Back contact solar cell IV testing device

Abstract

The utility model discloses a back contact solar cell IV test device, which comprises a transmission mechanism, a liftable test platform, an IV test light source and a back contact solar cell, the liftable test platform is driven by a first lifting mechanism arranged below the liftable test platform, a negative pressure chamber is arranged in the liftable test platform, and the IV test light source is arranged in the negative pressure chamber. A test probe device is mounted in the liftable test platform and comprises a probe, a test frame and a second lifting mechanism, the probe is fixed on the test frame and extends out of the surface of the liftable test platform, and the surface of the liftable test platform is provided with a rubber sealing ring and an air suction hole. The rubber sealing ring is embedded in the table top of the liftable test platform and surrounds all the probes and the air suction holes, and the liftable test platform is further provided with a battery piece limiting device. The device is stable in testing, high in accuracy and suitable for large-scale assembly line type production, the production cost is greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, and in particular to a back-contact solar cell IV testing device. Background Technology

[0002] The existing automated testing solutions on the market are mainly for traditional bifacial solar cells with electrodes, which are tested by bifacial pressure probes or wires. Back-contact solar cells, on the other hand, are a new type of cell structure in which both the emitter electrode and the base electrode are located on the back of the cell.

[0003] For example, Chinese utility model patent CN 214756249U discloses an IBC solar cell electrode IV testing device, including an upper light source, a test backplate, a positive electrode probe group and a negative electrode probe group mounted on the test backplate. The upper light source is located above the test backplate, and the IBC solar cell is placed on the test backplate. The test backplate has multiple vacuum suction holes. The vacuum suction holes are connected to a vacuum pump, thereby using negative pressure to adsorb the IBC solar cell onto the test backplate, preventing the IBC solar cell from sliding and improving the accuracy of the test. The above solution has several problems: ① It lacks a limiting device. Although vacuum adsorption can ensure that the solar cell does not move, the test probes are below. Without limiting the position of the solar cell and the probes, the accuracy of the test will be affected; ② Without limiting devices, this solution is not suitable for mass production line production and is only suitable for manual testing in the laboratory.

[0004] For example, Chinese utility model patent CN 216873163U discloses an IBC solar cell IV testing device. This patent further improves upon the aforementioned patent, solving the problems of inconvenient observation and maintenance of the testing device, and inaccurate testing due to poor contact between the IBC cell and the probe. However, this solution still has the following shortcomings: ① Although the probe array is made adjustable and the electrode surface of the cell faces upward for easy observation, this solution is still only suitable for manual testing in the laboratory and is not suitable for mass production line production; ② The modified solution allows the cell to be attached to a suspended support, which poses a risk of the cell falling, thus creating a serious production hazard. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a back-contact solar cell IV testing device, which solves the problems that existing testing devices are not suitable for production lines, and that the existing production line solution of using glass and probes to press the front of the cell causes scratches.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a back-contact solar cell IV testing device, including a conveying mechanism, a liftable testing platform, an IV testing lamp source, and a back-contact solar cell. The liftable testing platform is located below the conveying mechanism, which is a multi-strand conveyor belt. The platform surface has two grooves corresponding to avoid the conveyor belt. The IV testing lamp source is correspondingly arranged with the liftable testing platform. The liftable testing platform is driven by a first lifting mechanism installed below it. The interior of the liftable testing platform is a negative pressure chamber. A test probe device is installed inside the liftable testing platform. The test probe device includes a probe, a test frame, and a second lifting mechanism. The probe is fixed on the test frame and extends out of the liftable testing platform surface. The second lifting mechanism drives the probe to rise and fall through the test frame. The liftable testing platform surface is provided with a rubber sealing ring and an air intake hole. The rubber sealing ring is embedded in the liftable testing platform surface and surrounds all the probes and air intake holes. The rubber sealing ring is arranged corresponding to the back-contact solar cell. The liftable testing platform is also provided with a cell limiting device.

[0007] Furthermore, the back contact solar cell has no electrode grid lines on the front side and contains 10 main grids on the back side. Each main grid includes a positive electrode and a negative electrode. The two main grid lines are connected by a fine grid. The fine grid connection area between two adjacent main grids is an area that the probe will not touch.

[0008] Furthermore, the back-contact solar cell has no electrode grid lines on the front and no main grid on the back, only fine grids. Ten sets of virtual main grid positions are set, which are designated as positive electrode region, negative electrode region and fine grid connection region. The fine grid connection region is the area that the probe will not contact.

[0009] Furthermore, the sinkhole on the liftable test platform is positioned in the middle area of ​​the fine grid connection region.

[0010] Furthermore, the rubber sealing rings are respectively set in the three areas of the liftable test platform surface divided by the sink groove to ensure the adsorption effect of the air inlet. The rubber sealing rings are 2mm higher than the platform surface.

[0011] Furthermore, the battery cell limiting device consists of two sets of limiting blocks installed on adjacent sides of the liftable test platform and two sets of movable blocks installed on the other two sides of the liftable test platform, driven by an automated mechanism.

