A fixture for EL testing

Abstract

This invention provides an EL testing fixture, belonging to the field of photovoltaic module testing technology. It solves the problem of current EL testing methods that can crush solar panels. This EL testing fixture includes an insulating cylinder, with conductive sheets fitted on both sides of the cylinder. The bottom ends of the conductive sheets extend radially beyond the bottom of the insulating cylinder, and the top ends of the conductive sheets are folded over and overlapped with their bottom ends. This invention has a simple structure, will not crush the solar panels, and offers high testing efficiency and a high yield rate.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic module testing technology, and relates to an EL testing fixture. Background Technology

[0002] EL testing is a core technology in the photovoltaic industry for detecting internal defects in solar cells. Its principle is to apply a forward bias voltage to the solar cell, causing electrons and holes to recombine and release energy, which is then radiated out in the form of light. A high-sensitivity camera then captures the luminescent image, thus providing a direct reflection of the internal quality of the solar cell.

[0003] Currently, when performing EL testing on solar cells, paperclips are typically used to hold the two electrode plates of the solar panel, with a shim between the electrode plates and the panel surface. In actual operation, because the force application point of the paperclip is small, it is very easy to cause localized concentrated stress on the solar panel when pressure is applied, which can lead to the solar panel being crushed. This not only affects the yield of solar panels and increases production costs, but also delays the production schedule. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing an EL testing fixture that will not crush the solar panel.

[0005] The purpose of this utility model can be achieved through the following technical solution: an EL testing fixture, including an insulating cylinder, wherein conductive sheets are sleeved on both the left and right sides of the insulating cylinder, the bottom end of the conductive sheet extends radially out of the bottom of the insulating cylinder, and the top end of the conductive sheet is folded over and overlapped on its bottom end.

[0006] When using this EL testing fixture, if the distance between the two electrode plates of the solar panel is small, the bottom ends of the two conductive plates are pressed onto the corresponding electrode plates, and then the two test terminals are pressed onto the top ends of the corresponding conductive plates. The conductive plates conduct electricity, facilitating testing. If the distance between the two electrode plates of the solar panel is large, the two electrode plates are sandwiched between the top and bottom ends of the corresponding conductive plates, and the two test terminals are pressed onto the top ends of the corresponding conductive plates. The conductive plates conduct electricity, facilitating testing. Because the bottom end of the conductive plate is flat, it will not crush the solar panel, ensuring testing efficiency, high yield, and reduced manufacturing costs.

[0007] In the aforementioned EL testing fixture, each of the outer walls of the insulating cylinder has two vertically extending limiting plates. The conductive strip located on the outer wall of the insulating cylinder is held by the corresponding two limiting plates. The limiting plates limit the conductive strip, ensuring good structural stability, preventing the conductive strip from shifting, and guaranteeing testing accuracy.

[0008] In the aforementioned EL testing fixture, both limiting plates on the same side are fixedly connected to horizontally arranged support plates. These support plates act as a barrier, preventing the conductive sheets from warping after prolonged use and extending their service life.

[0009] In the aforementioned EL testing fixture, the bottom of the insulating cylinder has symmetrical and radially extending support plates. By setting the support plates, the insulating cylinder can be auxiliaryly supported during the test, preventing it from tipping over and facilitating the inspection.

[0010] In the aforementioned EL testing fixture, angular reinforcing ribs are provided between the outer wall of the insulating cylinder and the support plate. By setting the angular reinforcing ribs, the connection between the support plate and the insulating cylinder can be strengthened, ensuring structural strength and a long service life.

[0011] In the aforementioned EL testing fixture, rubber pads supporting the conductive sheet are adhered to both sides of the inner wall of the insulating cylinder. These rubber pads act as a buffer, reducing friction and collision between the conductive sheet and the insulating cylinder during operation. They also increase the stability of the conductive sheet installation, preventing it from shaking inside the insulating cylinder and ensuring testing accuracy.

