阅读说明：本技术 一种提高半片太阳能电池组件光电转换效率的方法 (Method for improving photoelectric conversion efficiency of half solar cell module ) 是由 童锐 柯希满 张忠卫 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种提高半片太阳能电池组件光电转换效率的方法,包括将经激光切割成半片的电池片进行退火处理,在退火的过程的同时向炉内通入氧气。本发明通过对激光切割后的电池片采用退火工艺处理,同时在退火的过程中向氧化炉内通入氧气使激光切割损伤位置发生化学反应生成二氧化硅钝化膜,从而消除激光切割处由于电池片损伤导致的载流子复合,从而提升半片电池片的光电转换效率。(The invention discloses a method for improving photoelectric conversion efficiency of a half-piece solar cell module, which comprises the steps of annealing a cell piece cut into half pieces by laser, and introducing oxygen into a furnace during the annealing process. According to the invention, the cell piece after laser cutting is treated by adopting an annealing process, and oxygen is introduced into the oxidation furnace in the annealing process to enable the laser cutting damage position to generate a chemical reaction to generate a silicon dioxide passivation film, so that the carrier recombination caused by the cell piece damage at the laser cutting position is eliminated, and the photoelectric conversion efficiency of the half cell piece is improved.)

1. A method for improving photoelectric conversion efficiency of a half-piece solar cell module is characterized by comprising the following steps: the method comprises the steps of annealing the battery piece cut into half pieces by laser, and introducing oxygen into a furnace during the annealing process.

2. The method of claim 1, wherein the method comprises the steps of: the annealing temperature is 650-750 ℃, and the annealing time is 500-1500 s.

3. The method for improving the photoelectric conversion efficiency of the half-piece solar cell module as claimed in claim 1 or 2, wherein: the annealing temperature is 700 ℃.

4. The method for improving the photoelectric conversion efficiency of the half-piece solar cell module as claimed in claim 1 or 2, wherein: the annealing time is 1000 s.

5. The method of claim 1, wherein the method comprises the steps of: the flow rate of the introduced oxygen is 3000sccm-8000 sccm.

6. The method for improving the photoelectric conversion efficiency of the half-piece solar cell module as claimed in claim 1 or 5, wherein: the flow rate of the introduced oxygen was 6000 sccm.

Technical Field

The invention belongs to the field of solar cell manufacturing, and particularly relates to a method for improving photoelectric conversion efficiency of a half-piece solar cell module.

Background

With continuous progress of solar energy efficient battery research in the industry, the rated working current of most single polycrystalline battery assemblies is high at present, the average value of the rated working current is about 9A, power loss is generated when current flows through a welding strip in the assemblies, and the loss is mainly converted into heat energy and exists in the assemblies. Therefore, as the current increases, the loss of this portion increases. Because the current is halved after the battery is cut into half pieces, the voltage is unchanged, compared with the same solar battery assembly without the cut battery pieces, the same series-parallel connection design is adopted on the aspect of using the same battery pieces, the assembly voltage is doubled as compared with the whole battery assembly, the current is halved as compared with the whole battery assembly, and therefore the internal loss of the assembly can be reduced.

However, after the battery piece is cut into half pieces by laser, the battery piece is damaged by cutting at the laser cutting position, and the damaged position can form a recombination center to influence the collection of the current carriers of the battery piece, so that the conversion efficiency of the battery piece is reduced.

Disclosure of Invention

In order to solve the above problems, the present invention provides a method for improving the photoelectric conversion efficiency of a half-cell solar module.

The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:

a method for improving photoelectric conversion efficiency of a half-piece solar cell module comprises the steps of annealing a cell piece cut into half pieces by laser, and introducing oxygen into a furnace during annealing.

As a further improvement of the invention, the annealing temperature is 650-750 ℃, and the annealing time is 500-1500 s.

As a further improvement of the invention, the annealing temperature is 700 ℃.

As a further improvement of the invention, the annealing time is 1000 s.

As a further improvement of the invention, the flow rate of the introduced oxygen is 3000sccm-8000 sccm.

As a further improvement of the invention, the flow rate of the introduced oxygen gas is 6000 sccm.

The invention has the beneficial effects that: according to the invention, the cell piece after laser cutting is treated by adopting an annealing process, and oxygen is introduced into the oxidation furnace in the annealing process to enable the laser cutting damage position to generate a chemical reaction to generate a silicon dioxide passivation film, so that the carrier recombination caused by the cell piece damage at the laser cutting position is eliminated, and the photoelectric conversion efficiency of the half cell piece is improved.

Drawings

FIG. 1 is a block diagram of one embodiment of a battery assembly formed by connecting half-cells processed according to the present invention in series;

wherein, 1-half cell and 2-solder strip.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.

Control group: and no annealing process treatment.

In the following embodiment, different annealing process parameters are adopted to process the half cell piece 1 after laser cutting: