CN215869424U

CN215869424U - MWT-HJT battery pack structure

Info

Publication number: CN215869424U
Application number: CN202120864331.5U
Authority: CN
Inventors: 王伟; 吴仕梁; 张凤鸣
Original assignee: Jiangsu Sunport Power Corp Ltd
Current assignee: Jiangsu Sunport Power Corp Ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2022-02-18
Anticipated expiration: 2031-04-26

Abstract

The utility model discloses an MWT-HJT battery component structure which sequentially comprises glass, a front packaging adhesive film, a battery piece, a first back conductive foil, a back isolating film, a back conductive adhesive, a second back conductive foil and a back plate from top to bottom, wherein the battery piece is structurally composed of a front TCO layer, a front doped amorphous silicon layer, a front intrinsic amorphous silicon layer, a monocrystalline silicon substrate, a back intrinsic amorphous silicon layer, a back doped amorphous silicon layer and a back TCO layer from top to bottom. Compared with the back low-temperature silver paste of the common HJT battery, the utility model is realized by packaging the low-cost aluminum foil at the assembly section at one time, simplifies the process flow of the battery preparation section, and saves one printing and one drying.

Description

MWT-HJT battery pack structure

Technical Field

The utility model relates to an MWT-HJT battery component structure, and belongs to the technical field of solar cell production.

Background

The MWT battery technology is a back contact technology, compared with an IBC structure, the technology is simple and low in cost, the MWT battery technology is combined with the HJT battery technology, on one hand, the advantages of the HJT battery can be exerted, on the other hand, the technical characteristics of the MWT battery and the unique back contact component packaging mode of the MWT battery can be perfectly combined with the HJT battery and can further exert the sheet advantages of the MWT battery, and the cost of the MWT-HJT battery component product can be greatly reduced through the innovative design of the battery back surface structure and the innovative design of the back surface component packaging technology.

SUMMERY OF THE UTILITY MODEL

The utility model combines the MWT and the HJT battery technologies, fully exerts the packaging advantage of the full back assembly of the MWT battery, develops a brand new battery assembly structure, simplifies the process, reduces the silver paste consumption of the battery, greatly reduces the cost and is beneficial to the industrialization of the HJT battery.

The utility model relates to an MWT-HJT battery component structure which sequentially comprises glass, a front packaging adhesive film, a battery piece, a first back conductive foil, a back isolating film, a back conductive adhesive, a second back conductive foil and a back plate from top to bottom, wherein the battery piece is structurally composed of a front TCO layer, a front doped amorphous silicon layer, a front intrinsic amorphous silicon layer, a monocrystalline silicon substrate, a back intrinsic amorphous silicon layer, a back doped amorphous silicon layer and a back TCO layer from top to bottom.

Further, the first back conductive foil and the second back conductive foil are the same or different in composition and are copper foil, aluminum foil or a composite foil of the copper foil and the aluminum foil.

Further, the front amorphous silicon layer is an N-type amorphous silicon layer or a P-type amorphous silicon layer.

Further, if the front surface adopts a P-type amorphous silicon layer, the back amorphous silicon layer is an N-type amorphous silicon deposition layer; if the front surface adopts the N-type amorphous silicon layer, the back amorphous silicon layer is a P-type amorphous silicon deposition layer.

Furthermore, the assembly structure is formed by connecting a plurality of battery pieces in series, the battery pieces are connected in series on the back surfaces of the battery pieces through a first back surface conductive foil, and a back surface conductive paste dot matrix is arranged on the first back surface conductive foil.

Furthermore, the front electrode of the cell is silk-screen low-temperature silver paste, and the front electrode is gathered and penetrates to the back through holes prepared on the silicon wafer before texturing; the back electrode is an aluminum film, and the anode and the cathode on the back are insulated and isolated.

