Manufacturing method of small piece of battery

Abstract

The invention discloses a manufacturing method of a small piece of battery. A silicon rod edge leather material is cut into small pieces of silicon wafers, and then production of battery pieces is completed through a matched battery production line so that the small piece of batteries required by half-piece, imbrication, splicing and other assembly technologies can be directly obtained. Compared with an existing edge leather material melting mode, by using the method of the invention, the edge leather material can be used more effectively, energy waste is reduced, and manufacturing cost of thesilicon wafers is greatly saved. In the invention, the silicon rod edge leather material is directly cut into the small silicon wafers so that damage layers on edges of the small silicon wafers can be removed in a manufacturing process of the battery pieces, an adverse effect of the edge damage layers is eliminated, and power losses of the small pieces of batteries caused by segmentation of finished battery pieces are avoided.

Description

technical field [0001] The invention relates to a method for preparing a small battery. Background technique [0002] Monocrystalline silicon wafers are cut from single crystal silicon rods. Generally, the single crystal silicon rods are first cut into squares to obtain square rods for preparing single crystal silicon wafers, and then the square rods are sliced ​​to obtain single crystal silicon wafers. The squaring of monocrystalline silicon ingots will produce side skins, and the side skins are generally returned to the furnace or used as high-efficiency polycrystalline ingot seed crystals, etc., resulting in a low utilization rate of monocrystalline silicon rods. [0003] In addition, the existing half-cell, shingled, and patchwork technologies all use small-piece batteries, and the existing small-piece batteries are all cut from finished battery pieces (square or quasi-square), and additional scribing and splitting are required The equipment / steps increase the productio...

AI Technical Summary

Problems solved by technology

The squaring of monocrystalline silicon ingots will produce side skins, and the side skins are generally returned to the furnace or used as high-efficiency polycrystalline ingot seed crystals, etc., resulting in a low utilization rate of monocrystalline silicon rods

[0003] In addition, the existing half-cell, shingled, and patchwork technologies all use small-piece batteries, and the existing small-piece batteries are all cut from finished battery pieces (square or quasi-square), and additional scribing and splitting are required equipment / steps, which increases production cost

[0004] And scribing and splitting the finished battery sheet. After the splitting is completed, a damaged layer will be formed on the edge of the small battery (that is, the break of the whole sheet). The damaged layer has very high surface defects, and the surface defects will become the carrier recombination center. As a result, the minority carrier lifetime in the edge area of ​​the small battery decreases, and the surface recombination current increases significantly, which in turn leads to the loss of the open circuit voltage and short circuit current of the small battery, that is, the power loss of the small battery