CN213093208U

CN213093208U - MWT solar cell back electrode structure and battery pack

Info

Publication number: CN213093208U
Application number: CN202022134181.0U
Authority: CN
Inventors: 范卫芳; 韩涵; 张鹤仙
Original assignee: Gsolar Power Co ltd
Current assignee: Gsolar Power Co ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-04-30
Anticipated expiration: 2030-09-25

Abstract

The utility model belongs to a solar cell electric connection structure, in particular to a MWT solar cell back electrode structure and a battery component, comprising a front electrode arranged on the light receiving surface of the MWT solar cell, a plurality of rows of front electrode contact points and back electrode contact points arranged on the back surface, wherein each row of front electrode contact points and each row of back electrode contact points are parallel to each other and alternate in sequence; the front electrode contact point is connected with the front electrode through the through hole; one row of the front electrode contact points of one solar cell is connected with one row of the back electrode contact points of the other solar cell through the same lead; the composite conductive film realizes the contact of the lead and the positive and negative electrodes through a laminating process and is pressed on the backlight surface of the MWT solar cell module. The MWT solar cell back electrode structure and the MWT solar cell back electrode assembly with the structure have the advantages that the shading on the front side is reduced, the short-circuit current is improved, and the conversion efficiency of the cell is improved; the manufacturing process is simpler and more convenient, a welding process and an expensive conductive back plate are not needed, and the cost is saved.

Description

MWT solar cell back electrode structure and battery pack

Technical Field

The utility model belongs to a solar cell electric connection structure, concretely relates to MWT solar cell back electrode structure and subassembly.

Background

The photoelectric conversion capability of the solar cell is in direct proportion to the light receiving area of the solar cell, the main grid of the conventional crystalline silicon solar cell occupies the space to cause shading, and the reduction of front shading is an effective way for improving the conversion efficiency of the solar cell. The MWT battery is characterized in that the positive electrode and the negative electrode of the battery are distributed on the back surface of the battery, and the main grids of the battery are uniformly distributed on the battery for realizing the optimal current collection effect, but the MWT battery cannot realize linear series welding due to the design. Therefore, how to use the conventional device technology to manufacture the MWT device becomes a difficult problem in the photovoltaic industry at present.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a MWT solar cell back electrode structure and assembly which uses a composite conductive film to realize the contact of a lead and positive and negative electrodes through a lamination process, which comprises that a plurality of positive electrodes are arranged on the light receiving surface of the MWT solar cell, a plurality of rows of positive electrode contact rows are arranged on the backlight surface of the MWT solar cell, a plurality of positive electrode contact points are respectively arranged on each row of positive electrode contact rows, and each positive electrode contact point is respectively connected with the positive electrode through a through hole; the back light surface of the MWT solar cell is also provided with a plurality of rows of back electrode contact rows, each row of back electrode contact rows is respectively provided with a plurality of back electrode contact points, and the back electrode contact rows and the front electrode contact rows are mutually parallel and are sequentially and alternately arranged; each row of back electrode contact rows comprises a plurality of groups of back electrode contact groups, each group of back electrode contact groups comprises two back electrode contact points, the position of each front electrode contact point is arranged between the back electrode contact points in each group of back electrode contact groups, the number of the back electrode contact points in each row is 2 times that of the front electrode contact points in the front electrode contact rows in the adjacent rows, and the front electrode contact points and the back electrode contact points are arranged independently; every two adjacent MWT solar cells are connected through the composite conductive film.

Preferably, the composite conductive film is composed of a composite adhesive film and a plurality of wires, wherein the wires are adhered to the composite adhesive film, and the composite conductive film is covered on the backlight surfaces of all interconnected MWT solar cells.

Further, a battery pack formed by the MWT solar cell back electrode structure is characterized in that: the solar cell comprises a plurality of MWT solar cells which are mutually connected, wherein in two adjacent MWT solar cells which are mutually connected, all front electrode contact points on one row of front electrode contact rows of one solar cell are connected with all back electrode contact points on one row of back electrode contact rows of the other solar cell through the same lead; the connecting direction of the lead wires flows from one front electrode contact row on one of the solar cells to one back electrode contact row on the other solar cell; the surface of the lead is covered with a composite adhesive film, and the composite adhesive film presses the lead on the backlight surface of the MWT solar cell module.

Preferably, the front electrode contact and the back electrode contact are both rectangular.

Preferably, the through-hole is provided at one end of the front electrode contact, and the other end is a welding end where the lead is welded to the front electrode contact.

Furthermore, the widths of the rectangular front electrode contact point and the rectangular back electrode contact point are respectively 0.2-5mm, and the lengths are respectively 0.4-20 mm.

