact battery are corrected according to the difference in the absorption characteristics between the back-contact battery and the reference solar cell.

[0100] In some embodiments, the back-contact battery to be measured can be first encapsulated. After encapsulation, the back-contact battery is flattened, and then the encapsulated back-contact battery can be electrically connected to the probe of the test device. Before using the adjusted test light source to irradiate the back-contact battery through the light-transmitting pressing member, it further includes:

[0101] Install the back-contact battery to be measured through the encapsulation component. Optionally, the encapsulation component includes a light-transmitting pressing member and an encapsulation frame disposed around the light-transmitting pressing member. The encapsulation frame can fix the edge of the back-contact battery to be measured by means of clamping, etc. The light-transmitting pressing member fits with the second surface of the back-contact battery to be measured. While the encapsulation frame fixes the back-contact battery, it cooperates with the light-transmitting pressing member to flatten the back-contact battery to be measured. After the test, the back-contact battery can be removed, and the encapsulation component can be used to encapsulate other back-contact batteries to be measured.

[0102] In this embodiment, the back-contact battery to be tested is encapsulated before testing. The encapsulation frame in the encapsulation component fixes the edge of the back-contact battery and, in cooperation with the light-transmitting pressing member, flattens the back-contact battery. The first surface of the encapsulated back-contact battery is relatively flat, facilitating its electrical connection to devices such as testing equipment or quantum efficiency testers. In addition, the encapsulation component fixes the back-contact battery in a detachable manner. After the test is completed, the back-contact battery can be removed and the encapsulation component can be reused.

[0103] In some embodiments, both the light-transmitting component and the light-transmitting pressing member are glass pressing members, and the glass pressing member has a light transmittance of greater than or equal to 90% for light with a wavelength greater than or equal to 300 nanometers and less than or equal to 1200 nanometers. Of course, users can also select other materials or light-transmitting materials with other optical properties to make the light-transmitting component and the light-transmitting pressing member as needed, which is not limited herein.

[0104] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present application. However, the present application is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present application, and these modifications and improvements are also regarded as the protection scope of the present application.

Claims

1. A testing method for a back-contact battery, wherein both the positive electrode and the negative electrode of the back-contact battery are disposed on a first surface, Characterized in that, Comprising: Making the light emitted by a testing light source pass through a light-transmitting component, and the light-transmitting rate of the light-transmitting component is the same as that of the light-transmitting pressing member on the back-contact battery; Adjusting the output light intensity of the testing light source so that the light intensity of the light emitted by the testing light source after passing through the light-transmitting component is equal to the standard light intensity; Using the adjusted testing light source to irradiate the back-contact battery through the light-transmitting pressing member to test the performance parameters of the back-contact battery under the standard light intensity.

2. The testing method according to claim 1, Characterized in that, Obtaining the standard light intensity includes: Using the light-transmitting pressing member as the light-transmitting component, and using the testing light source to irradiate the back-contact battery through the light-transmitting pressing member; Detecting the test light intensity response parameter of the back-contact battery under the irradiation of the testing light source; According to the test light intensity response parameter and the pre-obtained corresponding relationship between the light intensity response parameter of the back-contact battery and the output light intensity of the testing light source, adjusting the output light intensity of the testing light source so that the test light intensity response parameter is equal to the standard light intensity response parameter corresponding to the standard light intensity.

3. The testing method according to claim 1, Characterized in that, Obtaining the standard light intensity includes: Using the testing light source to irradiate the reference solar cell through the light-transmitting component covering the light-receiving surface of the reference solar cell; Detecting the test light intensity response parameter of the reference solar cell under the irradiation of the testing light source; According to the test light intensity response parameter and the pre-obtained corresponding relationship between the light intensity response parameter of the reference solar cell and the output light intensity of the testing light source, adjusting the output light intensity of the testing light source so that the test light intensity response parameter is equal to the standard light intensity response parameter corresponding to the standard light intensity.

4. The testing method according to claim 3, Characterized in that, After using the adjusted testing light source to irradiate the back-contact battery through the light-transmitting pressing member to test the performance parameters of the back-contact battery under the standard light intensity, further comprising: Testing the absorption characteristics of the back-contact battery to be tested for light of different wavelengths; Correcting the performance parameters according to the absorption characteristics.

5. The testing method according to claim 4, Characterized in that, The testing of the absorption characteristics of the back-contact battery to be tested for light of different wavelengths includes: Using the instrument light source of a quantum efficiency tester to emit light of different wavelengths to the back-contact battery to be tested; Detecting the absorption characteristics of the back-contact battery to be tested for light of different wavelengths.

6. The testing method according to claim 5, Characterized in that, Before using the quantum efficiency tester to test the absorption characteristics of the back-contact battery to be tested for light of different wavelengths, further comprising: Using the light of different wavelengths emitted by the instrument light source of the quantum efficiency tester to pass through the light-transmitting component covering the light-receiving surface of the calibrator of the quantum efficiency tester; Detecting the actual light intensity of the light of each wavelength through the calibrator. Calibrate the instrument light source according to the actual light intensity so that the light of each wavelength emitted by the instrument light source corresponds to the actual light intensity.

7. The test method according to any one of claims 1 to 6, characterized in that before using the adjusted test light source to irradiate the back contact battery through the light-transmitting pressing member, it further includes: installing the back contact battery to be tested through a packaging component, the packaging component includes the light-transmitting pressing member and a packaging frame arranged around the light-transmitting pressing member, the packaging frame is used to fix the edge of the back contact battery to be tested, and the light-transmitting pressing member is used to fit the second surface of the back contact battery to be tested to flatten the back contact battery to be tested; the second surface faces away from the first surface.

8. The test method according to any one of claims 1 to 6, characterized in that both the light-transmitting member and the light-transmitting pressing member are glass pressing members, and the glass pressing member has a light transmittance of greater than or equal to 90% for light with a wavelength greater than or equal to 300 nanometers and less than or equal to 1200 nanometers.

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