A BC 0BB cell testing device

Abstract

The utility model relates to a kind of BC 0BB battery piece testing device, including whole-row test unit and test strip main body structure, whole-row test unit is formed by the cross arrangement of 20 N area test strips and 20 P area test strips, further including that each N area test strip contains test strip main body structure, convergence type probe structure, telescopic mechanism and N area pressing strip, each P area test strip contains test strip main body structure, convergence type probe structure, telescopic mechanism and P area pressing strip, convergence type probe structure is set on test strip main body structure, telescopic mechanism is set on convergence type probe structure, N area pressing strip is set below telescopic mechanism, for with BC 0BB battery back N area fine grid contact, P area pressing strip is set below telescopic mechanism;The novel adopts back whole-row contact, front no shelter, EL / PL imaging is clear without shadow, cooperate visual alignment and elastic compression joint, improve test precision and defect detection rate.

Description

Technical Field

[0001] This utility model relates to the field of battery cell testing technology, specifically a BC 0BB battery cell testing device. Background Technology

[0002] In the photovoltaic cell production process, electrical performance parameter testing is a key step in evaluating cell quality and performance. Its core lies in obtaining parameters such as current and voltage by contacting the cell electrodes with probes to determine indicators such as cell conversion efficiency and electrical stability. With the iteration of photovoltaic technology, cell structure has evolved from the traditional main grid design to the OBB (no main grid) design, and the testing methods also need to adapt to the changes in electrode structure.

[0003] In common solar cell testing equipment, electrical performance testing is usually performed using a front-facing probe contact method. The probe or probe holder is directly located on the front of the solar cell. When performing electroluminescence (EL) testing, these metal probes block the illumination of the excitation light source, causing the shaded areas on the solar cell surface to be unable to generate light signals. This results in striped or dotted shadow areas corresponding to the probe positions in the final image. These shadows can cover up existing defects in the solar cell, such as microcracks, local short circuits, low minority carrier lifetime, or material inhomogeneity, leading to misjudgments or missed detections. This seriously affects the accuracy of defect identification and the reliability of product quality assessment. This problem is particularly prominent in high-efficiency solar cells such as BC 0BB structures, where the grid is dense, hindering the realization of high-precision online testing. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a BC 0BB battery cell testing device. The back side testing is unobstructed, the EL / PL imaging is clear, and the pressure bar makes precise contact with the fine grid. Combined with elastic pressing, it improves the accuracy of electrical performance measurement. This solves the problem that common testing devices often have front probes that block the light source, causing stripes and shadows in the EL imaging, which cover up defects such as hidden cracks and microcracks, leading to missed detections and misjudgments, thus affecting the accuracy of the test.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a BC 0BB battery cell testing device, comprising a row of testing units and a test strip main structure. The row of testing units consists of 20 N-area test strips and 20 P-area test strips arranged in a cross pattern. Each N-area test strip includes a test strip main structure, a busbar probe structure, a telescopic mechanism, and an N-area pressure strip. Each P-area test strip includes a test strip main structure, a busbar probe structure, a telescopic mechanism, and a P-area pressure strip.

[0006] The busbar probe structure is mounted on the main structure of the test strip, and the telescopic mechanism is mounted on the busbar probe structure. The N-zone pressure strip is located below the telescopic mechanism and is used to contact the N-zone fine grid on the back of the BC 0BB battery. The P-zone pressure strip is located below the telescopic mechanism and is used to contact the P-zone fine grid on the back of the BC 0BB battery. When the entire row of test units is pressed down, the N-zone pressure strip and the P-zone pressure strip contact the surface of the battery cell through the telescopic mechanism. The electrical signal is transmitted to the busbar probe structure through the N-zone pressure strip or the P-zone pressure strip and output to the external acquisition system.

[0007] Furthermore, the N-zone pressure strip and the P-zone pressure strip are each provided with 200 contacts. The contacts are raised structures with a width of 0.5 mm, a length of 5 mm, a raised height of 0.5 mm, and a spacing of 0.8 mm between adjacent contacts.

[0008] Furthermore, the surfaces of the main structure of the test strip, the busbar probe structure, the telescopic mechanism, the N-zone pressure strip, and the P-zone pressure strip are all plated with gold.

[0009] Furthermore, the telescopic mechanism includes a pressure rod installed on the main structure of the test strip. The telescopic mechanism has a cylindrical hole, through which the pressure rod passes and cooperates with the telescopic mechanism. When pressed down, pressure is applied to the N-zone and P-zone pressure strips.