[0012] Furthermore, the limiting block is adjustablely fixed to the platform surface of the liftable test platform by bolts.

[0013] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages:

[0014] 1. This utility model uses a conveyor belt to complete the feeding and transportation of the cells. During the testing process, it does not need to contact the front of the cells, thus avoiding the risk of scratches caused by the back of the cells contacting the front, which would lead to a decrease in battery efficiency. It is suitable for mass production line production, which greatly reduces production costs and improves production efficiency.

[0015] 2. By using a rubber sealing ring to create a sealed vacuum chamber, and by using a lifting mechanism to allow the test probe to avoid the problem of the probe hitting the back contact cell and failing to create a vacuum chamber, the optimal platform adsorption effect is achieved. Then, the test probe is raised to contact the electrode of the back contact cell, forming the best ohmic contact, thus solving the problems of poor test contact and low accuracy. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the liftable testing platform of this utility model;

[0019] Figure 3 This is a schematic diagram of the height-adjustable test platform structure of this utility model;

[0020] Figure 4 This is a schematic diagram illustrating the lifting relationship between the liftable testing platform, the conveyor belt, and the battery cells in an embodiment of this utility model.

[0021] Figure 5 This is a schematic diagram of the back contact solar cell electrode structure of Embodiment 1 of this utility model;

[0022] Figure 6 This is a schematic diagram of the back contact solar cell electrode structure of Embodiment 2 of this utility model;

[0023] Figure 7 This is a schematic diagram of the virtual structure of the back contact solar cell electrode in Embodiment 2 of this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] Example 1

[0026] refer to Figures 1-5 A back-contact solar cell IV testing device includes a conveying mechanism 100, a liftable testing platform 200, an IV testing lamp source 300, and a back-contact solar cell 400. The back-contact solar cell 400 has no electrode grid lines on its front side and contains 10 sets of main grids on its back side. Each set of main grids includes a positive electrode 410 and a negative electrode 420. The main grid lines are connected by fine grids. The fine grid connection area 430 between adjacent sets of main grids is an area that a probe 261 will not contact. The liftable testing platform 200 is positioned below the conveying mechanism 100, which is a multi-strand conveyor belt. The liftable testing platform 200 has two recessed grooves 240 on its surface to avoid the conveyor belt. The recessed grooves 240 are positioned in the middle area of ​​the fine grid connection area 430. The IV testing lamp source 300 is correspondingly positioned to the liftable testing platform 200. The liftable testing platform 200 is equipped with... Driven by a first lifting mechanism 210 below it, the interior of the liftable test platform 200 is a negative pressure chamber 270. A test probe device 260 is installed inside the liftable test platform 200. The test probe device 260 includes a probe 261, a test frame 262, and a second lifting mechanism 263. The probe 261 is fixed on the test frame 262 and extends out of the platform surface of the liftable test platform 200. The second lifting mechanism 263 drives the probe 261 to rise and fall through the test frame 262. The platform surface of the liftable test platform 200 is provided with a rubber sealing ring 230 and an air suction hole 250. The rubber sealing ring 230 is embedded in the platform surface of the liftable test platform and surrounds all the probes 261 and the air suction hole 250. The rubber sealing ring 230 is set to contact the back of the solar cell 400. The liftable test platform 200 is also provided with a solar cell limiting device 220.

[0027] The battery cell limiting device 220 consists of two sets of limiting blocks 221 installed on the adjacent sides of the liftable test platform and two sets of movable blocks 222 set on the other two sides of the liftable test platform and driven by an automated mechanism. The limiting blocks 221 are adjustablely fixed on the liftable test platform 200 by bolts 223.

[0028] During operation, the back-contact solar cell 400, with its front side facing up and electrodes facing down, is conveyed instantaneously clockwise by the conveyor mechanism 100. Through an adjustable conveyor cycle, it is accurately conveyed to a position directly above the liftable test platform 200 and directly below the IV test light source 300. At this time, the conveyor belt and the solar cell are positioned between the liftable test platform 200 and the IV test light source 300. The conveyor mechanism 100 pauses briefly, and then resumes operation after the testing is completed. Figure 4As shown, the first lifting mechanism 210 on the liftable test platform 200 rises and removes the back-contact solar cell 400 from the conveyor belt. At this time, the conveyor belt enters the sink 240, and the back-contact solar cell 400 contacts the rubber sealing ring 230 and stops on the rubber sealing ring 230. Then, the movable block 222 contacts the edge of the back-contact solar cell 400 and moves towards the limiting block 221. When the back-contact solar cell 400 is placed in the correct test position, the air intake 250 starts to draw air, and the back-contact solar cell 400 is adsorbed on the liftable test platform 200 through the sealed space formed by the rubber sealing ring 230. At this time, the back-contact solar cell 400 and the test probe 261 are in a state of only slight contact or no contact. The second lifting mechanism 263 then... The test frame 262 drives the probe 261 to rise and fall, forming an ohmic contact with the back electrode of the back-contact solar cell 400. At the same time, the IV test lamp 300 starts working, generating a standard solar spectrum light source with an energy of 800-1000W / m2. The IV test system collects and summarizes the IV test data, completing the IV test acquisition work. After the test is completed, the second lifting mechanism 263 drives the probe 261 to fall, the vacuum suction device breaks the air, and the first lifting mechanism 210 on the liftable test platform 200 performs a descent operation, placing the back-contact solar cell 400 back onto the conveyor belt 100, returning it to its state before rising. The conveyor belt 100 starts running again, accurately conveying the next back-contact solar cell 400 directly above the liftable test platform 200 for the above test actions.