Further, the conducting wire is a copper wire or an aluminum wire.

Further, the surface of the wire is coated with an alloy slurry coating, and the alloy slurry coating is a mixed material of one or more of tin, aluminum, silver, tin-lead alloy, tin-bismuth-silver alloy, tin-lead-silver alloy and tin-bismuth-lead alloy.

Further, the cross section of the wire is circular or elliptical or semicircular or rectangular or triangular.

Furthermore, the composite adhesive film is one or a combination of more of a POE film, an EVA film, a PVDF film or a PET film.

The utility model has the advantages that:

the emitter region and the base region electrodes of the MWT crystalline silicon solar cell are positioned on the back of the cell, so that shading on the front side is reduced, short-circuit current is improved, and the conversion efficiency of the cell is improved; in addition, the MWT component electrodes are all positioned on the back, no welding strip is arranged on the front side, and the component is more attractive in appearance; the solar cell module made of the MWT crystalline silicon solar cell and the composite conductive film is simpler and more convenient in manufacturing process, a welding process and an expensive conductive back plate are not needed, connection of the whole solar cell module and the n-divided solar cell module is facilitated, and cost is saved.

Drawings

FIG. 1 is a schematic diagram of the MWT cell backside structure;

FIG. 2 is a schematic view of a composite conductive film;

FIG. 3 is a schematic view of a straight series of MWT modules;

in the figure, 1 through hole, 2 back electrode contact points, 3 front electrode contact points, 4 conducting wires and 5 composite adhesive films.

Detailed Description

The utility model relates to a back electrode structure of an MWT solar battery, in particular to a back electrode structure of an integral MWT solar battery, wherein N rows of parallel back electrode contact rows are arranged on the back surface of the back electrode structure; each row of back electrode contact rows is provided with a plurality of back electrode contact points 2; the backlight surface of the LED display is also provided with N rows of front electrode contact rows which are arranged in parallel, each row of front electrode contact rows is respectively provided with a plurality of front electrode contact points 3, and each front electrode contact point 3 is respectively connected with a front electrode through a through hole 1; the back electrode contact row and the front electrode contact row are mutually parallel and are sequentially and alternately arranged; each row of back electrode contact rows comprises a plurality of groups of back electrode contact groups, each group of back electrode contact groups comprises two back electrode contact points 2, the position of each front electrode contact point 3 is arranged between the back electrode contact points 2 in each group of back electrode contact groups, the number of the back electrode contact points 2 in each row is 2 times of the number of the front electrode contact points 3 in the front electrode contact rows in the adjacent row, the front electrode contact points 3 and the back electrode contact points 2 are arranged independently, and every two adjacent MWT solar cells are connected through a composite conductive film.

As shown in fig. 1, a backlight surface of an MWT solar cell is provided with 4 rows of back electrode contact rows, each row of back electrode contact rows is provided with 8 back electrode contact points 2, meanwhile, the backlight surface of the MWT solar cell is also provided with 4 rows of front electrode contact rows, each row of front electrode contact rows is provided with 4 front electrode contact points 3, and the back electrode contact rows and the front electrode contact rows are parallel to each other and sequentially and alternately arranged on the backlight surface of the MWT solar cell; namely a row of back electrode contact rows, a row of front electrode contact rows are adjacently arranged, and so on. Each row of back electrode contact rows comprises 4 groups of back electrode contact groups, each group of back electrode contact groups comprises two back electrode contact points 2, and the position of each front electrode contact point 3 is arranged on a central line between the two back electrode contact points 2 in each group of back electrode contact groups; the front electrode contact point 3 and the back electrode contact point 2 are both rectangular, the width is 0.2-5mm, and the length is 0.4-20 mm; the through hole 1 is provided at one end of the front electrode contact point 3, and the other end is a welding end where the lead wire 4 is welded to the front electrode contact point 3.