[0010] Furthermore, the number of contacts on the N-zone pressure strip is the same as the number of fine grids on the back of the BC 0BB battery, and the number of contacts on the P-zone pressure strip is the same as the number of fine grids in the P-zone. The position of the contacts corresponds to the position of the fine grids.

[0011] Furthermore, the entire test unit captures images of the battery cell edges using a four-camera system and compares them with pre-stored N / P area distribution patterns to adjust the alignment of the N and P area pressure strips with the battery cell.

[0012] Furthermore, the entire row of test units is set on the back of the solar cell. When there is no obstruction on the front of the solar cell during the test, the EL or PL imaging device acquires images from the front.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] 1. Since the entire row of test units is set on the back of the solar cell, there are no probes or structures obstructing the front of the solar cell during the test. When performing electroluminescence or photoluminescence detection, the light source can uniformly illuminate the entire front surface, and there are no striped shadows in the imaging area. This allows for the complete and clear capture of various defects such as microcracks, hidden cracks, local short circuits, and material inhomogeneity inside the solar cell, thereby improving the accuracy of quality inspection.

[0015] 2. The testing device makes one-to-one contact between the N-zone and P-zone pressure strips and the fine grids of the N / P-zone on the back of the battery. With the help of the telescopic mechanism, a stable pressure connection is achieved, avoiding resistance loss caused by poor contact. At the same time, because there is no obstruction on the front, the lighting conditions are real and complete, which effectively avoids the problem of low short-circuit current caused by probe shading in the traditional method. This makes the measurement of key parameters such as open-circuit voltage, short-circuit current, fill factor and conversion efficiency closer to the true value, with a measurement deviation of ≤0.05%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a top-view three-dimensional structural diagram of the present invention;

[0018] Figure 3 This is a three-dimensional structural diagram of the location of the N-zone test strip of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the location of the test strip in area P of this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the part of this utility model.

[0021] In the diagram: 1. Main structure of the test strip; 2. Busbar probe structure; 3. Telescopic mechanism; 301. Pressure bar; 4. N-zone test strip; 401. N-zone pressure bar; 5. P-zone test strip; 501. P-zone pressure bar. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please refer to the figure. Figures 1-5 This embodiment of a BC 0BB battery cell testing device includes a row of testing units and a test strip main structure 1. The row of testing units is composed of N-zone test strips 4 and P-zone test strips 5 arranged in a cross pattern. Each N-zone test strip 4 includes a test strip main structure 1, a fixing module, a busbar probe structure 2, a telescopic mechanism 3, and an N-zone pressure strip 401. Each P-zone test strip 5 includes a test strip main structure 1, a fixing module, a busbar probe structure 2, a telescopic mechanism 3, and a P-zone pressure strip 501. The test strip main structure 1 is used to support the entire test strip and is fixed to the test module frame through mounting holes or slots at both ends to achieve positioning and assembly.

[0024] In this embodiment, a row of test units is used on the back, with no obstruction on the front, and no shadows in the EL / PL imaging, which can completely detect battery defects. The N-area pressure strip 401 and the P-area pressure strip 501 are in one-to-one contact with the fine grid on the back, and are stably pressed together with the telescopic mechanism 3. Combined with the unobstructed test environment, the measurement accuracy of parameters such as open circuit voltage, short circuit current, fill factor and efficiency is improved.

[0025] Please see Figures 1-5 In this embodiment, to ensure that there is no structural obstruction on the front of the battery during testing, the illumination is uniform, the EL / PL image is clear and shadow-free, and various defects such as microcracks and short circuits can be effectively detected, the busbar probe structure 2 is set on the main structure 1 of the test strip, the telescopic mechanism 3 is set on the busbar probe structure 2, the N-zone pressure strip 401 is set below the telescopic mechanism 3 for contacting the N-zone fine grid on the back of the BC 0BB battery, and the P-zone pressure strip 501 is set below the telescopic mechanism 3 for contacting the P-zone fine grid on the back of the BC 0BB battery. When the entire row of test units is pressed down, the N-zone pressure strip 401 and the P-zone pressure strip 501 contact the surface of the battery cell through the telescopic mechanism 3. The electrical signal is transmitted to the busbar probe structure 2 through the N-zone pressure strip 401 or the P-zone pressure strip 501 and output to the external acquisition system. The telescopic mechanism 3 includes a pressure rod 301, which passes through and cooperates with the cylindrical hole on the telescopic mechanism 3 to drive the N-zone pressure strip 401 and the P-zone pressure strip 501 to contact the battery cell when pressed down.

