CN219328837U - Photovoltaic cell EL test probe row - Google Patents

Abstract

The utility model relates to a photovoltaic cell EL test probe row which comprises an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are both made of insulating materials. The upper support is fixedly provided with at least one first elastic probe module, the lower support is fixedly provided with at least one second elastic probe module and at least one third elastic probe module, the second elastic probe modules and the third elastic probe modules are arranged side by side, one end, far away from a battery to be tested, of each second elastic probe module is connected with a first confluence piece, and the first confluence piece is connected with a first outgoing line. One end of the third elastic probe module, which is far away from the battery to be tested, is connected with a second confluence piece, a second outgoing line is connected to the second confluence piece, and a gap exists between the first confluence piece and the third elastic probe module. The photovoltaic cell EL test probe row can conduct EL test on an MWT cell simulation component end, and hidden cracks and fragments of a tested cell are not easy to cause.

Description

Photovoltaic cell EL test probe row

Technical Field

The utility model relates to the field of photovoltaic cell testing, in particular to a photovoltaic cell EL test probe row.

Background

In the existing photovoltaic cell testing device, an EL (electroluminescence) test is generally adopted to further detect internal defects, hidden cracks, fragments, cold joints, broken grids and abnormal single-chip cells with different conversion efficiencies of a solar cell module.

The MWT (Metal Wrap Through ) photovoltaic cell has a through hole in its silicon substrate, and the metal electrode is filled in the through hole, so that the current of the front electrode can be led to the back of the cell, thereby realizing a back contact structure, i.e. the positive and negative electrodes of the cell are both on the back of the cell. And TOPCON cells (tunnel oxide passivation cells) and HJT cells (heterojunction cells) and the like, the anode and cathode of which are distributed on the front and back sides of the cells.

Thus, when EL testing is performed for conventional photovoltaic cells, the probes in both the upper and lower probe rows need to be energized. When the EL test is carried out on the MWT photovoltaic cell, the test can be carried out only by one probe row because the anode and the cathode of the cell are arranged on the back of the cell. However, while the MWT photovoltaic cell shows uniform brightness when subjected to the cell end (i.e., the state after the cell is fabricated) EL test, the cell end (i.e., the state after the cell is packaged into a module) EL test shows uneven brightness, and thus the defect of the cell cannot be detected. In order to avoid the situation, when the EL test is performed on the MWT photovoltaic cell, the EL test is performed by simulating the end of the battery component, namely, the other side of the probe row is provided with a fixing component, the fixing component contacts with the front surface of the MWT photovoltaic cell during the test, and the probe row presses the back surface of the MWT photovoltaic cell, so that the MWT photovoltaic cell is clamped.

For example, patent grant publication number CN213484818U discloses an MWT battery EL testing device, which comprises a fixing component and a probe row, wherein glass is fixed in the fixing component, the probe row is located under a glass sheet, and a component to be tested is arranged between the glass and the probe row. The device can measure the problem of uneven current of the battery end EL, is consistent with the EL of the component end, can select uneven current chips at the battery end, and prevents degradation of the component caused by uneven current when manufacturing the battery component.

For example, the patent of the publication number CN211701971U discloses a photovoltaic cell test probe row, which comprises a substrate, the base plate bottom interval is provided with a plurality of bosss, the base plate is in the boss department is in the fixed voltage test needle of inserting of upper and lower direction, the base plate is in the fixed electric current test needle of inserting of upper and lower direction along the boss both sides, electric current test needle upper end and voltage test needle upper end are not in same horizontal plane, voltage test needle lower extreme runs through the metal strip and is in same horizontal plane with the metal strip lower extreme face. In the working state, the probe row clamps and detects the battery piece corresponding to the detection work below, the voltage and current probes do not adopt an up-down average mode, and the number of the current pins is increased to the greatest extent.

