Electric contact device of solar cell
By designing a solar cell electrical contact device that is compatible with MBB and 0BB type grid lines, using conductive strip fence structure and printed circuit board technology, the problem of testing 0BB type grid lines in the existing technology is solved, and efficient and accurate electrical contact testing is achieved, reducing costs.
Patent Information
- Application Number
- CN202420582331.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-03-25
AI Technical Summary
The prior art is difficult to effectively test MBB type and 0BB type gate line solar cells, especially for 0BB type gate line, there are problems such as fragment accumulation, unreliable contact, complex structure, and high cost.
A solar cell electrical contact device that is compatible with MBB and 0BB type grid lines is designed, and the upper and lower contacts of the fence structure consisting of several conductive strips are used. Combined with printed circuit board and probe array technology, it ensures the reliability and stability of electrical contact while reducing light occlusion.
It realizes efficient electrical contact testing of MBB and 0BB type gate line solar cells, improves the accuracy and efficiency of the test, reduces costs, and avoids the problem of fragment accumulation.
Smart Images
Figure CN222637695U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of solar cell component testing, in particular to an electric contact device for a solar cell. Background Art
[0002] A solar cell is a thin semiconductor sheet that can generate electricity through the photovoltaic effect when exposed to light. The generated current is collected and conducted through the grid lines. During the production and development process, it is necessary to conduct electrical tests on the performance of solar cells. During the test, it is necessary to apply power to the two poles of the solar cell, or to collect electrical signals at the two poles of the solar cell for related tests. Electrical contact devices are required in all electrical tests to form detachable electrical contact with the solar cell to be tested.
[0003] The size of conventional solar cells ranges from 156mm to 230mm, with one side as the positive electrode and the other side as the negative electrode, and the positive and negative electrodes must be in contact separately. The grid lines on the surface of solar cells come in various forms. But they can be mainly divided into: 1. MBB type grid lines, the main body of this grid line is a large number of parallel thin grid lines, and then several main grid lines are used to connect the thin grid lines in series to form a cross; the number of main grid lines M ranges from 2 to 20; 2. 0BB type grid lines, the main body of this grid line is a large number of parallel thin grid lines, but there is no main grid line.
[0004] The existing technology has a relatively mature test solution for MBB type gate lines, that is, the upper and lower probe rows are used to make electrical contact and test the main gate lines. However, when testing different numbers of main gates, the probe rows need to be adjusted, which is time-consuming and labor-intensive. For 0BB type gate lines, some existing test solutions have problems such as debris accumulation, unreliable contact, or complex structure and high cost. Summary of the invention
[0005] The utility model aims to solve the above problems and provides an electrical contact device for solar cells that is compatible with both MBB and 0BB type grid lines.
[0006] The solar cell electrical contact device of the utility model comprises an upper contact piece, a carrier piece and a lower contact piece;
[0007] The upper contact piece and the lower contact piece are both fence structures composed of a plurality of conductive strips; because the solar cell needs to be exposed to light or photographed during testing, the fence structure can minimize the shading during lighting or photographing; the lower contact piece is set as a fence structure, and in the case that the solar cell to be tested is broken, the solar cell fragments can fall from the hollow area of the fence structure, avoiding accumulation and affecting subsequent tests, thereby improving test efficiency;
[0008] The upper contact piece is connected to the lower surface of the carrier; the carrier is used to support or fix the upper contact piece to prevent the upper contact piece from deforming and bending when in electrical contact with the solar cell to be tested, thereby ensuring the reliability and stability of the contact between the upper contact piece and the solar cell to be tested;
[0009] The position of the carrier corresponding to the conductive strip of the upper contact member is provided with a fence structure, which can effectively reduce the blocking of light and improve the test accuracy;
[0010] During the test, the upper contact piece is located above the solar cell to be tested, and is used to collect the electrical signal on the upper surface of the solar cell to be tested; the lower contact piece is located below the solar cell to be tested, and is used to collect the electrical signal on the lower surface of the solar cell to be tested; the conductive strip is used to make electrical contact with the fine grid line to realize the collection of electrical signals, thereby completing the test of the solar cell to be tested.
[0011] Furthermore, in the electrical contact device of the solar cell of the utility model, the upper contact member is a printed circuit board;
[0012] The printed circuit board is configured as a fence structure;
[0013] The printed circuit board is provided with a plurality of conductive strips in parallel. The printed circuit board is used, and its technology is mature, and it can be conveniently designed and manufactured into a fence structure; the printed circuit board includes two types, PCB and FPC, which are reliable as the upper contact part, simple in structure, and conducive to reducing manufacturing costs.
[0014] Furthermore, in the solar cell electrical contact device of the utility model, the lower contact member is a probe array; the conductive strips on the lower contact member are staggered double-row probe rows. Each probe has independent and elastic deformation capability, and the staggered double-row probe rows can ensure that the lower contact member is reliably and stably in electrical contact with the solar cell to be tested, thereby improving the test accuracy.