[0026] It should be noted that the bus probe structure 2 is a conductive metal strip used to collect and aggregate the electrical signals from multiple N-area test strips 4 or P-area test strips 5 before outputting them to an external acquisition system, thereby achieving parallel acquisition and signal integration.

[0027] In this embodiment, the main structure 1 of the test strip is used to support the overall test strip and achieve installation and fixation. The busbar probe structure 2 is used to collect and transmit electrical signals. The telescopic mechanism 3 is used to provide elastic pressure during the pressing process to ensure stable contact between the pressure strip and the battery cell. The N-zone pressure strip 401 and the P-zone pressure strip 501 respectively contact the fine grids of the N-zone and P-zone on the back of the battery to achieve current acquisition. The entire row of test units is composed of N-zone and P-zone test strips 5 arranged in a cross pattern to complete electrode contact from the back. During the test, the front of the battery is unobstructed to ensure uniform illumination. EL or PL imaging has no shadows and can clearly detect defects such as microcracks and short circuits. The electrical signal is transmitted through the pressure strip to the busbar probe structure 2 via the telescopic mechanism 3 and then output to the external acquisition device to complete the test.

[0028] It should be noted that the N-zone pressure bar 401 and the P-zone pressure bar 501 each have 200 contacts. The contacts are raised structures with a width of 0.5 mm, a length of 5 mm, a height of 0.5 mm, and a spacing of 0.8 mm between adjacent contacts. The main body structure 1, the busbar probe structure 2, the telescopic mechanism 3, and the surfaces of the N-zone pressure bar 401 and the P-zone pressure bar 501 are all plated with gold. The raised contacts on the N-zone pressure bar 401 and the P-zone pressure bar 501 form good electrical contact with the fine grid on the back of the battery. The contacts are evenly distributed to ensure comprehensive and reliable current acquisition. The gold plating reduces contact resistance, prevents oxidation, and improves conductivity and durability. The coordinated work of all components ensures stable transmission of electrical signals and improves test repeatability and accuracy.

[0029] Please see Figures 1-5 In this embodiment, to achieve precise matching of the N-zone and P-zone pressure strips 501 with the battery's back electrode, ensuring reliable contact and facilitating unobstructed testing for more accurate electrical performance parameter measurements and more realistic data, the telescopic mechanism 3 in this embodiment includes a pressure rod 301 mounted on the main structure 1 of the test strip. The telescopic mechanism 3 has a cylindrical hole through which the pressure rod 301 passes and cooperates with the telescopic mechanism 3. When pressed down, pressure is applied to the N-zone pressure strip 401 and the P-zone pressure strip 501. The number of contact points on the N-zone pressure strip 401 is consistent with the number of fine grids in the N-zone on the back of the BC 0BB battery, and the number of contact points on the P-zone pressure strip 501 is consistent with the number of fine grids in the P-zone. The contact point distribution positions correspond to the fine grid positions. The entire row of test units captures images of the battery cell edges through a four-camera system and compares them with pre-stored N-zone / P-zone distribution graphics to adjust the alignment positions of the N-zone pressure strip 401 and the P-zone pressure strip 501 with the battery cell.

[0030] It should be added that the four-camera system includes four industrial cameras set around the battery cell to acquire images of the battery cell's edge contour. The image processing module matches the acquired images with a preset N / P area distribution template to generate a position deviation signal, which drives the alignment mechanism to adjust the horizontal, vertical, and angular positions of the entire row of test units to achieve precise alignment.

[0031] The telescopic mechanism 3 can be made of spring, elastic silicone column or micro airbag structure, with compression rebound characteristics, which can provide uniform pressure when pressing down and automatically compensate for height difference when poor contact occurs.

[0032] In this embodiment, the pressure rod 301 cooperates with the telescopic mechanism 3 to achieve a downward pressing action, providing stable and controllable contact pressure to ensure that the N-zone pressure strip 401 and the P-zone pressure strip 501 are fully in contact with the back of the battery cell, avoiding poor contact that could lead to increased resistance or signal distortion. The number of contacts on the N-zone pressure strip 401 and the P-zone pressure strip 501 corresponds one-to-one with the fine grids in the N and P zones on the back of the battery, and their distribution positions are precisely matched to ensure that each electrode area is effectively captured. Four cameras capture images of the battery edge and compare them with pre-stored images to achieve high-precision positioning. The relative position of the test strip and the battery is adjusted, and the entire row of test units is pressed together after accurate alignment. Combined with an unshaded environment, this makes the measurement of electrical performance parameters more accurate and reliable.

