CN203179903U - Solar energy cell front side electrode structure, cell sheet and assembly - Google Patents

Abstract

The utility model relates to a front electrode structure of a solar cell, a battery sheet and a component. It includes a current export electrode and a current collection electrode. The current collection electrode is linear, including thick grid lines and thin grid lines. The thick grid lines are radially connected to the current export electrodes, and the thin grid lines are connected to the thick grid lines. The thick grid lines are distributed in the shape of leaf veins, and the thick grid lines and thin grid lines form a conductive unit with the current lead-out electrode as the center; there are more than one current lead-out electrodes, which are evenly arranged on the solar battery sheet. The positive electrode structure can effectively improve the light utilization and electron collection rate of the solar cell, and can effectively reduce the amount of noble metal silver paste used, and reduce the production cost of the solar cell.

Description

Solar cell front electrode structure and cell sheet and module

technical field

The utility model relates to the technical field of solar cells, in particular to a solar cell front electrode structure, cell sheets and components. the

Background technique

Solar cell electrodes are responsible for collecting the generated current and exporting it. Due to technical reasons, silver paste is mostly used on the front electrode of solar cells at present. Silver is a precious metal. The current design divides the main grid line into sections to reduce the amount of silver paste. consumption to reduce costs. the

However, after the main grid lines are segmented, the thin grid lines are still arranged vertically to the main grid lines, resulting in poor current collection effect. The utility model can effectively solve this problem. the

Contents of the invention

The purpose of this utility model is to provide a solar cell positive electrode structure and battery sheet in view of the above defects. Use the quantity to reduce the production cost of solar cells. the

The solar cell front electrode structure and battery sheet technical scheme of the utility model is that the front electrode structure includes a current deriving electrode and a current collecting electrode, and the current collecting electrode is linear, including a thick grid line and a thin grid line, and the thick grid line is in the form of It is radially connected to the current lead-out electrode, and the thin grid line is connected to the thick grid line. The thin grid line is distributed in a vein shape along the thick grid line. The thick grid line and the thin grid line form a conductive unit centered on the current lead-out electrode; the current lead-out electrode is a Above, evenly arranged on the solar cells. the

Each current lead-out electrode is connected to 8 thick grid lines, and the thick grid lines are radially evenly distributed around the current lead-out electrodes. the

The angle between the thin grid lines and the thick grid lines is 20-30 degrees, which is symmetrically distributed in the shape of leaf veins, with the current exporting electrode as the center, and the direction of divergence of the thick grid lines is consistent. the

The current lead-out electrode is one of rectangle, circle, polygon or irregular figure. the

A battery sheet with the above-mentioned solar cell front electrode structure of the front electrode. the

The above-mentioned component made of battery sheet, the current lead-out electrode on the front electrode of the battery chip is directly connected with the welding strip when the component is packaged, and leads the current out. the

The beneficial effects of the utility model are: the solar battery electrode structure saves the amount of slurry, reduces the production cost, and designs the layout of the current collecting electrodes according to the principle of the shortest path of each point on the cell to the current deriving electrode, and according to the current collecting electrodes according to their Carrying current, design its width. The current exporting electrode is designed according to factors such as current exporting ability and shading rate. When the component is packaged, the solder ribbon is directly connected to the current lead-out electrode to lead out the current. Therefore, when the component is packaged, it is consistent with the conventional welding component process and does not increase any cost. the

Description of drawings:

Fig. 1 shows that the utility model solar cell electrode structure schematic diagram;

FIG. 2 is a schematic diagram of the structure of a solar cell in the prior art.

In the figure, 101. current lead-out electrode, 102. thick grid line, 103. thin grid line, 104. a certain current generating point, 105. the thick grid line nearest to a certain current generating point, 106. the nearest to a certain current generating point Thin grid lines, 201. Segmented electrodes, 202. Main grid lines, 203. Sub grid lines. the

Detailed ways:

In order to better understand the utility model, the technical solutions of the utility model will be described below in conjunction with the accompanying drawings and examples, but the utility model is not limited thereto.

