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Back contact solar cell string, preparation method, assembly and system

A technology for solar cells and battery modules, applied in the field of solar cells, can solve problems such as complex cell string processes, and achieve the effect of solving precise alignment and complex processes, simplifying processes, and reducing the requirements for precise alignment

Pending Publication Date: 2021-08-31
ZHEJIANG AIKO SOLAR ENERGY TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a back-contact solar cell string, which aims to solve the problems of precise alignment and complex process in the production of existing cell strings

Method used

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  • Back contact solar cell string, preparation method, assembly and system
  • Back contact solar cell string, preparation method, assembly and system
  • Back contact solar cell string, preparation method, assembly and system

Examples

Experimental program
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Effect test

Embodiment 1

[0049] see figure 1 , is a schematic structural diagram of a back-contact solar cell string provided by an embodiment of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown. The back-contact solar cell string provided by the embodiment of the present invention includes:

[0050] At least two battery sheets, each battery sheet includes alternately arranged positive electrode regions 11 and negative electrode regions 12;

[0051] An insulating layer 13 covering each positive electrode region 11 on one side of the battery sheet and each negative electrode region 12 on the other side of the battery sheet; and

[0052] Connecting the first bus bar 14 of two adjacent battery sheets, the first bus bar 14 is electrically connected to each positive electrode region 11 and negative electrode region 12 not covered by the insulating layer 13 in the two adjacent battery sheets.

[0053] Wherein, in one embodiment...

Embodiment 2

[0067] see Figure 7 , is a schematic flow chart of a method for preparing a back-contact solar cell string provided by the second embodiment of the present invention. For the convenience of illustration, only the parts related to the embodiment of the present invention are shown. This preparation method is used to prepare The back contact solar cell string, specifically, the method includes:

[0068] Step S11, respectively setting insulating layers on each positive electrode area on one side of the battery sheet and each negative electrode area on the other side of the battery sheet;

[0069] Among them, in one embodiment of the present invention, such as Figure 1 to Figure 5 As shown, a positive electrode region and a negative electrode region are arranged at intervals on the back of the battery sheet, wherein the positive electrode region includes a P-type doped region and a positive electrode thin grid line arranged on the P-type doped region, and the negative electrode ...

Embodiment 3

[0090] The third embodiment of the present invention also provides a battery assembly, which includes the back-contact solar cell string described in the foregoing embodiments.

[0091] Specifically, the assembly process of the battery assembly includes the following:

[0092] Battery sorting: Due to the strong randomness of the solar cell production line, the performance of the produced cells is not the same. In order to effectively combine cells with the same or similar performance, it should be based on the results measured by the battery test. The performance parameters are classified to improve the utilization rate of cells and make qualified cell components. Battery testing is to test the output parameters (current and voltage) of the battery.

[0093] Series connection: each battery sheet is prepared according to the preparation method described in the foregoing method embodiment, so that it is connected in series to form the battery string described in the foregoing d...

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Abstract

The invention is suitable for the technical field of solar cells, and provides a back contact solar cell string, a preparation method, an assembly and a system. The back contact solar cell string comprises at least two cell pieces, wherein each cell piece comprises positive electrode regions and negative electrode regions which are alternately arranged; an insulating layer covering each positive electrode region on one side of each cell piece and each negative electrode region on the other side of each cell piece; and a first bus bar used for connecting the two adjacent cell pieces, wherein the first bus bar is electrically connected with each positive electrode region and each negative electrode region which are not covered with the insulating layer in the two adjacent cell pieces. According to the back contact solar cell string provided by the invention, the problems that accurate alignment is needed and the process is complex when an existing cell string is manufactured are solved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a back-contact solar cell string, a preparation method, an assembly and a system. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. For conventional solar cells at present, the emitter contact electrode and the base contact electrode are respectively located on the front and back sides of the battery sheet. The front of the battery is the light-receiving surface, and the coverage of the metal emitter contact electrode on the front will inevitably cause a part of the incident sunlight to be reflected and blocked by the metal electrode, resulting in a part of optical loss. The coverage area of ​​the front metal electrode of an ordinary crystalline silicon solar cell is abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/05H01L31/054H01L31/18
CPCH01L31/0516H01L31/0547H01L31/18Y02E10/52H01L31/022441H01L31/0682H01L31/0504Y02E10/547H01L31/0201H01L31/02167H01L31/02363
Inventor 戴伟杨新强陈刚
Owner ZHEJIANG AIKO SOLAR ENERGY TECH CO LTD
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