Passivation method of battery piece

A technology of battery sheet and potassium hydroxide, which is applied in the direction of circuits, electrical components, sustainable manufacturing/processing, etc., can solve problems such as battery efficiency decline, and achieve the effect of improving battery sheet efficiency

Pending Publication Date: 2021-02-09
ZHEJIANG JINKO SOLAR CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

[0004] The embodiment of the present invention provides a passivation method for battery slices, which is beneficial to solve the problem of battery efficiency decline after battery cutting

Method used

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  • Passivation method of battery piece
  • Passivation method of battery piece
  • Passivation method of battery piece

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Experimental program
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Embodiment Construction

[0021] It can be seen from the background art that the efficiency of the cut battery sheet in the prior art needs to be improved.

[0022] refer to figure 1 , a structure of a cut passivated battery sheet includes: a battery sheet 100 , a cutting damage area 104 , an electrode 105 and a passivation layer 107 .

[0023] The battery sheet 100 includes a cutting damage area 104, dangling bonds are formed on the cutting surface, and a passivation layer 107 is directly formed on the cutting surface, which will cause the electron-hole recombination center formed by the dangling bonds to be located in the cutting damage area 104, and the electrons and The holes recombine in the cutting damage region 104 , the efficiency of the battery sheet 100 decreases, and the passivation layer 107 does not play a passivation effect.

[0024] In order to solve the above problems, the present invention provides a cell passivation method, which removes the cutting damage area, electrons and holes r...

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Abstract

The embodiment of the invention provides a passivation method of a battery piece. The passivation method comprises the following steps: providing a whole battery piece; cutting the whole battery pieceto form a plurality of discrete battery pieces, wherein each battery piece is provided with a front face, a back face and a cutting face, the front faces and the back faces are opposite, the cuttingfaces are connected with the front faces and the back faces, the battery pieces are further provided with cutting damage areas penetrating through the front faces and the back faces, and the cutting faces are the outer sides of the cutting damage areas; removing the whole cutting damage area by adopting a chemical corrosion mode to form a corrosion surface for connecting the front surface and theback surface; and carrying out passivation treatment on the corrosion surface to form a passivation layer. The embodiment of the invention is beneficial to improving the efficiency of the battery piece.

Description

technical field [0001] Embodiments of the present invention relate to the field of photovoltaic technology, and in particular to a passivation method for a cell. Background technique [0002] With the rapid development of laser technology, laser slicing has become a very economical solution to improve the power loss of the entire cell. Use laser cutting technology to cut the whole battery sheet into half or multiple small sliced ​​batteries, and then connect the sliced ​​batteries in series with conductive ribbons. The series current is lower than the current of the whole piece, and the current drop of the sliced ​​batteries can improve the performance of photovoltaic modules. power loss. [0003] However, with the in-depth research on laser slicing, it is found that although the problem of power loss of photovoltaic modules has been solved, the problem of efficiency loss of sliced ​​cells has been introduced. And the progress of lamination technology development. Conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/0216
CPCH01L31/1868H01L31/02167Y02P70/50
Inventor 金井升韩璐张昕宇
Owner ZHEJIANG JINKO SOLAR CO LTD
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