Clamp applied to battery detection

Abstract

A lifting mechanism is installed on a base, a cooling device is arranged above the lifting mechanism and fixed with the lifting mechanism, a carrying table comprises an insulating plate on the lower layer and a conductive plate on the upper layer, the carrying table is arranged above the cooling device and fixed with the cooling device, and a test board is located above the carrying table; a conductive flat cable of the test board is located on the lower surface of the light-transmitting plate, an ampere meter terminal and a voltmeter terminal are led out from the conductive flat cable, the battery is placed on the conductive plate with the light-receiving surface facing upwards, all grid lines on the back surface of the battery are in contact conduction with the conductive plate, the lifting mechanism ascends, and the grid lines on the light-receiving surface of the battery are in contact conduction with the conductive flat cable; and the electric control cabinet is provided with a temperature controller and a temperature control switch associated with the cooling device, a lifting switch associated with the lifting mechanism and an associated power supply. When the positive electrode and the negative electrode are respectively designed on the two surfaces of the cell, the device is suitable for compatible fixation of solar cells with different electrode patterns, sizes and thicknesses during IV testing.

Description

Technical Field

[0001] This application relates to a testing fixture for solar cells. Background Technology

[0002] Photovoltaic conversion efficiency is the most direct test method for evaluating the performance of solar cells. Currently, IV test fixtures mainly consist of a simulated solar light source, a test source meter, a computer with analysis software, and a battery fixing device.

[0003] Existing battery mounting devices typically consist of probe arrays arranged symmetrically along the main grid direction, with the number of probe arrays varying depending on the number of main grids in the battery being tested. Furthermore, the batteries are usually fixed using a mounting base. This means that existing battery mounting devices can only test one type of solar cell, and the probe arrays blocking a portion of the battery surface can cause significant light loss.

[0004] However, perovskite and other solar cells are still under continuous research and development. The electrode pattern, size, thickness and structure of the cell may change. Therefore, using existing cell fixing devices to fix the cell requires designing different cell fixing devices for different cells. For example, when the electrode pattern changes, the number of probes needs to be adjusted accordingly. Utility Model Content

[0005] Purpose of the utility model: The purpose of this utility model is to provide a fixture for battery testing, which is suitable for the compatible fixation of solar cells with different electrode patterns, sizes and thicknesses when the positive and negative electrodes are designed on both sides of the battery.

[0006] Technical solution: A fixture for battery testing includes a test platform, a stage, a cooling device, a lifting mechanism, a base, and an electrical control cabinet. The lifting mechanism is mounted on the base, and the cooling device is fixed above and to the lifting mechanism. The stage includes a lower insulating plate and an upper conductive plate. The stage is fixed above and to the cooling device, and the test platform is located above the stage.

[0007] The test stand includes a light-transmitting plate and several conductive cables. The conductive cables are located on the lower surface of the light-transmitting plate. The ammeter and voltmeter terminals are led out from the conductive cables. The battery is placed on the conductive plate with the light-receiving surface facing upward. All the grid lines on the back of the battery are in contact with the conductive plate and conduction. The lifting mechanism rises, and the grid lines on the light-receiving surface of the battery are in contact with the conductive cables and conduction.

[0008] The electrical control cabinet is equipped with a temperature controller and a temperature control switch associated with the cooling device, a lifting switch associated with the lifting mechanism, and a power supply.

[0009] Furthermore, an elastic buffer layer is laid on the lower surface of the light-transmitting plate, and the conductive cable is located on the lower surface of the elastic buffer layer. When the lifting mechanism rises, the conductive plate presses against the light-transmitting plate, allowing the grid lines on the light-receiving surface of the battery to make contact and conduct electricity. Since the grid lines have a certain height, the elastic buffer layer can compensate for the unevenness of the light-receiving surface, ensuring effective contact and conduction between the grid lines and the conductive cable.

[0010] Ideally, the material of the elastic buffer layer is EVA or POE.

