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 to 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 to 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. The method is suitable for compatible fixation of solar cells with different electrode patterns, sizes and thicknesses during IV testing when the positive electrode and the negative electrode are designed on the two surfaces of the cell respectively.

Description

Technical Field

[0001] The present application relates to a detection fixture for solar cells. Background Art

[0002] Photoelectric conversion efficiency is the most direct test method for evaluating the performance of solar cells. Currently, IV test equipment is mainly composed of a simulated sunlight light source, a test source meter, a computer with analysis software, a battery fixture, etc.

[0003] The existing battery fixture generally has rows of probes symmetrically arranged along the main grid direction. The number of probe rows increases or decreases according to the number of main grids of the battery being tested. In addition, the battery is usually fixed by a fixed base, which makes the existing battery fixture only able to test one type of solar cell. In addition, the probe row blocks a part of the battery surface, causing serious light loss.

[0004] However, perovskite and other solar cells are currently in a stage of continuous research and development, and the electrode pattern, size, thickness and structure of the battery may change. Therefore, in order to fix the battery with the existing battery fixture, different battery fixtures need to be designed for different batteries. For example, when the electrode pattern changes, the number of probes needs to be adjusted accordingly. Summary of the invention

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

[0006] Technical solution: A fixture for battery testing, comprising a test bench, a carrier, a cooling device, a lifting mechanism, a base, and an electric control cabinet, wherein the lifting mechanism is mounted on the base, the cooling device is fixed above the lifting mechanism, the carrier comprises a lower insulating plate and an upper conductive plate, the carrier is fixed above the cooling device, and the test bench is located above the carrier;

[0007] The test bench includes a light-transmitting plate and a plurality of conductive wirings, wherein the conductive wirings are located on the lower surface of the light-transmitting plate, and the ammeter terminals and the voltmeter terminals are led out from the conductive wirings. The battery is placed on the conductive plate with the light-receiving surface facing upward, and all the grid wires on the back of the battery are in contact with the conductive plate for conduction. The lifting mechanism rises, and the grid wires on the light-receiving surface of the battery are in contact with the conductive wirings for conduction.

[0008] 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.

[0009] Furthermore, an elastic buffer layer is laid on the lower surface of the light-transmitting plate, and the conductive wiring is located on the lower surface of the elastic buffer layer. When the lifting mechanism rises, the conductive plate is pressed toward the light-transmitting plate, so that the grid lines on the light-receiving surface of the battery can contact and conduct with the conductive wiring. Since the grid lines have a certain height, the elastic buffer layer can compensate for the unevenness of the light-receiving surface, ensuring that the grid lines and the conductive wiring are effectively contacted and conducted.

[0010] Optimally, the elastic buffer layer is made of EVA or POE.

[0011] Furthermore, the diameter of the conductive wiring is 0.5±0.05 μm, and the linear conductive wiring greatly reduces the shading loss. The conductive wiring and the conductive plate are made of pure gold or gold-plated copper, and the transparent plate is made of quartz with high transmittance, ensuring that the light-receiving surface of the battery is illuminated by a simulated sunlight light source.

[0012] Furthermore, a plurality of the conductive wirings are arranged in parallel, and when the battery is placed on the conductive plate, the conductive wirings are aligned with the main grid, which can ensure that the conductive wirings and the auxiliary grid wires form effective contact and conduction, and is also applicable to batteries without main grids.

[0013] Furthermore, the test bench also includes an inner frame and an outer frame, the inner frame is installed around the light-transmitting plate, and the inner frame is located inside the outer frame, and the two form a pull-out and translational connection. In the pull-out and translational direction, a quick-plug connector A is provided on a side A of the outer frame, and the ammeter terminal and the voltmeter terminal are transversely fixed on the side B of the inner frame corresponding to the side A. The ammeter terminal and the voltmeter terminal are respectively connected to one end of the quick-plug connector A, and the other end of the quick-plug connector A is connected to the source meter, so as to facilitate the quick connection of the ammeter terminal, the voltmeter terminal and the source meter.

[0014] Furthermore, a plurality of vacuum adsorption holes are provided on the upper surface of the conductive plate, and the 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 refrigeration sheet, a heat insulation plate, a heat sink, and a heat dissipation fan. The TEC refrigeration sheet is fixed above the heat insulation plate, the insulating plate under the carrier is fixed above the heat insulation plate, the TEC refrigeration sheet is between the carrier and the heat insulation plate, the heat insulation plate is fixed above the heat sink, and the heat dissipation fan is installed on the heat sink.

[0016] Furthermore, the test bench is fixed to the support pillars on the base.

