A battery cell sheet detection probe, test tool and battery cell sheet detection method

Abstract

This invention discloses a BC solar cell testing probe, testing fixture, and solar cell testing method. It includes a PCB probe board with a PCB-like structure. The PCB probe board has a testing surface and a back surface on its two sides. Multiple sets of pin-type probes are arranged in rows on the testing surface. Two sets of terminals are provided on both sides of the back surface, and multiple sets of fixing nuts are also distributed on the back surface. This invention, by setting a PCB-like probe structure, differs from traditional probe structures where the pins are separated into positive and negative terminals on opposite sides of the device. It innovatively concentrates the probe rows on the same side of the PCB board, allowing the probe structure to make sufficient and appropriate contact with the electrodes of the BC solar cell during testing, thus meeting the requirements of BC solar cell testing.

Description

Technical Field

[0001] This invention relates to the field of solar cell testing technology, and in particular to a BC solar cell testing probe, testing fixture, and solar cell testing method. Background Technology

[0002] Solar cells are the core components of the solar photovoltaic industry. They are the basic units that convert solar energy into electrical energy. They are thin sheets made of semiconductor materials (mainly silicon) and can directly convert sunlight into direct current through the "photovoltaic effect".

[0003] In the process of solar cell production, in order to ensure the qualified efficiency of solar cells, people use solar cell testing systems (composed of detection probes and testing fixtures) to test the electrical performance of solar cells. For example, patent application number 202310811413.7 discloses a probe structure, solar cell testing device and solar cell sorting method. This patent uses two sets of probe modules, one for the front and one for the back, to test the solar cells. However, the probe detection structure of this patent has significant limitations. In actual operation, it can only test solar cells with electrodes on both the top and bottom sides. When it comes to BC solar cells with electrodes on only one side, it cannot meet the requirements for testing their electrical performance. Meanwhile, existing testing fixtures that work with probes suffer from insufficient flexibility. These fixtures typically only perform contact testing on solar cells that have been moved to the testing area and whose electrode testing points precisely align with the probes, through a simple pressing action. However, in actual production, when solar cells are moved to the testing area by conveying or handling equipment, it is difficult to ensure they are always placed in the correct orientation. Furthermore, existing testing fixtures lack guiding and alignment functions, directly leading to solar cells contacting the probes in the wrong orientation and being tested. This ultimately results in distorted test data and fails to effectively guarantee the accuracy of the test results. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention proposes a BC cell detection probe, testing fixture and cell detection method to solve such problems.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a BC battery cell detection probe, including a PCB probe board with a PCB board structure, wherein a detection surface and a back surface are respectively provided on both sides of the PCB probe board, and multiple sets of pin-type probe rows are distributed in rows on the detection surface, and two sets of terminals are provided on both sides of the back surface, while multiple sets of fixing nuts are distributed on the back surface. The probe array has a pin-type structure that matches the electrode grid lines of the BC solar cell, and the polarity of each pair of adjacent pin-type probe arrays is opposite. At the same time, the probe array and the fixing nut are connected in circuit.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a BC battery cell testing fixture, including a detection unit, a pressing unit, a base and a driving module. The detection unit consists of multiple sets, which are regularly distributed on the base. Each set of detection units is topped with a pressing unit, and the pressing units are connected to the driving module. The detection unit includes a detection platform mounted on a base, a fixed shaft connected to the center of the detection platform, a linkage component sleeved on the fixed shaft, four sets of adjustment components connected in a cross structure to the four sides of the linkage component, and a transmission component sleeved on the linkage component. The pressing unit includes a fixed frame fixedly connected to the drive module, two sets of drive shafts rotatably connected to the fixed frame, a gear fixedly connected to the outer end of one of the drive shafts, and multiple pressing modules connected below each set of drive shafts.

[0007] As a preferred embodiment of the BC cell testing fixture of the present invention, the testing platform has an upward-opening testing area, and a PCB probe board is installed in the testing area. Limiting grooves are opened on the four sides of the testing platform, and the outer end of the adjusting component extends upward into the limiting groove. A rack is provided on the side of one set of limiting grooves, and the rack and gear are aligned and matched.

[0008] As a preferred embodiment of the BC cell testing fixture of the present invention, a spring is provided on the fixed shaft, and the spring is sleeved on the lower outer side of the linkage component, while the top end of the spring abuts against the fixed shaft and the transmission component respectively.

