Battery piece test system and test method, storage medium and electronic equipment

Abstract

The invention provides a battery piece test system, a test method, a storage medium and electronic equipment. The test system comprises a light source used for irradiating a battery piece to be tested; the image acquisition assembly is located on the side, provided with the light source, of the to-be-detected battery piece and used for obtaining multiple images of the to-be-detected battery piece under irradiation of the light source, and the multiple images correspond to multiple illumination intensities of emergent light of the light source one to one; the processor is used for controlling the light source to irradiate the emergent light with the multiple illumination intensities to the to-be-detected battery piece, and is used for obtaining an open-circuit voltage value of a preset area of the to-be-detected battery piece at least according to the gray values of the multiple images; a non-contact measurement method is adopted in the process of measuring the open-circuit voltage value of the to-be-tested battery piece, the problem that the to-be-tested battery piece is broken due to the fact that a probe makes contact with the to-be-tested battery piece in the testing process is solved, and then the testing accuracy of the open-circuit voltage value of the to-be-tested battery piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a cell testing system, a testing method, a computer storage medium, a computer program product, an electronic device and a testing device. Background Art

[0002] Current solar cells require a probe to contact the cell to form an electrical circuit during voltage testing. Conductors such as probes or metal plates are needed to connect the cell to obtain the open-circuit voltage across the positive and negative electrodes. This is not conducive to testing full back-junction cells, and is also difficult to test other non-finished cell samples. If only the open-circuit voltage signal is tested, the open-circuit voltage distribution image of the cell cannot be obtained. Summary of the invention

[0003] The present application provides a battery cell testing system, testing method, computer storage medium, computer program product, electronic device and testing equipment to solve the problem in the related art that battery cells are easily broken and the test results are inaccurate during the process of testing the open circuit voltage of the battery.

[0004] According to one aspect of the present application, a cell testing system is provided, comprising: a light source for irradiating a cell to be tested; an image acquisition component, located on a side of the cell to be tested having the light source, for acquiring a plurality of images of the cell to be tested under the irradiation of the light source, the plurality of images corresponding one-to-one to a plurality of light intensities of an emitted light from the light source; a processor, electrically connected to the image acquisition component and the light source, respectively, for controlling the light source to irradiate the emitted light of a plurality of light intensities to the cell to be tested, and for obtaining an open circuit voltage value of a preset area of ​​the cell to be tested based at least on the grayscale values ​​of the plurality of images; wherein the preset area is the front side of the cell to be tested, or the back side of the cell to be tested, or a partial area of ​​the front side of the cell to be tested, or a partial area of ​​the back side of the cell to be tested.

[0005] Optionally, the processor is further used to obtain an open circuit voltage distribution image of a preset area based on the image captured by the image acquisition component; and / or, the processor is further used to determine the minority carrier lifetime of the battery cell to be tested based at least on the open circuit voltage value.

[0006] Optionally, the light source is any one or more of white light, laser and LED light.

[0007] Optionally, the wavelength range of the output light of the light source is between 200nm and 1500nm.

[0008] Optionally, a light intensity detection component is located on a side of the standard cell having a light source, and is used to detect the intensity of the emitted light of the light source; the processor is also electrically connected to the light intensity detection component, and is used to correct the open circuit voltage value of the cell to be tested based on the emitted light intensity and a third preset relationship, wherein the third preset relationship represents the relationship between multiple preset emitted light intensities and multiple second grayscale correction coefficients.

[0009] Optionally, the test system further comprises a first constant temperature cooling device and / or a second constant temperature cooling device, the first constant temperature cooling device is used to dissipate heat and cool the light source, and the second constant temperature cooling device is used to dissipate heat and cool the image acquisition component.

[0010] Optionally, the light source is also used to emit light to the standard cell to make the standard cell illuminate; the image acquisition component is also used to obtain a grayscale value image of the standard cell; the processor is also used to obtain a grayscale change value when the grayscale value image of the standard cell changes, and to correct the open circuit voltage value of the cell to be tested according to the grayscale change value.

[0011] Optionally, the test system also includes a temperature sensor, which is used to measure the temperature of the standard battery cell; the processor is electrically connected to the temperature sensor, and the processor is used to obtain the temperature data of the standard battery cell, and when the temperature data of the standard battery cell is within a preset range, obtain the grayscale change value when the grayscale value image of the standard battery cell changes, and is used to perform a second correction on the series resistance value of the battery cell to be tested according to the grayscale change value.

[0012] Optionally, the system further comprises a third constant temperature cooling device, which is used to dissipate heat and cool the standard battery cell.

[0013] Optionally, the test system also includes: a reflectometer, located on a side of the standard cell having an image acquisition component, the reflectometer being used to obtain the light reflectivity of the standard cell under a preset light intensity, the multiple light intensities including a preset light intensity; the processor is also electrically connected to the reflectometer, and is used to correct the grayscale values ​​of the multiple images at least based on the light reflectivity, so as to correct the open circuit voltage value of a preset area of ​​the cell to be tested.

[0014] Optionally, the testing system further includes a darkroom, and the light source, the image acquisition component and the processor are all arranged in the darkroom.

[0015] According to another aspect of the present application, a battery cell testing method is provided, which is applied to the processor of the above-mentioned test system, and the testing method includes: sending a first control signal to the light source in the test system, so that the light source irradiates the output light with at least one light intensity to the battery cell to be tested, so as to obtain multiple images of the battery cell to be tested under the irradiation of the light source sent by the image acquisition component in the test system, and the multiple images correspond one-to-one to the multiple light intensities of the output light of the light source; obtaining the open circuit voltage value of a preset area of ​​the battery cell to be tested at least according to the grayscale values ​​of the multiple images; wherein the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

[0016] Optionally, the processor obtains the open circuit voltage value of the battery cell to be tested based on the grayscale values ​​of multiple images, including: obtaining the grayscale values ​​of the battery cell to be tested under light of multiple light intensities based on the grayscale values ​​of multiple images; at least obtaining the open circuit voltage value of the battery cell to be tested based on the grayscale values ​​of multiple images.

[0017] Optionally, the testing method also includes: acquiring multiple pixel points in multiple images sent by the image acquisition component; obtaining multiple grayscale values ​​corresponding to the multiple pixel points at least based on the multiple pixel points; obtaining multiple open circuit voltage values ​​corresponding to the multiple grayscale values ​​at least based on the multiple grayscale values; and generating multiple open circuit voltage distribution images corresponding to the multiple pixel points based on the multiple open circuit voltage values ​​and the positions of the multiple pixel points in the multiple images.

[0018] Optionally, the testing method further comprises: obtaining the excess carrier concentration of the battery cell to be tested at least based on a plurality of open circuit voltage values; and obtaining the minority carrier lifetime of the battery cell to be tested at least based on the excess carrier concentration.

