CN210380767U

CN210380767U - Solar cell testing device

Info

Publication number: CN210380767U
Application number: CN201921746042.4U
Authority: CN
Inventors: 周平; 崔巍
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-04-21
Anticipated expiration: 2029-10-17

Abstract

The utility model belongs to the technical field of solar cell, a solar cell testing arrangement is disclosed, it includes ohmmeter, accredited testing organization and test platform, accredited testing organization includes at least one test element, test element is including the first probe and the second probe that set up side by side, first probe sets up with the back silver thick liquid of being tested solar cell relatively, the second probe sets up with the back aluminium thick liquid of back silver thick liquid next-door neighbour relatively. The utility model provides a solar cell testing arrangement can test the back silver thick liquid at the solar cell back and accomplish and the resistance between the back aluminium thick liquid to be convenient for assess the back silver thick liquid and around the contact performance between the back aluminium thick liquid.

Description

Solar cell testing device

Technical Field

The utility model relates to a solar cell technical field especially relates to a solar cell testing arrangement.

Background

Referring to fig. 1, two conductive pastes, namely a back silver paste 101 serving as an electrode and a back aluminum paste 102 constituting a main grid, are required for back pattern printing of a crystalline silicon solar cell 100. Like the front silver paste of the solar cell 100, the back silver paste 101 is also screen printed on the back of the cell to meet the requirement of large-scale industrial production, and the back silver paste 101 is fused with the back aluminum paste 102 after sintering. For the laminated cell, the back silver paste 101 and the back aluminum paste 102 need to have good matching performance, so that the back silver paste 101 and the back aluminum paste 102 have proper series resistance, and therefore, the flowing effect of current between the small cells after the small cells are laminated is met, and the photoelectric conversion efficiency is ensured.

In large-scale printing and sintering production operations, it is difficult to ensure that the contact performance between the back silver paste 101 and the back aluminum paste 102 of all the produced solar cells 100 can meet the design standard, and at present, no testing device capable of testing the contact resistance between the back silver paste 101 and the back aluminum paste 102 of the solar cells to evaluate the contact performance between the back silver paste 101 and the back aluminum paste 102 exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a solar cell testing arrangement, it can test the contact resistance between solar cell's back silver thick liquid and the back aluminium thick liquid.

To achieve the purpose, the utility model adopts the following technical proposal: the utility model provides a solar cell testing arrangement for contact resistance between test solar cell's back silver thick liquid and the back aluminium thick liquid, it includes ohmmeter, accredited testing organization and is used for placing the test platform who is tested solar cell, accredited testing organization include at least one with ohmmeter electric connection's test unit, test unit includes first probe and the second probe that sets up side by side along the extending direction of the main grid of being surveyed solar cell, first probe sets up with the back silver thick liquid of being tested solar cell relatively, the second probe sets up with the back aluminium thick liquid of back silver thick liquid next-door neighbour relatively.

Preferably, the number of the test units included in the test mechanism is equal to the number of the main grids of the solar cell to be tested.

Preferably, the solar cell testing device comprises a plurality of testing mechanisms, the number of the testing mechanisms is equal to the number of the back silver pastes on the main grid of the solar cell to be tested, and the testing mechanisms are arranged at intervals along the direction perpendicular to the extending direction of the main grid of the solar cell to be tested.

Preferably, the distance between any two adjacent testing mechanisms is equal to the distance between two adjacent back silver pastes on the same main grid of the solar cell to be tested.

Preferably, the number of the test units included in the test mechanism is equal to the number of the back silver paste on the main grid of the solar cell to be tested.

Preferably, the solar cell testing device comprises a plurality of testing mechanisms, the number of the testing mechanisms is equal to the number of the main grids of the solar cell to be tested, and the plurality of testing mechanisms are arranged at intervals along the direction parallel to the extending direction of the main grids of the solar cell to be tested.

Preferably, the distance between any two adjacent testing mechanisms is equal to the distance between two adjacent main grids of the tested solar cell.

Preferably, the testing mechanism comprises a plurality of testing units, and the plurality of testing units are fixedly connected with the same probe row.

Preferably, the ohmmeter is a multi-channel milliohmmeter, and the number of channels of the multi-channel milliohmmeter is greater than or equal to the sum of the number of test units included in all the test mechanisms.

Preferably, the solar cell testing device further comprises a driving mechanism for driving the testing mechanism to move in a direction towards or away from the testing platform.

The utility model has the advantages that:

1. the utility model provides a solar cell testing arrangement can test solar cell's back silver thick liquid and accomplish and the resistance between the back aluminium thick liquid to be convenient for assess the back silver thick liquid rather than the contact performance between the back aluminium thick liquid on every side, and then can assess solar cell at the potential contact problem between whole piece stage silver, the aluminium thick liquid, be suitable for the adjustment and the improvement of carrying out battery piece production technology, greatly reduced the bad and subassembly reliability risk in the battery manufacturing process.

2. The utility model provides a solar cell testing arrangement still is applicable to the sorting operation of the problem piece of whole piece battery.