[0009] As a preferred embodiment of the BC cell testing fixture of the present invention, the linkage component includes a drive disk sleeved on a fixed shaft, multiple sets of drive grooves evenly distributed on the drive disk, each set of drive grooves being an arc-shaped structure with its inner end inclined toward the center of the drive disk, a drive groove disposed at the lower end of the drive disk and rotatably connected to the fixed shaft, and two sets of spiral grooves with a spiral structure evenly coiled on the outer wall of the sleeve.

[0010] As a preferred embodiment of the BC battery cell testing fixture of the present invention, the adjusting component includes a horizontal plate disposed at the bottom of the testing platform, a slot opened horizontally on the outer end of the horizontal plate, a fixing frame inserted into the slot, and the outer ends of the fixing frame being fixedly connected upwards on both sides to the testing platform, a vertical plate disposed vertically on the outer end of the horizontal plate and extending upwards into the limiting groove, a sliding plate slidably inserted into the inner side of the vertical plate, an elastic rod disposed vertically between the lower end of the sliding plate and the outer end of the horizontal plate, and an insert shaft disposed vertically on the inner end of the horizontal plate, the insert shaft extending into the drive disk.

[0011] As a preferred embodiment of the BC cell testing fixture of the present invention, the conductive component includes a collar sleeved on a sleeve, two sets of guide shafts symmetrically arranged inside the collar, with the inner ends of the guide shafts extending into a spiral groove, two sets of trusses arranged on both sides of the collar, and vertical shafts arranged vertically at both ends of each set of trusses, with the top end of the vertical shaft extending upward through a testing platform.

[0012] As a preferred embodiment of the BC battery cell testing fixture of the present invention, the fixture has extension plates on both sides corresponding to the vertical axis, and multiple sets of sliding grooves for limiting the position are provided below the fixture. The pressing module includes a vertically arranged rotating shaft, multiple sets of flexible rollers are sleeved on the rotating shaft, and sliders are arranged between the rollers, and the sliders are limited and slidably connected in the sliding grooves.

[0013] As a preferred embodiment of the BC battery cell testing fixture of the present invention, the drive shaft is rotatably connected in the fixed frame, and the two sets of drive shafts are symmetrical to each other and fixedly connected to each other. Each set of drive shafts is equally provided with three sets of spiral guide grooves, and the three sets of guide grooves have the same number of spiral turns. The length ratio of the three sets of guide grooves is 1:2:3. The slider on the pressing module extends into the guide groove.

[0014] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a BC solar cell testing method, comprising a testing probe and a testing fixture, and a testing camera, and further comprising the following steps: S1. The image acquisition range of the detection camera must completely cover the contact area between the pole of the BC electrode and the PCB probe board. Before the test, the Mark points printed on the back of the BC cell are accurately located by the image recognition system, and a coordinate system is established to calibrate the spatial position of the camera and the cell. S2. The BC solar cells to be tested are accurately transferred to the testing platform through an automated conveying device. The positioning camera captures the coordinates of the Mark points of the BC solar cells in real time, compares them with the preset standard positions, and calculates the offset in the X / Y axis directions. S3. The drive module drives the pressing unit to move downward along the Z-axis and approach the detection unit. During the downward movement, it triggers four sets of cross-shaped adjustment components. The four sets of adjustment components adjust the two-dimensional orientation of the BC cell in both the horizontal and vertical directions to ensure the initial alignment of the electrode grid lines and the probe array. S4. After the plane position of the BC battery cell is calibrated, the pressing unit continues to move downward. Through the cooperation of the drive shaft and the pressing module, the BC battery cell is finely adjusted in the Z-axis direction to compensate for the contact gap caused by the thickness deviation. S5. Finally, the BC battery cell is pressed down evenly by multiple sets of independent suspended pressing modules, so that the back electrode of the BC battery cell forms a stable contact with the PCB probe board. The probe row establishes an electrical connection with the electrode point of the BC battery cell through elastic contacts. The test system simultaneously collects key electrical performance parameters such as open circuit voltage and short circuit current. S6. At the instant the probe array contacts the BC cell electrode, the detection camera simultaneously acquires images of the contact area at a sampling rate of 1000fps. The image algorithm analyzes the alignment accuracy of the probe and the grid line, the contact pressure distribution, and whether there is any loose connection. A contact quality assessment report is generated as the basis for subsequent yield analysis.