[0019] Optionally, the test system also includes a light intensity detection component, and the test method also includes: obtaining the light intensity of the output light of the light source under a preset light intensity detected by the light intensity detection component, the multiple light intensities including the preset light intensity; obtaining a second target grayscale correction coefficient based on the light intensity of the output light and a third preset relationship, wherein the third preset relationship represents the relationship between multiple preset light intensities of the output light and multiple second grayscale correction coefficients; correcting the grayscale value of the image corresponding to the preset light intensity according to the second target grayscale correction coefficient; and obtaining the open circuit voltage value of the battery cell to be tested at least based on the grayscale value of the image corresponding to the preset light intensity after correction.

[0020] Optionally, the test system also includes a reflectometer, and the test method also includes: receiving the light reflectivity of a preset light intensity of a standard battery cell obtained by the reflectometer, wherein the multiple light intensities include the preset light intensity; obtaining a target light intensity correction coefficient corresponding to the preset light intensity based on the light reflectivity and a first preset relationship, wherein the first preset relationship represents the relationship between multiple preset light reflectivities and multiple light intensity correction coefficients; obtaining a corrected light intensity corresponding to the preset light intensity based on the preset light intensity and the target light intensity correction coefficient; obtaining a first target grayscale correction coefficient based on the corrected light intensity and a second preset relationship, wherein the second preset relationship represents the relationship between multiple preset corrected light intensities and multiple first grayscale correction coefficients; correcting the grayscale value of the image corresponding to the preset light intensity based on the first target grayscale correction coefficient; and obtaining the open circuit voltage value of the battery cell to be tested based on at least the grayscale value of the image corresponding to the corrected preset light intensity.

[0021] Optionally, the testing system also includes a temperature sensor, and the testing method also includes: receiving temperature data of a standard battery cell acquired by the temperature sensor; obtaining a target quantum efficiency compensation coefficient based on the temperature data and a fourth preset relationship, wherein the fourth preset relationship represents a relationship between multiple preset temperatures and multiple quantum efficiency compensation coefficients; obtaining a corrected quantum efficiency based on the quantum efficiency of the standard battery cell and the target quantum efficiency compensation coefficient; and obtaining an open circuit voltage value of the battery cell to be tested at least based on the corrected quantum efficiency.

[0022] According to another aspect of the present application, a computer program product is provided. The computer program product includes a non-volatile computer-readable storage medium. The non-volatile computer-readable storage medium stores a computer program. The computer program is executed by a processor to perform the above-mentioned test method.

[0023] According to another aspect of the present application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned test method.

[0024] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing the above-mentioned test method.

[0025] According to yet another aspect of the present application, a testing device is provided, comprising the testing system as described above.

[0026] Through the technical solution of the present application, a battery cell testing system is provided, which includes a light source, an image acquisition component and a processor, wherein the image acquisition module obtains an image of the battery cell to be tested under the illumination of the light source, and the processor converts the above image into a corresponding grayscale value, and calculates the open-circuit voltage value of the battery cell to be tested according to the above grayscale value and a preset formula. In the process of measuring the open-circuit voltage value of the battery cell to be tested, a non-contact measurement method is adopted, which avoids the problem of the battery cell to be tested being broken due to the contact between the probe and the battery cell to be tested during the test process, thereby improving the test accuracy of the open-circuit voltage value of the battery cell to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 is a partial schematic diagram of a battery cell testing system provided according to an embodiment of the present application;

[0029] Figure 2 A hardware structure block diagram of a mobile terminal for executing a battery cell testing method provided in an embodiment of the present application is shown;

[0030] Figure 3 It is a flow chart of a battery cell testing method provided according to an embodiment of the present application.

[0031] The above drawings include the following reference numerals:

[0032] 10. Light source; 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device; 20. Image acquisition component; 30. Battery cell to be tested; 40. Light intensity detection component; 50. First constant temperature cooling device; 60. Second constant temperature cooling device; 70. Standard battery cell; 80. Temperature sensor; 90. Third constant temperature cooling device; 100. Reflectivity meter. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] In the related technology, current solar cells require probes to contact the cell to form an electrical circuit during voltage testing. Conductors such as probes or metal plates are required to connect the cell to obtain the open-circuit voltage at both ends of the positive and negative electrodes. This is not conducive to the testing of full back-junction cells, and it is also difficult to test other non-finished cell samples. If only the open-circuit voltage signal is tested, the open-circuit voltage distribution image of the cell cannot be obtained.

[0037] Therefore, research on the above issues is carried out. Figure 1 As shown, in an embodiment of the present application, a battery cell testing system is provided, such as Figure 1 As shown, the cell test system includes: a light source 10, for irradiating a cell 30 to be tested; an image acquisition component 20, located on a side of the cell 30 to be tested having the light source 10, for acquiring a plurality of images of the cell 30 to be tested under the irradiation of the light source 10, wherein the plurality of images correspond one to one with a plurality of illumination intensities of the emitted light of the light source 10; a processor, electrically connected to the image acquisition component 20 and the light source 10, respectively, for controlling the light source 10 to irradiate the emitted light of a plurality of illumination intensities to the cell 30 to be tested, and for obtaining an open circuit voltage value of a preset area of ​​the cell 30 to be tested based on at least the grayscale values ​​of the plurality of images; wherein the preset area is the front side of the cell 30 to be tested, or the back side of the cell 30 to be tested, or a partial area of ​​the front side of the cell 30 to be tested, or a partial area of ​​the back side of the cell 30 to be tested.

[0038] By using the above-mentioned battery cell testing system in the embodiment of the present application, multiple images of the battery cell to be tested under light irradiation are obtained through the image acquisition component, and the processor converts the above-mentioned images into corresponding grayscale values, and obtains the voltage value of the battery cell to be tested based on the above-mentioned grayscale values. In the process of measuring the open-circuit voltage value of the battery cell to be tested, a non-contact measurement method is adopted, which avoids the problem of the battery cell to be tested being broken due to the contact between the probe and the battery cell to be tested during the test process, thereby improving the test accuracy of the open-circuit voltage value of the battery cell to be tested.

[0039] like Figure 1 As shown, when the light source 10 in the above test system irradiates the light incident surface of the battery cell 30 to be tested, the battery cell 30 to be tested will generate photoluminescence, and the image acquisition component 20 acquires the image of the battery cell 30 to be tested, and the processor ( Figure 1 (not shown) obtain the corresponding grayscale value of the above-mentioned image of the battery cell to be tested, and then calculate the open circuit voltage value of the battery cell 30 to be tested according to a preset formula and the above-mentioned grayscale value.

[0040] The above preset formula is Where k is the Boltzmann constant, T is the temperature, and A i is the range factor, B is the photorecombination coefficient, n i is the intrinsic carrier concentration, I PL is the gray value of the image. In actual testing, the same type of battery cell 30 to be tested can be A i and the value of B is fixed.