[0017] Furthermore, the base includes a bottom plate and a frame, the bottom plate is located inside the frame, and the two form a pull-out and translational connection. In the pull-out and translational direction, a quick-plug connector B is provided on a side B of the frame, and a conductive column is laterally fixed on a side A of the bottom plate corresponding to the side B, the conductive column is connected to one end of the quick-plug connector B, and the other end of the quick-plug connector B is connected to the power supply, and the conductive column is associated with the electric control cabinet, so as to facilitate the quick connection of the entire battery fixing device with the power supply.

[0018] Beneficial effects: The fixture used for battery testing of the present invention is suitable for compatible fixation of solar cells with different electrode patterns, sizes, and thicknesses during IV testing when the positive and negative electrodes are designed on both sides of the battery, and is particularly suitable for the situation where the electrode patterns, sizes, and thicknesses of the battery change frequently during research and development design. The conductive plate on the carrier meets the compatibility requirements of batteries with the maximum design size or below; the conductive wiring on the test bench is arranged to be compatible with the electrode pattern of the battery, ensuring that the conductive wiring and the grid wire form effective contact and conduction, and the linear conductive wiring greatly reduces the shading loss; the lifting mechanism causes the battery on the carrier to rise to be effectively flattened and clamped between the conductive plate and the light-transmitting plate, compatible with the battery thickness, so that the positive grid wire electrode on the back of the battery is effectively in contact with the conductive plate, and the negative grid wire electrode on the light-receiving side of the battery is effectively in contact with the conductive wiring, and the conductive wiring is then led out through the ammeter terminal and the voltmeter terminal to connect to the source meter to form a loop for IV testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the complete structure of the present invention;

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

[0021] Figure 3 for Figure 2 Exploded diagram of

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

[0023] Figure 5 It is a schematic diagram of the present invention in an IV test tool. DETAILED DESCRIPTION

[0024] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

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

[0026] The carrier 2 is used to place the battery to be tested, and includes an insulating plate 21 at the bottom and a conductive plate 22 at the top. The conductive plate is made of pure gold or gold-plated copper. A plurality of vacuum adsorption holes 23 are provided on the upper surface of the conductive plate 22. Figure 2 Several vacuum adsorption holes are arranged in a circular or linear shape. The vacuum adsorption holes are then connected to the outside through vacuum pipes to provide vacuum and break vacuum. After the battery is placed on the conductive plate, it can be fixed through the vacuum adsorption holes. The conductive plate should not be smaller than the maximum design size of the battery. When the battery to be tested is placed on the conductive plate, the backlight side should be facing down and the light-receiving side should be facing up. Then all the grid lines on the back of the battery should be in contact with the conductive plate and conduct. When the size of the battery to be tested is smaller than the conductive plate, the unshielded conductive plate area of ​​the battery should be covered as much as possible with black insulating tape or other insulating materials before the IV test is performed.

[0027] The cooling device 3 is used to cool down the carrier 2 during the test and provide a temperature that meets the IV test requirements. The cooling device 3 includes a TEC cooling sheet 31, a heat insulation board 32, a heat sink 33, a heat dissipation fan 34, and a thermocouple 35. The TEC cooling sheet 31 is fixed to the heat insulation board 32 above it. Multiple TEC cooling sheets can be arranged according to the design. The heat insulation board 32 is fixed to the heat sink 33 above it. The heat dissipation fan 34 is installed on the heat sink 33. A groove can be opened in the fin area on the lower side of the heat sink 33 to embed the heat dissipation fan 34 for installation. The cooling device 3 is below the carrier 2 and is fixed by the lower surface of the insulating plate 21 of the lower layer of the carrier 2 and the upper surface edge of the heat insulation board 32. The TEC cooling sheet 31 is between the insulating plate 21 and the insulating plate 32. The TEC cooling sheet should be attached to the insulating plate to achieve the purpose of effective cooling. The thermocouple 35 is in the area of ​​the TEC cooling sheet 31 to monitor the real-time temperature of the insulating plate 21 of the carrier 2. The thermocouple is fixed on the insulating plate.

[0028] The lifting mechanism 4 is below the cooling device 3 and fixed to the lower side of the heat sink 33 of the cooling device 3. The lifting mechanism 4 is installed on the base 5. When the lifting mechanism rises, the cooling device and the platform rise synchronously, and when the lifting mechanism descends, the cooling device and the platform descend synchronously.

[0029] Combined with Figure 4 As shown, the test bench 1 is located above the carrier 2, with a distance between it and the lowered carrier so as to place and remove the battery to be tested on the carrier. The test bench 1 is fixed to the support 51 provided on the base 5 to keep the position of the test bench fixed.