[0015] Furthermore, in the solar cell electrical contact device of the utility model, the lower contact member is a flexible deformable plate; a plurality of conductive strips are arranged on the flexible deformable plate. The flexible deformable plate is used because of its elastic deformation ability, and in combination with the conductive strips, the lower contact member can achieve reliable and stable electrical contact with the solar cell to be tested.
[0016] Furthermore, in the solar cell electrical contact device of the utility model, the upper contact pieces and the lower contact pieces are arranged in parallel. In some cases, two or even three solar cells need to be clamped at the same time, and by arranging multiple upper contact pieces and lower contact pieces in parallel, multiple solar cells can be electrically contacted independently at the same time, thereby improving the test efficiency.
[0017] Furthermore, in the solar cell electrical contact device of the utility model, a voltage collection area is provided on the conductive strip of the upper contact member. The voltage collection area is insulated from the conductive strip for collecting current, thereby meeting the requirements of Kelvin four-wire wiring and expanding the applicable scenarios of the electrical contact device of the utility model.
[0018] Furthermore, the solar cell electrical contact device of the utility model further includes a rotating wheel structure and a tray; a plurality of trays are arranged at equal intervals around the rotating wheel structure; at least one of the trays is located between the upper contact piece and the lower contact piece. By arranging the rotating wheel structure and the tray, the solar cell to be tested is placed on the tray during the test, and the rotating wheel structure is rotated and adjusted to allow the plurality of trays to be rotated one by one to between the upper contact piece and the lower contact piece for electrical performance testing, which can effectively improve the test efficiency.
[0019] The electric contact device of the solar cell described in the utility model is improved by the electric contact device in the solar cell test device, and the upper contact member and the lower contact member are both set as a fence structure composed of a plurality of conductive strips, so as to realize the electric contact of the solar cell to be tested, especially the solar cell without main grid line during the test process; the bearing member of the upper contact member is set as hollow, which can effectively avoid the electric contact device itself from blocking the light during the test process, and can effectively improve the accuracy of the test, and at the same time meet the requirements of infrared testing, and improve the scope of application of the device. The electric contact device of the solar cell described in the utility model has a simple structure, is realized by the inexpensive printed circuit board technology, is easy to manufacture and operate, has low cost, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the structure of the upper contact member according to an embodiment of the utility model;
[0021] Figure 2 This is a schematic diagram of the structure of the carrier and the upper contact member according to an embodiment of the utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the carrier and the upper contact member according to an embodiment of the utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the lower contact member according to an embodiment of the utility model;
[0024] Figure 5 This is a schematic diagram of the structure of the electrical contact device of the solar cell according to the embodiment of the utility model;
[0025] Figure 6 This is a schematic diagram of the rotating wheel structure and the tray structure of the embodiment of the utility model;
[0026] Among them, 1-upper contact piece, 2-lower contact piece, 3-carrying piece, 4-solar cell to be tested, 5-tray, 6-suction cup, 7-voltage collection area, 8-PCB board, and 9-rotating wheel structure. DETAILED DESCRIPTION
[0027] The electrical contact device of the solar cell of the utility model is described in detail below through the drawings and embodiments.
[0028] This embodiment discloses an electrical contact device for a solar cell, comprising an upper contact member 1, a carrier member 3 and a lower contact member 2; Figure 1 The upper contact member 1 is a fence structure composed of a plurality of conductive strips; in the disclosed embodiment, the upper contact member 1 is located above the solar cell 4 to be tested, and is used to collect the electrical signal on the upper surface of the solar cell 4 to be tested. The conductive strips are used to make electrical contact with the fine grid lines on the solar cell 4 to be tested; the lower contact member 2 is located below the solar cell 4 to be tested, and is used to collect the electrical signal on the lower surface of the solar cell 4 to be tested; the conductive strips of the lower contact member 2 correspond to the conductive strips of the upper contact member 1 in one-to-one position.
[0029] In the embodiment of the present disclosure, the upper contact 1 adopts a PCB board 8 in a printed circuit board. The PCB is a metal layer etched on an insulating layer. The metal layer is on the upper surface and the lower surface, and the insulating layer is in the middle. The whole can be designed and made into a fence structure. The PCB board 8 is an industrial product with mature technology and excellent cost performance, reliable performance, simple structure and low cost.
[0030] In the embodiment of the present disclosure, two upper contact members 1 are arranged in parallel, and are respectively electrically contacted with two solar cells 4 to be tested independently; Figure 1 As shown, two upper contact members 1 are arranged in parallel, one on each side; the upper contact member 1 on the right side and the upper contact member 1 on the left side have the same shape and are symmetrically arranged, and are not conductive to each other, thus avoiding mutual interference between the two solar cells when clamping and testing the two solar cells at the same time.