However, when EL testing is performed on MWT photovoltaic cells using the EL testing device of CN213484818U, the glass is a rigid structure, which is prone to cause hidden cracking and chipping of the cells, affecting cell yield. When the test probe row CN211701971U is used to perform EL test on the MWT photovoltaic cell, although the probe is used to replace glass on one side, the test row on the charged side uses metal strips in contact with the MWT photovoltaic cell, and the metal strips are also rigid structures, which also tend to cause hidden cracking and chipping of the cell.

Disclosure of Invention

The utility model aims to provide a photovoltaic cell EL test probe row which can conduct EL test on an MWT cell simulation component end and is not easy to cause hidden cracks and fragments on a tested cell.

The aim of the utility model is achieved by the following technical scheme:

the photovoltaic cell EL test probe row comprises an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are made of insulating materials, an upper probe module is fixed in the upper bracket, a lower probe module is fixed in the lower bracket, the upper probe module comprises a first elastic probe module, and the lower probe module comprises a second elastic probe module and a third elastic probe module; the first elastic probe module, the second elastic probe module and the third elastic probe module are respectively provided with at least one, the second elastic probe module and the third elastic probe module are arranged side by side, one end of the second elastic probe module, which is far away from the battery to be tested, is connected with a first confluence piece, and the first confluence piece is connected with a first outgoing line; one end of the third elastic probe module, which is far away from the battery to be tested, is connected with a second confluence piece, a second outgoing line is connected to the second confluence piece, and a gap exists between the first confluence piece and the third elastic probe module.

Further, the length of the third elastic probe module is greater than that of the second elastic probe module, the first confluence piece and the second confluence piece are sheet-shaped, and the first confluence piece and the second confluence piece are parallel to each other.

Still further, the first bus bar has a bending portion, and the gap exists between the bending portion and the third elastic probe module.

Still further, an insulating sleeve is sleeved on the third elastic probe module, and the insulating sleeve is used for filling the gap.

Still further, the second elastic probe module is connected with the insulating piece on the third elastic probe module, the front of insulating piece with the second elastic probe module is connected, the back of insulating piece with the third elastic probe module is connected, the insulating piece is used for filling the clearance.

Further, the second elastic probe modules and the third elastic probe modules are alternately and sequentially arranged and have the same mutual distance, and the number of the upper probe modules is larger than that of the lower probe modules.

Further, one end of the first elastic probe module, which is far away from the battery to be tested, is connected with a first confluence piece, and a third outgoing line is connected to the first confluence piece.

Further, the upper bracket and the lower bracket are both U-shaped, and protruding parts are arranged on the upper bracket and the lower bracket in the direction close to the battery to be tested.

Further, a first fixing hole and a second fixing hole are formed in two sides of the upper support, and the shapes of the first fixing hole and the second fixing hole are different.

Further, the second elastic probe module comprises a probe sleeve and an elastic probe, the probe sleeve is fixed on the lower bracket, the elastic probe is detachably connected with the probe sleeve, and one end, far away from a battery to be tested, of the probe sleeve is connected with the first confluence piece.

Compared with the prior art, the utility model has the beneficial effects that: by utilizing the elastic probe to contact the front side and the back side of the MWT battery, the EL test of the component end can be simulated, and meanwhile, hidden cracks and fragments of the tested battery are not easy to cause.

Drawings

FIG. 1 is a schematic view of the structure of a photovoltaic cell EL test probe row of the present utility model;

FIG. 2 is a schematic view of a first bussing member connection of the present utility model;

FIG. 3 is a schematic view of the structure of a fourth embodiment of the present utility model;

fig. 4 is a schematic structural view of a fifth embodiment of the present utility model;

fig. 5 is an enlarged view of a portion a in fig. 4.

