Non-main-grid battery interconnection structure and battery assembly

Abstract

The utility model discloses a main-grid-free battery interconnection structure and a battery assembly, the main-grid-free battery interconnection structure comprises battery pieces and a solder strip, a composite film is arranged between two adjacent battery pieces, two sides of the composite film respectively extend to the front edge and the back edge of the opposite ends of the two adjacent battery pieces, the middle part of the composite film is provided with a through hole, and the solder strip is arranged in the through hole. The solder strip passes through the through hole, and two ends of the solder strip respectively extend to the front and back surfaces of two adjacent cells. The cells, the solder strip and the composite film are hot-pressed together. According to the utility model, the solder strips penetrate through the through holes of the composite films to form the solder strip composite film connecting string, and the composite films are only used at the joints of the battery pieces, so that the use amount of the composite films is reduced, and the cost is reduced; the shielding of the battery piece is greatly reduced, and the power generation power of the battery assembly is improved; the battery piece, the welding strip and the composite film connecting string form a series structure through hot pressing, interconnection test can be carried out on the battery string before the battery assembly is laminated, and detection and timely repair are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of crystalline silicon solar cell module, concretely to a kind of main grid-free cell interconnection structure and battery module. BACKGROUND

[0002] Crystalline silicon solar cell electrode includes main grid and vice grid, and vice grid line is used to collect photo-generated carrier, and main grid line is used to collect and connect in series Current. Crystalline silicon cell piece grid line technology has experienced 4BB, 5BB, MBB to SMBB again to 0BB technology innovation, and 0BB main grid-free technology cancels main grid on cell piece, and only vice grid is retained, and cell piece is gathered by solder strip vice grid current and realizes cell interconnection, with the advantages of reducing production cost, improving power, improving yield etc.

[0003] At present, 0BB main grid-free technology mainly has SmartWire, dispensing, welding plus dispensing, film coating process etc. Among them, film coating process is to use the self-adhesion of adhesive film to bond and connect in series cell piece and solder strip, and uses modified EVA, POE, PVB adhesive film, also called skin film, to stack cell piece, solder strip and skin film in sequence, to complete the connection of cell piece, solder strip and adhesive film by laminating process at one time. This method needs to use skin film, on the one hand, the cost of skin film is high, the grammage is low, the shrinkage rate is large, the process is unstable, on the other hand, the front of cell piece is shielded by one more adhesive film, the light transmittance is reduced, which affects the power of battery module; at the same time, this method needs to form the contact between cell piece and solder strip after laminating, which is not convenient for detecting cell string before laminating and repairing cell string with problems in detection, and has defects. UTILITY MODEL CONTENTS

[0004] In view of the defects in the prior art, the utility model provides a main grid-free cell interconnection structure and battery module to solve the problems of high cost, unstable process, affecting power, not convenient for detecting cell string before laminating and repairing cell string with problems in detection of existing 0BB main grid-free cell.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] A main grid-free cell interconnection structure, comprising cell piece and solder strip, composite film is arranged between adjacent two cell pieces, the opposite ends of the composite film extend to the front edge and back edge of the adjacent two cell pieces respectively, the middle part of the composite film is provided with perforation, and the solder strip penetrates through the perforation and extends to the front and back of the adjacent two cell pieces at both ends respectively, and the cell piece, solder strip and composite film are hot-pressed together.

[0007] Preferably, the composite film comprises substrate and adhesive layer sprayed on the front and back of the substrate.

[0008] Preferably, the substrate is a PET, PP or PC film, and the adhesive layer is an acrylic resin layer.

[0009] Preferably, the thickness of the substrate is 50-100 μm, and the thickness of the adhesive layer is 20-50 μm.

[0010] A busbar-free battery module includes a busbar-free battery interconnection structure, the front and back surfaces of which are provided with a front plate and a back plate respectively, and the battery piece and the front plate are laminated by an encapsulation adhesive film, a solder strip, a composite film and the front plate, and the battery piece and the back plate are laminated by an encapsulation adhesive film, a solder strip, a composite film and the back plate.

