CN210778617U

CN210778617U - Broken-grid-preventing hollow electrode for large-size battery with size of more than 200mm

Info

Publication number: CN210778617U
Application number: CN201921307178.5U
Authority: CN
Inventors: 张彩霞; 陈影; 吴仕梁; 路忠林; 张凤鸣
Original assignee: Jiangsu Sunport Power Corp Ltd
Current assignee: Jiangsu Sunport Power Corp Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-16
Anticipated expiration: 2029-08-13

Abstract

The utility model discloses a jumbo size battery that is used for more than 200 x 200mm prevents disconnected bars fretwork electrode, this electrode include a plurality of main bars that are parallel to each other and a plurality of thin bars that are parallel to each other, and main bars are connected with thin bars mutually perpendicular, thin bars and main bars handing-over department are trapezoidal, and the thin bars of handing-over department go to the bottom for trapezoidal, prolong thin bars direction by handing-over department and narrow down gradually. The battery designed and manufactured by the utility model has greatly reduced proportion of EL graph broken grids, and especially has obvious effect in the middle of the thin grids and the crossing place of the thin grids and the main grid; the front silver paste is saved, and the non-silicon cost of the battery is reduced; the battery is simple to realize, can be realized only by replacing the screen plate, is easy to industrialize and has high yield; the battery electrode has large tension and better reliability, and the problem of insufficient solder joint at the assembly end is greatly reduced.

Description

Broken-grid-preventing hollow electrode for large-size battery with size of more than 200mm

Technical Field

The utility model relates to a disconnected bars fretwork electrode is prevented to jumbo size belongs to MWT solar cell-processing technology field.

Background

In these years, photovoltaic technology is rapidly developed, technologies such as high-efficiency PERC, double-sided batteries and black silicon are put into mass production in the aspect of batteries, and N-type and heterojunction technologies also start to have certain market share; the technologies of double glass, half, multi-main grid, laminated tile and the like in the aspect of assembly also enter the large-scale industrialization stage. In addition to many technological breakthroughs in pulling and slicing of single crystal silicon wafers (such as multi-pulling technology, diamond wire cutting technology, etc.), another phenomenon of concern in single crystal silicon wafers is that the sizes of single crystal silicon wafers tend to become larger, such as 156.75mm, 157.25mm, 157.4mm, 157.75mm, 158.75mm, 161.7mm, and even 166.7mm, 200mm, etc.

In view of the trend of the market, the size of the silicon chip is increased, and the size of the corresponding battery is also increased, so that the technical characteristic needs to be technically adjusted at the battery end, and an obvious debugging is the adjustment of the grid line of the battery. Technical personnel are required to pay attention to the design of the grid lines, the traditional 5BB main grid in the market is dominant, and the grid breaking problem exists if the grid line distance is increased after the size is increased. Due to the grid line breakage problem caused by large size, the size is increased, the silver paste consumption of the grid line is high, the cost is increased, the problem of tensile force reliability is waited to be solved, and the like.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: to the problem and not enough that exist among the prior art, the utility model provides a can prevent disconnected bars fretwork electrode is prevented to jumbo size that disconnected bars.

The technical scheme is as follows: the utility model provides a prevent disconnected bars fretwork electrode for jumbo size battery more than 200 x 200mm, includes a plurality of main bars that are parallel to each other and a plurality of thin bars that are parallel to each other, and main bar and thin bar are perpendicular to each other and are connected, the thin bar is trapezoidal with main bar handing-over department, and the thin bar of handing-over department is trapezoidal lower bottom, and the thin bar direction of extending from handing-over department narrows gradually, reduces disconnected bars problem.

Preferably, the width of the lower bottom of the trapezoid is 2-3 times of the width of the normal fine grid.

Preferably, the height of the trapezoid is about 1 mm.

Preferably, a secondary main grid perpendicular to the thin grid is arranged in the middle of the thin grid between the two main grids, so that the grid breaking problem is reduced.

Preferably, the width of the secondary main gate is the same as that of the fine gate.

Preferably, the secondary main grids are arranged between the fine grids at intervals, so that grid breakage is reduced, battery efficiency is improved, and cost per watt is reduced.

Preferably, the main grid is a hollow main grid, and on the basis of meeting the width of the main grid, the part added in the middle of the battery electrode is not printed with silver paste, so that a hollow shape is formed, and the size is saved.

Preferably, the hollow parts and the solid parts of the main grid are alternately connected.