In the figure:

1 a-upper rack; 1 b-a lower rack; 2 a-a first elastic probe module; 2 b-a second elastic probe module; 2 c-a third elastic probe module; 3 a-a first manifold; 3 b-a second bus bar; 3 c-a third manifold; 4 a-a first lead-out wire; 4 b-a second lead-out wire; 4 c-a third lead-out wire; 5-bending part; 6-insulating sleeve; 7-insulating sheets; 8 a-probe sleeve; 8 b-elastic probe; 9-a boss; 10 a-a first fixing hole; 10 b-a second fixing hole; 11-battery under test.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Embodiment one:

as shown in fig. 1 and 2, the photovoltaic cell EL test probe row of the present utility model includes an upper bracket 1a and a lower bracket 1b, where the upper bracket 1a and the lower bracket 1b are both made of insulating materials. During testing, the battery 11 to be tested is placed between the upper bracket 1a and the lower bracket 1b, and the battery 11 to be tested is a battery sample tested by using the test probe row of the utility model. An upper probe module is fixed on the upper bracket 1a, and a lower probe module is fixed in the lower bracket 1 b. The upper probe module comprises a plurality of first elastic probe modules 2a, and the lower probe module comprises a plurality of second elastic probe modules 2b and third elastic probe modules 2c. The second elastic probe modules 2b and the third elastic probe modules 2c are arranged side by side, and for better EL test effect, the second elastic probe modules 2b and the third elastic probe modules 2c are alternately arranged in sequence and have the same mutual distance, and the number of the first elastic probe modules 2a is greater than the sum of the numbers of the second elastic probe modules 2b and the third elastic probe modules 2c, that is, the number of the upper probe modules is greater than the number of the lower probe modules. The end of the second elastic probe module 2b far away from the battery 11 to be tested is connected with a first bus bar 3a, and the first bus bar 3a is connected with a first outgoing line 4a. The end of the third elastic probe module 2c far away from the battery 11 to be tested is connected with a second bus bar 3b, and the second bus bar 3b is connected with a second outgoing line 4b. The length of the third elastic probe module 2c is greater than that of the second elastic probe module 2b, the first confluence piece 3a and the second confluence piece 3b are sheet-shaped, and the first confluence piece 3a and the second confluence piece 3b are parallel to each other. The first bus bar 3a has a straight portion connected to the second elastic probe module 2b and a bent portion 5, and a gap exists between the bent portion 5 and the third elastic probe module 2c. The third elastic probe module 2c may be sleeved with an insulating sleeve 6, and the insulating sleeve 6 is used for filling the gap. The photovoltaic cell EL test probe row of the embodiment is mainly used for MWT cell EL test. During testing, the upper probe module and the lower probe module are used for jointly extruding a battery to be tested during testing, the upper probe module is not electrified, only plays a role in supporting and extruding, and the second elastic probe module 2b and the third elastic probe module 2c in the lower probe module are electrified and form a loop with the battery to be tested. Through setting up more upper probe module, simulated the subassembly EL end test of MWT battery, and owing to adopted elasticity probe module and the battery contact of being surveyed, the elasticity of probe makes difficult to cause hidden crack and piece to the battery of being surveyed. Meanwhile, as the first confluence part and the second confluence part are arranged at one end far away from the battery to be tested, the length of the probe extending out of the support can be shorter, and the deformation of the probe is smaller when the probe is in extrusion contact with the battery to be tested during EL test, so that the reliability of the probe is improved.

Embodiment two:

the difference between this embodiment and the first embodiment is that the insulating bush 6 is not provided, and the first bus bar 3a is a wire, and the wire is in a W shape, so that a gap exists between the first bus bar 3a and the third elastic probe module 2c.

Embodiment III:

this embodiment differs from the first embodiment in that the first busbar 3a is not provided with the bent portion 5, but is a metal sheet having elasticity, which is connected to the second elastic probe module 2b and is in contact with the insulating sheath 6.

