CN111640688A - Last electric contact mechanism among photovoltaic module cluster EL automated inspection - Google Patents

Abstract

The invention provides a power-on contact mechanism in the automatic detection of a photovoltaic module string EL, which belongs to the technical field of photovoltaic cell manufacturing. It includes two opposite electrode fixing frames, a plurality of independent electrodes are movably connected on the electrode fixing frames, and the electrodes can reciprocate along the vertical direction. The electrode of the invention has the effect of self-adaptive pressing, and ensures uniform electrification.

Description

A power-on contact mechanism in automatic detection of photovoltaic module string EL

technical field

The invention belongs to the technical field of photovoltaic cell manufacturing, and relates to a power-on contact mechanism in the automatic detection of a photovoltaic module string EL.

Background technique

In the current production process of photovoltaic cell modules, the first step is to automatically load a piece of cells on a stringer and then automatically weld them into a string. The number of cells in each string varies according to the module model, and most of them are 5 , 6, 10, 12 and other specifications. Before the large strings are welded into a string and enter the next lamination process, the quality of the string welding needs to be checked. At present, there is manual inspection of the appearance, and the internal defects need to be tested by EL before the lamination after the next process is completed, so the battery string cannot be found immediately. The internal problem of the string welding machine is increased, and the EL automatic detection of the battery string is added at the discharge position of the string welding machine, which can find the defects in the string welding process at the first time, remind and immediately improve the string welding quality of the string welding machine.

When each battery string comes to the detection station of the string EL camera, a constant current (such as 5A) of a set size should be applied to both ends of the battery string. The welding strips at both ends of the battery string, and it is necessary to ensure that each welding strip is in firm contact to ensure uniform energization. If the energization is uneven, it is easy to cause misjudgment.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems, and provide a power-on contact mechanism in the automatic detection of photovoltaic module strings EL.

To achieve the above object, the present invention has adopted the following technical solutions:

A power-on contact mechanism in the automatic detection of photovoltaic module strings EL, comprising two opposite electrode fixing frames, a plurality of independent electrodes are movably connected to the electrode fixing frames, and the electrodes can be vertically connected. Direction reciprocating movement.

Further, the number of electrodes on the electrode holder is the same as the number of welding ribbons at the end of the battery string to be detected.

Further, the electrode includes a high-temperature-resistant contact head for contacting the welding tape, and a metal terminal for electrical connection with a power source, the high-temperature-resistant contact head and the metal terminal are fixedly connected, and the metal The terminal post is movably connected with the electrode holder and can reciprocate along the vertical direction.

Further, the high temperature resistant contact head is a graphite spacer, and the metal terminal is a copper rod.

Further, the top of the graphite spacer is flat.

Further, the electrode fixing frame includes a base, and a guide block fixed on the base, the guide block corresponds to the electrode one-to-one, and the guide block has a through hole matching the shape and size of the metal terminal. The wiring post is inserted into the guide block and is movably connected with the guide block.

Further, the cross-sectional area of the high temperature-resistant contact head is larger than the cross-sectional area of the metal terminal, and an elastic member is provided between the high temperature-resistant contact head and the guide block.

Further, the elastic piece is sleeved on the metal terminal, and the two ends of the elastic piece are respectively in contact with the lower surface of the high temperature-resistant contact head and the upper surface of the guide block.

Further, the bottom of the metal terminal is provided with a limit block with a cross-sectional area larger than the through hole on the guide block, and the limit block is located below the guide block.

Further, a camera fixing frame is arranged under the electrode fixing frame, and a camera is arranged on the camera fixing frame.

Compared with the prior art, the advantages of the present invention are:

1. The electrode has an adaptive pressing effect to ensure uniform power supply.

2. The electrode is made of two materials, which is durable for a long time.

Other advantages, objects, and features of the present invention will appear in part from the description that follows, and in part will be appreciated by those skilled in the art from the study and practice of the invention.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the schematic diagram of Fig. 1 another direction;

Fig. 3 is the structural representation of electrode;

FIG. 4 is an enlarged view of part A in FIG. 1 .