[0041] like Figure 1 As shown, the light source 10 can be a uniform light source with adjustable light intensity, which can illuminate the front or back of the battery cell to be tested; the light source 10 can also be a white light, laser, LED light or other light source with uniform surface distribution, stable spectrum or wavelength, and the wavelength is usually within 200nm~1500nm, and its light intensity can be adjusted by the excitation voltage and voltage of the dimmer, and can also be adjusted by changing the irradiation distance of the light source 10, the attenuation filter, the light baffle or the opening and closing of the aperture.

[0042] The above-mentioned test system is applicable to various types of batteries, unmetallized batteries, semi-finished batteries, and the battery cells 30 to be tested can be classified by level according to the open circuit voltage value.

[0043] The above-mentioned image acquisition component 20 includes but is not limited to silicon-based CCD, InGaAs, InSb, HgCdTd and other detectors that can detect the luminescence characteristics of Si-based photovoltaic cells, and also includes photon detectors that can respond to radiation from other types of semiconductors (such as perovskite semiconductors). In addition, as an optional embodiment of the present application, the image acquisition component can be used to capture images of the cell to be tested and the standard cell under the irradiation of the light source, which is not specifically limited in the present application.

[0044] In some optional implementations, the processor is further configured to obtain multiple open circuit voltage values ​​according to the grayscale values ​​of the multiple images, wherein the multiple open circuit voltage values ​​correspond to the multiple light intensities one by one. Further, the processor may also fit a relationship curve between the light intensity and the open circuit voltage according to the multiple open circuit voltage values ​​and the multiple light intensities.

[0045] In addition, the processor can also obtain an open circuit voltage distribution image of a preset area according to the grayscale value of the image.

[0046] Exemplarily, taking image #A corresponding to light intensity #A as an example, the processor can determine the open circuit voltage corresponding to each pixel point based on the grayscale value of the pixel point in the preset area of ​​the image #A, and so on to determine the open circuit voltage corresponding to each pixel point, thereby determining the open circuit voltage distribution image of the preset area.

[0047] Exemplarily, taking the case where light intensity #B corresponds to image #B and light intensity #C corresponds to image #C, the processor can take the average of the grayscale values ​​of the same pixel point in the preset area in image #B and image #C to determine the open circuit voltage corresponding to the pixel point, and so on to determine the open circuit voltage corresponding to each pixel point, thereby determining the open circuit voltage distribution image of the preset area.

[0048] In addition, as a possible method, under the same light intensity, the image acquisition component can acquire multiple images, and determine the open circuit voltage corresponding to the light intensity based on the multiple images. For example, under light intensity #D, the image acquisition component acquires image #D and image #F, and the processor can determine the grayscale average value based on the grayscale of image #D and the grayscale of image #F, and then determine the open circuit voltage corresponding to the light intensity #D.

[0049] In addition, the processor is also used to determine the minority carrier lifetime of the battery cell to be tested based on at least the open circuit voltage value.

[0050] In the above optional implementation, the excess carrier concentration Δn of the battery cell is calculated according to the open circuit voltage value and the first preset formula; and the effective minority carrier lifetime τ of the battery cell is calculated according to the second preset formula. eff After obtaining the effective minority carrier lifetime, other parameter characteristics of the battery cell can be further analyzed, such as quantum efficiency and dark saturation voltage.

[0051] In the above optional implementation manner, the above first preset formula is: Among them, Δp is the set value, which is the excess carrier concentration of the cell to be tested at the edge of the depletion region, N A is the doping concentration, n i is the intrinsic carrier concentration, K is the Boltzmann constant; the second preset formula is: Where q is the electron charge, G ph is the photon generation rate, and W is the thickness of the cell to be tested.

[0052] In some optional embodiments, the wavelength range of the output light of the light source is between 200nm and 1500nm.

[0053] In the above optional implementation manner, the wavelength range of the above light source can better excite the holes in the irradiated area of ​​the battery cell to be tested, thereby obtaining a more accurate image grayscale value.

[0054] In some optional embodiments, the light source is any one or more of white light, laser and LED light.

[0055] In the above optional implementation manner, the present application does not specifically limit the type of light source, and it can irradiate the battery cell to be tested and enable the image acquisition component to acquire a grayscale image.

[0056] In some optional embodiments, such as Figure 1 As shown, the light intensity detection component 40 is located on the side of the standard battery cell 70 having the light source 10, and is used to detect the intensity of the emitted light of the light source 10; the processor is also electrically connected to the light intensity detection component 40, and is used to correct the open circuit voltage value of the battery cell 30 to be tested according to the emitted light intensity and the third preset relationship, wherein the third preset relationship represents the relationship between multiple preset emitted light intensities and multiple second grayscale correction coefficients.

[0057] In the above optional implementation manner, the battery cell testing system in the embodiment of the present application further includes a standard battery cell 70, such as Figure 1 As shown, the standard cell 70 is located on the light emitting side of the light source 10 and on one side of the cell 30 to be tested. Figure 1 As shown, during the operation of the test system, the illumination intensity of the light source 10 will also have a certain influence on the calculation of the open-circuit voltage value of the battery cell 30 to be tested. In order to obtain a more accurate grayscale value of the image of the battery cell 30 to be tested under the illumination of the light source 10, a light intensity detection component 40 is set in the test system. The light intensity detection component 40 obtains the intensity of the emitted light of the light source 10. The processor obtains a correction coefficient for the second grayscale value of the battery cell 30 to be tested based on the above-mentioned intensity of the emitted light and the third preset relationship, and obtains a corrected second grayscale value based on the above-mentioned correction coefficient. The above-mentioned corrected second grayscale value is a more accurate grayscale value of the image of the battery cell 30 to be tested under the illumination of the light source. The processor obtains the corrected open-circuit voltage value based on the above-mentioned grayscale value and the preset formula.

[0058] In the above optional implementation, if Figure 1As shown, the light intensity detection component 40 may include any one or more of a photoresistor, a photodiode, a photodiode and a photoelectric sensor. Those skilled in the art may reasonably select the type of light intensity detection component according to actual conditions, and this application does not make any specific limitation.

[0059] As another method, the image acquisition component can obtain an image of the standard cell under the illumination of the light source. Furthermore, the processor can determine the illumination intensity of the light source according to the grayscale value of the image of the standard cell under the illumination of the light source, and further obtain the open circuit voltage of the cell to be tested corresponding to the illumination intensity. It is understandable that the corresponding relationship between the grayscale value of the image of the standard cell and the illumination intensity is preset and stored in the processor.

[0060] In some optional embodiments, such as Figure 1 As shown, the test system further includes a first constant temperature cooling device 50 and / or a second constant temperature cooling device 60. The first constant temperature cooling device 50 is used to dissipate heat and cool the light source, and the second constant temperature cooling device 60 is used to dissipate heat and cool the image acquisition component.