[0015] The beneficial effects of this invention are as follows: By setting a PCB board-shaped probe structure, which is different from the traditional probe structure in which the positive and negative pins are separated on both sides of the device, the probe array is innovatively concentrated on the same side of the PCB board. This allows the probe structure of this invention to match and fully contact the electrodes of the BC cell when testing the BC cell, thereby meeting the requirements of BC cell testing. The BC solar cell is tested using a test fixture composed of a detection unit and a pressing unit. During the pressing and bonding process, the detection unit and the pressing unit will respectively adjust the alignment of the BC solar cell and perform multi-point pressing operations. The detection unit can adjust the position of the BC solar cell from both the horizontal and vertical sides when the fixture is pressed downward, thereby adjusting the two-dimensional orientation of the BC solar cell. This ensures that the electrode grid lines and probe array are initially aligned, allowing the BC solar cell to contact the probes in the correct state. This ensures the normal operation of the detection work, effectively avoids misalignment between the BC solar cell probes, and thus strongly guarantees the accuracy of the test results. Meanwhile, the pressing unit is equipped with multiple pressing modules, which allow the pressing unit to unfold its multiple pressing modules equally to both sides when pressing down. The equally unfolded pressing modules increase the number of contact points with the BC solar cell, thereby making the contact between the BC solar cell and the probe more intimate, effectively ensuring the accuracy of the test. At the same time, during the unfolding process, the pressing modules can also press down and flatten the raised BC solar cell, further ensuring the contact effect between the BC solar cell and the probe, and ensuring the accuracy of the test data. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the front and side structure of the detection probe in this invention.

[0017] Figure 2 This is a schematic diagram of the back side structure of the detection probe in this invention.

[0018] Figure 3 This is a schematic diagram of the test fixture in this invention.

[0019] Figure 4 This is a schematic diagram of the pressing state of the detection unit and pressing unit of the testing fixture in this invention.

[0020] Figure 5 This is a schematic diagram of the upper structure of the detection unit of the testing fixture in this invention.

[0021] Figure 6 This is a schematic diagram of the bottom structure of the detection unit of the testing fixture in this invention.

[0022] Figure 7 This is a schematic diagram of the linkage and adjustment components of the test fixture in this invention.

[0023] Figure 8 This is a top-view schematic diagram of the linkage and adjustment components of the test fixture in this invention.

[0024] Figure 9 This is a schematic diagram of the linkage and transmission components of the test fixture in this invention.

[0025] Figure 10 This is a schematic diagram of the pressing unit of the test fixture in this invention.

[0026] Figure 11This is a comparison diagram of the two states of the test fixture's drive shaft driving the pressing module to contract and expand in this invention.

[0027] Reference numerals: 1. Detection unit; 11. Detection platform; 111. Detection area; 112. Limiting groove; 113. Rack; 12. Fixed shaft; 121. Spring; 13. Linkage component; 131. Drive disc; 132. Drive groove; 133. Sleeve; 134. Spiral groove; 14. Adjustment component; 141. Horizontal plate; 142. Slot; 143. Fixing frame; 144. Vertical plate; 145. Slide plate; 146. Elastic rod; 147. Insert 15. Shaft; 151. Conducting component; 152. Collar; 153. Guide shaft; 154. Truss; 155. Vertical shaft; 2. Pressing unit; 21. Fixing frame; 211. Extension plate; 212. Slide groove; 22. Drive shaft; 221. Guide groove; 23. Gear; 24. Pressing module; 3. PCB probe board; 31. Detection surface; 32. Back side; 33. Probe row; 34. Terminal; 35. Fixing nut; 4. Base; 5. Drive module. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Reference Figures 1 to 2This is the first embodiment of the present invention, which includes a BC solar cell testing probe, comprising a PCB probe board 3 with a PCB board-like structure. The PCB probe board 3 has a detection surface 31 and a back surface 32 on its two sides. Multiple sets of pin-type probe rows 33 are arranged in rows on the detection surface 31. Two sets of terminals 34 are provided on both sides of the back surface 32, and multiple sets of fixing nuts 35 are distributed on the back surface 32. The terminals 34 are used to connect to external current and voltage lines, and the fixing nuts 35 are used for installation and fixation. The pin-type structure of the probe rows 33 matches the electrode grid lines of the BC solar cell, and each adjacent pair of pin-type structures... The probe arrays 33 have opposite polarities, and the circuits of the probe arrays 33 and the fixing nut 35 are connected. By concentrating the probe arrays 33 on the detection surface 31, the PCB probe board 3 can form a PCB-like structure. Unlike the traditional probe structure where the pins are separated into positive and negative poles on both sides of the device, the innovative method of concentrating the probe arrays 33 on the same side of the PCB board allows the probe structure of this invention to match and fully contact the electrodes of the BC cell when testing BC cells, thereby meeting the requirements of BC cell testing.

