CN210006745U

CN210006745U - structure for improving double-sided battery back printing

Info

Publication number: CN210006745U
Application number: CN201921348848.8U
Authority: CN
Inventors: 杨蕾; 尹丙伟; 王涛; 余波; 丁士引
Original assignee: Tongwei Solar Anhui Co Ltd
Current assignee: Tongwei Solar Anhui Co Ltd; Tongwei Solar Hefei Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-01-31
Anticipated expiration: 2029-08-20

Abstract

The utility model also discloses kinds of structures that improve double-sided battery back printing, back of the body utmost point back of the body handing-over department keeps away from fixedly connected with elementary aluminium grid line of back electrode, the equal fixedly connected with secondary aluminium grid line in upper end of elementary aluminium grid line and back of the body utmost point back of the body handing-over department, the utility model discloses can improve back printing quality, adopt the mode of secondary printing to the printing of back battery aluminium grid line, reduce at back of the body utmost point back of the body handing-over department because the influence that the printing difference in height brought, improve the battery piece quality to reduce droing of battery piece aluminium grid line, improve the qualification rate of battery piece.

Description

structure for improving double-sided battery back printing

Technical Field

The utility model relates to a two-sided solar cell technical field specifically is kinds of structures that improve two-sided battery back printing.

Background

With the implementation of the program of the leaders, the demand proportion of the double-sided battery is gradually increased. The back pattern of the double-sided cell is also composed of a back electrode and an aluminum grid. Since there is a printing height difference between the aluminum gate line and the back electrode at the overlapping position, it is very easy to cause a part of the aluminum back field to fall off at the overlapping position, and therefore, improvement in this respect is needed.

The prior art has the defects that when the prior art is used for printing, the back pole and the back field of a double-sided battery are required to be overlapped, and the back pole and the aluminum grid line have height differences when being printed at a printing joint, as shown in the attached drawing 1 of the specification, height differences are generated at the joint of the conventional aluminum grid line 51 and the back field of the back pole at the position where the aluminum paste is overlapped, so that the aluminum paste cannot be well contacted with the battery piece 1, and the aluminum paste falls off at the joint when the 3M falling test is carried out on the battery piece after sintering, so that the aluminum grid line of the battery piece is easy to fall off, and the qualification rate of the battery piece is greatly influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide kinds of structures that improve double-sided battery back printing to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

A method for improving the reverse printing of a bifacial battery, comprising the steps of:

s1, primary printing: printing an upper back electrode on the back surface of the battery piece and forming a back electrode back field joint, wherein a primary aluminum grid line is printed at the tail end of the back electrode back field joint in a connecting way;

s2, secondary printing: and integrally printing a secondary aluminum grid line at the junction of the back electrode and the back field and above the primary aluminum grid line.

structure for improving double-sided battery back printing, including battery piece and back electrode, back electrode side fixedly connected with a plurality of back electrode back field handing-over departments, back electrode end fixedly connected with elementary aluminium grid line is kept away from to back electrode back field handing-over department, the equal fixedly connected with secondary aluminium grid line in upper end of elementary aluminium grid line and back electrode back field handing-over department.

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

the utility model discloses can improve back printing quality, improve double-sided battery's reliability simultaneously, adopt the mode of secondary printing to the printing of back battery aluminium grid line, reduce at back of the body utmost point back of the body handing-over department because the influence that the printing difference in height brought improves the battery piece quality to reduce droing of battery piece aluminium grid line, improve the qualification rate of battery piece.

Drawings

FIG. 1 is a schematic view of a connection structure of a back electrode and a conventional aluminum gate line in the prior art;

fig. 2 is a schematic view of a connection structure between the junction of the back electrode and the back field and the aluminum gate line;

fig. 3 is a schematic view of a local back electrode structure on a battery plate of the present invention;

FIG. 4 is a schematic diagram of the printing result of the primary printing process flow of the present invention;

fig. 5 is a schematic diagram of the printing result of the secondary printing process flow of the present invention.

In the figure: 1 battery piece, 2 back electrodes, 3 back electrode back field junctions, 4 primary aluminum grid lines, 5 secondary aluminum grid lines and 51 conventional aluminum grid lines.

Detailed Description

The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of , but not all embodiments.

Referring to fig. 1-5, the present invention provides technical solutions:

s1, primary printing, namely printing a back electrode 2 on the back of a battery piece 1 and forming a back electrode back field junction 3, wherein the back electrode back field junction 3 is formed on the side of a back electrode 2 and is arranged corresponding to an aluminum grid line 4 printed in the later stage, a primary aluminum grid line 4 is connected and printed at the tail end of the back electrode back field junction 3, the primary aluminum grid line 4 is printed at the tail end of the back electrode back field junction 3 and does not form an overlapping part with the back electrode back field junction 3, after the primary printing is completed, back surface structures as shown in the specification and the attached figure 4 are formed, the tail ends of the primary aluminum grid line 4 and the back electrode back field junction 3 are just contacted with each other, and the problem that a height difference is generated between the primary aluminum grid line 4 and the back electrode back field junction 3 during printing is completely avoided.

S2, secondary printing, namely integrally printing a secondary aluminum grid line 5 on the junction 3 of the back electrode and the back electrode 2 and the primary aluminum grid line 4, after the primary printing is finished, times of printing integral secondary aluminum grid lines 5 are printed, the secondary aluminum grid lines 5 and the primary aluminum grid lines 4 are identical in width and are aligned up and down, the secondary aluminum grid lines 5 are directly and simultaneously printed on the junction 3 of the primary aluminum grid line 4 and the back electrode and form contact according to the conventional printing mode of the aluminum grid lines 51, and therefore the purpose that the unqualified condition of 3M is improved in the mode of secondary printing of the back aluminum grid lines is achieved, when the primary aluminum grid lines 4 are printed, centipede feet of the primary aluminum grid lines 4 and the back electrode 2 are required to be just contacted and not overlapped, and the printing pattern and the printing mode of the secondary aluminum grid lines 5 are identical to those of the conventional aluminum grid lines 51.

improve structure of two-sided battery back printing, make through above-mentioned method, including battery piece 1 and back electrode 2, back electrode 2 side fixedly connected with a plurality of back of the body utmost point back of the body field handing-over department 3, back electrode 2 and back of the body utmost point back of the body field handing-over department 3 all adopt with material printing to make, back of the body utmost point back of the body field handing-over department 3 keeps away from back electrode 2 fixedly connected with elementary aluminium grid line 4, the equal fixedly connected with secondary aluminium grid line 5 in the upper end of elementary aluminium grid line 4 and back of the body utmost point back of the body field handing-over.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

The structure for improving the back printing of the double-sided battery comprises a battery piece (1) and a back electrode (2), wherein a plurality of back electrode back field joints (3) are fixedly connected to the side of the back electrode (2), and is characterized in that primary aluminum grid lines (4) are fixedly connected to the back electrode back field joints (3) far away from ends of the back electrode (2), and secondary aluminum grid lines (5) are fixedly connected to the upper ends of the primary aluminum grid lines (4) and the back electrode back field joints (3).