[0061] In the above optional implementation, if Figure 1 As shown, the first constant temperature cooling device 50 can dissipate heat and cool the light source 10 to ensure that the light source 10 can continue to work at a basically constant temperature, thereby preventing the temperature of the light source 10 from rising after long-term operation, causing the intensity of the light emitted by the light source 10 to decay and causing inaccurate photoluminescence testing.

[0062] Specifically, Figure 1 As shown, the first constant temperature cooling device 50 can be a water-cooled cooling device, a semiconductor constant temperature cooling device or an air-cooled constant temperature cooling device, which is not specifically limited here.

[0063] In some embodiments, Figure 1 As shown, the first constant temperature cooling device 50 can be installed at the rear of the light source 10, or at the side of the light source 10 or other positions, as long as it can maintain the temperature of the light source 10 within a normal range to prevent the light source 10 from being too hot. The first constant temperature cooling device 50 can be connected to the processor ( Figure 1 ) is electrically connected to realize the start and stop control of the first constant temperature cooling device 50.

[0064] In the above optional implementation, if Figure 1 As shown, the second constant temperature cooling device 60 can dissipate heat and cool the image acquisition component 20 to ensure that the image acquisition component 20 can continue to work at a basically constant temperature, thereby preventing the image acquisition component 20 from increasing in temperature after working for a long time and causing the accuracy of the grayscale value image to decrease.

[0065] Specifically, the second constant temperature cooling device 60 may also be a water-cooled cooling device, a semiconductor constant temperature cooling device or an air-cooled constant temperature cooling device, which is not limited here. The second constant temperature cooling device 60 may be connected to the processor ( Figure 1 (not shown) is electrically connected to realize the start and stop control of the second constant temperature cooling device 60.

[0066] In some optional embodiments, such as Figure 1 As shown, the light source 10 is also used to emit light to the standard battery cell 70 to make the standard battery cell 70 emit light; the image acquisition component 20 is also used to obtain the grayscale value image of the standard battery cell 70; the processor is also used to obtain the grayscale change value when the grayscale value image of the standard battery cell 70 changes, and is used to correct the open circuit voltage value of the battery cell 30 to be tested according to the grayscale change value.

[0067] like Figure 1 As shown, by setting a standard battery cell 70 (which is also under the irradiation of the light source) below the light source 10 as a reference, when it is detected that the grayscale value image of the standard battery cell 70 has changed, it can be determined that the grayscale value image has changed due to certain external reasons (such as the light source temperature is too high, the image acquisition component 20 temperature is too high, etc.), and then it can be determined that the corresponding grayscale value of the image of the above-mentioned battery cell 30 to be tested has also changed accordingly. At this time, the grayscale value of the image of the battery cell 30 to be tested can be corrected according to the grayscale change value when the grayscale value image of the standard battery cell 70 changes, so as to obtain a more accurate grayscale value image of the battery cell 30 to be tested, further improve the accuracy of the grayscale value image, and ensure the accuracy of the open circuit voltage test.

[0068] Specifically, in such an embodiment, "standard battery cells" can be understood as semi-finished battery cells that have passed the inspection or qualified finished battery cells. There is no specific limitation here. Its purpose is to serve as a benchmark to determine whether the inspection environment has changed, resulting in errors in the inspection of the battery cells to be tested. When errors occur, the grayscale value of the image of the battery cell to be tested can be corrected by changing the grayscale value image of the standard battery cell. In the following text, if the same description appears, it can be understood by referring to this.

[0069] In addition, "the grayscale change value when the grayscale value image of the standard battery cell changes" refers to the grayscale difference between the grayscale value image of the standard battery cell after the change and the grayscale value image of the standard battery cell before the change, which can be the grayscale change value of a preset area on the standard battery cell, or the average value of the grayscale change values ​​of multiple points on the entire standard battery cell, and is not specifically limited here. It can be understood that the grayscale change value when the grayscale value image of the standard battery cell changes can be a positive value or a negative value.

[0070] When the grayscale of the grayscale value image of the standard battery cell changes, if the grayscale change value is a positive value, the corresponding grayscale change value can be added to the grayscale value of the battery cell image to be tested to obtain the final grayscale value image. If the grayscale change value is a negative value, the absolute value of the grayscale change value can be subtracted from the grayscale value of the battery cell image to obtain the final grayscale value image.

[0071] In some optional embodiments, such as Figure 1 As shown, the test system also includes a temperature sensor 80, which is used to measure the temperature of the standard battery cell 70; the processor is electrically connected to the temperature sensor 80, and the processor is used to obtain the temperature data of the standard battery cell 70, and when the temperature data of the standard battery cell 70 is within a preset range, obtain the grayscale change value when the grayscale value image of the standard battery cell 70 changes, and is used to perform a second correction on the series resistance value of the battery cell 30 to be tested according to the grayscale change value.

[0072] In the above optional implementation, if Figure 1 As shown, during the operation of the test system, when the light source 10 irradiates the incident surface of the battery cell 30 to be tested, the battery cell 30 to be tested may have a temperature change, or the voltage test of the battery cell 30 to be tested may be affected by the influence of the external temperature. In order to obtain a more accurate grayscale value of the image of the entire surface of the battery cell 30 to be tested under the irradiation of the light source, a temperature sensor 80 is set in the test system. The temperature sensor 80 monitors and obtains the real-time temperature data of the standard battery cell 70. The processor obtains the compensation coefficient of the open-circuit voltage of the battery cell 30 to be tested based on the above real-time temperature data. The processor calculates the corrected open-circuit voltage of the battery cell 30 to be tested based on the initial open-circuit voltage of the battery cell 30 to be tested and the compensation coefficient of the open-circuit voltage.

[0073] In the above optional implementation, if Figure 1 As shown, the temperature sensor 80 may include any one or more of a thermocouple, a thermistor, an infrared thermometer and a thermal imager. Those skilled in the art may reasonably select the type of temperature sensor according to actual conditions, and this application does not make any specific limitation.

[0074] As a possible approach, the temperature sensor can be set to monitor the temperature of the standard battery cell. When the temperature of the standard battery cell is within a preset range, it can be determined that the reason for the change in the grayscale value image of the standard battery cell is not due to the temperature of the standard battery cell, but due to other factors (for example, the increase in the temperature of the light source causes the light intensity to attenuate). In this case, the grayscale change value of the grayscale value image of the standard battery cell when it changes can be obtained, and the image captured by the image acquisition component can be corrected according to the grayscale change value to obtain a more accurate detection result.

[0075] In addition, the “preset range” may be the fluctuation range of the standard cell under normal temperature. For example, in some embodiments, the temperature of the standard cell in the test system as a reference and control may be the photoluminescence test temperature.

[0076] In such a case, if the temperature sensor detects that the temperature of the standard battery cell fluctuates within a small range, for example, fluctuates within 0.2°C above or below the target temperature, it can be determined that the cause of the change in the grayscale value image of the standard battery cell is not due to the temperature of the standard battery cell itself, but due to the increase in the temperature of the light source causing the light intensity to attenuate. In this case, the processor can correct the image captured by the image acquisition component according to the grayscale change value of the standard battery cell.