[0033] It should be noted that the entire row of test units is set on the back of the solar cell. When there is no obstruction on the front of the solar cell during the test, the EL or PL imaging device will acquire images from the front.

[0034] The working principle of the above embodiments is as follows:

[0035] During use, the battery cell is transported to the test position. Four cameras capture images of the battery edge and compare them with pre-stored images. The alignment of the entire row of test units is adjusted to ensure that the N-zone pressure bar 401 and P-zone pressure bar 501 are precisely aligned with the fine grids of the N and P zones on the back. The pressure bar 301 drives the telescopic mechanism 3 to press down, so that the contacts on the N-zone pressure bar 401 and P-zone pressure bar 501 are in full contact with the back of the battery cell. The contacts and the fine grids are connected one by one to form an electrical connection. The electrical signal is transmitted through the N-zone pressure bar 401 and P-zone pressure bar 501 to the busbar probe structure 2, and then output to the external acquisition device to complete the measurement of parameters such as open circuit voltage and short circuit current. At the same time, the front is unobstructed, and the EL or PL imaging equipment acquires images from the front. The lighting is uniform and there are no shadows, which can clearly detect defects such as hidden cracks and short circuits. After the test, the pressure bar 301 retracts, the entire row of test units is lifted, and the battery cell is removed to complete the test process.

[0036] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A BC 0BB battery cell testing device, comprising a row of testing units and a main structure of testing strips (1), wherein the row of testing units is composed of 20 N-region testing strips (4) and 20 P-region testing strips (5) arranged in a cross pattern, characterized in that: Each N-zone test strip (4) includes the test strip main body structure (1), the busbar probe structure (2), the telescopic mechanism (3) and the N-zone pressure strip (401), and each P-zone test strip (5) includes the test strip main body structure (1), the busbar probe structure (2), the telescopic mechanism (3) and the P-zone pressure strip (501). The busbar probe structure (2) is set on the main structure (1) of the test strip, the telescopic mechanism (3) is set on the busbar probe structure (2), the N-zone pressure strip (401) is set below the telescopic mechanism (3) and is used to contact the N-zone fine grid on the back of the BC 0BB battery, and the P-zone pressure strip (501) is set below the telescopic mechanism (3) and is used to contact the P-zone fine grid on the back of the BC 0BB battery; When the entire row of test units is pressed down, the N-zone pressure bar (401) and the P-zone pressure bar (501) contact the surface of the battery cell through the telescopic mechanism (3). The electrical signal is transmitted to the busbar probe structure (2) through the N-zone pressure bar (401) or the P-zone pressure bar (501) and output to the external acquisition system.

2. The BC 0BB cell testing device according to claim 1, characterized in that: The N-zone pressure strip (401) and the P-zone pressure strip (501) are each provided with 200 contact points. The contact points are raised structures with a width of 0.5 mm, a length of 5 mm, a raised height of 0.5 mm, and a spacing of 0.8 mm between adjacent contact points.

3. The BC 0BB cell testing device according to claim 1, characterized in that: The surfaces of the test strip main structure (1), the busbar probe structure (2), the telescopic mechanism (3), the N-zone pressure strip (401), and the P-zone pressure strip (501) are all plated with gold.

4. The BC 0BB cell testing device according to claim 1, characterized in that: The telescopic mechanism (3) includes a pressure rod (301) installed on the main structure (1) of the test strip. The telescopic mechanism (3) has a cylindrical hole. The pressure rod (301) passes through the cylindrical hole and cooperates with the telescopic mechanism (3). When pressed down, it applies pressure to the N-zone pressure strip (401) and the P-zone pressure strip (501).

5. The BC 0BB cell testing device according to claim 1, characterized in that: The number of contacts on the N-zone pressure strip (401) is the same as the number of fine grids in the N-zone on the back of the BC 0BB battery, and the number of contacts on the P-zone pressure strip (501) is the same as the number of fine grids in the P-zone. The position of the contacts corresponds to the position of the fine grids.

6. The BC 0BB cell testing device according to claim 1, characterized in that: The entire test unit captures images of the battery cell edges using a four-camera system and compares them with pre-stored N / P area distribution patterns to adjust the alignment of the N-area pressure strip (401) and the P-area pressure strip (501) with the battery cell.

7. The BC 0BB battery cell testing device according to claim 1, characterized in that: The entire row of test units is located on the back of the solar cell. When there is no obstruction on the front of the solar cell during the test, the EL or PL imaging device acquires images from the front.

Images