[0031] In the disclosed embodiment, the upper contact member 1 on each side is a fence structure composed of 10 conductive strips, which are used to collect the current signal of the solar cell and finally aggregate it to the test system; the width of the conductive strip is 0-5mm and the length is 80-250mm; a voltage collection area 7 is set on each conductive strip of the upper contact member 1, and the voltage collection area 7 is aggregated and derived from the other side of the PCB board 8. During the IV electrical performance test, because the solar cell needs to be exposed to light, and the camera needs to take pictures of the solar cell during the EL test, there is a hollow area outside the conductive strip, and the hollow area and the conductive strip constitute a fence structure; the fence structure can minimize the light blocking of light or taking pictures, and let as much light as possible pass through.
[0032] The support member 3 is used to support or fix the upper contact member 1 to prevent the upper contact member 1 from deforming and bending when in electrical contact with the solar cell, thereby ensuring the reliability and stability of the contact. Figure 2 , Figure 3 The carrier 3 shown is an aluminum alloy metal plate, and a fence structure is correspondingly provided in the area overlapping with the upper contact member 1 to reduce light blocking.
[0033] Because the lower surface of the solar cell does not need to be exposed to light or photographed, the lower contact member 2 does not need to reduce light shielding, and can enhance its own strength to ensure reliable and stable electrical contact with the solar cell. Figure 4 As shown, there are two lower contacts 2 arranged in parallel, one on each side. In the disclosed embodiment, the conductive strip of the lower contact 2 adopts a fence structure composed of multiple probe rows that is relatively mature on the market, which can ensure that solar cell fragments can fall from the hollow area of the fence structure to avoid accumulation.
[0034] Each conductive part of the lower contact 2 has independent and elastic deformation capability, which can ensure that the lower contact 2 is in reliable and stable electrical contact with the solar cell. In this embodiment, the probes on the probe row are INGUN brand GKS-100 model. Figure 4 As shown, the probes are staggered on the insulating strips to ensure good contact between the probes and the solar cell grid lines to the greatest extent. The two rows of probes are arranged in a certain pitch, but the positions of the two rows of probes differ by half a pitch. Such a staggered setting can achieve the best contact effect.
[0035] In specific applications, the lower contact member 2 may also be provided with a conductive strip on the flexible deformation plate, which may also achieve the same reliable contact effect.
[0036] In order to realize quick and convenient taking and placing of solar cells, a rotating tray 5 is also used in the embodiment of the present disclosure, including a rotating wheel structure 9 and a tray 5. According to the prior art, the tray 5 is used to carry and position the solar cells; Figure 5 As shown, the tray 5 and the lower contact piece 2 are located below the solar cell 4 to be tested, and the tray 5 is located above the lower contact piece 2; a suction cup 6 for adsorbing the battery sheet is provided on the tray 5; in order to avoid collision during movement, the suction cup 6 of the tray 5 is generally set in the hollow area of the lower contact piece 2.
[0037] When testing, if Figure 6As shown, the tray 5 disposed on the rotating wheel structure 9 enters between the upper contact member 1 and the lower contact member 2 in sequence under the action of the rotating wheel. The solar cell 4 to be tested placed on the tray 5 rotates with the tray 5 to the test position; the lower contact member 2 is pushed upward, and clamps the solar cell 4 to be tested together with the upper contact member 1, thereby achieving electrical contact with the positive and negative poles of the solar cell respectively. The conductive strips of the upper contact member 1 and the lower contact member 2 realize the collection of electrical signals by electrically contacting the fine grid lines of the solar cell 4 to be tested. The conductive parts of the lower contact member 2, because they have independent deformation capabilities, can ensure good electrical contact with each part of the solar cell, thereby achieving the test of the solar cell 4 to be tested.
Claims
1. An electrical contact device for a solar cell, characterized in that: comprising an upper contact member, a bearing member and a lower contact member; The upper contact piece and the lower contact piece are both fence structures composed of a plurality of conductive strips; The upper contact member is connected to the lower surface of the carrier; The position of the carrier corresponding to the conductive strip of the upper contact member is provided with a fence structure.
2. The electrical contact device for solar cells according to claim 1, characterized in that: The upper contact member is a printed circuit board; The printed circuit board is configured as a fence structure; A plurality of conductive strips are arranged in parallel on the printed circuit board.
3. The electrical contact device for solar cells according to claim 1, characterized in that: The lower contact is a probe array; The conductive strips on the lower contact member are double-row probe rows that are staggered.
4. The electrical contact device for solar cells according to claim 1, characterized in that: The lower contact member is a flexible deformable plate; The flexible deformation plate is provided with a plurality of conductive strips.
5. The electrical contact device for solar cells according to any one of claims 1 to 4, characterized in that: There are two upper contacts and two lower contacts arranged in parallel.
6. The electrical contact device for solar cells according to any one of claims 1 to 4, characterized in that: A voltage collection area is arranged on the conductive strip of the upper contact piece.
7. The electrical contact device for solar cells according to claim 6, characterized in that: Also includes a runner structure and a tray; A plurality of trays are arranged at equal intervals around the rotating wheel structure; At least one of the trays is located between the upper contact piece and the lower contact piece.