CN219915451U

CN219915451U - Hot spot detection device for solar cell

Info

Publication number: CN219915451U
Application number: CN202321103135.1U
Authority: CN
Inventors: 卜涛; 孙飞龙; 郭梦龙; 李华
Original assignee: Taizhou Longi Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2023-05-09
Filing date: 2023-05-09
Publication date: 2023-10-27
Anticipated expiration: 2033-05-09

Abstract

The utility model discloses a solar cell hot spot detection device, which comprises: the probe rack comprises a plurality of probe rows which are arranged at intervals along a first direction, wherein each probe row comprises a conductive probe which is used for being contacted with an electrode on the back of a battery piece to be tested; the support frame comprises a plurality of support members which are arranged at intervals along the first direction, the plurality of support members respectively correspond to the plurality of probe rows, and the support members are used for contacting the front surface of the battery piece to be tested; the infrared camera comprises a shooting lens, and the shooting lens faces the front face of the battery piece to be tested. In the embodiment of the utility model, when the infrared camera shoots the battery piece to be detected through the plurality of supporting members, the front surface of the battery piece to be detected is less in shielding part, so that the detection omission risk during hot spot detection is reduced.

Description

Hot spot detection device for solar cell

Technical Field

The utility model relates to the technical field of photovoltaics, in particular to a device for detecting hot spots of a solar cell.

Background

The hot spot effect is one of the adverse factors affecting the performance and lifetime of the photovoltaic module, and therefore, hot spot detection needs to be performed on the solar cells in the photovoltaic module.

Currently, for IBC (Interdigitated Back Contact, cross back contact battery), when performing hot spot detection, the front surface of IBC is in contact with a layer of quartz glass, the back surface of IBC is in contact with a test probe row, the IBC is photographed by an infrared camera positioned below the test probe row, and the hot spot condition of IBC is determined according to an infrared thermal image obtained by the infrared camera.

However, the test probe row can shelter from the IBC, and shelter from more to the IBC, and the position that is sheltered from by the test probe row can not be caught by infrared camera, can appear the IBC and have hot spot defect and the condition that does not detect, and then cause the leak to examine the risk great.

Disclosure of Invention

The utility model provides a solar cell hot spot detection device, and aims to solve the technical problem of high missed detection risk during hot spot detection.

The embodiment of the utility model provides a device for detecting hot spots of a solar cell, which comprises the following components:

the probe rack comprises a plurality of probe rows which are arranged at intervals along a first direction, wherein each probe row comprises a conductive probe which is used for being contacted with an electrode on the back of a battery piece to be tested;

the support frame comprises a plurality of support members which are arranged at intervals along the first direction, the plurality of support members respectively correspond to the plurality of probe rows, and the support members are used for being in contact with the front surface of the battery piece to be tested;

the infrared camera comprises a shooting lens, and the shooting lens faces the front face of the battery piece to be tested.

Optionally, the supporting member includes the backup pad and sets up the flexible contact strip of bottom of backup pad, flexible contact strip be used for with the front contact of the battery piece that awaits measuring, flexible contact strip's material is any one of teflon, rubber, polyolefin.

Optionally, the flexible contact strip includes with the installation department that links to each other of the bottom of backup pad and with the contact portion that the installation department links to each other, the contact portion be used for with the front contact of the battery piece that awaits measuring, the cross section of contact portion is arc or fillet trapezium.

Optionally, the material of the supporting plate is any one of stainless steel, aluminum alloy and carbon fiber.

Optionally, in the first direction, a minimum spacing between two adjacent support members is greater than or equal to 8mm and less than or equal to 11mm;

the thickness of the support plate is greater than or equal to 0.9mm and less than or equal to 1.1mm along the first direction.

Optionally, the height of the support member is greater than or equal to 3mm and less than or equal to 5mm along a second direction, the second direction being perpendicular to the first direction.

Optionally, the infrared camera is connected to the sliding rail in a sliding manner, and the sliding direction of the infrared camera is consistent with the first direction.