[0011] Furthermore, the diameter of the conductive cable is 0.5±0.05μm. The linear conductive cable greatly reduces light-blocking loss. The conductive cable and the conductive plate are made of pure gold or gold-plated copper. The light-transmitting plate is made of quartz, which has high light transmittance and ensures that the light-receiving surface of the battery is irradiated by a simulated sunlight source.

[0012] Furthermore, several of the conductive cables are arranged in parallel, and when the battery is placed on the conductive plate, the conductive cables are aligned with the direction of the main grid. This ensures effective contact and conductivity between the conductive cables and the sub-grid lines, and is also applicable to batteries without a main grid.

[0013] Furthermore, the test platform also includes an inner frame and an outer frame. The inner frame is installed around the light-transmitting plate and is located inside the outer frame, forming a pull-out and sliding connection. In the pull-out and sliding direction, a quick-connect connector A is provided on one side A of the outer frame. The ammeter terminals and voltmeter terminals are horizontally fixed on the inner frame on the side B corresponding to side A. The ammeter terminals and voltmeter terminals are respectively connected to one end of one of the quick-connect connectors A, and the other end of the quick-connect connector A is connected to the source meter, facilitating quick connection between the ammeter terminals and the voltmeter terminals and the source meter.

[0014] Furthermore, several vacuum adsorption holes are formed on the upper surface of the conductive plate. These vacuum adsorption holes are connected to the outside through vacuum pipelines. After the battery is placed on the conductive plate, it can be fixed through the vacuum adsorption holes.

[0015] Furthermore, the cooling device includes a TEC cooling chip, a heat insulation plate, a heat sink, and a cooling fan. The TEC cooling chip is fixed above and to the heat insulation plate. The insulating plate on the lower layer of the platform is fixed above and to the heat insulation plate. The TEC cooling chip is located between the platform and the heat insulation plate. The heat insulation plate is fixed above and to the heat sink. The cooling fan is mounted on the heat sink.

[0016] Furthermore, the test platform is fixed to the support column on the base.

[0017] Furthermore, the base includes a base plate and a frame, with the base plate located inside the frame, forming a pull-out and sliding connection. In the pull-out and sliding direction, a quick-connect connector B is provided on one side B of the frame, and a conductive post is horizontally fixed on the side A of the base plate corresponding to side B. One end of the conductive post is connected to the quick-connect connector B, and the other end of the quick-connect connector B is connected to the power supply. The conductive post is associated with the electrical control cabinet, facilitating quick connection of the entire battery fixing device to the power supply.

[0018] Beneficial Effects: This utility model's fixture for battery testing is suitable for solar cells with different electrode patterns, sizes, and thicknesses when the positive and negative electrodes are designed on opposite sides of the battery. It provides compatible fixation during IV testing, especially suitable for situations where the electrode patterns, sizes, and thicknesses of batteries frequently change during R&D design. The conductive plate on the platform is compatible with batteries up to the maximum design size; the conductive cables on the test platform are laid out to be compatible with the battery's electrode pattern, ensuring effective contact and conduction between the conductive cables and the grid lines. The linear conductive cables greatly reduce light-blocking losses; the lifting mechanism raises the battery on the platform so that it is effectively flattened and clamped between the conductive plate and the light-transmitting plate, compatible with battery thickness. This ensures effective contact and conduction between the positive grid line electrode on the back of the battery and the conductive plate, and effective contact and conduction between the negative grid line electrode on the light-receiving side of the battery and the conductive cables. The conductive cables are then led out through the ammeter and voltmeter terminals and connected to the source meter to form a circuit for IV testing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the complete structure of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure after removing the frame of the test platform and the base;

[0021] Figure 3 for Figure 2 Exploded view;

[0022] Figure 4 This is a schematic diagram of the test bench structure;

[0023] Figure 5 This is a schematic diagram of the present invention in the IV test fixture. Detailed Implementation

[0024] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0025] A fixture for battery testing, as shown in the attached image. Figures 1-3 As shown, it includes a test stand 1, a platform 2, a cooling device 3, a lifting mechanism 4, a base 5, and an electrical control cabinet 6.

