CN210245514U

CN210245514U - N-type efficient TOPCon battery

Info

Publication number: CN210245514U
Application number: CN201921233554.0U
Authority: CN
Inventors: Yang Zou; 邹杨; Chengfa Liu; 刘成法; Daming Chen; 陈达明; Yifeng Chen; 陈奕峰; Yu He; 何宇; Yao Wang; 王尧; Wenjie Lin; 林文杰; Rui Xia; 夏锐; Ling Yuan; 袁玲; Jian Gong; 龚剑
Original assignee: Trina Solar Co Ltd
Current assignee: Trina Solar Changzhou Technology Co ltd; Trina Solar Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-04-03
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a high-efficient TOPCon battery of N type, including a plurality of battery pieces, the battery piece includes positive electrode and back electrode, the positive electrode includes many thin grid lines and at least one main grid line that is interrupted the setting; the back electrode comprises a plurality of thin grid lines and a plurality of main grid lines, at least one main grid line in the back electrode is composed of at least two sections of main grid line sections which are arranged discontinuously, and one end of the main grid line section in the same main grid line of the back electrode, which is close to the adjacent main grid line section, is forked to form two branch lines. Two ends of a main grid line in the positive electrode and the back electrode are respectively forked to form two branch lines. The utility model discloses can cooperate current high-efficient N type TOPCon technology to reach a purpose that promotes battery efficiency, can reduce the metal thick liquids consumption at the positive back in the production moreover, reach one and fall this purpose, and the utility model discloses can cooperate the new technology of low reaches subassembly, promote the purpose of subassembly production yield and subassembly power.

Description

N-type efficient TOPCon battery

Technical Field

The utility model belongs to the technical field of the photovoltaic, concretely relates to high-efficient TOPCon battery of N type.

Background

In the photovoltaic industry, screen printing is mainly applied to electrode formation of cells, and screen printing is utilized

The basic principle that partial meshes are permeable to the slurry and partial meshes are impermeable to the slurry is adopted for printing. During printing, slurry is poured into one end of the screen, a scraper is used for applying certain pressure on the slurry part of the screen, and the screen moves towards the other end of the screen, and the slurry is extruded onto the substrate from the meshes of the pattern part by the scraper in the moving process. The scraper blade is in line contact with the screen printing plate and the printing stock all the time in the printing process, the contact line moves along with the movement of the scraper blade, and other parts of the screen are in a separation state from the printing stock, so that the printing size precision is ensured and the smearing of the printing stock is avoided. When the scraper blade is lifted after scraping the whole printing area, the silk screen is also separated from the substrate, the slurry is slightly scraped back to the initial position by the ink returning blade, and the workbench returns to the loading position, so that the printing stroke is complete.

Printing screens occupy a very important ring in screen printing processes, where screen pattern design is a key, for example: 1. according to the requirements of different customers, the patterns of the screen printing plate are correspondingly adjusted; 2. the figure shape is designed and adjusted, so that the aims of reducing printing unit consumption, reducing total consumption of noble metal production and reducing cost can be fulfilled; 3. the conversion efficiency of the battery piece can be improved to a certain degree according to the design of the figure shape of the matched battery process; 4. the specially designed pattern can be matched with the process of a downstream assembly end, so that the production yield and the power of the solar assembly are improved. The graphic design of the printing screen is therefore crucial for the performance of the battery.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a high-efficient TOPCon battery of N type through the design to the main grid line, improves the battery performance.

The technical scheme of the utility model is that: an N-type high-efficiency TOPCon battery comprises a plurality of battery pieces, wherein each battery piece comprises a positive electrode and a back electrode, and the positive electrode comprises a plurality of thin grid lines and at least one main grid line which is arranged discontinuously; the back electrode comprises a plurality of thin grid lines and a plurality of main grid lines, at least one main grid line in the back electrode is composed of at least two sections of main grid line sections which are arranged discontinuously, and one end, close to the adjacent main grid line section, of the main grid line section in the same main grid line of the back electrode is forked to form two branch lines.

The utility model is combined with the improvement of the assembly end process, can reduce the poor welding of the assembly and improve the integral generating power of the assembly, and preferably adopts discontinuous arrangement in the middle part as optimization,

the main grid line segment is divided into two sections, and the two sections of the main grid line segment are symmetrically arranged.