Optionally, the support device further comprises two fixing plates, wherein the two fixing plates are respectively located at two sides of the support member along the extending direction of the support member, and two ends of each support member are respectively connected with the two fixing plates.

Optionally, the device further comprises two cover plates, wherein the two cover plates are respectively arranged on the two fixing plates in a covering way.

Optionally, the probe row includes a plurality of conductive probes spaced along a third direction, and the third direction is perpendicular to the first direction;

the support member comprises a connection plate, the connection plate comprises a connection part and a plurality of support parts connected with the connection part, the support parts are arranged at intervals along a third direction, and the support parts respectively correspond to the conductive probes.

In the embodiment of the utility model, the shooting lens of the infrared camera faces the front surface of the battery piece to be detected, and the plurality of supporting members used for being in contact with the front surface of the battery piece to be detected are distributed at intervals along the first direction, so that when the infrared camera shoots the battery piece to be detected through the plurality of supporting members, the front surface of the battery piece to be detected is less in shielding part, thereby reducing the detection omission risk during hot spot detection, reducing the hot spot risk of the finished solar battery piece and improving the yield of the finished solar battery piece; in addition, through the arrangement of the plurality of supporting members corresponding to the plurality of probe rows respectively, the up-down stress balance of the battery piece to be tested can be ensured, and the battery piece to be tested is prevented from generating faults.

The foregoing description is only an overview of the present utility model, and is intended to provide a better understanding of the technical means of the present utility model, as it is embodied in the present specification, and is intended to provide a better understanding of the above and other objects, features and advantages of the present utility model, as it is embodied in the following description.

Drawings

Fig. 1 is a schematic front view of a thermal spot detection device for a solar cell according to an embodiment of the present utility model;

fig. 2 is a schematic top view of a solar cell hot spot detecting device according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view taken along the direction A-A in FIG. 2;

fig. 4 is a schematic perspective view of a thermal spot detection device for a solar cell according to an embodiment of the present utility model;

FIG. 5 is an enlarged schematic view at B in FIG. 3;

fig. 6 is a schematic front view of a supporting member in the solar cell hot spot detecting device according to the embodiment of the present utility model;

fig. 7 is a schematic front view of another support member in the solar cell hot spot detection device according to the embodiment of the present utility model;

fig. 8 is a schematic front view of a supporting member in a solar cell hot spot detecting device according to an embodiment of the present utility model.

Reference numerals:

10-probe frame, 11-probe row, 111-conductive probe, 20-supporting member, 21-supporting plate, 22-flexible contact bar, 221-mounting part, 222-contact part, 23-connecting plate, 231-connecting part, 232-supporting part, 24-contact block, 30-infrared camera, 31-shooting lens, 40-slide rail, 50-fixing plate, 60-cover plate, 70-machine stand and 80-battery piece to be tested.

Detailed Description

Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

When the solar cell sheet current in the photovoltaic module is mismatched, hot spots can form, such as in the case of shadows, etc. When the hot spots occur, the temperature of the solar cell is high, and even the photovoltaic module can be burnt, so that great potential safety hazard is caused. IBC cells are becoming more and more novel and complex in the development of electrode patterns as a new technology for current photovoltaic cells.

Currently, hot spot detection devices for IBCs include quartz glass, test probe banks, and infrared cameras. The quartz glass is located above the row of test probes, and the IBC is located between the quartz glass and the row of test probes. The front side of the IBC is in contact with a layer of quartz glass, the back side of the IBC is in contact with a test probe row, and the IBC is pressed under the quartz glass through the test probe row. The quartz glass cannot transmit far infrared light, i.e. the part of the IBC, which generates the hot spots, cannot transmit through the quartz glass and is detected by the infrared camera, i.e. the infrared camera cannot capture the hot spot signals when arranged above the quartz glass, so that the infrared camera is arranged below the test probe row. The lens of the infrared camera is aligned to the center position of the back surface of the IBC, and when the IBC generates hot spots by current, the position of the hot spots is captured and imaged by the infrared camera.

