CN212676288U

CN212676288U - PERC double-sided battery

Info

Publication number: CN212676288U
Application number: CN202021651220.8U
Authority: CN
Inventors: 陈周; 张�林; 周小燕; 冉东; 任朋; 谢泰宏; 翟绪锦
Original assignee: Tongwei Solar Meishan Co Ltd
Current assignee: Tongwei Solar Meishan Co Ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-03-09
Anticipated expiration: 2030-08-10

Abstract

The utility model relates to a crystalline silicon solar cell produces and makes technical field, discloses a PERC double-sided battery, including establishing the passive film at the PERC battery silicon chip dead back, be equipped with fluting group, electrode fretwork region on the passive film, electrode fretwork region intersects with the fluting group is perpendicular, is equipped with the contraction distance fluting group that is on a parallel with self in the electrode fretwork region, the utility model discloses a contraction distance fluting group shortens the transmission distance of current carrier, therefore has reduced contact resistance, has increased the collection of electrode fretwork region current carrier, has improved the conversion efficiency of battery.

Description

PERC double-sided battery

Technical Field

The utility model belongs to the technical field of crystalline silicon solar cell manufacturing technology and specifically relates to a PERC double-sided battery is related to.

Background

With the continuous development of photovoltaic technology, the crystalline silicon solar cell is rapidly developed as a clean energy source for converting solar energy into electric energy by using a PERC double-sided battery.

As the photovoltaic industry becomes more competitive, reducing costs and improving efficiency becomes more and more important. The partial back contact solar cell PERC technology can greatly improve the open-circuit voltage and the short-circuit current of the cell by using a good passivation structure, thereby improving the cell efficiency. With the development of technology, PERC has completely replaced the traditional battery structure and has become the mainstream production technology. On the basis of a conventional PERC cell process, the double-sided PERC does not need to add any additional step, only the partial aluminum grid line structure on the back surface is required to replace the completely covered aluminum paste, the double-sided power generation function can be realized, and the competitiveness of the PERC cell is further improved.

The back process of the double-sided PERC battery is adjusted during production, an aluminum back field is changed into an aluminum grid line, and the back is enabled to be illuminated and generate electricity. When the back field is changed into an aluminum gate, the laser grooving pattern also needs to be adjusted and changed correspondingly, in the laser grooving process, local grooving is carried out on the back of the silicon wafer, namely, part of the Al203 and the SiNx thin film layer are punched to expose the silicon substrate, and the purpose is to realize contact between the back field and the silicon substrate through holes or grooves in the thin film. The slotting mode of the prior industry is the electrode position hollow line segment and the linear slotting, as shown in figure 1, the slotting hollow design of the electrode position is based on: 1. and 2, the current can be effectively collected by contacting with aluminum paste after laser grooving, so that the current collection in the region can not be improved even if the electrode is grooved, 2, the influence of the silver paste of the back electrode on the laser grooving to open a passivation layer to expose a silicon base is prevented, and the loss of the efficiency of the battery is reduced. But the area of the hollow part accounts for more than 3% of the area of the battery, so that the transmission distance of the current carrier at the position is increased, the contact resistance is improved, and the current collection is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the transmission distance of current carriers at the electrode is shortened, the contact resistance is reduced, the current collection is increased, and the conversion efficiency of the battery is improved.

The utility model adopts the technical scheme as follows:

a PERC double-sided battery comprises a passivation film arranged on the front surface and the back surface of a PERC battery silicon wafer, wherein a slotted line group and an electrode hollow-out area are arranged on the passivation film, the electrode hollow-out area is vertically intersected with the slotted line group, and a telescopic slotted line group parallel to the electrode hollow-out area is arranged in the electrode hollow-out area.

Furthermore, the reduced-pitch grooved line group comprises two reduced-pitch grooved lines symmetrically arranged along the vertical central line of the electrode hollow area.