[0026] The stage 2 is used to place the battery to be tested, and includes a lower insulating plate 21 and an upper conductive plate 22. The conductive plate is made of pure gold or gold-plated copper. Several vacuum adsorption holes 23 are formed on the upper surface of the conductive plate 22, as shown in the attached figure. Figure 2 Several vacuum adsorption holes are arranged in a circular and linear pattern. These holes are then connected to the outside via vacuum tubing to provide and break the vacuum. After the battery is placed on the conductive plate, it can be fixed through the vacuum adsorption holes. The conductive plate is not smaller than the maximum design size of the battery. When the battery under test is placed on the conductive plate, the backlight side should face down and the light-receiving side should face up, so that all grid lines on the back of the battery are in contact with the conductive plate and conduct electricity. If the size of the battery under test is smaller than the conductive plate, the unshielded areas of the conductive plate should be covered as much as possible with black insulating tape or other insulating materials before performing IV testing.

[0027] The cooling device 3 is used to cool the test stage 2 during testing, providing a temperature that meets the IV test requirements. The cooling device 3 includes a TEC cooling chip 31, a heat insulation plate 32, a heat sink 33, a cooling fan 34, and a thermocouple 35. The TEC cooling chip 31 is fixed above and to the heat insulation plate 32; multiple TEC cooling chips can be arranged according to the design. The heat insulation plate 32 is fixed above and to the heat sink 33. The cooling fan 34 is mounted on the heat sink 33; a groove can be made in the fin area on the lower side of the heat sink 33 to embed the cooling fan 34. The cooling device 3 is located below the test stage 2, fixed to the edge of the upper surface of the heat insulation plate 32 via the lower surface of the insulating plate 21 of the test stage 2. The TEC cooling chip 31 is positioned between the insulating plate 21 and the heat insulation plate 32, ensuring it adheres to the insulating plate for effective cooling. The thermocouple 35 is located in the area of ​​the TEC cooling chip 31, monitoring the real-time temperature of the insulating plate 21 of the test stage 2; the thermocouple is fixed to the insulating plate.

[0028] The lifting mechanism 4 is located below the cooling device 3 and is fixed to the lower side of the heat dissipation plate 33 of the cooling device 3. The lifting mechanism 4 is mounted on the base 5. When the lifting mechanism rises, it drives the cooling device and the platform to rise synchronously. When the lifting mechanism descends, it drives the cooling device and the platform to descend synchronously.

[0029] Combined with appendix Figure 4 As shown, the test platform 1 is located above the platform 2 and has a gap between it and the lowered platform to allow for the placement and removal of the battery to be tested on the platform. The test platform 1 is fixed to the support column 51 set on the base 5 to keep the position of the test platform fixed.

[0030] The test platform 1 includes a light-transmitting plate 11, several conductive cables 12, an inner frame 15, and an outer frame 16. The light-transmitting plate 11 needs to have high light transmittance, for example, it is made of quartz material. The inner frame 15 is installed around the light-transmitting plate 11. An elastic buffer layer, such as EVA or POE, is laid on the lower surface of the light-transmitting plate 11. The conductive cables 12 are located on the lower surface of the elastic buffer layer and should be in contact with the elastic buffer layer. The material of the conductive cables is pure gold or gold-plated copper, and the diameter is 0.5±0.05μm. When the lifting mechanism rises, the conductive plate is pressed against the light-transmitting plate, so that the grid lines on the light-receiving surface of the battery can contact the conductive cables. Sufficient contact and conduction are achieved. Since the grid lines have a certain height, the elastic buffer layer can compensate for the unevenness of the light-receiving surface, ensuring effective contact and conduction between the grid lines and the conductive cables. The grid lines and conductive cables only need to be able to make contact and conduct. It is preferable that several conductive cables 12 are arranged in parallel, making this device versatile. When performing IV tests on solar cells with different electrode patterns, sizes, and thicknesses, it can ensure effective contact and conduction between the conductive cables and the grid lines. It is preferable that the conductive cables 12 are aligned with the main grid direction to ensure effective contact and conduction between the conductive cables and the sub-grid lines. This method is also applicable to gridless cells. The two ends of each conductive cable 12 can be fixed to it using the inner frame 15.