[0077] If the temperature sensor detects that the temperature of the standard battery cell exceeds the above-mentioned preset range, for example, is less than the minimum value of the preset range or greater than the maximum value of the preset range, it means that the reason for the change in the grayscale value image of the standard battery cell is the temperature of the standard battery cell. In this case, the grayscale change of the standard battery cell can be ignored first, and corrections can be made until the monitoring data of the temperature sensor is within the preset range.

[0078] In some optional embodiments, such as Figure 1 As shown, the system further includes a third constant temperature cooling device 90 , which is used to dissipate heat and cool the standard battery cell 70 .

[0079] In the above optional implementation, if Figure 1 As shown, the setting of the third constant temperature cooling device 90 can keep the standard battery cell 70 at a basically constant temperature (such as the target temperature mentioned above), thereby avoiding the phenomenon that the monitoring data of the temperature sensor 80 is outside the preset range, eliminating the gray value changes caused by the temperature of the standard battery cell 70 itself, and ensuring the accuracy of the correction.

[0080] Specifically, the third constant temperature cooling device 90 may also be a water-cooled cooling device, a semiconductor constant temperature cooling device or an air-cooled constant temperature cooling device, which is not specifically limited here. The third constant temperature cooling device 90 may be electrically connected to the processor to realize the start and stop control of the third constant temperature cooling device 90.

[0081] In some optional embodiments, such as Figure 1As shown, the test system also includes a reflectometer 100, which is located on a side of the standard cell 70 having the image acquisition component 20, and is used to obtain the light reflectivity of the standard cell 70 under a preset light intensity, wherein the multiple light intensities include a preset light intensity; the processor is also electrically connected to the reflectometer 100, and is used to correct the grayscale value of the image corresponding to the preset light intensity at least based on the light reflectivity, so as to correct the open circuit voltage value of the preset area of ​​the cell 30 to be tested.

[0082] In the above optional implementation, if Figure 1 As shown, when the light source 10 irradiates the cell 30 to be tested, the cell 30 to be tested will also generate some reflected light, which is interference light. In order to obtain a more accurate grayscale value of the image of the cell 30 to be tested under the irradiation of the light source 10, a reflectivity meter 100 is set in the test system, and the reflectivity meter 100 will obtain the reflectivity of the reflected light of the cell 30 to be tested. The processor corrects the grayscale value of the image of the cell 30 to be tested according to the reflectivity.

[0083] As a method, the gray value of the image after correction = the gray value of the image before correction - the gray value of the reflected light, wherein the gray value of the reflected light can be determined according to the reflectivity.

[0084] For example, assuming that the light intensity of the light source is 10, the quantum response is a, and the grayscale value of the image before correction is 10a; if the reflectivity is 2%, the grayscale value of the reflected light is 0.2a.

[0085] In the above optional implementation manner, the above reflectivity meter can be any one or more of a single-point reflectivity meter (with an integrating sphere) and a device for collecting reflection information (array light + camera). Those skilled in the art can reasonably select the type of reflectivity meter according to actual conditions, and this application does not make any specific limitation.

[0086] In some optional embodiments, the testing system further includes a darkroom, and the light source, image acquisition component and processor are all arranged in the darkroom.

[0087] In the above optional implementation manner, the setting of the darkroom can provide the above test system with an environment that will not be disturbed by external ambient light, thereby making the measurement result of the open circuit voltage more accurate.

[0088] Specifically, in such an embodiment, the darkroom may be, for example, a light-proof box, which is not specifically limited herein. In addition, in such an embodiment, the standard battery cell and the temperature sensor may also be disposed in the darkroom.

[0089] According to another embodiment of the present application, a battery cell testing method is also provided, which is applied to the processor of the above-mentioned testing system.

[0090] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0091] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 2 FIG. 1 is a hardware structure block diagram of a mobile terminal of a battery cell testing method according to an embodiment of the present invention. Figure 2 As shown, the mobile terminal may include one or more ( Figure 2 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 2 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 2 More or fewer components as shown, or with Figure 2 Different configurations are shown.

[0092] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the message data processing method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The above-mentioned specific network example may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly. In this embodiment, a method for processing message data running on a mobile terminal, a computer terminal or the like is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that here.

[0093] Figure 3 1 is a flow chart of a battery cell testing method according to an embodiment of the present application. Figure 3 As shown, the method comprises the following steps:

[0094] Step S1: Send a first control signal to the light source in the test system, so that the light source irradiates the output light with at least one light intensity to the battery cell to be tested, so as to obtain multiple images of the battery cell to be tested under the irradiation of the light source sent by the image acquisition component in the test system, and the multiple images correspond one-to-one to the multiple light intensities of the output light of the light source.

[0095] Specifically, after receiving the first control signal, the light source emits light with different illumination intensities to illuminate the light incident surface of the cell to be tested, and the image acquisition component performs multiple image acquisitions on the illuminated area of ​​the cell to be tested.

[0096] Step S2: obtaining the open circuit voltage value of a preset area of ​​the battery cell to be tested at least based on the grayscale values ​​of multiple images; wherein the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

[0097] For example, the preset area may be a two-slice area, a three-slice area, etc. of the battery cell to be tested, without limitation.

[0098] Specifically, the open circuit voltage value of the battery cell to be tested is calculated at least based on the grayscale value of the above-mentioned collected image and a preset formula, the above-mentioned preset formula is a formula pre-stored in, and the above-mentioned preset formula includes a first preset formula and a second preset formula.

[0099] The above-mentioned battery cell testing method in the embodiment of the present application is adopted. By using the image acquisition module in the battery cell testing system to obtain multiple images of the battery cell to be tested under the illumination of the light source, the processor will convert the above-mentioned images into corresponding grayscale values, and calculate the open-circuit voltage value of the battery cell to be tested according to the above-mentioned grayscale value and the preset formula. In the process of measuring the open-circuit voltage value of the battery cell to be tested, a non-contact measurement method is adopted, which avoids the problem of the battery cell to be tested being broken due to the contact between the probe and the battery cell to be tested during the test process, thereby improving the test accuracy of the open-circuit voltage value of the battery cell to be tested.

[0100] In some optional embodiments, the processor obtains the open circuit voltage value of the battery cell to be tested based on the grayscale values ​​of multiple images, including: obtaining the grayscale values ​​of the battery cell to be tested under light of multiple light intensities based on the grayscale values ​​of multiple images; at least obtaining the open circuit voltage value of the battery cell to be tested based on the grayscale values ​​of multiple images.

[0101] In the above optional implementation, the grayscale values ​​corresponding to the multiple images are multiple grayscale values ​​of the tested cell under light of multiple light intensities, and the open circuit voltage value of the tested cell is obtained according to the grayscale value and a preset formula.