Further, the grooved line group comprises a plurality of grooved lines which are uniformly distributed on the passivation film.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses in, because of the shrinkage distance fluting group parallel with electrode fretwork region and establish in electrode fretwork region, so the transmission distance of the current carrier in the shrinkage distance fluting group can shorten, therefore reduced contact resistance, increased the collection of electrode fretwork region current carrier, improved the conversion efficiency of battery.

2. The utility model discloses in, because of the vertical central line symmetry setting in the shrinkage grooving line edge electrode fretwork region, the transmission distance of the current carrier in the shrinkage grooving line group can shorten, and reduced the contact resistance of current carrier in transmission process.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the transport of carriers in the hollow regions of the electrodes;

FIG. 3 is a schematic diagram of the transport of carriers in the hollow regions of the electrodes according to the prior art;

the labels in the figure are: 1 passivation film, 2 grooved lines, 3 electrode hollow areas, 4 reduced pitch grooved lines, 5 current carriers and 51 current carrier transmission paths.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

A PERC double-sided battery comprises a passivation film 1 arranged on the front surface and the back surface of a PERC battery silicon wafer, wherein a slotting line group and an electrode hollow-out area 3 are arranged on the passivation film 1, the electrode hollow-out area 3 is vertically intersected with the slotting line group, and a telescopic slotting line group parallel to the electrode hollow-out area 3 is arranged in the electrode hollow-out area 3.

Further, the reduced pitch grooved line group comprises two reduced pitch grooved lines 4 symmetrically arranged along the vertical central line of the electrode hollow-out area 3.

Further, the grooved line group includes a plurality of grooved lines 2 uniformly distributed on the passivation film 1.

Example 1

Referring to fig. 1-3, a PERC double-sided battery comprises a passivation film 1 arranged on the front and back of a PERC battery silicon wafer, wherein a slotted line group and an electrode hollow-out area 3 are arranged on the passivation film 1, the electrode hollow-out area 3 is vertically intersected with the slotted line group, and a telescopic slotted line group parallel to the electrode hollow-out area 3 is arranged in the electrode hollow-out area 3.

In the embodiment, the transmission distance of the current carriers 5 is shortened by the reduced-pitch slotted line group, so that the contact resistance is reduced, the collection of the current carriers 5 in the electrode hollow area 3 is increased, and the conversion efficiency of the battery is improved; because the two reduced-pitch grooved lines 4 are symmetrically arranged in the electrode hollow-out region 3, and the current carrier 5 is arranged between the two reduced-pitch grooved lines 4, the transmission distance of the current carrier 5 is shortened, the contact resistance of the current carrier 5 in the transmission process is reduced, and the capability of the electrode hollow-out region 3 for collecting the current carrier 5 is improved.

Specifically, fig. 3 is prior art, and comparing fig. 2 and fig. 3, the reduced pitch slotline 4 is not disposed in fig. 3, so that the carrier transmission path 51 is far away, which not only increases the contact resistance of the carrier 5 in the process of transmitting out, but also reduces the capability of the electrode hollow area 3 to collect the carrier 5.

Specifically, the grooving line 2 and the shrinkage grooving line 4 can be straight lines or line segments with a certain grooving duty ratio.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The PERC double-sided battery comprises a passivation film (1) arranged on the front surface and the back surface of a PERC battery silicon wafer, wherein a slotted line group and an electrode hollow area (3) are arranged on the passivation film (1), and the electrode hollow area (3) is vertically intersected with the slotted line group, and is characterized in that a telescopic slotted line group parallel to the PERC slotted line group is arranged in the electrode hollow area (3).

2. The PERC double sided battery according to claim 1, wherein said set of reduced pitch grooved lines comprises two reduced pitch grooved lines (4) symmetrically arranged along a vertical center line of the electrode routing area (3).

3. The PERC double sided battery according to claim 1, wherein said set of grooved lines comprises a plurality of grooved lines (2) uniformly distributed on the passivation film (1).