[0031] All the conductive cables 12 converge to lead out ammeter terminals 13 and voltmeter terminals 14. The two ammeter terminals are used to connect to the source meter to test the current, and the two voltmeter terminals are used to connect to the source meter to test the voltage. To facilitate the connection of the ammeter terminals and voltmeter terminals to the source meter, an inner frame 15 and an outer frame 16 are provided. The inner frame 15 is located inside the outer frame 16 and adopts a sliding rail connection, forming a pull-out sliding connection. In the pull-out sliding direction, a quick-connect connector A17 is provided on one side A161 of the outer frame 16. The ammeter terminals 13 and voltmeter terminals 14 are horizontally fixed on the inner frame 15 on the side B151 corresponding to the side A161. The ammeter terminals 13 and voltmeter terminals 14 are respectively connected to one end of a quick-connect connector A17, and the other end of the quick-connect connector A17 can be quickly connected to the source meter.

[0032] The electrical control cabinet 6 is equipped with a temperature controller 61 and a temperature control switch 62 associated with the cooling device 3. The temperature control switch controls the operation of the TEC cooling chip, while the temperature controller controls the set temperature and provides real-time temperature feedback to maintain a constant temperature on the platform. A lifting switch 63 associated with the lifting mechanism 4 is also provided, controlling the operation of the lifting mechanism. The electrical control cabinet 6 is also connected to a power supply to provide power to the cooling device and the lifting mechanism. A display screen or other human-machine interface can also be installed on the electrical control cabinet 6 as needed.

[0033] To improve the integration of the device, the electrical control cabinet 6 can be installed on the base 5. The base 5 is configured as a base plate 52 and a frame 53. The lifting mechanism 4 is installed on the base plate 52, which is located inside the frame 53. The base plate 52 is in a sliding rail configuration, and the two form a pull-out and sliding connection. In the pull-out and sliding direction, a quick-connect connector B54 is provided on one side B531 of the frame 53. A conductive post 55 is horizontally fixed on the side A521 of the base plate 52 corresponding to the side B531. The conductive post 55 is associated with the electrical control cabinet 6 and is connected to one end of the quick-connect connector B54. The other end of the quick-connect connector B54 can be quickly connected to the power supply.

[0034] The fixture of this utility model, applied to battery testing, is arranged on the IV testing fixture as shown in the attached figure. Figure 5 As shown, a simulated sunlight source shines down onto the light-transmitting plate.

[0035] This utility model relates to a fixture for battery testing, suitable for fixing solar cells with different electrode patterns, sizes, and thicknesses during IV testing when the positive and negative electrodes are designed on opposite sides of the battery. It is particularly suitable for situations where the electrode patterns, sizes, and thicknesses of batteries frequently change during research and development. The conductive plate on the stage is compatible with batteries up to the maximum design size; the conductive cables on the test stage are laid out to be compatible with the battery's electrode pattern, ensuring effective contact and conduction between the conductive cables and the grid lines. The linear conductive cables significantly reduce light-blocking losses. The lifting mechanism raises the battery on the stage to be effectively flattened and clamped between the conductive plate and the light-transmitting plate, accommodating battery thickness. This ensures effective contact and conduction between the positive grid line electrode on the back of the battery and the conductive plate, and effective contact and conduction between the negative grid line electrode on the light-receiving side of the battery and the conductive cables. The conductive cables are then led out through the ammeter and voltmeter terminals and connected to the source meter to form a circuit for IV testing.

[0036] Solar cells with positive and negative electrodes designed on two separate sides, such as TOPCon, HJT, and PERC crystalline silicon cells, and perovskite stacked (TOPCon, HJT, PERC) crystalline silicon cells.