[0102] The above preset formula is Where k is the Boltzmann constant, T is the temperature, and A i is the range factor, B is the photorecombination coefficient, n i is the intrinsic carrier concentration, I PL is the gray value of the image. In actual testing, the same type of battery cell 30 to be tested can be A i and the value of B is fixed.

[0103] In some optional embodiments, the testing method also includes: acquiring multiple pixel points in multiple images sent by the image acquisition component; obtaining multiple grayscale values ​​corresponding to the multiple pixel points at least based on the multiple pixel points; obtaining multiple open circuit voltage values ​​corresponding to the multiple grayscale values ​​at least based on the multiple grayscale values; generating multiple open circuit voltage distribution images corresponding to the multiple pixel points based on the multiple open circuit voltage values ​​and the positions of the multiple pixel points in the multiple images.

[0104] In the above optional embodiment, there are multiple pixel points in the image acquired by the image acquisition component, each pixel point represents a small area on the battery cell to be tested, and the multiple pixel points are corresponded one-to-one with multiple grayscale values, and the multiple grayscale values ​​are corresponded one-to-one with multiple open-circuit voltage values, so that a distribution image of multiple open-circuit voltages corresponding to the multiple pixel points can be obtained.

[0105] In some optional embodiments, the testing method further comprises: obtaining the excess carrier concentration of the battery cell to be tested based on at least a plurality of open circuit voltage values; and obtaining the minority carrier lifetime of the battery cell to be tested based on at least the excess carrier concentration.

[0106] In the above optional implementation, the excess carrier concentration of the battery cell to be tested can be calculated according to the open circuit voltage and the first preset formula, and the minority carrier lifetime of the battery cell to be tested can be calculated according to the excess carrier concentration and the second preset formula; the first preset formula is: Where Δp is the excess carrier concentration of the cell under test at the edge of the depletion region, N A is the doping concentration, ni is the intrinsic carrier concentration, and K is the Boltzmann constant; the second preset formula is: Where q is the electron charge, G ph is the photon generation rate, and W is the thickness of the cell to be tested.

[0107] In some optional embodiments, the test system also includes a light intensity detection component, and the test method also includes: obtaining the light intensity of the output light of the light source under a preset light intensity detected by the light intensity detection component, the multiple light intensities including the preset light intensity; obtaining a second target grayscale correction coefficient based on the light intensity of the output light and a third preset relationship, wherein the third preset relationship represents the relationship between multiple preset light intensities of the output light and multiple second grayscale correction coefficients; correcting the grayscale value of the image corresponding to the preset light intensity according to the second target grayscale correction coefficient; and obtaining the open circuit voltage value of the battery cell to be tested at least based on the grayscale value of the image corresponding to the preset light intensity after correction.

[0108] In the above optional implementation manner, during the operation of the test system, the illumination intensity of the light source will also have a certain influence on the open circuit voltage test of the battery cell to be tested. In order to obtain a more accurate grayscale value of the image of the entire surface of the battery cell to be tested under the illumination of the light source, so as to improve the accuracy of the open circuit voltage test results of the battery cell to be tested, a light intensity detection component can be set in the test system, and the light intensity detection component can be used to obtain the intensity of the output light of the light source, so as to use the intensity of the output light to realize the correction of the voltage value of the battery cell to be tested.

[0109] Specifically, based on the above-mentioned emitted light intensity and the third preset relationship, a correction coefficient of the second target grayscale value of the battery cell to be tested is obtained, and the corrected second target grayscale value is obtained based on the above-mentioned correction coefficient. The above-mentioned corrected second target grayscale value is a more accurate grayscale value of the image of the battery cell to be tested under the illumination of the light source, and the corrected open circuit voltage value is obtained based on the above-mentioned grayscale value and the preset formula.

[0110] In some optional embodiments, the test system also includes a reflectometer, and the test method also includes: receiving the light reflectivity of a preset light intensity of a standard battery cell obtained by the reflectometer, wherein the multiple light intensities include the preset light intensity; obtaining a target light intensity correction coefficient corresponding to the preset light intensity based on the light reflectivity and a first preset relationship, wherein the first preset relationship represents the relationship between multiple preset light reflectivities and multiple light intensity correction coefficients; obtaining a corrected light intensity corresponding to the preset light intensity based on the preset light intensity and the target light intensity correction coefficient; obtaining a first target grayscale correction coefficient based on the corrected light intensity and a second preset relationship, wherein the second preset relationship represents the relationship between multiple preset corrected light intensities and multiple first grayscale correction coefficients; correcting the grayscale value of the image corresponding to the preset light intensity based on the first target grayscale correction coefficient; and obtaining the open circuit voltage value of the battery cell to be tested based on at least the grayscale value of the image corresponding to the corrected preset light intensity.

[0111] In the above optional implementation, when the light source illuminates the battery cell to be tested, the battery cell to be tested will also generate some reflected light. The above reflected light is interference light. In order to obtain a more accurate grayscale value of the entire image of the battery cell to be tested under the illumination of the light source, so as to improve the accuracy of the voltage test result of the battery cell to be tested, a reflectivity meter can be set in the test system, and the reflectivity meter can be used to obtain the reflectivity of the reflected light of the battery cell to be tested, so as to use the reflectivity to realize the correction of the voltage value of the battery cell to be tested.

[0112] Specifically, based on the reflectivity of the above-mentioned reflected light and the first preset relationship, a target illumination correction coefficient corresponding to the preset light intensity is obtained, the first preset relationship is the relationship between the preset light reflectivity and the illumination correction coefficient, and the grayscale information corresponding to the reflected light is obtained according to the target illumination correction coefficient and the second preset relationship. The above-mentioned grayscale value information represents the first grayscale correction coefficient. The first grayscale value is corrected according to the above-mentioned grayscale information to obtain a corrected first grayscale value. The above-mentioned corrected first grayscale value is a more accurate grayscale value of the image of the battery cell to be tested under the irradiation of a light source with a preset light intensity. The corrected open circuit voltage value is obtained according to the above-mentioned grayscale value and the preset formula.

[0113] In some optional embodiments, the testing system also includes a temperature sensor, and the testing method also includes: receiving temperature data of a standard battery cell acquired by the temperature sensor; obtaining a target quantum efficiency compensation coefficient based on the temperature data and a fourth preset relationship, wherein the fourth preset relationship represents a relationship between multiple preset temperatures and multiple quantum efficiency compensation coefficients; obtaining a corrected quantum efficiency based on the quantum efficiency of the standard battery cell and the target quantum efficiency compensation coefficient; and obtaining an open circuit voltage value of the battery cell to be tested at least based on the corrected quantum efficiency.