[0029] Example 2

[0030] Unlike Example 1, as Figure 6 As shown, the back electrode of the back contact solar cell 400 has no main grid, only a fine grid 440.

[0031] like Figure 7 As shown, 10 virtual master grid positions are set up, and they are designated as positive electrode region 410, negative electrode region 420, and fine grid connection region 430. The fine grid connection region 430 is the area that the probe will not contact.

[0032] The test probe 261 is a flat-head probe and is set to correspond to the fine grid. All other settings are the same as in Example 1. This example is mainly for testing solar cells without a grid back contact and can solve the problem of pipeline testing of such cells.

[0033] Comparative Example 1:

[0034] Unlike Embodiment 1, the battery cells are not transported by conveyor belt, but by an expensive robotic arm. In this case, the liftable test platform 200 in Embodiment 1 does not need to be equipped with a first lifting mechanism 210 and a sink 270, and the rubber sealing ring 230 only needs to be installed in one area.

[0035] Compared to Example 1, this solution is more expensive and requires the introduction of a robotic arm.

[0036] In summary, this invention uses a conveyor belt for cell transport and avoids the risk of scratching the front of the cell during testing, which would otherwise reduce battery efficiency. This makes it suitable for mass production lines, significantly reducing production costs and increasing efficiency. The invention utilizes a rubber sealing ring to create a sealed vacuum chamber, and a lifting mechanism allows the test probe to avoid the problem of the probe hitting the back of the cell and failing to create a vacuum chamber, achieving optimal platform adsorption. Furthermore, by raising the test probe to contact the electrodes of the back-contact battery, optimal ohmic contact is formed, solving the problems of poor contact and low accuracy in testing.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A back-contact solar cell IV testing device, characterized in that: The device includes a conveyor mechanism, a liftable test platform, an IV test lamp, and a back-contact solar cell. The liftable test platform is located below the conveyor mechanism, which is a multi-strand conveyor belt. Two recessed grooves are provided on the platform surface to avoid the conveyor belt. The IV test lamp is positioned corresponding to the liftable test platform. The liftable test platform is driven by a first lifting mechanism installed below it. The interior of the liftable test platform is a negative pressure chamber. A test probe device is installed inside the liftable test platform. The test probe device includes a probe, a test frame, and a second lifting mechanism. The probe is fixed to the test frame and extends out of the liftable test platform surface. The second lifting mechanism drives the probe to move up and down via the test frame. The liftable test platform surface is provided with a rubber sealing ring and an air intake hole. The rubber sealing ring is embedded in the platform surface and surrounds all the probe and air intake hole. The rubber sealing ring is positioned corresponding to the back-contact solar cell. A solar cell limiting device is also provided on the liftable test platform.

2. The back-contact solar cell IV testing device according to claim 1, characterized in that: The back-contact solar cell has no electrode grid lines on the front side and contains 10 main grids on the back side. Each main grid includes a positive electrode and a negative electrode. The two main grid lines are connected by a fine grid. The fine grid connection area between adjacent main grids is an area that the probe will not touch.

3. The back-contact solar cell IV testing device according to claim 1, characterized in that: The back-contact solar cell has no electrode grid lines on the front and no main grid on the back, only a fine grid. Ten sets of virtual main grid positions are set and configured as positive electrode area, negative electrode area and fine grid connection area. The fine grid connection area is the area that the probe will not touch.

4. The back-contact solar cell IV testing device according to claim 2 or 3, characterized in that: The sinkhole on the liftable test platform is positioned in the middle area of ​​the fine grid connection region.

5. The back-contact solar cell IV testing device according to claim 1, characterized in that: The rubber sealing rings are installed in the three areas of the liftable test platform, which are divided into three sections by the corresponding sink. The rubber sealing rings are 2mm higher than the platform surface.

6. The back-contact solar cell IV testing device according to claim 1, characterized in that: The battery cell limiting device consists of two sets of limiting blocks installed on adjacent sides of the liftable test platform and two sets of movable blocks installed on the other two sides of the liftable test platform, driven by an automated mechanism.

7. The IV testing device for a back-contact solar cell according to claim 6, characterized in that: The limiting block is fixed to the liftable test platform surface in an adjustable manner by bolts.

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