Claims

1. A fixture for battery testing, characterized in that: The utility model provides a test platform, which comprises a test table (1), a carrier table (2), a cooling device (3), a lifting mechanism (4), a base (5) and an electric control cabinet (6), the lifting mechanism (4) is installed on the base (5), the cooling device (3) is fixed above the lifting mechanism (4), the carrier table (2) comprises an insulating plate (21) and a conductive plate (22), the carrier table (2) is fixed above the cooling device (3), and the test table (1) is located above the carrier table (2). The test table (1) comprises a light-transmitting plate (11) and a plurality of conductive wires (12), the conductive wires (12) are located on the lower surface of the light-transmitting plate (11), current meter connecting terminals (13) and voltmeter connecting terminals (14) are led out from the conductive wires (12), a battery is placed on the conductive plate (22) with the light-receiving surface upward, all grid lines on the back surface of the battery are in contact with the conductive plate (22), the lifting mechanism (4) is lifted, and the grid lines on the light-receiving surface of the battery are in contact with the conductive wires (12). The electric control cabinet (6) is provided with a temperature controller (61) and a temperature control switch (62) associated with the cooling device (3), a lifting switch (63) associated with the lifting mechanism (4) and a power supply.

2. The clamp for battery detection according to claim 1, wherein: An elastic buffer layer is laid on the lower surface of the light-transmitting plate (11), and the conductive wires (12) are located on the lower surface of the elastic buffer layer.

3. The clamp for battery detection according to claim 2, wherein: The material of the elastic buffer layer is EVA or POE.

4. The clamp for battery detection of claim 1, wherein: The diameter of the conductive wires (12) is 0.5±0.05 μm, the materials of the conductive wires (12) and the conductive plate (22) are pure gold or copper-plated gold, and the material of the light-transmitting plate (11) is quartz.

5. The clamp for battery detection of claim 1, wherein: The plurality of conductive wires (12) are arranged in parallel, and when the battery is placed on the conductive plate (22), the conductive wires (12) are consistent with the main grid direction.

6. The clamp for battery detection of claim 1, wherein: The test table (1) further comprises an inner frame (15) and an outer frame (16), the inner frame (15) is installed around the light-transmitting plate (11), the inner frame (15) is located inside the outer frame (16), and the two form a pull-and-translation connection; in the pull-and-translation direction, a quick plug A (17) is arranged on one side edge A (161) of the outer frame (16), the current meter connecting terminals (13) and the voltmeter connecting terminals (14) are fixed on a side edge B (151) of the inner frame (15) corresponding to the side edge A (161) in the transverse direction, the current meter connecting terminals (13) and the voltmeter connecting terminals (14) are respectively connected to one end of the quick plug A (17), and the other end of the quick plug A (17) is connected to a source meter.

7. The clamp for battery detection of claim 1, wherein: A plurality of vacuum adsorption holes (23) are formed in the upper surface of the conductive plate (22), and the vacuum adsorption holes (23) are connected to the outside through a vacuum pipeline.

8. The clamp for battery detection of claim 1, wherein: The cooling device (3) comprises a TEC refrigeration sheet (31), a heat insulation plate (32), a heat dissipation plate (33) and a heat dissipation fan (34), the TEC refrigeration sheet (31) is fixed above the heat insulation plate (32), the insulation plate (21) of the lower layer of the carrier (2) is fixed above the heat insulation plate (32), the TEC refrigeration sheet (31) is between the carrier (2) and the heat insulation plate (32), the heat insulation plate (32) is fixed above the heat dissipation plate (33), and the heat dissipation fan (34) is installed on the heat dissipation plate (33).

9. The clamp for battery detection of claim 1, wherein: The test bench (1) is fixed with the support (51) on the base (5).

10. The clamp for battery detection of claim 1, wherein: The base (5) comprises a bottom plate (52) and a frame (53), the bottom plate (52) is inside the frame (53), and the two form a pull translation connection; in the pull translation direction, a quick plug connector B (54) is arranged on one side edge B (531) of the frame (53), a conductive column (55) is transversely fixed on a side edge A (521) of the bottom plate (52) corresponding to the side edge B (531), one end of the conductive column (55) is connected with the quick plug connector B (54), the other end of the quick plug connector B (54) is connected with the power supply, and the conductive column (55) is associated with the electric control cabinet (6).

Images