阅读说明：本技术 切片电池的制备方法、切片电池及光伏组件 (Preparation method of sliced cell, sliced cell and photovoltaic module ) 是由 刘运宇 邓伟伟 于 2019-09-19 设计创作，主要内容包括：本发明公开了一种切片电池的制备方法、切片电池及光伏组件,所述切片电池的制备方法,包括以下步骤：对至少一个电池片进行切割,得到子电池片；在至少一个所述子电池片的切割面涂覆钝化保护材料,得到所述切片电池。根据本发明的切片电池的制备方法,通过采用上述步骤制备切片电池,可以有效减小子电池片边缘复合。当切片电池应用于光伏组件时,可以减小效率损失,提升光伏组件的功率和长期稳定性。而且,通过采用涂覆的方式,工艺简单,且使得钝化保护材料的厚度可控。(The invention discloses a preparation method of a sliced battery, the sliced battery and a photovoltaic module, wherein the preparation method of the sliced battery comprises the following steps: cutting at least one battery piece to obtain sub-battery pieces; and coating a passivation protection material on the cutting surface of at least one sub-battery piece to obtain the sliced battery. According to the preparation method of the sliced battery, the sliced battery is prepared by adopting the steps, so that the edge recombination of the sub-battery piece can be effectively reduced. When the slice battery is applied to the photovoltaic module, the efficiency loss can be reduced, and the power and the long-term stability of the photovoltaic module are improved. Moreover, by adopting a coating mode, the process is simple, and the thickness of the passivation protective material is controllable.)

1. The preparation method of the sliced battery is characterized by comprising the following steps of:

cutting at least one battery piece to obtain sub-battery pieces;

and coating a passivation protection material on the cutting surface of at least one sub-battery piece to obtain the sliced battery.

2. The method for preparing a sliced battery as claimed in claim 1, further comprising, after the step of cutting at least one battery piece to obtain sub-battery pieces:

and stacking a plurality of the sub-battery pieces, wherein the cutting surfaces of the sub-battery pieces are in the same orientation.

3. The method for manufacturing a sliced battery as defined in claim 2, wherein the plurality of the sub-battery pieces are stacked and the cutting surfaces of the plurality of the sub-battery pieces are oriented in the same direction, further comprising:

keeping the cutting surfaces of the sub-battery pieces flush.

4. The method for producing a sliced battery as defined in any one of claims 1 to 3, further comprising, after the coating of the passivation protective material on the cut surface of at least one of the sub-battery slices:

and drying the surface of one side of the sub-battery piece coated with the passivation protection material.

5. The method for preparing sliced batteries according to claim 4, wherein the surface of the sub-battery piece coated with the passivation protection material is dried by hot air at 80-200 ℃.

6. The method for preparing a sliced battery as claimed in claim 1, wherein the passivation protective material is coated on the cut surface by means of ink-jet or brush coating.

7. The method for manufacturing a sliced cell according to claim 1, wherein the passivation protecting material is formed on the cut surface by means of PECVD or ALD.

8. The method for producing a sliced battery as claimed in claim 1, wherein the passivation protecting material is coated at a thickness d, where d satisfies: d is more than or equal to 10nm and less than or equal to 200 nm.

9. The method for preparing a sliced battery as claimed in claim 1, wherein the passivation protective material is aluminum oxide, zinc oxide or silicon nitride.

10. A sliced battery produced by the method for producing a sliced battery according to any one of claims 1 to 9.

11. A photovoltaic module comprising the sliced cell of claim 10.

Technical Field

The invention relates to the technical field of photovoltaics, in particular to a preparation method of a sliced battery, the sliced battery and a photovoltaic module.

Background

In the crystal silicon battery, in order to promote photovoltaic module power, can carry out the series welding after cutting the battery piece to reduce photovoltaic module's operating current, thereby reduce photovoltaic module series resistance's loss, and then can reach the purpose that improves photovoltaic module power.

Among them, the battery piece is generally cut by laser. However, after laser dicing, the cut portion of the cell is directly exposed to the external environment, and even if packaging is performed during subsequent use, the cut surface has severe surface recombination, which reduces the power and long-term stability of the cell and the photovoltaic module.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for manufacturing a sliced battery, which can effectively reduce edge recombination of sub-battery slices. When the slice battery is applied to the photovoltaic module, the efficiency loss can be reduced, and the power and the long-term stability of the photovoltaic module are improved.

The invention also aims to provide a battery piece prepared by the preparation method of the sliced battery.

Still another object of the present invention is to provide a photovoltaic module having the above cell.

The preparation method of the sliced battery according to the embodiment of the first aspect of the invention comprises the following steps:

cutting at least one battery piece to obtain sub-battery pieces;

and coating a passivation protection material on the cutting surface of at least one sub-battery piece to obtain the sliced battery.