As shown in FIG. 2 of the attached drawing of the specification, it is an existing segmented solar cell electrode structure, the main grid line 202 is a segmented electrode 201, and the auxiliary grid lines are distributed perpendicular to the main grid line. The current at a certain point on the battery sheet of the segmented solar cell electrode must first reach the main grid line vertically, and then reach the segmented electrode. The path of the current is relatively long, so the series resistance is relatively high. the

The utility model relates to a front electrode structure of a solar cell and a battery sheet, the front electrode structure includes a current lead-out electrode 101 and a current collection electrode, and the current collection electrode is linear, including a thick grid line 102 and a thin grid line 103, the thick grid line The wires 102 are radially connected to the current lead-out electrodes 101, the thin grid lines 103 are connected to the thick grid lines 102, and the thin grid lines 103 are distributed in a vein shape along the thick grid lines 102, and the thick grid lines 102 and the thin grid lines 103 lead out the electrodes 101 with current. A conductive unit is formed as the center; more than one current lead-out electrode 101 is evenly arranged on the solar battery sheet. the

Each current lead-out electrode is connected to eight thick grid lines 102 , and the thick grid lines 102 are evenly distributed around the current lead-out electrodes 101 in a radial shape. the

The thin grid lines 103 and the thick grid lines 102 are symmetrically distributed in a vein shape at an angle of 20-30 degrees, with the current lead-out electrode 101 as the center and consistent with the divergence direction of the thick grid lines 102 . the

The current lead-out electrode 101 is one of rectangle, circle, polygon or irregular figure. the

A battery sheet with the above-mentioned solar cell front electrode structure of the front electrode. the

In a component made of the above-mentioned battery sheet, the current lead-out electrode 101 on the front electrode of the battery chip is directly connected to the welding ribbon when the component is packaged to lead out the current. the

Example 1

The solar cell is a square piece of 156mm*156mm, and the current lead-out electrodes 101 are set in a rectangular shape of 1.3mm*6mm, which are evenly arranged in the form of four rows and three columns. is 52mm. The width of the thick grid lines 102 is set to 100 microns, the width of the thin grid lines 103 is set to 50 microns, and the angle between the thick grid lines 102 and the thin grid lines 103 is 20 degrees. Taking the current generated by a certain current generating point 104 as an example, please refer to Figure 1 of the attached drawing of the specification. electrode 101 . In the present invention, the current generated by a certain current generating point 104 first reaches the thin grid line 106 closest to a certain current generating point, and then reaches the thick grid line 106 closest to a certain current generating point along the thin grid line 106 closest to a certain current generating point. The gate line 105 then reaches the current deriving electrode 101 along the thick gate line 105 closest to a certain current generating point. In the utility model, the current can reach the current lead-out electrode through a short route, thereby reducing the series resistance of the battery and improving the electrical performance parameters. It is best to have specific parameter values. During component packaging, the welding ribbon is directly connected to the current lead-out electrode 101 to lead out the current. Therefore, during component packaging, it is consistent with the conventional soldering component process and does not increase any cost.

Example 2

The solar cell is a square piece of 156mm*156mm, and the current lead-out electrodes 301 are set in a circular shape with a diameter of 1.3mm, and are evenly arranged in the form of four rows and four columns. Calculated based on the center of the current lead-out electrodes, the row spacing is 39mm, and the column spacing is 39mm. The width of the thick grid lines 302 is set to 100 microns, the width of the thin grid lines 303 is set to 50 microns, and the angle between the thick grid lines 302 and the thin grid lines 303 is 22.5 degrees. Same as Example 1, in the present invention, the current can reach the current lead-out electrode through a shorter route, thus reducing the series resistance of the battery and improving the electrical performance parameters. During component packaging, the welding ribbon is directly connected to the current lead-out electrode 101 to lead out the current. Therefore, during component packaging, it is consistent with the conventional soldering component process and does not increase any cost.

Claims (6)

1. A front electrode structure of a solar cell, characterized in that it comprises a current deriving electrode and a current collecting electrode, and the current collecting electrode is linear, including a thick grid line and a thin grid line, and the thick grid line is radially connected to the current deriving electrode , the thin grid lines are connected with the thick grid lines, and the thin grid lines are distributed in a vein shape along the thick grid lines. on solar cells. 2 . The solar cell front electrode structure according to claim 1 , wherein each current lead-out electrode is connected to 8 thick grid lines, and the thick grid lines are evenly distributed around the current lead-out electrodes in a radial shape. 3. The solar cell front electrode structure according to claim 1, characterized in that: the angle between the thin grid lines and the thick grid lines is 20-30 degrees, which is symmetrically distributed in the shape of leaf veins, with the current lead-out electrode as the center, and the thick grid lines The lines diverge in the same direction. 4. The front electrode structure of a solar cell according to claim 1, wherein the current lead-out electrode is one of circular, polygonal or irregular. 5. A battery sheet with a front electrode as described in any one of claims 1-4. 6. An assembly made of battery sheets according to claim 5, wherein the current lead-out electrode on the front electrode of the battery sheet is directly connected to the soldering strip to lead out the current when the assembly is packaged.

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