Preferably, two ends of the main grid line in the positive electrode and the back electrode are respectively forked to form two branch lines. The design that two branch lines are formed by the fact that the tail ends of the two sides of the main grid line are split can reduce the consumption of slurry of a single printed battery piece, and meanwhile the conversion efficiency of the battery is improved.

Preferably, the width of the main gate line in the positive electrode and the back electrode is 0.05 μm, and the width of the branch line is 0.25 μm. The size can reduce the slurry consumption of a single-chip printed battery piece, reduce the cost and simultaneously improve the conversion efficiency of the battery on the premise of ensuring the pulling and supporting force of the printing slurry and qualified reliability.

Preferably, at least one of the thin gate lines, which intersect two branch lines adjacent to two adjacent main gate line segments, is provided to be disconnected in a region between the two branch lines.

Preferably, among the thin gate lines intersecting two branch lines adjacent to two adjacent main gate line segments, a plurality of thin gate lines distant from the branch points of the two branch lines are arranged to be disconnected in a region between the two branch lines.

Preferably, the number of the thin gate lines provided to be disconnected in the region between the two branch lines is four.

Preferably, the PAD PADs on the main gate line in the positive electrode have different sizes, and the PAD PADs on the main gate line in the back electrode have different sizes.

Preferably, the distances between the adjacent PAD PADs on the main gate line in the positive electrode are different, and the distances between the adjacent PAD PADs on the main gate line in the back electrode are different. The assembly end welding technology is improved, the PAD welding points are different in size, the distance between every two adjacent PAD welding points is different in size, poor welding can be reduced, and the production yield of assembly products is improved.

The utility model discloses the quantity of the thin grid line in well positive electrode and the back electrode can have many, as preferred, the total number of the thin grid line in positive electrode and the back electrode is 90 ~ 120. The technology is combined with the front surface and the back surface of an N-type high-efficiency TOPCon battery, on the basis of ensuring good metallization contact performance of the front surface and the back surface, the total number of the front surface and the back surface is 90-120, and under the condition of the number, the Voc and the Isc of the electrical performance of the battery can be improved, so that the total conversion efficiency of the battery is improved.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

the utility model discloses can cooperate current high-efficient N type TOPCon technology to reach a purpose that promotes battery efficiency, can reduce the metal thick liquids consumption at the positive back in the production moreover, reach one and fall this purpose, and the utility model discloses can cooperate the new technology of low reaches subassembly, promote the purpose of subassembly production yield and subassembly power.

Drawings

Fig. 1 is the schematic structural diagram of two branch lines at two ends of the middle main grid line.

Fig. 2 is a schematic structural view of the break between the positive electrodes according to the present invention.

Fig. 3 is a schematic structural view of a break between middle back electrodes according to the present invention.

Fig. 4 is a schematic structural diagram of the PAD point on the front main gate line and the front main gate line of the present invention.

Fig. 5 is a schematic structural diagram of the PAD point on the middle back main gate line and the back main gate line of the present invention.

Detailed Description

Example 1

An N-type high-efficiency TOPCon battery comprises a plurality of battery pieces 3, wherein each battery piece comprises a positive electrode and a back electrode, and the positive electrode comprises a plurality of thin grid lines 2 and at least one main grid line 1 which is arranged discontinuously; the back electrode comprises a plurality of thin grid lines 2 and a plurality of main grid lines 1, at least one main grid line 1 in the back electrode is composed of at least two sections of main grid lines 1 which are arranged discontinuously, and one end, close to the adjacent main grid line 1, of each main grid line 1 in the same main grid line 1 of the back electrode is forked to form two branch lines.

The utility model discloses combining in subassembly end technology improvement, can reducing the subassembly welding and harmfully, promoting the whole generated power of subassembly, preferably take in the mid portion and be interrupted the setting, main grid line 1 section is two sections promptly, and 1 section symmetry of two sections main grid lines sets up.

As shown in fig. 1 to 5, the two ends of the main grid line 1 in the middle positive electrode and the back electrode of the present invention are equally divided into two branch lines. The design that two branch lines are formed by the fact that the tail ends of the two sides of the main grid line 1 are split can reduce the consumption of slurry of a single printed battery piece, and meanwhile the conversion efficiency of the battery is improved.