However, the test probe row can shelter from IBC, and shelter from more to the IBC, and the position that is sheltered from by the test probe row can not be caught by infrared camera, can appear that the IBC exists hot spot defect and the condition that does not detect, and then causes the omission to examine the risk great to lead to the hot spot risk of solar wafer great. In order to solve the problems, the embodiment of the utility model provides a device for detecting hot spots of a solar cell.

The embodiment of the utility model discloses a device for detecting hot spots of a solar cell, which comprises the following components: the probe rack 10 comprises a plurality of probe rows 11 which are arranged at intervals along a first direction, wherein the probe rows 11 comprise conductive probes 111, and the conductive probes 111 are used for contacting with electrodes on the back surface of the battery piece 80 to be tested; the support frame comprises a plurality of support members 20 which are arranged at intervals along a first direction, the plurality of support members 20 respectively correspond to the plurality of probe rows 11, and the support members 20 are used for contacting the front surface of the battery piece 80 to be tested; the infrared camera 30 comprises a shooting lens 31, and the shooting lens 31 faces the front surface of the battery piece 80 to be tested.

Specifically, the battery piece 80 to be measured may be IBC. The first direction may refer to the direction shown by the arrow C in fig. 1. The probe row 11 specifically includes a plurality of conductive probes 111, and the conductive probes 111 are made of metal. The plurality of conductive probes 111 in one probe row 11 are spaced apart along a third direction, which may be referred to as a direction indicated by an arrow E in fig. 1 and 2, and which is perpendicular to the first direction. The back of the IBC is provided with a plurality of main grids, the conductive probe 111 specifically contacts with the main grid on the back of the battery piece 80 to be tested, and the conductive probe 111 forms good ohmic contact with the back of the battery piece 80 to be tested. The number of probe rows 11 may be correspondingly set according to the battery pieces 80 to be measured, and referring to fig. 3, the number of probe rows 11 is nineteen, for example. The number of support members 20 is equal to the number of probe rows 11. The positions of the plurality of support members 20 correspond to the positions of the plurality of probe rows 11, respectively.

The plurality of conductive probes 111 on the probe row 11 are used to apply a reverse voltage to the battery piece 80 to be tested. The infrared camera 30 is located above the support frame and the battery piece 80 to be tested, and the infrared camera 30 is used for shooting an infrared thermal image of the battery piece 80 to be tested through the support frame. The infrared camera 30 may be specifically located obliquely above the battery piece 80 to be measured. The entire probe holder 10 is movable in a second direction, which may be referred to as the direction indicated by the arrow D in fig. 1.

During testing, the battery piece 80 to be tested is rotated between the supporting frame and the probe frame 10 by the sucker gripper, and the right side of the battery piece 8 to be tested faces upwards; then the probe frame 10 moves upwards to press the battery piece 80 to be tested until the battery piece 80 is pressed to be in forced contact with the supporting member 20 and forms good ohmic contact with the conductive probe 111; then, a reverse voltage is applied to the battery piece 80 to be tested through the plurality of conductive probes 111; finally, the infrared camera 30 photographs the infrared thermal image of the battery piece 80 to be measured. After the reverse voltage is applied to the battery piece 80 to be tested, the battery piece 80 to be tested heats, the temperature will rise, and the temperature at the position with the hot spot defect is abnormally high, so that whether the battery piece 80 to be tested has the hot spot defect can be detected through the infrared thermal image shot by the infrared camera 30.

In the embodiment of the utility model, the shooting lens 31 of the infrared camera 30 faces the front surface of the to-be-detected battery piece 80, and the plurality of supporting members 20 for contacting with the front surface of the to-be-detected battery piece 80 are distributed at intervals along the first direction, so that when the infrared camera 30 shoots the to-be-detected battery piece 80 through the plurality of supporting members 20, the part of the front surface of the to-be-detected battery piece 80, which is shielded, is less, thereby reducing the detection omission risk during hot spot detection, reducing the hot spot risk of the finished solar battery piece, and improving the yield of the finished solar battery piece; in addition, through the arrangement of the plurality of supporting members 20 corresponding to the plurality of probe rows 11 respectively, the up-down stress balance of the battery piece 80 to be tested can be ensured, and the battery piece 80 to be tested is prevented from generating faults.

