System and method for automatically and circularly complementing crystalline-silicon solar cell texture etch solution

Abstract

The invention relates to a system and a method for automatically and circularly complementing a texture-etching solution of a crystalline-silicon solar cell. A liquid conveying pipeline (1) is connected with a liquid storage box (2); the liquid storage box (2), a pump (5), at least three reaction troughs (8) and the liquid storage box (2) are sequentially connected so as to form a circular loop; the liquid storage box (2) is connected with the reaction troughs (8) sequentially by the pump (5), a manual valve (6), an automatic valve (7) and a flow meter (9); the liquid storage box (2) and the reaction troughs (8) are internally provided with a heating system and a liquid level sensor (10); and the liquid storage box (2) is connected with a solution dosing box (11) by the manual valve (6) and the automatic valve (7). In the invention, all reaction troughs are connected by the liquid storage box to form one reaction trough with large volume, the influence of the reaction consumption and the reaction heat on the concentration and temperature of the solution is reduced, the uniformity of the solution is improved, and the changing rate of the concentration is effectively reduced when complementing the solution.

Description

technical field [0001] The invention belongs to the technical field of crystalline silicon solar cell production technology, and in particular relates to an automatic circulation replenishment system and method for texturing liquid of crystalline silicon solar cell. Background technique [0002] In the production process of crystalline silicon solar cells, the process of texturing needs to be adopted. The principle is to use the mixed chemical solution to react with the silicon wafer to form a textured shape on the surface of the silicon wafer. Whether the concentration and temperature of the mixed solution are uniform directly affects the effect of texturing, thus affecting the quality of the cell. [0003] At present, there are two common ways to keep the concentration and temperature of the texturing liquid uniform as follows: [0004] 1. Bubbling + reaction tank heating + manual rehydration [0005] 2. Circulation in the tank + reaction tank heating + manual rehydratio...

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Problems solved by technology

[0008] In practice, it is found that these two methods have a general control effect on the concentration and temperature uniformity of the textured mixed solution, and the concentration of the solution between the tanks is not the same, so it is impossible to achieve good control of automatic liquid replenishment, and the degree of automation is not high.

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