[0031] Reference Figures 3 to 11 As a second embodiment of the present invention, a BC battery cell testing fixture is provided, including a detection unit 1, a pressing unit 2, a base 4, and a drive module 5. There are multiple sets of detection units 1, which are regularly distributed on the base 4. Each set of detection units 1 is provided with a pressing unit 2 above it. The pressing units 2 are connected to the drive module 5. The drive module 5 is powered by an external power source, which can push the pressing unit 2 to move vertically, thereby realizing the pressing test and the rising and resetting operation. The specific number of detection units 1 can be added according to the testing requirements. Reference Figure 5 and Figure 6 The detection unit 1 includes a detection platform 11 mounted on a base 4, a fixed shaft 12 connected to the center of the detection platform 11, a linkage component 13 sleeved on the fixed shaft 12, four sets of adjustment components 14 connected in a cross structure to the four sides of the linkage component 13, and a transmission component 15 sleeved on the linkage component 13. The fixed shaft 12 is fixedly connected to the lower end of the detection platform 11, while the linkage component 13 is rotatably connected to the fixed shaft 12. The two sets of adjustment components 14 arranged horizontally are longer than the two sets of adjustment components 14 arranged vertically. The four sets of adjustment components 14 can realize the two-dimensional attitude adjustment of the BC battery cell in both horizontal and vertical directions. Reference Figure 10The pressing unit 2 includes a fixed frame 21 fixedly connected to the drive module 5, two sets of drive shafts 22 rotatably connected to the fixed frame 21, a gear 23 fixedly connected to the outer end of one of the drive shafts 22, and multiple sets of pressing modules 24 connected below each set of drive shafts 22. The two sets of drive shafts 22 are symmetrically distributed and coaxial and fixedly connected together. The pressing modules 24 are slidably connected to the fixed frame 21 in the horizontal direction.

[0032] Reference Figure 5 The testing platform 11 has an upward-facing testing area 111, and the PCB probe board 3 is installed in the testing area 111. Limiting grooves 112 are formed on the four sides of the testing platform 11, and the outer end of the adjusting component 14 extends upward into the limiting groove 112. A rack 113 is provided on the side of one set of limiting grooves 112, and the rack 113 corresponds to and matches the gear 23. The edge of the testing area 111 is open to facilitate the entry of BC battery cells into the testing area 111. The adjustment component 14 is used to make way for the adjustment component 14, so that the adjustment component 14 can move horizontally on all four sides of the detection platform 11. The rack 113 can mesh with the teeth of the gear 23. When the pressing unit 2 approaches the detection unit 1 in the vertical direction, the rack 113 stays still with the detection platform 11, while the gear 23 moves downward with the fixed frame 21. At this time, through the meshing of the rack 113 and the gear 23, the gear 23 will rotate around its own axis, thereby driving the drive shaft 22 to rotate in the same direction.

[0033] Reference Figure 7 A spring 121 is provided on the fixed shaft 12, and the spring 121 is sleeved on the outer side of the lower end of the linkage component 13. At the same time, the top end of the spring 121 abuts against the fixed shaft 12 and the transmission component 15 respectively. The fixed shaft 12 is used to install the linkage component 13. The spring 121 can always push the transmission component 15 upward through its own elastic support.