Referring to fig. 5 and 6, in one embodiment, the support member 20 includes a support plate 21 and a flexible contact strip 22 disposed at the bottom of the support plate 21, where the flexible contact strip 22 is used for contacting the front surface of the battery piece 80 to be tested, and the flexible contact strip 22 is made of any one of teflon, rubber, and polyolefin.

In particular, the hardness of the flexible contact strip 22 is less than the hardness of the support plate 21. The bottom of the support plate 21, i.e., the portion of the support plate 21 near the probe holder 10. The support plate 21 and the flexible contact strip 22 may be connected by adhesive. Referring to fig. 6 and 7, the flexible contact strip 22 is a strip-like structure. Referring to fig. 6, the support plate 21 may have a whole plate-like structure, and in this case, the support plate 21 is connected to the top of the flexible contact strip 22 near the whole bottom surface of the flexible contact strip 22. Referring to fig. 7, in another embodiment, the support plate 21 may include a first portion facing away from the flexible contact strip 22, which is a plate-like structure of a whole strip, and a plurality of second portions connected to the first portion, which are spaced apart in a third direction, and connected to the top of the flexible contact strip 22. The second subsection may be a plate-like structure or a needle-like structure. Of course, in other embodiments, based on the structure of the support plate 21 in fig. 6, a groove may be formed on the bottom surface of the support plate 21 near the flexible contact strip 22, where the groove is not connected to the top of the flexible contact strip 22.

The hardness of the teflon, the rubber and the polyolefin is low, so that when the flexible contact strip 22 made of any one of the teflon, the rubber and the polyolefin is in contact with the front surface of the battery piece 80 to be tested, damage such as bad scratch of the front surface of the battery piece 80 to be tested can be avoided.

Referring to fig. 5, the flexible contact strip 22 includes a mounting portion 221 connected to the bottom of the support plate 21 and a contact portion 222 connected to the mounting portion 221, the contact portion 222 being for contact with the front surface of the battery piece 80 to be measured, the contact portion 222 having an arc-shaped or rounded trapezoid-shaped cross section.

Specifically, the cross section of the contact portion 222 is a cross section of the contact portion 222 perpendicular to the extending direction of the flexible contact strip 22. The extending direction of the flexible contact strip 22 coincides with the third direction. The mounting portion 221 may have a rectangular cross section so that the mounting portion 221 is connected to the contact portion 222. When the cross section of the contact portion 222 is arc-shaped, referring to fig. 5, the cross section of the contact portion 222 may be semicircular arc-shaped, and at this time, the semicircular arc-shaped edge of the cross section of the contact portion 222 contacts the front surface of the battery piece 80 to be measured. When the cross section of the contact portion 222 is a rounded trapezoid, a short bottom edge of two parallel bottom edges of the rounded trapezoid contacts the front surface of the battery piece 80 to be measured. In the embodiment of the utility model, the cross section of the contact portion 222 is arc-shaped or rounded trapezoid, so that the contact area between the contact portion 222 and the front surface of the battery piece 80 to be tested can be reduced, and the risk of generating defects of the battery piece 80 to be tested is further avoided.

In other embodiments, the cross-section of the contact portion 222 may be rectangular in size equal to the cross-section of the mounting portion 221.

The material of the support plate 21 is any one of stainless steel, aluminum alloy, and carbon fiber. Specifically, the material of the support plate 21 is a hard material, which may be stainless steel, aluminum alloy, carbon fiber, or the like. In the embodiment of the utility model, through the arrangement, the hardness of the supporting plate 21 is higher, so that the supporting effect of the supporting member 20 on the battery piece 80 to be tested is ensured. In addition, the problem that quartz glass cannot penetrate far infrared light is avoided through the arrangement of the material of the flexible contact strip 22 and the material of the supporting plate 21.

