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A method for testing the reliability of battery metal electrodes and welding strips after welding

A test method and battery electrode technology, which is applied in the field of solar cell technology, can solve problems such as defects, affecting the performance of solar modules, stripping of solder strips and battery electrodes, etc.

Active Publication Date: 2020-10-23
SUZHOU TALESUN SOLAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned prior art, the welding tension of battery electrodes is tested at normal temperature, but solar modules often experience high temperature, exposure to sunlight, etc. As time goes by, the harsh external environment will cause the battery to age continuously, and the battery electrodes and welding Whether the connection between the ribbons is reliable and whether it will not be peeled off is not considered in the current prior art. It is easy to peel off between the solder ribbons and the battery electrodes, which will cause poor EL and other phenomena, which seriously affects solar modules. performance

Method used

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  • A method for testing the reliability of battery metal electrodes and welding strips after welding
  • A method for testing the reliability of battery metal electrodes and welding strips after welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 A test method for the reliability of battery metal electrodes and welding strips after welding

[0029] (1) The bare electrode of the battery is welded with ribbon;

[0030] (2) The cell is tested in a thermal cycle box, and the thermal cycle condition is

[0031] time temperature(℃) 0-15min -40℃ 15min-1h -40℃～20℃ 1h-2h 20℃～80℃ 2h-2h15min 80℃ 2h15min-3h 80℃～20℃ 3h-4h 20℃～-40℃

[0032] A total of 5 cycles;

[0033] (3) After the thermal cycle is completed, the tensile force between the battery electrode and the welding strip is tested again, which is 93% of the tensile force of the battery sheet that has not been subjected to the thermal cycle test.

[0034] Among them, in step (1), the electrode of the battery bare chip adopts a hollowed-out through-type busbar, and the hollowed out pattern is linear, see the attached figure 1 .

[0035] When testing the tensile force, fix the battery sheet in the slot 2 ...

Embodiment 2

[0036] Example 2 A test method for the reliability of battery metal electrodes and welding strips after welding

[0037] (1) The bare electrode of the battery is welded with ribbon;

[0038] (2) The cell is tested in a thermal cycle box, and the thermal cycle condition is

[0039] time temperature(℃) 0-0.5h -38℃ 0.5h-1.5h -38℃～22℃ 1.5h-2.5h 22℃～82℃ 2.5h-3min 82℃ 3h-4h 82℃～22℃ 4h-5h 22℃～-38℃

[0040] A total of 10 cycles;

[0041] (3) After the thermal cycle is completed, the tensile force between the battery electrode and the welding strip is tested again, which is 97.9% of the tensile force of the battery sheet without thermal cycle test.

[0042] Wherein, in the step (1), the electrode of the battery bare chip adopts a hollowed-out through-type busbar, and the hollowed out pattern is a rhombus.

[0043] When testing the tensile force, fix the battery sheet in the slot 2 of the tensile tester and press it with the pressure...

Embodiment 3

[0044] Example 3 A test method for the reliability of battery metal electrodes and welding strips after welding

[0045] (1) The bare electrode of the battery is welded with ribbon;

[0046] (2) The cell is tested in a thermal cycle box, and the thermal cycle condition is

[0047] time temperature(℃) 0-10min -42℃ 10min-30min -42℃～-10℃ 30min-1h -10℃～20℃ 1h-2h 20℃～80℃ 2h-2h10min 80℃ 2h10min-2.5h 80℃～50℃ 2.5h-3h 50-10℃ 3h-4h 10℃～-42℃

[0048] A total of 7 cycles;

[0049] (3) After the thermal cycle is completed, the tensile force between the battery electrode and the welding strip is tested again, which is 89.0% of the tensile force of the battery sheet without thermal cycle test.

[0050] Wherein, in step (1), the electrode of the battery bare chip adopts a hollowed-out through-type busbar, and the hollowed out pattern is circular.

[0051] When testing the tensile force, fix the battery sheet in the slot 2 of t...

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PUM

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Abstract

The invention provides a testing method for the reliability after welding of a battery metal electrode and a welding strip. A test for a pulling-out force between the electrode and the welding strip is increased after a heat cycle, so as to effectively ensure that a battery piece still can have good performance after the heat cycle of the battery piece; a condition that a peeling phenomenon between the welding strip and the battery piece occurs in a post-period utilization process, resulting in an EL failure is avoided. By adopting the method provided by the invention, whether a welding forcebetween the battery electrode and the welding strip is qualified or not can be found; defective products are prevented from flowing into the downstream at a battery end in advance; the problem that low-quality products are used so that the service life of the products is reduced is avoided and the risks and cost are reduced from the source.

Description

technical field [0001] The invention relates to the field of solar cell technology, in particular to a method for testing the reliability of solar cell metal electrodes and welding strips after welding. Background technique [0002] With the development of society, as the basic material condition for the operation and development of human society - the consumption of energy in the past 100 years is obvious to all. The contradiction between the limitation of non-renewable traditional fossil energy reserves in a short period of time and the ever-increasing energy demand for the development of human society is intensifying day by day. Therefore, in order for human society to achieve the goal of sustainable development, it is necessary to increase the development and utilization of renewable energy. As an important form of solar energy application, solar photovoltaic power generation is sustainable and non-polluting. Its role in industrial production and scientific and technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/66
CPCH01L22/12
Inventor 苗凤秀张树德胡党平
Owner SUZHOU TALESUN SOLAR TECH CO LTD
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