[0034] Reference Figure 7 The linkage component 13 includes a drive disk 131 sleeved on a fixed shaft 12, multiple sets of drive grooves 132 evenly distributed on the drive disk 131, and each set of drive grooves 132 is an arc-shaped structure with its inner end inclined towards the center of the drive disk 131, a drive groove 132 set at the lower end of the drive disk 131 and rotatably connected to the fixed shaft 12, and two sets of spiral grooves 134 that are spiral in structure and evenly coiled on the outer wall of the sleeve 133. The drive disk 131 can rotate circumferentially with the fixed shaft 12 as the axis. The rotating drive disk 131 will synchronously drive the drive grooves 132 to rotate. The object driven by the drive grooves 132 will move towards the center of the drive disk 131 through the outer extension of the drive disk 131, thereby causing a horizontal position change.

[0035] Reference Figure 7 and Figure 8 The adjusting component 14 includes a horizontal plate 141 disposed at the bottom of the detection platform 11, a slot 142 horizontally opened on the outer end of the horizontal plate 141, a fixing bracket 143 inserted into the slot 142, with the outer ends of the fixing bracket 143 fixedly connected upwards to the detection platform 11 on both sides, a vertical plate 144 vertically disposed at the outer end of the horizontal plate 141 and extending upwards into the limiting groove 112, a sliding plate 145 vertically slidably inserted into the inner side of the vertical plate 144, an elastic rod 146 vertically disposed between the lower end of the sliding plate 145 and the outer end of the horizontal plate 141, and a shaft 147 vertically disposed at the inner end of the horizontal plate 141. The insertion shaft 147 extends into the drive plate 131. The horizontal plate 141, through the cooperation of the slot 142 and the fixing frame 143, can slide horizontally on the bottom surface of the detection platform 11. The sliding horizontal plate 141 will also drive the vertical plate 144 and the slide plate 145 to move horizontally within the limiting groove 112. Since the insertion shaft 147 extends into the drive groove 132, when the drive groove 132 rotates, it will drive the horizontal plate 141 to move horizontally through the insertion shaft 147. The horizontally moving horizontal plate 141 will drive the vertical plate 144 and the slide plate 145 to push the BC battery cell located on the detection area 111.

[0036] Furthermore, refer to Figure 7 The vertical plate 144 and the sliding plate 145 are vertically slidably connected, so that the BC battery cells that are contacted from the sides are not obstructed when moving vertically. The elastic rod 146 located below the sliding plate 145 has weak elasticity and can push the sliding plate 145 to perform a reset operation when it is not subjected to downward pressure.

[0037] Reference Figure 9 The conductive component 15 includes a collar 151 sleeved on the sleeve 133, two sets of guide shafts 152 symmetrically arranged inside the collar 151, with the inner ends of the guide shafts 152 extending into the spiral groove 134, two sets of trusses 153 arranged on both sides of the collar 151, and vertical shafts 154 vertically arranged at both ends of each truss 153, with the top ends of the vertical shafts 154 passing through the detection platform 11 and extending upward. When the fixed frame 21 moves downward, the conductive component 15 receives the signal through the vertical shafts 154 extending upward at both ends. When the self-pressing unit 2 is squeezed, the vertical shaft 154 will drive the entire conductive component 15 to move downward. The downward moving conductive component 15 will be connected and cooperated with the spiral groove 134 through the guide shaft 152, so that the force of the entire conductive component 15 pressing down is transformed into the force of driving the linkage component 13 to rotate in a circle under the spiral guidance of the spiral groove 134. The rotating linkage component 13 will then drive the adjustment component 14 to perform the adjustment and alignment operation of the BC battery cell through the cooperation of the drive groove 132 and the insertion shaft 147.

[0038] During use, combined Figure 8 Driven by the drive module 5, the pressing unit 2 approaches the detection unit 1. At this time, the transmission component 15 is squeezed by the pressing unit 2 through the vertical shafts 154 extending upward at both ends, which in turn drives the entire transmission component 15 to move downward. The downward-moving transmission component 15 can only move in the vertical direction, which causes the guide shaft 152 to apply downward pressure to the spiral groove 134. At this time, the linkage component 13, under the spiral guidance of the spiral groove 134, transforms the downward pressure applied by the transmission component 15 into a force that drives the linkage component 13 to rotate in a circular motion. The linkage component 13 drives the adjustment component 14 to move horizontally through the cooperation of the drive groove 132 and the insertion shaft 147. The four sets of cross-shaped adjustment components 14 push and adjust the position of the BC battery cell from both the horizontal and vertical sides, respectively, to achieve the two-dimensional orientation adjustment of the BC battery cell, ensuring that the electrode grid lines and the probe array 33 are initially aligned, so that the BC battery cell contacts the probe in the correct state, thereby ensuring the normal progress of the detection work, effectively avoiding the phenomenon of misalignment between the BC battery cell and the probe, and thus strongly guaranteeing the accuracy of the test results.

