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Main-grid-free solar battery, preparation method and application thereof, and battery module and preparation method thereof

A technology of solar cells and battery components, applied in the field of solar cells, can solve the problems of high manufacturing cost, high technical cost, and complicated manufacturing process of solar cells without bus bars

Pending Publication Date: 2021-07-06
TONGWEI SOLAR ENERGY (CHENGDU) CO LID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a solar cell without busbar, battery module and its preparation method and application, which solves the problems of complex manufacturing process, low efficiency, high manufacturing cost and high technical cost of the existing solar cell without busbar. technical problem

Method used

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  • Main-grid-free solar battery, preparation method and application thereof, and battery module and preparation method thereof
  • Main-grid-free solar battery, preparation method and application thereof, and battery module and preparation method thereof
  • Main-grid-free solar battery, preparation method and application thereof, and battery module and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] like Figure 1 to Figure 5 As shown, a busbar-free solar cell of the present invention includes a battery sheet 1 without a busbar and a plurality of upper and tinned metal wires 3 that do not intersect with each other and intersect each fine grid line 2 on the front side of the battery sheet 1 A plurality of solder paste pads 6 are distributed on the thin grid lines 2 on the front side of the battery sheet 1, and the tinned metal wire 3 passes through the solder paste pads 6 to connect each thin grid line 2 provided with the solder paste pads 6 Electrically connected in series in the arrangement direction of the fine grid lines.

[0052] The electrode pattern of the solar cell designed by the present invention only prints thin grid lines at the battery end, and cancels the main grid line; at the same time, the tinned metal wire used as the "main grid" is connected to the component end through the solder paste pad, so that the tinned metal wire Combines nicely with the...

Embodiment 2

[0056] This embodiment is based on the embodiment 1 to further describe the busbarless solar cell.

[0057] like Image 6 As shown, a busbar-free solar cell includes a battery sheet 1 without a busbar and a plurality of upper and tin-plated metal wires 3 that do not intersect each other and intersect each thin grid line 2 on the front side of the battery sheet 1. A plurality of solder paste pads 6 are distributed on the thin grid lines 2 on the front of the sheet 1, and the tinned metal wire 3 passes through the solder paste pads 6 to connect each thin grid line 2 provided with the solder paste pads 6 on the thin grid lines. Electrically connected in series in the direction of arrangement; multiple back electrodes of the battery sheet 1 are arranged in a matrix, and tinned metal wires having the same number as the vertical columns arranged in the matrix and not intersecting each other are arranged on the back of the battery sheet 1, The tinned metal wire connects the back ele...

Embodiment 3

[0063] A battery assembly, including a front layer material, an encapsulation material, a solar cell layer, an encapsulation material and a back layer material connected from top to bottom, the solar cell layer includes several solar cells arranged in sequence, and the solar cell is implemented In the solar cell in Example 1 or Example 2, among two adjacent solar cells, the tinned metal wire 3 on the front of one solar cell is electrically connected to the tinned metal wire 3 on the back of the other solar cell, so that the positive and negative electrodes are connected in series.

[0064] Further, among two adjacent solar cells, the tinned metal wire 3 on the front of one solar cell is electrically connected to the tinned metal wire 3 on the back of the other solar cell through the bus bar 4 .

[0065] The present invention uses solder paste pads to fuse tinned metal wires and thin grid wires, thereby realizing the interconnection welding of batteries without busbars, realizin...

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Abstract

The invention discloses a main-grid-free solar battery, a preparation method and application thereof, and a battery module and a preparation method thereof. The main-grid-free solar battery comprises a main-grid-free battery piece and a plurality of tinned metal wires, a plurality of solder paste bonding pads are distributed on fine grid lines on the front face of the battery piece, the tinned metal wire is used for electrically connecting the fine grid lines provided with the solder paste bonding pads in series in the arrangement direction of the fine grid lines through the solder paste bonding pads. According to the electrode pattern, only the thin grid lines are printed at the battery end, and main grid lines are omitted; and meanwhile, tin-plated metal wires serving as main grids are connected at the module end through a solder paste bonding pad, so that the tin-plated metal wires and thin grid lines of the solar cell are well combined to collect and transmit current. According to the invention, the plurality of tinned metal wires are added as the main grid lines, so that a carrier transport path is shortened to reduce series resistance, and series resistance loss is reduced; and in addition, main grid lines are omitted, so that shielding of the grid lines to sunlight is reduced, photo-generated current is increased, and photoelectric conversion efficiency is improved.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a busbar-free solar cell, a cell component, a preparation method and application thereof. Background technique [0002] The electrodes of the solar cell are screen-printed conductive silver paste on the silicon substrate, and form ohmic contact with the silicon substrate through high-temperature sintering. The electrodes are mainly composed of main grid lines and thin grid lines. According to whether there is a busbar, the solar cell is divided into a traditional solar cell with a busbar and a solar cell without a busbar. Among them, the traditional solar cells containing busbars, such as 3BB, 4BB and 5BB solar cells, are welded by a stringer to pull out a copper ribbon coated with tin-lead alloy, and weld it on the positive and negative sides of adjacent cells. On the negative main grid line to realize the series connection between multiple battery slices. This automatic serial wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/05H01L31/18
CPCH01L31/022441H01L31/0512H01L31/0516H01L31/188Y02E10/50Y02P70/50
Inventor 王岚陈明李忠涌李书森王璞
Owner TONGWEI SOLAR ENERGY (CHENGDU) CO LID
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