According to the preparation method of the sliced battery provided by the embodiment of the invention, the sliced battery is prepared by adopting the steps, so that the edge recombination of the sub-battery piece can be effectively reduced. When the slice battery is applied to the photovoltaic module, the efficiency loss can be reduced, and the power and the long-term stability of the photovoltaic module are improved. Moreover, by adopting a coating mode, the process is simple, and the thickness of the passivation protective material is controllable.

According to some embodiments of the invention, after the cutting at least one battery piece to obtain sub-battery pieces, the method further comprises:

and stacking a plurality of the sub-battery pieces, wherein the cutting surfaces of the sub-battery pieces are in the same orientation.

According to some embodiments of the invention, the stacking the plurality of sub-battery pieces with the cutting surfaces of the plurality of sub-battery pieces facing in a consistent direction further comprises:

keeping the cutting surfaces of the sub-battery pieces flush.

According to some embodiments of the invention, after the applying the passivation protection material on the cut surface of at least one of the sub-battery pieces, the method further comprises:

and drying the surface of one side of the sub-battery piece coated with the passivation protection material.

According to some embodiments of the present invention, the surface of the sub-battery sheet coated with the passivation protection material is dried with hot air at 80 ℃ to 200 ℃.

According to some embodiments of the invention, the passivation protection material is applied to the cut surface by means of ink-jet or brush coating.

According to some embodiments of the invention, the passivation protection material is formed on the cutting face by means of PECVD or ALD.

According to some embodiments of the invention, the passivation protection material is applied at a thickness d, wherein d satisfies: d is more than or equal to 10nm and less than or equal to 200 nm.

According to some embodiments of the invention, the passivation protection material is aluminum oxide, zinc oxide or silicon nitride.

The sliced battery according to the embodiment of the second aspect of the present invention is prepared by the method for preparing the sliced battery according to the embodiment of the first aspect of the present invention.

A photovoltaic module according to an embodiment of the third aspect of the invention comprises a diced cell according to an embodiment of the above-described second aspect of the invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow chart of a method for manufacturing a sliced battery according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a plurality of sliced cells placed in a stack according to an embodiment of the invention.

Reference numerals:

a sub-cell sheet 1; the protective material 2 is passivated.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

A method of manufacturing a sliced battery according to an embodiment of the present invention is described below with reference to fig. 1 to 2. The slice battery prepared by the preparation method can be applied to photovoltaic modules. In the following description of the present application, the application of the sliced cell to a photovoltaic module is exemplified.

As shown in fig. 1, the method for preparing a sliced battery according to an embodiment of the first aspect of the present invention includes the steps of:

s10, cutting at least one battery piece to obtain a sub-battery piece 1;

and S20, coating a passivation protection material 2 on the cutting surface of at least one sub-battery piece 1 to obtain the sliced battery.

In step S10, the battery piece may be cut into halves; the solar cell module can also be cut into more cells, so that the loss of series resistance is reduced, the effective light receiving area of the photovoltaic module can be increased, the power of the photovoltaic module in unit area is improved, and the material cost of the photovoltaic module in unit area is reduced. Of course, it is also possible to cut large-area cells into small pieces for integration into everyday miniaturized use.

For example, the cell piece may be cut by a red or green laser, and in order to increase the laser cutting rate, the cutting depth may be generally smaller than the thickness of the cell piece, for example, the thickness of the cell piece is 120-. Of course, the cell piece can be completely cut by directly using laser, and in this case, higher laser energy or multiple times of scribing are needed.

In the step S20, the passivation protection material 2 is coated on the cut surface of the cut sub-cell piece 1, and the passivation protection material 2 can play a passivation protection role on the cut surface of the sub-cell piece 1, so that the problem that the cut surface is exposed outside and is not protected after the cell piece is cut is solved, edge recombination of the sub-cell piece 1 is reduced, and when the cut cell is applied to a photovoltaic module, the power and reliability of the photovoltaic module can be improved. Moreover, the passivation protection material 2 is directly coated on the cutting surface of the sub-battery piece 1, so that the process is simple, the operation is convenient, and the coating speed is high, thereby further reducing the edge recombination of the sub-battery piece 1 and improving the utilization rate of the passivation protection material 2. In addition, the coating mode can control the thickness of the passivation protective material 2, so that the sliced battery has the capability of better bearing mechanical friction and can reduce the cost.

According to the method for manufacturing the sliced battery of the embodiment of the invention, the edge recombination of the sub-battery piece 1 can be effectively reduced by manufacturing the sliced battery through the steps S10-S20. When the slice battery is applied to the photovoltaic module, the efficiency loss can be reduced, and the power and the long-term stability of the photovoltaic module are improved. Moreover, by adopting a coating mode, the process is simple, and the thickness of the passivation protection material 2 can be controlled.