[0114] The testing method in the embodiment of the present application also includes: receiving temperature data of a standard battery cell acquired by a temperature sensor; obtaining a target quantum efficiency compensation coefficient based on the temperature data and a fourth preset relationship, wherein the fourth preset relationship represents a relationship between multiple preset temperatures and multiple quantum efficiency compensation coefficients; obtaining a corrected quantum efficiency based on the quantum efficiency of the standard battery cell and the target quantum efficiency compensation coefficient; and obtaining an open circuit voltage value of the battery cell to be tested based on the corrected quantum efficiency.

[0115] In the above optional implementation manner, during the operation of the test system, when the light source is irradiated on the incident surface of the battery cell to be tested, the battery cell to be tested may have a temperature change, or the quantum efficiency of the battery cell to be tested may be affected by the influence of the external temperature. In order to avoid the influence of the quantum efficiency change of the battery cell to be tested on its open circuit voltage test, a temperature sensor may be provided in the test system, and the temperature data of the standard battery cell may be monitored and acquired by the temperature sensor, so that the quantum efficiency of the battery cell to be tested can be compensated by using the temperature data.

[0116] Specifically, the compensation coefficient of the quantum efficiency of the standard battery cell is obtained according to the above-mentioned temperature data and the fourth preset relationship. The above-mentioned preset formula includes a first preset formula and a second preset formula. The quantum efficiency of the battery cell to be tested is calculated according to the initial grayscale value of the battery cell to be tested and the first preset formula, and then the corrected quantum efficiency of the battery cell to be tested is calculated according to the above-mentioned quantum efficiency and the compensation coefficient of the quantum efficiency. The open circuit voltage value of the battery cell to be tested is calculated according to the above-mentioned corrected quantum efficiency and the second preset formula.

[0117] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program that is initialized with at least the following method steps: sending a first control signal to a light source in a test system so that the light source irradiates output light having at least one light intensity to a battery cell to be tested, respectively, so as to obtain a plurality of images of the battery cell to be tested under the irradiation of the light source, which are sent by an image acquisition component in the test system, and the plurality of images correspond one-to-one to a plurality of light intensities of the output light of the light source; obtaining an open circuit voltage value of a preset area of ​​the battery cell to be tested based at least on the grayscale values ​​of the plurality of images; wherein the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

[0118] According to another aspect of the present application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned battery cell testing method.

[0119] Specifically, the battery cell testing method includes:

[0120] Step S1: Send a first control signal to the light source in the test system, so that the light source irradiates the output light with at least one light intensity to the battery cell to be tested, so as to obtain multiple images of the battery cell to be tested under the irradiation of the light source sent by the image acquisition component in the test system, and the multiple images correspond one-to-one to the multiple light intensities of the output light of the light source.

[0121] Specifically, after receiving the first control signal, the light source emits light with different illumination intensities to illuminate the light incident surface of the cell to be tested, and the image acquisition component performs multiple image acquisitions on the illuminated area of ​​the cell to be tested.

[0122] Step S2: obtaining the open circuit voltage value of a preset area of ​​the battery cell to be tested at least based on the grayscale values ​​of multiple images; wherein the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

[0123] For example, the preset area may be a two-slice area, a three-slice area, etc. of the battery cell to be tested, without limitation.

[0124] Specifically, the open circuit voltage value of the battery cell to be tested is calculated at least based on the grayscale value of the above-mentioned collected image and a preset formula, the above-mentioned preset formula is a formula pre-stored in, and the above-mentioned preset formula includes a first preset formula and a second preset formula.

[0125] The above-mentioned battery cell testing method in the embodiment of the present application is adopted. By using the image acquisition module in the battery cell testing system to obtain multiple images of the battery cell to be tested under the illumination of the light source, the processor will convert the above-mentioned images into corresponding grayscale values, and calculate the open-circuit voltage value of the battery cell to be tested according to the above-mentioned grayscale value and the preset formula. In the process of measuring the open-circuit voltage value of the battery cell to be tested, a non-contact measurement method is adopted, which avoids the problem of the battery cell to be tested being broken due to the contact between the probe and the battery cell to be tested during the test process, thereby improving the test accuracy of the open-circuit voltage value of the battery cell to be tested.

[0126] According to another aspect of the present application, an embodiment of the present invention provides an electronic device, the device including a processor, a memory and a program stored in the memory and executable on the processor, wherein the processor implements at least the following steps when executing the program: sending a first control signal to a light source in a test system so that the light source irradiates output light having at least one light intensity to a battery cell to be tested, respectively, so as to obtain a plurality of images of the battery cell to be tested under the irradiation of the light source, sent by an image acquisition component in the test system, wherein the plurality of images correspond one-to-one to a plurality of light intensities of the output light of the light source; obtaining an open circuit voltage value of a preset area of ​​the battery cell to be tested based at least on the grayscale values ​​of the plurality of images; wherein the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

[0127] According to yet another aspect of the present application, an embodiment of the present invention further provides a testing device, including the testing system as in the aforementioned embodiment.

[0128] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0129] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0130] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0132] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0133] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0134] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0135] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0136] By using the above-mentioned battery cell testing system in the embodiment of the present application, multiple images of the battery cell to be tested under light irradiation are obtained through the image acquisition component, and the processor converts the above-mentioned images into corresponding grayscale values, and obtains the voltage value of the battery cell to be tested based on the above-mentioned grayscale values. In the process of measuring the open-circuit voltage value of the battery cell to be tested, a non-contact measurement method is adopted, which avoids the problem of the battery cell to be tested being broken due to the contact between the probe and the battery cell to be tested during the test process, thereby improving the test accuracy of the open-circuit voltage value of the battery cell to be tested.

[0137] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0138] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A battery cell testing system, characterized in that: include: A light source, used to illuminate the battery cell to be tested; An image acquisition component, located on a side of the cell to be tested having the light source, for acquiring a plurality of images of the cell to be tested under the illumination of the light source, wherein the plurality of images correspond one to one to a plurality of illumination intensities of the light emitted by the light source; A processor, electrically connected to the image acquisition component and the light source, respectively, for controlling the light source to irradiate the output light of the multiple light intensities to the cell to be tested, and for obtaining an open circuit voltage value of a preset area of ​​the cell to be tested at least according to the grayscale values ​​of the multiple images; Wherein, the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

2. The test system according to claim 1, characterized in that: The processor is further used to obtain an open circuit voltage distribution image of the preset area based on the image captured by the image acquisition component; and / or, the processor is further used to determine the minority carrier lifetime of the battery cell to be tested based at least on the open circuit voltage value.

3. The test system according to claim 1, characterized in that: The light source is any one or more of white light, laser and LED light.

4. The test system according to claim 3, characterized in that: The wavelength range of the emitted light of the light source is between 200nm and 1500nm.

5. The test system according to claim 1, characterized in that: The test system further comprises: A light intensity detection component, located on a side of the standard cell having the light source, for detecting the intensity of the light emitted by the light source; The processor is also electrically connected to the light intensity detection component, and is used to correct the open circuit voltage value of the battery cell to be tested according to the output light intensity and a third preset relationship, wherein the third preset relationship represents the relationship between multiple preset output light intensities and multiple second grayscale correction coefficients.