In the figure: electrode holder 1, electrode 2, high temperature contact head 3, metal terminal 4, base 5, guide block 6, elastic piece 7, limit block 8, camera holder 9, camera 10, stringer machine Table traverse mechanism 11 , battery string 12 .

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

As shown in Figure 1-2, a power-on contact mechanism in the automatic detection of photovoltaic module strings EL includes two opposite electrode holders 1, and a plurality of independent electrodes are movably connected to the electrode holders 1. 2. The electrode 2 can reciprocate along the vertical direction. A camera holder 9 is arranged below the electrode holder 1 , and a camera 10 is arranged on the camera holder 9 .

Because the number of busbars of the battery sheets is different, the number of welding strips of the same battery string is also different. There are many, currently ranging from 5 to 10. In order to ensure that each one has good contact, this embodiment adopts Each electrode 2 is designed independently, and each electrode can reciprocate in the vertical direction to achieve adaptive compression with the welding strip, so as to achieve firm contact between the electrode and each welding strip, and ensure uniform power supply.

The number of electrodes 2 on the electrode holder 1 is the same as the number of welding ribbons at the end of the battery string to be detected. If there are 5 welding ribbons, 5 electrodes 2 are designed on each electrode holder 1.

Due to the change of the incoming material position of each string of battery strings, the tolerance of the welding tape, etc., the automatic contact part may have high temperature and ignition phenomenon at the moment of power-on, and the metal in the contact part may be ablated and damaged, so it is necessary to solve its long-term durability. question. As a preferred solution, in this embodiment, as shown in FIG. 3 , the electrode 2 includes a high-temperature-resistant contact head 3 for contacting the welding tape, and a metal terminal 4 for electrical connection with the power supply. The high temperature contact head 3 is fixedly connected with the metal terminal 4, and the metal terminal 4 is movably connected with the electrode holder 1 and can reciprocate along the vertical direction.

In this embodiment, the high temperature resistant contact head 3 is a graphite spacer, and the metal terminal 4 is a copper rod. The graphite material is resistant to high temperature, and the surface is easy to clean. The copper rod has good electrical performance, and the power cord and the copper rod can be firmly connected with screws.

Preferably, the top of the graphite spacer is flat, and the flat upper surface is easy to achieve sufficient contact with the welding strip.

The electrode holder 1 includes a base 5, and a guide block 6 fixed on the base 5. The guide block 6 corresponds to the electrode 2 one-to-one. The metal terminal 4 is inserted into the guide block 6 and is movably connected with the guide block 6 .

The cross-sectional area of the high temperature resistant contact head 3 is larger than that of the metal terminal 4 , and an elastic member 7 is arranged between the high temperature resistant contact head 3 and the guide block 6 . When the high temperature contact head 3 is in contact with the welding strip, it is pressed down by the welding strip, and the elastic member 7 shrinks, so that the high temperature contact head 3 and the welding strip can achieve adaptive close contact. After the welding strip is removed, the elastic member 7 uses elastic force to The high temperature resistant contact head 3 bounces up and returns to its original state.

The elastic member in this embodiment is a spring, preferably a cylindrical spring, the elastic member 7 is sleeved on the metal terminal 4, and the two ends of the elastic member 7 are respectively connected to the lower surface of the high temperature resistant contact head 3 and the guide block 6. Abutting on the top surface.

As shown in FIG. 4 , the bottom of the metal terminal 4 is provided with a limit block 8 with a cross-sectional area larger than the through hole on the guide block 6 , and the limit block 8 is located below the guide block 6 .