As shown in fig. 3, when a plurality of MWT solar cells are connected, the arrangement direction of the MWT solar cells at the even number position is the direction of the MWT solar cells at the odd number position after horizontally rotating 180 °. If the 5 MWT solar cells are connected, wherein the 1 st, 3 rd and 5 th MWT solar cells are arranged in the above-mentioned directions, the 2 nd and 4 th MWT solar cells are arranged in the direction in which the 1 st, 3 rd or 5 th solar cells are horizontally rotated by 180 °. When 3 MWT solar cells are connected, the first row of the 1 st MWT solar cell is a back electrode contact row A1, the second row is a front electrode contact row A2, the third row is a back electrode contact row A3, and the fourth row is a front electrode contact row A4.; the first row of the 2 nd MWT solar cell is a front electrode contact row B1, the second row is a back electrode contact row B2, the third row is a front electrode contact row B3, and the fourth row is a back electrode contact row B4.; the first row of the 3 rd MWT solar cell is a back electrode contact row C1, the second row is a front electrode contact row C2, the third row is a back electrode contact row C3, the fourth row is a front electrode contact row C4.. so, B1 and C1 are connected through the same lead 4, A2 and B2 are connected through the same lead 4, B3 and C3 are connected through the same lead 4, A4 and B4 are connected through the same lead 4, and so on, B5 and C5 are connected through the same lead 4, A6 and B6 are connected through the same lead 4, B7 and C7 are connected through the same lead 4, A8 and B8 are connected through the same lead 4, and the composite adhesive film 5 is adhered to all leads 4 on the back of the MWT solar cell module.

The composite conductive film of the utility model consists of a composite adhesive film 5 and a plurality of leads 4, wherein the leads 4 are adhered on the composite adhesive film 5, and the composite conductive film is covered on the backlight surfaces of all interconnected MWT solar cells; the lead 4 is a copper wire or an aluminum wire, the surface of which is coated with an alloy slurry coating, and the alloy slurry coating is a mixed material of one or more of tin, aluminum, silver, tin-lead alloy, tin-bismuth-silver alloy, tin-lead-silver alloy and tin-bismuth-lead alloy; the section of the lead 4 is circular, elliptic, semicircular, rectangular or triangular; the composite adhesive film 5 is one or a combination of more of a POE film, an EVA film, a PVDF film or a PET film; the composite conductive film is fixed on the lower surface of the solar cell in a hot pressing mode, and the hot pressing mode can be contact type hot pressing or non-contact type hot pressing.

Claims

1. A MWT solar cell back electrode structure is characterized in that: the light receiving surface of the MWT solar cell is provided with a plurality of front electrodes, the backlight surface of the MWT solar cell is provided with a plurality of rows of front electrode contact rows, each row of front electrode contact rows is respectively provided with a plurality of front electrode contact points, and each front electrode contact point is respectively connected with a front electrode through a through hole; the back light surface of the MWT solar cell is also provided with a plurality of rows of back electrode contact rows, each row of back electrode contact rows is respectively provided with a plurality of back electrode contact points, and the back electrode contact rows and the front electrode contact rows are mutually parallel and are sequentially and alternately arranged; each row of back electrode contact rows comprises a plurality of groups of back electrode contact groups, each group of back electrode contact groups comprises two back electrode contact points, the position of each front electrode contact point is arranged between the back electrode contact points in each group of back electrode contact groups, the number of the back electrode contact points in each row is 2 times that of the front electrode contact points in the front electrode contact rows in the adjacent rows, and the front electrode contact points and the back electrode contact points are arranged independently; every two adjacent MWT solar cells are connected through the composite conductive film.

2. The MWT solar cell back electrode structure of claim 1, wherein: the composite conductive film is composed of a composite adhesive film and a plurality of leads, wherein the leads are adhered to the composite adhesive film, and the composite conductive film is covered on the backlight surfaces of all interconnected MWT solar cells.

3. A battery assembly, characterized by: comprising a MWT solar cell back electrode structure as claimed in claim 2, comprising a plurality of MWT solar cells connected to each other, wherein, in two adjacent MWT solar cells connected to each other, all the front electrode contacts on one of the rows of front electrode contacts of one solar cell are connected to all the back electrode contacts on one of the rows of back electrode contacts of the other solar cell by the same wire; the connecting direction of the lead wires flows from one front electrode contact row on one of the solar cells to one back electrode contact row on the other solar cell; the surface of the lead is covered with a composite adhesive film, and the composite adhesive film presses the lead on the backlight surface of the MWT solar cell module.

4. A battery assembly according to claim 3, wherein: the front electrode contact point and the back electrode contact point are both rectangular.

5. A battery pack according to claim 4, wherein: the through hole is arranged at one end of the front electrode contact point, and the other end of the through hole is a welding end of the lead welded with the front electrode contact point.

6. A battery pack according to claim 5, wherein: the widths of the rectangular front electrode contact point and the rectangular back electrode contact point are respectively 0.2-5mm, and the lengths of the rectangular front electrode contact point and the rectangular back electrode contact point are respectively 0.4-20 mm.

7. A battery assembly according to claim 6, wherein: the wire is copper wire or aluminum wire.

8. A battery assembly according to claim 7, wherein: the cross section of the lead is circular or elliptical or semicircular or rectangular or triangular.