Drawings

FIG. 1 is a schematic diagram of a backside structure of a solar cell;

fig. 2 is a front view of a solar cell testing apparatus in an embodiment of the present invention;

fig. 3 is a top view of a solar cell testing apparatus in an embodiment of the invention (with ohmmeter hidden);

fig. 4 is a schematic view of a test contact position between a test unit of any test mechanism of the solar cell test apparatus and a solar cell under test in the embodiment of the present invention;

fig. 5 is a top view of a solar cell testing apparatus in an alternative embodiment of the present invention (ohmmeter hidden);

fig. 6 is a schematic view of a test contact position between a test unit of any test mechanism of the solar cell testing apparatus and a solar cell to be tested according to the alternative embodiment of the present invention.

In the figure:

100. a solar cell; 101. back silver paste; 102. back aluminum paste;

1. a test platform; 2. an ohm meter; 3. a testing mechanism; 31. a test unit; 311. a first probe; 312. a second probe; 32. and (4) probe rows.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a solar cell testing device for testing the contact resistance between the back side silver paste 101 and the back side aluminum paste 102 of the solar cell 100. Referring to fig. 2, the solar cell testing apparatus includes a testing platform 1 capable of placing a solar cell 100 to be tested, an ohmmeter 2 capable of reading a contact resistance between a back silver paste 101 and a back aluminum paste 102 of the solar cell 100, and a testing mechanism 3 capable of shorting the back silver paste 101 and the back aluminum paste 102 of the solar cell 100 to a testing loop of the ohmmeter 2. The testing mechanism 3 comprises at least one testing unit 31 electrically connected with the ohmmeter 2, and the testing unit 31 comprises a first probe 311 and a second probe 312 which are arranged in parallel along the extending direction of the main grid of the solar cell to be tested. The first probe 311 is electrically connected to one of the two testing terminals of the ohmmeter 2, and is disposed opposite to the back silver paste 101 of the solar cell 100 to be tested. The second probe 312 is electrically connected to the other of the two testing terminals of the ohmmeter 2, and is disposed opposite to the back aluminum paste 102 adjacent to the back silver paste 101 opposite to the first probe 311.

When the first probe 311 and the second probe 312 are respectively abutted against the back silver paste 101 and the back aluminum paste 102, the back silver paste 101 and the back aluminum paste 102 which are in fusion bonding are connected in series to a test loop of the ohmmeter 2, and a resistance value between the tested back silver paste 101 and the surrounding back aluminum paste 102 on the back of the solar cell 100 can be obtained through a test value of the ohmmeter 2, so that the contact performance between the back silver paste 101 and the surrounding back aluminum paste 102 is evaluated, if the resistance value is smaller than a maximum allowable resistance value, the fusion bonding between the back silver paste 101 and the surrounding back aluminum paste 102 is better, otherwise, the fusion bonding between the back silver paste 101 and the surrounding back aluminum paste 102 is not good. Moreover, after resistance tests between all back silver pastes 101 on the back of the solar cell 100 and the back aluminum pastes 102 are completed, the contact performance between the back silver pastes 101 and the surrounding back aluminum pastes 102 in each area of the whole cell can be evaluated, the potential contact problem between the back silver pastes 101 and the back aluminum pastes 102 of the solar cell 100 in the whole stage can be further evaluated, the result is fed back to the working sections of upstream printing, sintering and the like for process adjustment and improvement, and the defects and the assembly reliability risks in the cell manufacturing process are greatly reduced. The solar cell testing device is also suitable for sorting operation of defective cells of the whole cell.

As shown in fig. 1, the number of the main grids on the monolithic solar cell 100 is generally 4 to 10, and the number of the back silver paste 101 on any main grid is generally 4 to 20, depending on the cell design. In order to be suitable for quickly testing the contact performance between all the back side silver pastes 101 and the surrounding back side aluminum pastes 102 of the battery piece, please refer to fig. 2, 3 and 4, in the present embodiment, the testing mechanism 3 includes the same number of testing units 31 as the number of the main grids of the solar cell 100 to be tested, so that during the testing operation, each test unit 31 of the test mechanism 3 can measure the resistance of one back silver paste 101 on all main gates of the solar cell 100 to be tested and the resistance of the back aluminum paste 102 around the back silver paste 101 at the same time (in fig. 4, any pair of adjacent two circles are the test contact points between the first probe and the second probe of the test unit and the solar cell to be tested, respectively, and all circles constitute the test contact points between all test units of one test mechanism and the solar cell to be tested in this embodiment).

Further, with continuing reference to fig. 2, fig. 3 and fig. 4, the solar cell testing apparatus further includes a plurality of testing mechanisms 3, the number of the testing mechanisms 3 is equal to the number of the back silver pastes 101 on the main grid of the solar cell 100 to be tested, and the plurality of testing mechanisms 3 are arranged at intervals along a direction perpendicular to the extending direction of the main grid of the solar cell 100 to be tested. Therefore, during the test operation, each test unit 31 of the test mechanism 3 can simultaneously measure the resistance of all the back silver pastes 101 on all the main grids of the solar cell 100 to be tested and the resistance of the back aluminum pastes 102 around all the back silver pastes 101, and the test of the whole solar cell 100 can be completed by one operation, thereby greatly improving the efficiency of the test operation.