Compared with the traditional MWT battery, the MWT-HJT battery component structure provided by the utility model has the following beneficial effects:

1. the high efficiency, low attenuation and low temperature coefficient of the HJT battery are provided, and the comprehensive generating capacity is improved;

2. MWT and HJT both have the advantages of flaking, can be compatible with a silicon wafer with the thickness of 100 microns, and further reduce the cost;

3. compared with the HJT battery, the metallization of the low-temperature silver paste on the back surface is omitted, the metallization is integrated to the component packaging stage, and meanwhile, the lower-cost aluminum foil is adopted for one-step packaging and forming.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the present invention will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.

FIG. 1 is a schematic view of a MWT-HJT cell structure according to the present invention;

FIG. 2 is a schematic view of a MWT-HJT cell module according to the present invention;

in the figure, 1-silicon chip, 2-intrinsic amorphous silicon layer, 3-N type doped amorphous silicon layer, 4-P type amorphous silicon layer, 5-TCO layer, 6-front electrode, 7-hole blocking slurry, 8-back conductive slurry dot matrix, 9-first back conductive foil, 10-back conductive adhesive, 11-second back conductive foil, 12-back isolation film, 13-front packaging adhesive film, 14-glass, 15-back plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

Example 2

This embodiment also provides a method for manufacturing the above battery assembly, where the above MWT-HJT battery structure is adopted in the battery assembly, and the method includes the following steps:

s101, sequentially laying a back plate, a first back conductive foil, a back conductive adhesive, a back isolating film, a second back conductive foil, a back conductive adhesive dot matrix, an MWT-HJT battery piece, a front packaging adhesive film and glass;

s102, entering an assembly laminating machine for assembly packaging.

This battery pack manufacturing process only accomplishes the front electrode and the cavity inner pulp runs through at the battery end, the front electrode is silk screen printing low temperature silver thick liquid, regard as the stifled hole thick liquid with another kind of metal conducting resin simultaneously, through the hole of preparation on the silicon chip before the system fine hair, assemble and run through to the back, back electrode is at the subassembly encapsulation process, it forms to glue the aluminium foil on back TCO through the conducting paste dot matrix, there is insulating isolation between the positive negative pole at the back, compare in the back low temperature silver thick liquid of ordinary HJT battery, the utility model discloses another way has been opened up, once the encapsulation is realized at the subassembly section through cheap aluminium foil, the process flow of battery preparation section has been simplified, one printing has been lacked, one is dried.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The MWT-HJT battery component structure is characterized by sequentially comprising glass, a front packaging adhesive film, a battery piece, a first back conductive foil, a back isolating film, a back conductive adhesive, a second back conductive foil and a back plate from top to bottom, wherein the battery piece is sequentially provided with a front TCO layer, a front doped amorphous silicon layer, a front intrinsic amorphous silicon layer, a monocrystalline silicon substrate, a back intrinsic amorphous silicon layer, a back doped amorphous silicon layer and a back TCO layer from top to bottom.

2. The MWT-HJT cell module structure of claim 1, wherein the first backside conductive foil and the second backside conductive foil are of the same composition or different compositions, and are copper foil, aluminum foil, or a composite foil of the two.

3. The MWT-HJT cell module structure of claim 1, wherein the front intrinsic amorphous silicon layer is an N-type amorphous silicon layer or a P-type amorphous silicon layer.

4. The MWT-HJT cell module structure of any one of claims 1 to 3, wherein if a P-type amorphous silicon layer is used for the front surface, the back amorphous silicon layer is an N-type amorphous silicon deposition layer; if the front surface adopts the N-type amorphous silicon layer, the back amorphous silicon layer is a P-type amorphous silicon deposition layer.

5. The assembly structure of claim 4, wherein the assembly structure comprises a plurality of cells connected in series, the cells are connected in series on the back side of the cells through a first back conductive foil, and a back conductive paste dot matrix is disposed on the first back conductive foil.

6. The MWT-HJT battery pack structure of claim 5, wherein the front electrode of the battery piece is silk-screen low temperature silver paste, and is gathered and penetrated to the back through the holes prepared on the silicon chip before texturing; the back electrode is an aluminum film, and the anode and the cathode on the back are insulated and isolated.