Generally, the width of the bus bar 1 in the positive and back electrodes is 0.05 μm, and the width of the branch line is 0.25 μm. The size can reduce the slurry consumption of a single-chip printed battery piece, reduce the cost and simultaneously improve the conversion efficiency of the battery on the premise of ensuring the pulling and supporting force of the printing slurry and qualified reliability.

At least one thin gate line 2 among thin gate lines 2 intersecting two branch lines adjacent to two adjacent main gate lines 1 in a segment is disconnected in a region between the two branch lines. In general, of the thin gate lines 2 intersecting two branch lines adjacent to two adjacent main gate lines 1, a plurality of thin gate lines 2 distant from the branch points of the two branch lines are arranged to be broken in the region between the two branch lines, and four thin gate lines 2 are arranged to be broken in the region between the two branch lines.

As shown in fig. 4 and 5, the PAD PADs on the bus bar 1 in the positive electrode are different in size, and the PAD PADs on the bus bar 1 in the back electrode are different in size. The distance between the adjacent PAD welding points on the main grid line 1 in the positive electrode is different, and the distance between the adjacent PAD welding points on the main grid line 1 in the back electrode is different. The assembly end welding technology is improved, the PAD welding points are different in size, the distance between every two adjacent PAD welding points is different in size, poor welding can be reduced, and the production yield of assembly products is improved.

The utility model discloses the quantity of the thin grid line 2 in well positive electrode and the back electrode can have many, and the total number of the thin grid line 2 in positive electrode and the back electrode is 90 ~ 120 for example in this embodiment. The technology is combined with the front surface and the back surface of an N-type high-efficiency TOPCon battery, on the basis of ensuring good metallization contact performance of the front surface and the back surface, the total number of the front surface and the back surface is 90-120, and under the condition of the number, the Voc and the Isc of the electrical performance of the battery can be improved, so that the total conversion efficiency of the battery is improved.

The effect of the above N-type high-efficiency TOPCon battery is compared with that of the conventional battery in tables 1 and 2.

TABLE 1 comparison of printing paste specific consumption

TABLE 2 cell efficiency enhancement contrast

Claims

1. An N-type high-efficiency TOPCon battery comprises a plurality of battery pieces, wherein each battery piece comprises a positive electrode and a back electrode, and the positive electrode is characterized by comprising a plurality of thin grid lines and at least one main grid line which is arranged discontinuously; the back electrode comprises a plurality of thin grid lines and a plurality of main grid lines, at least one main grid line in the back electrode is composed of at least two sections of main grid line sections which are arranged discontinuously, and one end, close to the adjacent main grid line section, of the main grid line section in the same main grid line of the back electrode is forked to form two branch lines.

2. The N-type high efficiency TOPCon cell of claim 1, wherein the two ends of the bus bars in the positive and back electrodes are each split to form two branch lines.

3. The N-type high efficiency TOPCon cell of claim 2, wherein the width of the bus bars in the positive and back electrodes is 0.05 μm and the width of the branch lines is 0.25 μm.

4. An N-type high efficiency TOPCon cell as claimed in any of claims 1 to 3 wherein, of the thin gate lines that intersect two of the branch lines adjacent to two adjacent main gate line segments, at least one thin gate line is disconnected in the region between the two branch lines.

5. The N-type high-efficiency TOPCon battery as claimed in claim 4, wherein among the thin grid lines intersecting two of the branch lines adjacent to two of the main grid line segments, a plurality of thin grid lines distant from the branch points of the two branch lines are arranged to be disconnected in a region between the two branch lines.

6. The N-type high efficiency TOPCon cell of claim 5, wherein there are four thin grid lines that are disconnected in the area between two of the forking lines.

7. The N-type TOPCon cell as claimed in any of claims 1 to 3 and 5 to 6, wherein the size of each PAD PAD on the bus bar in the positive electrode is different, and the size of each PAD PAD on the bus bar in the back electrode is different.

8. The N-type high efficiency TOPCon cell as in claim 7, wherein the distance between adjacent PAD PADs on the bus bars in the positive electrode is different in magnitude and the distance between adjacent PAD PADs on the bus bars in the back electrode is different in magnitude.

9. The N-type high efficiency TOPCon cell of any of claims 1 to 3, 5 to 6 and 8, wherein the total number of fine grid lines in the positive and back electrodes is 90 to 120.

10. The N-type high efficiency TOPCon battery of claim 1, wherein the main gate line segment is two segments, the two segments being symmetrically disposed.