In other embodiments, the material of the support plate 21 may be a high-strength organic polymer material.

In the first direction, the minimum spacing between two adjacent support members 20 is greater than or equal to 8mm and less than or equal to 11mm; in the first direction, the thickness of the support plate 21 is greater than or equal to 0.9mm and less than or equal to 1.1mm.

Specifically, the minimum spacing between any two adjacent support members 20 of the plurality of support members 20 is equal. In the first direction, the minimum spacing between two adjacent support members 20, specifically the spacing between the mounting portions 221 in two adjacent support members 20. The minimum spacing between two adjacent support members 20 in the first direction may be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, etc.

The thickness of the support plate 21 in the first direction may be referred to as t in fig. 5, and the thickness t of the support plate 21 may be 0.9mm, 0.95mm, 0.98mm, 1mm, 1.05mm, 1.1mm, etc. In the embodiment of the present utility model, by setting the minimum distance between two adjacent support members 20 and the thickness of the support plate 21 within the above range, the distance between two adjacent support members 20 can be as large as possible, so as to ensure that the portions of the plurality of support members 20, which are blocked by the front surface of the battery piece 80 to be tested, are less.

Referring to fig. 2, in the third direction, the length of the support member 20 is greater than the dimension of the battery cell 80 to be measured in the third direction. The length of the support member 20 in the third direction may be referred to as L in fig. 6. The length L of the support member 20 is greater than the dimension of the battery piece 80 to be measured in the third direction. The dimension of the battery piece 80 to be measured along the third direction may be the length of the battery piece 80 to be measured, or may be the width of the battery piece 80 to be measured.

The height of the support member 20 is greater than or equal to 3mm and less than or equal to 5mm in a second direction perpendicular to the first direction.

In particular, the second direction may refer to the direction shown by the D arrow in fig. 1 and 3. The height of the support member 20 in the third direction may refer to H in fig. 5, and the height H of the support member 20 may be 3mm, 3.5mm, 3.8mm, 4mm, 4.5mm, 5mm, etc. In the embodiment of the utility model, by setting the height of the supporting member 20 within the range, the shadow shading of the supporting member 20 is reduced, namely the shading of the front surface of the battery piece 80 to be tested is reduced, so that the detection omission risk during hot spot detection is reduced.

Referring to fig. 1 and 2, the device for detecting hot spots of a solar cell according to the embodiment of the present utility model further includes a sliding rail 40, the infrared camera 30 is slidably connected to the sliding rail 40, and a sliding direction of the infrared camera 30 is consistent with the first direction.

Specifically, the device for detecting the hot spots of the solar cell provided by the embodiment of the utility model further comprises a machine stand 70, and the sliding rail 40 is arranged on the machine stand 70. The slide rail 40 is slidably connected with a slider, the slider is connected with the infrared camera 30 through a mounting block, and the infrared camera 30 is slidably connected on the slide rail 40 through the mounting block and the slider. The connection mode of the sliding block and the installation block can be screw connection. The extending direction of the sliding rail 40 is consistent with the first direction, and the sliding block is slidingly connected to the sliding rail 40 along the first direction. The mounting block may be detachably connected to the infrared camera 30. The orientation angle of the infrared lens 31 of the infrared camera 30 can be adjusted according to actual requirements. In the embodiment of the utility model, the arrangement of the infrared camera 30 in the sliding connection on the sliding rail 40 enlarges the shooting range of the infrared camera 30 and can be matched with different shooting requirements.

Referring to fig. 1 to 4, the solar cell hot spot detection device provided in the embodiment of the utility model further includes two fixing plates 50, the two fixing plates 50 are respectively located at two sides of the support member 20 along the extending direction of the support member 20, and two ends of each support member 20 are respectively connected with the two fixing plates 50.

Specifically, the extending direction of the support member 20 coincides with the third direction. Both fixing plates 50 are connected to the table bracket 70. The fixing plate 50 may be provided with a slot, and the support member 20 may be inserted into the fixing plate 50. In the embodiment of the present utility model, by providing two fixing plates 50, the installation of a plurality of support members 20 can be performed.