[0039] Reference Figure 10 The fixing frame 21 has extension plates 211 on both sides corresponding to the vertical axis 154. The fixing frame 21 has multiple sets of sliding grooves 212 for limiting the position. The pressing module 24 includes a vertically arranged rotating shaft with multiple sets of flexible rollers sleeved on it. A slider is arranged between the rollers and the slider is limited and slidably connected in the sliding groove 212. The extension plates 211 can press the vertical axis 154 when the fixing frame 21 moves downward, thereby achieving the purpose of driving the transmission component 15. The pressing module 24 can slide horizontally below the fixing frame 21 through the cooperation of the slider and the sliding groove 212. The flexible rollers can avoid damaging the BC battery cells. At the same time, the rolling method changes the rigid direct contact between the two into a softer rolling contact, further ensuring the safety of the BC battery cells.

[0040] Reference Figure 11The drive shaft 22 is rotatably connected within the fixed frame 21, and the two sets of drive shafts 22 are symmetrical to each other and fixedly connected. Each set of drive shafts 22 is provided with three sets of spiral guide grooves 221, and the number of spiral turns of the three sets of guide grooves 221 is the same. The length ratio of the three sets of guide grooves 221 is 1:2:3. The slider on the pressing module 24 extends into the guide groove 221. The pressing module 24 can only move horizontally through the cooperation of the sliding groove 212 and the slider. The drive shaft 22 can rotate when the pressing unit 2 moves downward through the cooperation of the gear 23 and the rack 113. At this time, the rotating drive shaft 22 will push the corresponding pressing module 24 to move horizontally through its corresponding guide groove 221.

[0041] Furthermore, refer to Figure 11 The three components have different length ratios but the same number of spiral turns, so that when they rotate at the same amplitude, the distance between each pair of the corresponding pressing modules 24 is proportionally increased, thereby achieving the purpose of uniformly and proportionally distributing pressure points and avoiding pressure injuries caused by uneven pressure.

[0042] During use, combined Figure 4 and Figure 11 During the descent of the pressing unit 2, the gear 23 will engage with and rotate the rack 113. At this time, the gear 23 will synchronously drive the drive shaft 22 to move as a whole. The moving drive shaft 22, through the cooperation of the guide groove 221 and the slide groove 212, can push the multiple sets of pressing modules 24 set below to unfold outward in equal proportions. The equally unfolded pressing modules 24 have three technical effects: First, they can increase the contact points between the BC battery cell and the BC battery cell, so that the downward pressure can be applied evenly and dispersedly to the BC battery cell, ensuring safety during the downward pressure overshoot. Second, the multiple pressing points can make the contact between the BC battery cell and the PCB probe board 3 closer, thereby effectively ensuring the accuracy of the testing work. Third, during the unfolding process, the pressing modules 24 can press the raised BC battery cell downward flat, realizing the function of adjusting the position of the BC battery cell in the Z-axis direction, thereby further ensuring the contact effect between the BC battery cell and the probe, and ensuring the accuracy of the test data.