6. The test system according to claim 1, characterized in that: The test system further comprises a first constant temperature cooling device and / or a second constant temperature cooling device, wherein the first constant temperature cooling device is used for dissipating heat and cooling the light source, and the second constant temperature cooling device is used for dissipating heat and cooling the image acquisition component.

7. The test system according to claim 1, characterized in that: The light source is also used to emit light to the standard cell to make the standard cell emit light; The image acquisition component is also used to obtain the gray value image of the standard battery cell; The processor is further used to obtain a grayscale change value when the grayscale value image of the standard battery cell changes, and to correct the open circuit voltage value of the battery cell to be tested according to the grayscale change value.

8. The test system according to claim 7, characterized in that: The test system also includes a temperature sensor, which is used to measure the temperature of the standard battery cell; the processor is electrically connected to the temperature sensor, and is used to obtain temperature data of the standard battery cell, and when the temperature data of the standard battery cell is within a preset range, obtain a grayscale change value when the grayscale value image of the standard battery cell changes, and is used to perform a second correction on the series resistance value of the battery cell to be tested according to the grayscale change value.

9. The test system according to claim 8, characterized in that: The system further comprises a third constant temperature cooling device, and the third constant temperature cooling device is used for dissipating heat and cooling the standard battery cell.

10. The test system according to claim 1 or 7, characterized in that: The test system further includes: a reflectometer, located on a side of the standard cell having the image acquisition component, the reflectometer being used to obtain the light reflectivity of the standard cell under a preset light intensity, wherein the multiple light intensities include the preset light intensity; The processor is also electrically connected to the reflectometer, and is used to correct the grayscale values ​​of the multiple images at least according to the light reflectivity, so as to correct the open circuit voltage value of the preset area of ​​the battery cell to be tested.

11. The test system according to any one of claims 1 to 9, characterized in that: The testing system further comprises a darkroom, wherein the light source, the image acquisition component and the processor are all arranged in the darkroom.

12. A method for testing a battery cell, characterized in that: In a processor of a test system according to any one of claims 1 to 11, the test method comprises: Sending a first control signal to the light source in the test system, so that the light source irradiates the output light with at least one light intensity to the battery cell to be tested, so as to obtain a plurality of images of the battery cell to be tested under the irradiation of the light source sent by the image acquisition component in the test system, wherein the plurality of images correspond one to one to the plurality of light intensities of the output light of the light source; Obtaining an open circuit voltage value of a preset area of ​​the battery cell to be tested at least according to the grayscale values ​​of the multiple images; Wherein, the preset area is the front side of the battery cell to be tested, or the back side of the battery cell to be tested, or a partial area of ​​the front side of the battery cell to be tested, or a partial area of ​​the back side of the battery cell to be tested.

13. The testing method according to claim 12, characterized in that: The processor obtains the open circuit voltage value of the battery cell to be tested according to the grayscale values ​​of the multiple images, including: According to the grayscale values ​​of the multiple images, respectively obtaining the grayscale values ​​of the cell to be tested under the illumination of the multiple illumination intensities; The open circuit voltage value of the battery cell to be tested is obtained at least according to the grayscale values ​​of the multiple images.

14. The testing method according to claim 12, characterized in that: The test method also includes: Acquire a plurality of pixel points in the plurality of images sent by the image acquisition component; At least according to the plurality of pixel points, obtain a plurality of grayscale values ​​corresponding to the plurality of pixel points one by one; At least according to the plurality of grayscale values, obtaining a plurality of open circuit voltage values ​​corresponding one to one to the plurality of grayscale values; A plurality of open circuit voltage distribution images corresponding to the plurality of pixels are generated according to the plurality of open circuit voltage values ​​and the positions of the plurality of pixels in the plurality of images.

15. The testing method according to claim 12, characterized in that: The test method also includes: Obtaining the excess carrier concentration of the battery cell to be tested at least according to the multiple open circuit voltage values; The minority carrier lifetime of the cell to be tested is obtained at least according to the excess carrier concentration.

16. The testing method according to claim 12, characterized in that: The test system further includes a light intensity detection component, and the test method further includes: Acquire the light intensity of the emitted light of the light source under a preset light intensity detected by the light intensity detection component, wherein the multiple light intensities include the preset light intensity; Obtaining a second target grayscale correction coefficient according to the light intensity of the emitted light and a third preset relationship, wherein the third preset relationship represents a relationship between a plurality of preset light intensities of the emitted light and a plurality of second grayscale correction coefficients; Correcting the grayscale value of the image corresponding to the preset light intensity according to the second target grayscale correction coefficient; The open circuit voltage value of the cell to be tested is obtained at least according to the grayscale value of the image corresponding to the preset light intensity after correction.

17. The testing method according to claim 12, characterized in that: The testing system further includes a reflectometer, and the testing method further includes: Receiving the light reflectance of a preset light intensity of a standard cell obtained by the reflectance meter, wherein the multiple light intensities include the preset light intensity; According to the light reflectivity and a first preset relationship, a target light intensity correction coefficient corresponding to the preset light intensity is obtained, wherein the first preset relationship represents a relationship between a plurality of preset light reflectivities and a plurality of light intensity correction coefficients; According to the preset light intensity and the target light intensity correction coefficient, a corrected light intensity corresponding to the preset light intensity is obtained; Obtaining a first target grayscale correction coefficient according to the corrected light intensity and a second preset relationship, wherein the second preset relationship represents a relationship between a plurality of preset corrected light intensities and a plurality of first grayscale correction coefficients; Correcting the grayscale value of the image corresponding to the preset light intensity according to the first target grayscale correction coefficient; The open circuit voltage value of the cell to be tested is obtained at least according to the grayscale value of the image corresponding to the preset light intensity after correction.

18. The testing method according to claim 12, characterized in that: The test system further includes a temperature sensor, and the test method further includes: Receiving temperature data of a standard battery cell acquired by the temperature sensor; Obtaining a target quantum efficiency compensation coefficient according to the temperature data and a fourth preset relationship, wherein the fourth preset relationship represents a relationship between a plurality of preset temperatures and a plurality of quantum efficiency compensation coefficients; Obtaining a corrected quantum efficiency according to the quantum efficiency of the standard cell and the target quantum efficiency compensation coefficient; At least according to the corrected quantum efficiency, the open circuit voltage value of the battery cell to be tested is obtained.

19. A computer program product, characterized in that The computer program product comprises a non-volatile computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to perform the testing method according to any one of claims 12 to 18.

20. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the test method according to any one of claims 12 to 18.

21. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing the test method described in any one of claims 12 to 18.

22. A testing device, characterized in that: Comprising a test system as claimed in any one of claims 1 to 11.

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