[0012] Compared with existing technologies, the advantages of this EL testing fixture are: simple structure, convenient installation, no crushing of the solar panel, high testing efficiency, and guaranteed yield. Attached Figure Description

[0013] Figure 1 This is a 3D view of the EL testing fixture.

[0014] Figure 2 This is a three-dimensional sectional view of the insulating cylinder structure of the EL testing tooling.

[0015] Figure 3 This is a diagram showing the usage status of this EL testing fixture.

[0016] Figure 4 This is another usage state diagram of the EL testing fixture.

[0017] In the diagram, 1 is a rubber pad; 2 is an insulating cylinder; 3 is a conductive sheet; 4 is a limiting plate; 5 is a support plate; 6 is a support plate; and 7 is an angular reinforcing rib. Detailed Implementation

[0018] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0019] like Figure 1 , Figure 2 As shown, the EL test fixture includes an insulating cylinder 2, with conductive sheets 3 fitted on both the left and right sides of the insulating cylinder 2. The bottom end of the conductive sheet 3 extends radially out of the bottom of the insulating cylinder 2, and the top end of the conductive sheet 3 is folded over and overlapped on its bottom end.

[0020] To elaborate further, both sides of the outer wall of the insulating cylinder 2 have two vertically extending limiting plates 4, and the conductive sheet 3 located on the outer wall of the insulating cylinder 2 is clamped by the corresponding two limiting plates 4.

[0021] Both limiting plates 4 on the same side are fixedly connected to horizontally arranged support plates 5. The bottom of the insulating cylinder 2 has symmetrical and radially extended support plates 6. The surface of the conductive sheet 3 is provided with a tin-plated layer. Tin has good conductivity, which can ensure the conductivity of the conductive sheet 3. At the same time, the tin layer can protect the conductive sheet 3 from oxidation and extend its service life.

[0022] An angular reinforcing rib 7 is provided between the outer wall of the insulating cylinder 2 and the support plate 6. Rubber pads 1 supporting the conductive sheet 3 are bonded to both sides of the inner wall of the insulating cylinder 2.

[0023] like Figure 3 As shown, when using this EL testing fixture, if the distance between the two electrode plates of the solar panel is small, the bottom ends of the two conductive plates 3 are pressed onto the corresponding electrode plates, and then the two terminals for testing are pressed onto the top ends of the corresponding conductive plates 3. The conductive plates 3 are conductive, which facilitates testing.

[0024] like Figure 4 As shown, when this EL testing fixture is used, if the distance between the two electrode plates of the solar panel is large, the two electrode plates are clamped between the top and bottom of the corresponding conductive plate 3. The two test terminals are pressed against the top of the corresponding conductive plate 3, and the conductive plate 3 conducts electricity, which facilitates testing.

[0025] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A jig for EL testing comprising an insulating cylinder (2), characterized in that: The insulating cylinder (2) is fitted with conductive sheets (3) on both the left and right sides. The bottom end of the conductive sheet (3) extends radially out of the bottom of the insulating cylinder (2), and the top end of the conductive sheet (3) is folded over and overlapped at its bottom end.

2. The tooling for EL testing of claim 1, wherein, The insulating cylinder (2) has two vertically extending limiting plates (4) on both sides of its outer wall. The conductive sheet (3) located on the outer wall of the insulating cylinder (2) is clamped by the corresponding two limiting plates (4).

3. The EL test tooling of claim 2, wherein, Both limiting plates (4) on the same side are fixedly connected to horizontally arranged support plates (5).

4. The EL testing fixture according to claim 3, characterized in that, The bottom of the insulating cylinder (2) has a support plate (6) that is symmetrical front and back and extends radially outward.

5. The EL testing fixture according to claim 4, characterized in that, The outer wall of the insulating cylinder (2) and the support plate (6) are provided with angular reinforcing ribs (7).

6. The EL testing fixture according to claim 5, characterized in that, Both sides of the inner wall of the insulating cylinder (2) are bonded with rubber pads (1) that support the conductive sheet (3).

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