[0043] As a third embodiment of the present invention, this embodiment proposes a BC solar cell testing method, including a testing probe and a testing fixture, as well as a testing camera, and further includes the following steps: S1. The image acquisition range of the detection camera must completely cover the contact area between the pole of the BC electrode and the PCB probe board 3. Before the test, the Mark points printed on the back of the BC cell are accurately located by the image recognition system, and a coordinate system is established to achieve spatial position calibration between the camera and the cell. S2. The BC solar cells to be tested are accurately transferred to the testing platform 11 by an automated conveying device. The positioning camera captures the coordinates of the Mark point of the BC solar cells in real time, compares them with the preset standard position, and calculates the offset in the X / Y axis direction. S3, the drive module 5 drives the pressing unit 2 to move downward along the Z-axis and approach the detection unit 1. During the downward movement, it triggers four sets of cross-shaped adjustment components 14. The four sets of adjustment components 14 adjust the two-dimensional orientation of the BC cell in both the horizontal and vertical directions to ensure that the electrode grid lines and the probe array 33 are initially aligned. S4. After the plane position of the BC battery cell is calibrated, the pressing unit 2 continues to move downward. Through the cooperation of the drive shaft 22 and the pressing module 24, the BC battery cell is finely adjusted in the Z-axis direction to compensate for the contact gap caused by the thickness deviation. S5. Finally, the BC battery cell is pressed down evenly by multiple sets of independently suspended pressing modules 24, so that the back electrode of the BC battery cell and the PCB probe board 3 form a stable contact. The probe row 33 establishes an electrical connection with the electrode point of the BC battery cell through elastic contacts. The test system simultaneously collects key electrical performance parameters such as open circuit voltage and short circuit current. S6. At the instant the probe array 33 contacts the BC cell electrode, the detection camera simultaneously acquires images of the contact area at a sampling rate of 1000fps. The image algorithm analyzes the alignment accuracy of the probe and the grid line, the contact pressure distribution, and whether there is any loose connection. A contact quality assessment report is generated as the basis for subsequent yield analysis.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A BC solar cell detection probe, comprising a PCB probe board (3) with a PCB board-like structure, characterized in that: The PCB probe board (3) has a detection surface (31) and a back surface (32) on its two sides respectively. Multiple sets of probe rows (33) with pin-type structures are arranged in rows on the detection surface (31). Two sets of terminals (34) are arranged on both sides of the back surface (32). At the same time, multiple sets of fixing nuts (35) are distributed on the back surface (32). The probe array (33) has a pin-type structure that matches the electrode grid lines of the BC battery cell, and the polarity of each pair of adjacent probe arrays (33) is opposite. At the same time, the probe array (33) and the fixing nut (35) are connected in circuit.

2. A BC solar cell testing fixture, comprising a testing unit (1), a pressing unit (2), a base (4), and a driving module (5), characterized in that: The detection unit (1) has multiple sets, and the multiple sets of detection units (1) are regularly distributed on the detection unit (1) on the base (4). At the same time, a set of pressing unit (2) is provided above each set of detection unit (1), and the driving module (5) is connected to the top of the multiple sets of pressing unit (2). The detection unit (1) includes a detection platform (11) set on the base (4), a fixed shaft (12) connected to the center position below the detection platform (11), a linkage component (13) sleeved on the fixed shaft (12), four sets of adjustment components (14) connected in a cross structure on the four sides of the linkage component (13), and a transmission component (15) sleeved on the linkage component (13). The pressing unit (2) includes a fixed frame (21) fixedly connected to the drive module (5), two sets of drive shafts (22) rotatably connected to the fixed frame (21), a gear (23) fixedly connected to the outer end of one of the drive shafts (22), and multiple sets of pressing modules (24) connected below each set of drive shafts (22).

3. The BC cell testing fixture according to claim 2, characterized in that: The detection platform (11) has an upward-facing detection area (111), and the PCB probe board (3) is installed in the detection area (111). Limiting grooves (112) are opened on the four sides of the detection platform (11), and the outer end of the adjustment component (14) extends upward into the limiting groove (112). A rack (113) is set on the side of one of the limiting grooves (112), and the rack (113) and the gear (23) are aligned and matched.

4. The BC cell testing fixture according to claim 2, characterized in that: A spring (121) is provided on the fixed shaft (12), and the spring (121) is sleeved on the lower outer side of the linkage component (13). At the same time, the top of the spring (121) abuts against the fixed shaft (12) and the transmission component (15) respectively.

5. The BC cell testing fixture according to claim 2, characterized in that: The linkage component (13) includes a drive disk (131) sleeved on a fixed shaft (12), multiple sets of drive grooves (132) evenly distributed on the drive disk (131), and each set of drive grooves (132) is an arc-shaped structure with its inner end inclined toward the center of the drive disk (131), a drive groove (132) set at the lower end of the drive disk (131) and the drive groove (132) rotatably connected to the fixed shaft (12), and two sets of spiral grooves (134) that are spiral in structure and evenly coiled around the outer wall of the sleeve (133).