Has the advantages that: the battery designed and manufactured by the utility model has greatly reduced proportion of EL graph broken grids, and especially has obvious effect in the middle of the thin grids and the crossing place of the thin grids and the main grid; the front silver paste is saved, and the non-silicon cost of the battery is reduced; the battery is simple to realize, can be realized only by replacing the screen plate, is easy to industrialize and has high yield; the battery electrode has large tension and better reliability, and the problem of insufficient solder joint at the assembly end is greatly reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a trapezoidal thin grid of the utility model, and FIG. 4 is a trapezoidal thin grid;

fig. 3 is a schematic diagram of a hollow structure of the main grid of the present invention, in which 5 is a solid main grid and 6 is a hollow main grid;

fig. 4 is another schematic diagram of the hollow structure of the main grid of the present invention, in which 5 is a main grid of solid part and 6 is a main grid of hollow part.

Detailed Description

The invention will be further elucidated with reference to the drawings and the specific embodiments.

As shown in fig. 1-4, the anti-broken grid hollowed-out electrode for the large-size battery with the length of 200 x 200mm or more comprises a plurality of main grids 1 and a plurality of fine grids 2, wherein the fine grids 2 are parallel to the fine grids 2, the main grids 1 are parallel to the main grids 1, the fine grids 2 are vertically connected with the main grids 1, and the widths of the main grids 1 and the fine grids 2 are different from each other at the joint, so that the current to be carried is approximate, therefore, the fine grids at the joint are designed in a trapezoidal shape, the width of the thick and fine grids is increased by two to three times at the joint with the main grids, the width of the fine grids is gradually reduced, and the length of about 1mm is increased to the normal width of the fine grids.

A plurality of fine grids 2 are connected between two main grids 1, but because a current collecting empty area is arranged between the fine grids 2 at the position without the main grids 1, the middle position between the fine grids 2 and the fine grids 2 in parallel is designed, small vertical fine grids 3 are added, the grid breaking problem is reduced, the sub-main grids 3 are arranged between the fine grids 2 in an interval mode, and the width of the sub-main grids 3 is the same as that of the fine grids 2.

The main grid 1 adopts a hollowed-out design, namely, on the basis of meeting the width of the main grid 1, the middle of the battery electrode is added with a part without printing silver paste to form a hollowed-out shape, so that slurry is saved, the hollowed-out part and the solid part of the main grid 1 are alternately connected, the hollowed-out form of the main grid 1 can be various, fig. 3 shows one hollowed-out form, and fig. 4 shows another hollowed-out form.

The utility model discloses be particularly suitable for with jumbo size 200X 200mm above 4BB,5BB, battery design such as 6BB, be particularly suitable for with the positive main grid of two-sided battery, back main grid, positive thin grid, the thin grid in the back also is applicable to the positive grid line design of conventional battery simultaneously.

In the solar cell manufacture process, only need behind the silicon nitride coating film, according to the utility model discloses a figure preparation otter board, printing back electrode prints the aluminium back of the body field again, then implements again the utility model relates to a main bars shape, then sintering, test battery conversion efficiency.

If the battery is a double-sided battery, the fine grid is printed on the back surface of the battery according to the utility model, and then the sintering test is carried out.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a be used for jumbo size battery of more than 200 × 200mm to prevent disconnected bars fretwork electrode, includes a plurality of main bars (1) that are parallel to each other and a plurality of thin bars (2) that are parallel to each other, and main bars (1) are connected with thin bars (2) mutually perpendicular, its characterized in that: the junction of the fine grid (2) and the main grid (1) is trapezoidal, the fine grid at the junction is the lower bottom of the trapezoid, and the direction of the fine grid gradually narrows from the junction; a secondary main grid (3) which is vertical to the thin grids (2) is arranged in the middle of the thin grids (2) between the two main grids (1); the width of the secondary main grid (3) is the same as that of the fine grid (2).

2. The anti-broken grid hollowed-out electrode for the large-size battery with the size of 200 x 200mm or more according to claim 1, wherein the anti-broken grid hollowed-out electrode comprises: the width of the lower bottom of the trapezoid is 2-3 times of the width of the fine grid.

3. The anti-broken grid hollowed-out electrode for the large-size battery with the size of 200 x 200mm or more according to claim 1, wherein the anti-broken grid hollowed-out electrode comprises: the height of the trapezoid is 1 mm.

4. The anti-broken grid hollowed-out electrode for the large-size battery with the size of 200 x 200mm or more according to claim 1, wherein the anti-broken grid hollowed-out electrode comprises: the secondary main grids (3) are arranged among the fine grids (2) in an interval mode.

5. The anti-broken grid hollowed-out electrode for the large-size battery with the size of 200 x 200mm or more according to claim 1, wherein the anti-broken grid hollowed-out electrode comprises: the main grid (1) is a hollow main grid.

6. The anti-broken grid hollowed-out electrode for the large-size battery with the size of 200 x 200mm or more according to claim 5, wherein the anti-broken grid hollowed-out electrode comprises: the hollow parts and the solid parts of the main grid (1) are alternately connected.