Referring to fig. 1 to 4, the device for detecting hot spots of a solar cell according to the embodiment of the present utility model further includes two cover plates 60, and the two cover plates 60 are respectively disposed on the two fixing plates 50.

Specifically, the length of the cover plate 60 and the length of the fixing plate 50 may be equal in the first direction. In the third direction, the width of the cover plate 60 and the width of the fixing plate 50 may be equal. In the embodiment of the utility model, the arrangement of the cover plate 60 can ensure the beauty of the solar cell hot spot detection device.

Referring to fig. 1, the probe row 11 includes a plurality of conductive probes 111 spaced apart along a third direction, which is perpendicular to the first direction. Referring to fig. 8, in another embodiment, the support member 20 includes a connection plate 23, and the connection plate 23 includes a connection portion 231 and a plurality of support portions 232 connected to the connection portion 231, the plurality of support portions 232 being spaced apart along a third direction, the plurality of support portions 232 corresponding to the plurality of conductive probes 111, respectively.

Specifically, the third direction is also perpendicular to the second direction. The connection portion 231 and the support portion 232 may be integrally formed. The number of the supporting portions 232 in one supporting member 20 is equal to the number of the conductive probes 111 in one probe row 11. The positions of the plurality of supporting portions 232 correspond to the positions of the plurality of conductive probes 111, respectively. The number of the conductive probes 111 in one probe row 11 may be fourteen, and at this time, the number of the supporting portions 232 in one supporting member 20 is fourteen. The bottom of each supporting part 232 may be provided with a contact block 24, and the supporting parts 232 are in contact with the battery cells 80 to be measured through the contact blocks 24. The contact block 24 is made of any one of teflon, rubber and polyolefin. In the embodiment of the utility model, by the arrangement, the shadow shading of the supporting member 20 is further reduced, namely the shading of the front surface of the battery piece 80 to be detected is reduced, so that the detection omission risk in hot spot detection is reduced.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims

1. The utility model provides a solar wafer hot spot detection device which characterized in that includes:

2. The solar cell hot spot detection device according to claim 1, wherein the supporting member comprises a supporting plate and a flexible contact strip arranged at the bottom of the supporting plate, the flexible contact strip is used for contacting with the front surface of the cell to be detected, and the flexible contact strip is made of any one of teflon, rubber and polyolefin.

3. The solar cell hot spot detection device according to claim 2, wherein the flexible contact strip comprises a mounting portion connected with the bottom of the support plate and a contact portion connected with the mounting portion, the contact portion is used for contacting with the front surface of the cell to be detected, and the cross section of the contact portion is arc-shaped or rounded trapezoid-shaped.

4. The solar cell hot spot detection device according to claim 2, wherein the support plate is made of any one of stainless steel, aluminum alloy and carbon fiber.

5. The solar cell hot spot detection apparatus according to claim 2, wherein a minimum distance between two adjacent support members in the first direction is 8mm or more and 11mm or less;

6. The solar cell hot spot detection apparatus according to claim 1, wherein a height of the support member is 3mm or more and 5mm or less in a second direction perpendicular to the first direction.

7. The solar cell hot spot detection device according to claim 1, further comprising a slide rail, wherein the infrared camera is slidably connected to the slide rail, and wherein a sliding direction of the infrared camera is consistent with the first direction.

8. The solar cell hot spot detection device according to claim 1, further comprising two fixing plates, wherein the two fixing plates are respectively located at two sides of the supporting member along the extending direction of the supporting member, and two ends of each supporting member are respectively connected with the two fixing plates.

9. The device for detecting thermal spots of solar cells according to claim 8, further comprising two cover plates respectively covering the two fixing plates.

10. The solar cell hot spot detection device according to claim 1, wherein the probe row includes a plurality of the conductive probes arranged at intervals along a third direction, the third direction being perpendicular to the first direction;