Embodiment four:

as shown in fig. 3, this embodiment differs from the first embodiment in that the first bus bar 3a is not provided with the bent portion 5, the third elastic probe module 2c is not sleeved with an insulating sleeve 6, the second elastic probe module 2b and the third elastic probe module 2c are connected with an insulating sheet 7, the front surface of the insulating sheet 7 is connected with the second elastic probe module 2b, and the back surface of the insulating sheet 7 is connected with the third elastic probe module 2c. The first bus member is also a metal sheet with elasticity. The metal sheet is connected to the second elastic probe module 2b and is in contact with the insulating sheet 7. The insulating sheet 7 is used to fill the gap between the first bus bar 3a and the third elastic probe module 2c.

Fifth embodiment:

as shown in fig. 4, when the EL test is required for the conventional photovoltaic cell (i.e., the positive and negative electrodes of the cell are on both sides of the cell), the end of the first elastic probe module 2a far from the tested cell 11 is connected to the first bus member 3c, and the third lead wire 4c is connected to the first bus member 3 c. And, the number of upper probe modules need not be greater than the number of lower probe modules. When the EL test is performed, the upper probe module and the lower probe module are electrified, and the upper probe module, the tested battery and the lower probe module form a loop. The EL test probe row of the photovoltaic cell has good expansibility, and can carry out EL test on the conventional photovoltaic cell with little change.

In addition, as shown in fig. 4, in any of the photovoltaic cell EL test probe rows of the first to fifth embodiments, the upper bracket 1a and the lower bracket 1b may each have a U shape, and the upper bracket 1a and the lower bracket 1b are each provided with a protruding portion 9 in a direction approaching the battery 11 to be tested. Through the design of protruding portion, be convenient for probe and the battery contact of being surveyed. Meanwhile, a first fixing hole 10a and a second fixing hole 10b are provided at both sides of the upper bracket 1a, and the shapes of the first fixing hole 10a and the second fixing hole 10b are different. For example: the first fixing hole 10a may be a circular hole and the second fixing hole 10b may be a waist hole. The first fixing hole 10a and the second fixing hole 10b are all mounting holes of the bracket, and by distinguishing the shapes of the mounting holes, a better foolproof effect can be realized, and assembly errors are reduced.

Also, as shown in fig. 5, in the photovoltaic cell EL test probe row of any one of the first to fifth embodiments, the first elastic probe module 2a, the second elastic probe module 2b, and the third elastic probe module 2c may each have a probe sleeve and probe structure. Taking a second elastic probe module as an example, the second elastic probe module 2b includes a probe sleeve 8a and an elastic probe 8b, the probe sleeve 8a is fixed on the lower bracket 1b, the elastic probe 8b is detachably connected with the probe sleeve 8a, and one end of the probe sleeve 8a far away from the battery 11 to be tested is connected with the first bus bar 3 a. Because the probe is the wearing part, the probe sleeve is convenient to replace. Meanwhile, a locking structure can be arranged in the probe sleeve, and the probe needs to be pulled out with force when the probe is taken out, so that the probe is not easy to slide out of the probe sleeve after being inserted into the probe sleeve.

In summary, according to the photovoltaic cell EL test probe row provided by the utility model, the component EL end test of the MWT cell is simulated by arranging more upper probe modules, and the elastic probe modules are adopted to contact with the tested cell, so that the elastic probe is not easy to cause hidden cracks and fragments on the tested cell. Meanwhile, as the first confluence part and the second confluence part are arranged at one end far away from the battery to be tested, the length of the probe extending out of the support is shorter, and the deformation of the probe is smaller when the probe is in extrusion contact with the battery to be tested during EL test, so that the reliability of the probe is improved. And moreover, the EL test of the conventional battery can be realized only by connecting the first confluence part at one end of the first elastic probe module, which is far away from the battery to be tested, and the expansibility is good. And through the design of protruding portion, be convenient for probe and the battery contact of being surveyed. Through distinguishing the shape of the mounting hole, a better fool-proof effect can be realized, and assembly errors are reduced. Through the arrangement of the probe sleeve, the probe is not easy to slide out of the probe sleeve after being inserted into the probe sleeve.