[0030] The test bench 1 includes a light-transmitting plate 11, a plurality of conductive cables 12, an inner frame 15, and an outer frame 16. The light-transmitting plate 11 needs to have a high light transmittance, such as being made of quartz material. The inner frame 15 is installed around the light-transmitting plate 11. An elastic buffer layer is laid on the lower surface of the light-transmitting plate 11, such as being made of EVA or POE. The conductive cable 12 is located on the lower surface of the elastic buffer layer. The conductive cable should be attached to the elastic buffer layer. The material of the conductive cable is pure gold or copper plated with gold, and the diameter is 0.5±0.05μm. When the lifting mechanism rises, the conductive plate is pressed toward the light-transmitting plate, so that the grid line on the light-receiving surface of the battery and the conductive cable The grid lines are able to be in contact and conduction. Since the grid lines have a certain height, the elastic buffer layer can compensate for the unevenness of the light-receiving surface, ensuring that the grid lines and the conductive wiring lines are effectively in contact and conduction. The grid lines and the conductive wiring lines can be in contact and conduction. It is preferred that a plurality of conductive wiring lines 12 are arranged in parallel, so that the device of the present invention has universality. When performing IV tests on solar cells with different electrode patterns, sizes, and thicknesses, it is possible to ensure that the conductive wiring lines and the grid lines form effective contact and conduction. It is preferred that the conductive wiring lines 12 are in the same direction as the main grid, which can ensure that the conductive wiring lines and the auxiliary grid lines form effective contact and conduction, and it is also applicable to batteries without main grids. The two ends of each conductive wiring line 12 can be fixed on it with the help of the inner frame 15.

[0031] An ammeter terminal 13 and a voltmeter terminal 14 are led out from the confluence of all the conductive cables 12. The two ammeter terminals are used to connect to a source meter to test current, and the two voltmeter terminals are used to connect to a source meter to test voltage. In order to facilitate the connection of the ammeter terminals, the voltmeter terminals and 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 is matched with a slide rail. The two form a pull-out and translational connection. In the pull-out and translational direction, a quick-connect connector A17 is provided on a side A161 of the outer frame 16. The ammeter terminal 13 and the voltmeter terminal 14 are transversely fixed on a side B151 of the inner frame 15 corresponding to the side A161. The ammeter terminal 13 and the voltmeter terminal 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 electric control cabinet 6 is provided with a thermostat 61 and a temperature control switch 62 associated with the cooling device 3. The temperature control switch controls the operation of the TEC cooling sheet. The thermostat controls the set temperature and feeds back the real-time temperature to keep the platform at a constant temperature. A lifting switch 63 associated with the lifting mechanism 4 is provided. The lifting switch controls the operation of the lifting mechanism. The electric control cabinet 6 is also associated with a power supply to supply power to the cooling device and the lifting mechanism. A human-machine interaction interface such as a display screen can also be provided on the electric control cabinet 6 as needed.

[0033] In order to improve the integrity of the device, the electric control cabinet 6 can be installed on the base 5, and the base 5 is configured as a bottom plate 52 and a frame 53. The lifting mechanism 4 is installed on the bottom plate 52, and the bottom plate 52 is located inside the frame 53. The sliding rail is used to cooperate with each other, and the two form a pull-out and translational connection. In the pull-out and translational direction, a quick-plug connector B54 is provided on a side B531 of the frame 53, and a conductive column 55 is laterally fixed on a side A521 of the bottom plate 52 corresponding to the side B531. The conductive column 55 is associated with the electric control cabinet 6, and the conductive column 55 is connected to one end of the quick-plug connector B54. The other end of the quick-plug connector B54 can be quickly connected to a power supply.

[0034] The fixture for battery testing of the present invention is arranged on the IV test tool as shown in the attached figure. Figure 5 As shown, the simulated sunlight light source shines on the light-transmitting plate from top to bottom.

[0035] The clamp used for battery testing of the present invention is suitable for compatible fixation of solar cells with different electrode patterns, sizes and thicknesses during IV testing when the positive and negative electrodes are designed on both sides of the battery, and is particularly suitable for the situation where the electrode patterns, sizes and thicknesses of the battery change frequently during research and development design. The conductive plate on the carrier meets the compatibility with batteries of the maximum design size or below; the conductive wiring on the test bench is arranged to be compatible with the electrode pattern of the battery, ensuring that the conductive wiring and the grid wire form effective contact and conduction, and the linear conductive wiring greatly reduces the shading loss; the lifting mechanism makes the battery on the carrier rise to be effectively flattened and clamped between the conductive plate and the light-transmitting plate, compatible with the battery thickness, so that the positive grid wire electrode on the back of the battery is effectively in contact and conduction with the conductive plate, and the negative grid wire electrode on the light-receiving side of the battery is effectively in contact and conduction with the conductive wiring, and the conductive wiring is then led out through the ammeter terminal and the voltmeter terminal to connect with the source meter to form a loop for IV testing.