Because the back silver thick liquid 101 on each main grid on same piece of solar cell 100 is regular array form distribution, consequently each accredited testing organization 3 of this solar cell testing arrangement can arrange with the main grid of battery piece vertically equidistance, and arbitrary adjacent two accredited testing organization 3's interval can be equal with the interval of being tested two adjacent back silver thick liquid 101 on the same main grid of solar cell 100. Similarly, the pitch between the test units 31 of each test mechanism 3 is equal to the pitch of the main grid of the cell. To ensure the accuracy of the test sites, a plurality of test units 31 may be fixedly connected to the same probe bank 32.

Referring to fig. 2, fig. 5 and fig. 6, in an alternative embodiment, for the purpose of completing the test of the entire solar cell 100 by one operation, the number of the test units 31 included in the test mechanism 3 may also be equal to the number of the back silver paste 101 on the main grid of the solar cell 100 to be tested (in fig. 6, any pair of adjacent two circles are the test contact points between the first probe and the second probe of the test unit and the solar cell to be tested, respectively, and all circles constitute the test contact points between all the test units of one test mechanism and the solar cell to be tested in the alternative embodiment). The number of the testing mechanisms 3 is equal to the number of the main grids of the solar cell 100 to be tested, and a plurality of the testing mechanisms 3 are arranged at intervals along a direction parallel to the extending direction of the main grids of the solar cell 100 to be tested. This structure can also have the same number of test cells 31 as the back silver paste 101 of the entire solar cell 100, and thus has the same test efficiency as the above design. Accordingly, the pitch of any two adjacent testing mechanisms 3 may be equal to the pitch of two adjacent main grids of the tested solar cell 100, and a plurality of testing mechanisms 3 are arranged at intervals along the direction parallel to the extending direction of the main grids of the tested solar cell 100.

In addition, due to the above structural design suitable for testing the whole solar cell 100 at one time, the ohmmeter 2 can be a multi-channel milliohmmeter, and the number of channels of the multi-channel milliohmmeter is greater than or equal to the sum of the number of the test units 31 included in all the test mechanisms 3, so as to meet the use requirement of the test operation. The solar cell testing device can also comprise a driving mechanism for driving the testing mechanism 3 to move in the direction towards or away from the testing platform 1, and the action of the driving mechanism is electrically controlled by a control device so as to replace manual work.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a solar cell testing arrangement for contact resistance between test solar cell's back silver thick liquid (101) and back aluminium thick liquid (102), its characterized in that, including ohmmeter (2), accredited testing organization (3) and be used for placing test platform (1) by test solar cell (100), accredited testing organization (3) include at least one with ohmmeter (2) electric connection's test unit (31), test unit (31) include along the extending direction of the main grid of being surveyed solar cell (100) first probe (311) and second probe (312) that set up side by side, first probe (311) and the back silver thick liquid (101) of being surveyed solar cell (100) set up relatively, second probe (312) with back aluminium thick liquid (102) of back silver thick liquid (101) next-door neighbour set up relatively.

2. Solar cell testing device according to claim 1, characterized in that the testing mechanism (3) comprises the same number of testing units (31) as the number of main grids of the solar cell (100) under test.

3. The solar cell testing device according to claim 2, wherein the testing mechanism (3) is provided in plurality, and the testing mechanisms (3) are arranged at intervals along a direction perpendicular to the extending direction of the main grid of the solar cell (100) to be tested, and the number of the testing mechanisms (3) is equal to the number of the back silver pastes (101) on the main grid of the solar cell (100) to be tested.

4. The solar cell testing device according to claim 3, wherein the distance between any two adjacent testing mechanisms (3) is equal to the distance between two adjacent back silver pastes (101) on the same main grid of the solar cell (100) to be tested.

5. The solar cell testing apparatus according to claim 1, wherein the testing mechanism (3) comprises the same number of testing units (31) as the number of back silver pastes (101) on the main grid of the solar cell (100) to be tested.

6. The solar cell testing device according to claim 5, wherein the testing mechanism (3) is a plurality of testing mechanisms, and the plurality of testing mechanisms (3) are arranged at intervals along a direction parallel to the extending direction of the main grids of the solar cell (100) to be tested, and the number of the testing mechanisms (3) is equal to the number of the main grids of the solar cell (100) to be tested.

7. The solar cell testing device according to claim 6, wherein the spacing between any two adjacent testing mechanisms (3) is equal to the spacing between two adjacent main grids of the solar cell (100) to be tested.

8. The solar cell testing device according to claim 1, characterized in that the testing mechanism (3) comprises a plurality of the testing units (31), a plurality of the testing units (31) being fixedly connected to one and the same probe bank (32).

9. Solar cell testing device according to claim 1, characterized in that the ohmmeter (2) is a multi-channel milliohmmeter having a number of channels greater than or equal to the sum of the number of test units (31) comprised by all the testing mechanisms (3).

10. Solar cell testing device according to claim 1, characterized in that it further comprises a driving mechanism for driving the testing mechanism (3) in a direction towards or away from the testing platform (1).