It is emphasized that: the above embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims (10)

1. The utility model provides a photovoltaic cell EL surveys probe row, includes upper bracket (1 a) and lower carriage (1 b), upper bracket (1 a) with lower carriage (1 b) are insulating material, be fixed with the probe module in upper bracket (1 a), be fixed with down the probe module in lower carriage (1 b), the probe module includes first elasticity probe module (2 a), the probe module includes second elasticity probe module (2 b) and third elasticity probe module (2 c), its characterized in that down: the first elastic probe module (2 a), the second elastic probe module (2 b) and the third elastic probe module (2 c) are respectively provided with at least one, the second elastic probe module (2 b) and the third elastic probe module (2 c) are arranged side by side, one end, far away from a battery (11) to be tested, of the second elastic probe module (2 b) is connected with a first confluence piece (3 a), and the first confluence piece (3 a) is connected with a first outgoing line (4 a); one end of the third elastic probe module (2 c) far away from the battery (11) to be tested is connected with a second bus-bar (3 b), the second bus-bar (3 b) is connected with a second outgoing line (4 b), and a gap exists between the first bus-bar (3 a) and the third elastic probe module (2 c).

2. The photovoltaic cell EL test probe row of claim 1, wherein: the length of the third elastic probe module (2 c) is greater than that of the second elastic probe module (2 b), the first confluence piece (3 a) and the second confluence piece (3 b) are sheet-shaped, and the first confluence piece (3 a) and the second confluence piece (3 b) are parallel to each other.

3. The photovoltaic cell EL test probe row of claim 2, wherein: the first confluence piece (3 a) is provided with a bending part (5), and the gap exists between the bending part (5) and the third elastic probe module (2 c).

4. The photovoltaic cell EL test probe row of claim 2, wherein: and the third elastic probe module (2 c) is sleeved with an insulating sleeve (6), and the insulating sleeve (6) is used for filling the gap.

5. The photovoltaic cell EL test probe row of claim 2, wherein: the second elastic probe module (2 b) and the third elastic probe module (2 c) are connected with an insulating sheet (7), the front surface of the insulating sheet (7) is connected with the second elastic probe module (2 b), the back surface of the insulating sheet (7) is connected with the third elastic probe module (2 c), and the insulating sheet (7) is used for filling the gap.

6. The photovoltaic cell EL test probe row of claim 1, wherein: the second elastic probe modules (2 b) and the third elastic probe modules (2 c) are alternately and sequentially arranged and have the same mutual distance, and the number of the upper probe modules is larger than that of the lower probe modules.

7. The photovoltaic cell EL test probe row of claim 1, wherein: one end of the first elastic probe module (2 a) far away from the battery (11) to be tested is connected with a third bus bar (3 c), and the third bus bar (3 c) is connected with a third outgoing line (4 c).

8. The photovoltaic cell EL test probe row of claim 1, wherein: the upper support (1 a) and the lower support (1 b) are U-shaped, and protruding portions (9) are arranged in the directions of the upper support (1 a) and the lower support (1 b) close to the battery (11) to be tested.

9. The photovoltaic cell EL test probe row of claim 1, wherein: the two sides of the upper bracket (1 a) are provided with a first fixing hole (10 a) and a second fixing hole (10 b), and the shapes of the first fixing hole (10 a) and the second fixing hole (10 b) are different.

10. The photovoltaic cell EL test probe row of claim 1, wherein: the second elastic probe module (2 b) comprises a probe sleeve (8 a) and an elastic probe (8 b), the probe sleeve (8 a) is fixed on the lower bracket (1 b), the elastic probe (8 b) is detachably connected with the probe sleeve (8 a), and one end, far away from a battery (11) to be tested, of the probe sleeve (8 a) is connected with the first confluence piece (3 a).

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