6. The BC cell testing fixture according to claim 2 or 5, characterized in that: The adjustment component (14) includes a horizontal plate (141) disposed at the bottom of the detection platform (11), a slot (142) horizontally opened on the outer end of the horizontal plate (141), a fixing bracket (143) inserted into the slot (142), and the outer ends of the fixing bracket (143) being fixedly connected upwards on both sides of the detection platform (11), a vertical plate (144) vertically disposed at the outer end of the horizontal plate (141) and extending upwards into the limiting groove (112), a sliding plate (145) vertically slidably inserted into the inner side of the vertical plate (144), an elastic rod (146) vertically disposed between the lower end of the sliding plate (145) and the outer end of the horizontal plate (141), and a shaft (147) vertically disposed at the inner end of the horizontal plate (141), and the shaft (147) extending into the drive disk (131).

7. The BC cell testing fixture according to claim 2 or 5, characterized in that: The transmission component (15) includes a collar (151) sleeved on the sleeve (133), two sets of guide shafts (152) symmetrically arranged inside the collar (151), with the inner end of the guide shaft (152) extending into the spiral groove (134), two sets of trusses (153) arranged on both sides of the collar (151), and vertical shafts (154) vertically arranged at both ends of each set of trusses (153), with the top end of the vertical shaft (154) extending upward through the detection platform (11).

8. The BC cell testing fixture according to claim 7, characterized in that: The fixed frame (21) has extension plates (211) on both sides corresponding to the vertical axis (154). The fixed frame (21) has multiple sets of sliding grooves (212) for limiting the position. The pressing module (24) includes a vertically arranged rotating shaft, with multiple sets of flexible rollers sleeved on the rotating shaft. A slider is provided between the rollers, and the slider is limited and slidably connected in the sliding groove (212).

9. The BC cell testing fixture according to claim 2, characterized in that: The drive shaft (22) is rotatably connected in the fixed frame (21), and the two sets of drive shafts (22) are symmetrical to each other. At the same time, the two sets of drive shafts (22) are fixedly connected. Each set of drive shafts (22) is equally provided with three sets of spiral structure guide grooves (221), and the number of spiral turns of the three sets of guide grooves (221) is the same. At the same time, the length ratio of the three sets of guide grooves (221) is 1:2:

3. Meanwhile, the slider on the pressing module (24) extends into the guide groove (221).

10. A method for testing BC solar cells, comprising a testing probe as described in claim 1, a testing fixture as described in any one of claims 2-9, and a testing camera, characterized in that, It also includes the following steps: S1. The image acquisition range of the detection camera must completely cover the contact area between the pole of the BC electrode sheet and the PCB probe board (3). Before the test, the Mark point printed on the back of the BC battery sheet is accurately located by the image recognition system, and a coordinate system is established to realize the spatial position calibration of the camera and the battery sheet. S2. The BC solar cell to be tested is accurately transferred to the testing platform (11) by an automated conveying device. The positioning camera captures the coordinates of the Mark point of the BC solar cell in real time, compares them with the preset standard position, and calculates the offset in the X / Y axis direction. S3, the drive module (5) drives the pressing unit (2) to move downward along the Z-axis and approach the detection unit (1). During the downward movement, it triggers four sets of cross-shaped adjustment components (14). The four sets of adjustment components (14) adjust the two-dimensional orientation of the BC cell in the horizontal and vertical directions to ensure that the electrode grid lines and the probe array (33) are initially aligned. S4. After the plane position of the BC battery cell is calibrated, the pressing unit (2) continues to move downward. Through the cooperation of the drive shaft (22) and the pressing module (24), the BC battery cell is finely adjusted in the Z-axis direction to compensate for the contact gap caused by the thickness deviation. S5. Finally, the BC battery cell is pressed down evenly by multiple sets of independently suspended pressing modules (24) so ​​that the back electrode of the BC battery cell and the PCB probe board (3) form a stable contact. The probe row (33) establishes an electrical connection with the electrode point of the BC battery cell through elastic contacts. The test system simultaneously collects key electrical performance parameters such as open circuit voltage and short circuit current. S6. At the instant the probe array (33) contacts the BC cell electrode, the detection camera synchronously acquires the contact area image at a sampling rate of 1000fps. The image algorithm analyzes the alignment accuracy of the probe and the grid line, the contact pressure distribution, and whether there is a false connection. A contact quality assessment report is generated as the basis for subsequent yield analysis.

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