[0036] A solar cell with positive and negative electrodes designed on both sides, such as TOPCon, HJT, PERC crystalline silicon cells, and perovskite stacked (TOPCon, HJT, PERC) crystalline silicon cells.

Claims

1. A fixture for battery testing, characterized in that: The test bench comprises a test bench (1), a carrier (2), a cooling device (3), a lifting mechanism (4), a base (5), and an electric control cabinet (6); the lifting mechanism (4) is mounted on the base (5); the cooling device (3) is fixed above the lifting mechanism (4); the carrier (2) comprises a lower insulating plate (21) and an upper conductive plate (22); the carrier (2) is fixed above the cooling device (3); and the test bench (1) is located above the carrier (2); The test bench (1) comprises a light-transmitting plate (11) and a plurality of conductive wirings (12), wherein the conductive wirings (12) are located on the lower surface of the light-transmitting plate (11), and ammeter terminals (13) and voltmeter terminals (14) are led out from the conductive wirings (12). The battery is placed on the conductive plate (22) with the light-receiving surface facing upward, and all grid lines on the back of the battery are in contact with and connected to the conductive plate (22). When the lifting mechanism (4) rises, the grid lines on the light-receiving surface of the battery are in contact with and connected to the conductive wirings (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 an associated power supply.

2. A fixture for battery testing according to claim 1, characterized in that: An elastic buffer layer is laid on the lower surface of the light-transmitting plate (11), and the conductive wiring (12) is located on the lower surface of the elastic buffer layer.

3. A fixture for battery testing according to claim 2, characterized in that: The elastic buffer layer is made of EVA or POE.

4. The fixture for battery testing according to claim 1, characterized in that: The diameter of the conductive wiring (12) is 0.5±0.05 μm, the material of the conductive wiring (12) and the conductive plate (22) is pure gold or copper plated with gold, and the material of the light-transmitting plate (11) is quartz.

5. The fixture for battery testing according to claim 1, characterized in that: A plurality of the conductive wirings (12) are arranged in parallel, and when the battery is placed on the conductive plate (22), the conductive wirings (12) are aligned with the main grid.

6. A fixture for battery testing according to claim 1, characterized in that: The test bench (1) further comprises an inner frame (15) and an outer frame (16); the inner frame (15) is mounted around the light-transmitting plate (11); the inner frame (15) is located inside the outer frame (16); the two are connected by pulling and translating; in the pulling and translating direction, a quick-plug connector A (17) is provided on a side A (161) of the outer frame (16); the ammeter terminal (13) and the voltmeter terminal (14) are transversely fixed on a side B (151) of the inner frame (15) corresponding to the side A (161); the ammeter terminal (13) and the voltmeter terminal (14) are respectively connected to one end of the quick-plug connector A (17); and the other end of the quick-plug connector A (17) is connected to a source meter.

7. The fixture for battery testing according to claim 1, characterized in that: A plurality of vacuum adsorption holes (23) are provided on the upper surface of the conductive plate (22), and the vacuum adsorption holes (23) are connected to the outside through vacuum pipelines.

8. The fixture for battery testing according to claim 1, characterized in that: The cooling device (3) comprises a TEC refrigeration sheet (31), a heat insulation plate (32), a heat sink (33), and a heat dissipation fan (34); the TEC refrigeration sheet (31) is fixed above the heat insulation plate (32); the insulating plate (21) below 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 fixture for battery testing according to claim 1, characterized in that: The test bench (1) is fixed to a support column (51) on the base (5).

10. The fixture for battery testing according to claim 1, characterized in that: The base (5) comprises a bottom plate (52) and a frame (53), wherein the bottom plate (52) is located inside the frame (53), and the two are connected by pulling and sliding. In the pulling and sliding direction, a quick-plug connector B (54) is provided on a side B (531) of the frame (53), and a conductive column (55) is transversely fixed on a side A (521) of the bottom plate (52) corresponding to the side B (531). The conductive column (55) is connected to one end of the quick-plug connector B (54), and the other end of the quick-plug connector B (54) is connected to the power supply. The conductive column (55) is associated with the electric control cabinet (6).

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