The working principle of the present invention is:

As shown in FIG. 1 , the stringer table traverse mechanism 11 sends the battery string 12 to the corresponding position of the camera 10 , and the stringer table traverse mechanism 11 presses down so that the welding tapes at both ends of the battery string 12 are connected to the corresponding electrodes respectively. The high temperature resistant contact head 3 on the 2 contacts, the metal terminal 4 moves downward, the elastic member 7 is compressed, the high temperature resistant contact head 3 and the welding strip realize self-adaptive close contact, and the traverse mechanism 11 of the stringer machine stops working , the high temperature resistant contact head 3 makes the contact between the high temperature resistant contact head 3 and the battery string welding strip stable due to the force of the elastic member 7 .

After that, the EL imaging system can be photographed and tested. During the automatic test, the stability of the equipment is high, the EL imaging effect of the battery string is stable and good, and the contact parts can be used for more than one month, and then cleaned once.

In the present invention, the electrodes 2 on each electrode holder 1 are individually designed, and the number is set according to the number of grid lines, and can self-stretch to ensure that each grid line welding tape is pressed firmly to ensure stable and uniform power-on. The service life of the electrode, the electrode is made of two different materials, and the dynamic contact part with the welding belt is made of high temperature resistant and easy-to-clean materials, such as graphite, and the static contact with the positive and negative electrodes of the power cord of the power supply is fixed by metal materials to ensure energy efficiency. Secure with screws.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention.

Claims (10)

1. The utility model provides an electricity contact mechanism that goes up in photovoltaic module cluster EL automated inspection, includes two relative electrode mount (1), characterized by, electrode mount (1) on swing joint have a plurality of independent electrodes (2) respectively, electrode (2) can be along vertical direction reciprocating motion.

2. The electrification contact mechanism in the automatic detection of the photovoltaic module string EL according to claim 1, characterized in that the number of the electrodes (2) on the electrode fixing frame (1) is the same as the number of the solder strips at the end part of the battery string to be detected.

3. The power-on contact mechanism in the automatic EL detection of the photovoltaic module string according to claim 1, wherein the electrode (2) comprises a high-temperature-resistant contact head (3) for contacting with a solder strip and a metal binding post (4) for electrically connecting with a power supply, the high-temperature-resistant contact head (3) is fixedly connected with the metal binding post (4), and the metal binding post (4) is movably connected with the electrode fixing frame (1) and can reciprocate along a vertical direction.

4. The power-on contact mechanism in the automatic EL detection of the photovoltaic module string as claimed in claim 3, wherein the high temperature resistant contact head (3) is a graphite cushion block, and the metal binding post (4) is a copper bar.

5. The mechanism of claim 4, wherein the top of the graphite block is planar.

6. The power-on contact mechanism in the automatic EL detection of the photovoltaic module string according to claim 3, wherein the electrode fixing frame (1) comprises a base (5) and guide blocks (6) fixed on the base (5), the guide blocks (6) correspond to the electrodes (2) one by one, through holes matched with the shape and size of the metal binding posts (4) are formed in the guide blocks (6), and the metal binding posts (4) are inserted into the guide blocks (6) and movably connected with the guide blocks (6).

7. The power-on contact mechanism in the automatic EL detection of the photovoltaic module string as claimed in claim 6, characterized in that the cross-sectional area of the high-temperature resistant contact (3) is larger than that of the metal binding post (4), and an elastic member (7) is arranged between the high-temperature resistant contact (3) and the guide block (6).

8. The power-on contact mechanism in the automatic EL detection of the photovoltaic module string according to claim 7, wherein the elastic member (7) is sleeved on the metal binding post (4), and two ends of the elastic member (7) are respectively abutted against the lower surface of the high-temperature resistant contact head (3) and the upper surface of the guide block (6).

9. The power-on contact mechanism in the automatic detection of the photovoltaic module string EL according to claim 7, characterized in that the bottom of the metal binding post (4) is provided with a limit block (8) with a cross-sectional area larger than that of the through hole on the guide block (6), and the limit block (8) is positioned below the guide block (6).

10. The power-on contact mechanism in the automatic detection of the photovoltaic module string EL as claimed in claim 1, wherein a camera fixing frame (9) is arranged below the electrode fixing frame (1), and a camera (10) is arranged on the camera fixing frame (9).

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