According to some embodiments of the present invention, referring to fig. 1 in combination with fig. 2, after cutting at least one battery piece to obtain a sub-battery piece 1, the method further includes:

and S11, stacking the sub-battery pieces 1, wherein the cutting surfaces of the sub-battery pieces 1 are in the same direction. In the description of the present invention, "a plurality" means two or more. Thus, by stacking a plurality of sub-battery sheets 1 and keeping the cutting surfaces of the plurality of sub-battery sheets 1 oriented uniformly (for example, to the right in fig. 2), the plurality of sub-battery sheets 1 can be coated with the passivation protection material 2 at the same time, the production efficiency of the sliced battery is greatly improved, and the cost can be saved.

Further, the plurality of sub-battery pieces 1 are stacked and the cutting surfaces of the plurality of sub-battery pieces 1 are oriented in the same direction, and the method further comprises the following steps:

the cut surfaces of the plurality of sub-battery pieces 1 are kept flush.

For example, the cut surfaces of the plurality of sub-battery pieces 1 may all be located in the same plane. So set up, can make passivation protective material 2 can coat on the cutting face of a plurality of sub-battery pieces 1 more evenly, and can guarantee the uniformity of passivation protective material 2 thickness.

According to some embodiments of the present invention, after the applying the passivation protection material 2 to the cut surface of at least one of the sub-battery pieces 1, the method further comprises:

and S30, drying the surface of one side of the sub-battery piece 1 coated with the passivation protection material 2.

After the step S20, by drying the side surface of the sub-battery piece 1 coated with the passivation protection material 2 by blowing, the passivation protection material 2 can be more reliably attached to the cut surface of the sub-battery piece 1, so that the cut surface of the sub-battery piece 1 can be better protected. In addition, one step of drying operation is added, so that the preparation efficiency of the sliced battery can be improved, and the production cost is reduced.

Optionally, the surface of one side of the sub-battery sheet 1 coated with the passivation protection material 2 is dried by hot air at 80-200 ℃. This can further increase the drying rate of the sub-battery sheet 1.

According to some alternative embodiments of the invention, the passivation protection material 2 is applied to the cut surface by means of ink-jet or brush coating. For example, the passivation protection material 2 can be coated on the cutting surface of the sub-battery piece 1 through a spraying device, the spraying device is simple, the initial equipment investment is small, and the process is simple. Here, it should be noted that the structure, the operation principle, and the like of the spraying device are well known to those skilled in the art, and are not described herein again.

Of course, the present invention is not limited thereto, and according to other alternative embodiments of the present invention, the passivation protection material 2 may also be formed on the cut surface by means of PECVD (Plasma Enhanced Chemical Vapor Deposition, which refers to Plasma Enhanced Chemical Vapor Deposition) or ALD (Atomic layer Deposition, which is a method that can plate the material on the substrate surface layer by layer in the form of a single Atomic film). Thus, the passivation film formed on the cut surface of the sub-cell sheet 1 obtained by these two methods has good film formation quality.

Optionally, the passivation protection material 2 is applied with a thickness d, where d satisfies: d is more than or equal to 10nm and less than or equal to 200 nm. Therefore, the coating thickness d of the passivation protection material 2 is set to satisfy that d is more than or equal to 10nm and less than or equal to 200nm, and the cost can be effectively saved while the power and the stability of the slice battery and the photovoltaic module are ensured to be improved. For example, when d is less than 10nm, the passivation protective material 2 has a small thickness and is easily worn, thereby being disadvantageous to the long-term stability of the sliced cell and the photovoltaic module. When d is more than 200nm, the passivation protecting material 2 has a relatively thick thickness, which causes a decrease in production efficiency and an increase in material usage, thereby increasing costs.

Alternatively, the passivation protection material 2 is aluminum oxide, zinc oxide, silicon nitride, or the like. For example, alumina slurry or zinc oxide sol may be formed on the cut surfaces of the sub-battery pieces 1 by ink-jet or brush coating. Of course, the passivation film may be a silicon nitride film formed by PECVD or an aluminum oxide film formed by ALD.

The sliced battery according to the embodiment of the second aspect of the present invention is prepared by the method for preparing the sliced battery according to the embodiment of the first aspect of the present invention.

According to the sliced battery of the embodiment of the invention, the sliced battery prepared by the preparation method has the advantages that the efficiency of the sliced battery is reduced by more than 0.1% by taking the half-cutting of the battery slice as an example, and the efficiency can be reduced by more than 0.3% when a plurality of sliced batteries are coated at the same time. Moreover, the loss of the cutting surface is reduced by passivating and protecting the cutting surface of the sub-battery piece 1, the loss caused by cutting can be reduced to be within 0.05%, and the loss caused when a plurality of sliced batteries are coated is reduced to be within 0.1%.

A photovoltaic module according to an embodiment of the third aspect of the invention comprises a diced cell according to an embodiment of the above-described second aspect of the invention.

According to the photovoltaic module provided by the embodiment of the invention, by adopting the sliced cell, the power and the reliability of the whole photovoltaic module can be improved.

Other configurations and operations of photovoltaic cells according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.