[0011] Compared with the prior art, the utility model has the advantages of:

[0012] The utility model discloses a welding strip and composite film through-hole connection form welding strip composite film connection string, compared with the prior art's whole skin film, only uses composite film at the battery piece connection, reduces the amount of composite film, reduces the cost, greatly reduces the shielding to the battery piece, improves the power generation of battery module, replaces the skin film by the composite film, ensures the process stability, avoids the adverse problem of the shrinkage of skin film during laminating in the prior art, the battery piece and welding strip and composite film connection string form the series connection structure through hot pressing, can carry out interconnection test to the battery string before the laminating of battery module, is convenient for detection and is convenient for timely repair, reduces the workload of repair, solves the problems of high cost, unstable process, influence power, inconvenient detection of battery string before laminating and repair of the battery string with the problem of detection in the prior art 0BB busbar-free battery. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the busbar-free battery interconnection structure schematic diagram of the utility model;

[0014] Figure 2 It is the busbar-free battery module structure schematic diagram of the utility model;

[0015] Figure 3 It is the welding strip and composite film plan view of the utility model;

[0016] Figure 4 It is the composite film section view of the utility model.

[0017] In the drawing: 1, battery piece; 2, welding strip; 3, composite film; 31, substrate; 32, adhesive layer; 4, through-hole; 5, front plate; 6, back plate; 7, encapsulation adhesive film. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0019] As shown in the drawings, Figures 1-4 The utility model provides a kind of technical scheme: a kind of main gridless battery interconnection structure, including cell piece 1 and solder strip 2, two adjacent cell piece 1 between being provided with composite film 3, two sides of composite film 3 respectively extend to the front edge and back edge of the opposite end of two adjacent cell piece 1, the middle part of composite film 3 is provided with perforation 4, solder strip 2 penetrates perforation 4 and two ends respectively extend to the front and back of two adjacent cell piece 1, cell piece 1, solder strip 2 and composite film 3 are hot-pressed together;

[0020] Composite film 3 includes substrate 31 and adhesive layer 32 sprayed on the front and back of substrate 31, substrate 31 is PET, PP or PC film, adhesive layer 32 is acrylic resin layer, the thickness of substrate 31 is 50-100 μm, the thickness of adhesive layer 32 is 20-50 μm, and the thickness of composite film 3 is preferably 100-150 μm;

[0021] A main gridless battery assembly includes a main gridless battery interconnection structure, and front plate 5 and back plate 6 are arranged on the front and back of the main gridless battery interconnection structure respectively, cell piece 1 and front plate 5 are laminated by encapsulation adhesive film 7, cell piece 1, solder strip 2, composite film 3 and front plate 5, and cell piece 1 and back plate 6 are laminated by encapsulation adhesive film 7, cell piece 1, solder strip 2, composite film 3 and back plate 6.

[0022] It should be noted that in this document, terms such as "comprise", "include", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles, or devices.

[0023] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A mainless grid cell interconnection structure comprising a cell sheet (1) and a solder strip (2), characterized in that: The two adjacent battery pieces (1) are provided with a composite film (3), the two sides of the composite film (3) extend to the front edge and back edge of the opposite ends of the two adjacent battery pieces (1) respectively, the middle part of the composite film (3) is provided with a perforation (4), the welding strip (2) penetrates through the perforation (4) and extends to the front and back of the two adjacent battery pieces (1) respectively, and the battery piece (1), the welding strip (2) and the composite film (3) are hot-pressed together.

2. The interconnection structure of a cell without main grid and the cell assembly according to claim 1, characterized in that: The composite film (3) comprises a substrate (31) and an adhesive layer (32) sprayed on the front and back of the substrate (31).

3. The interconnection structure of a cell without main grid and the cell assembly according to claim 2, characterized in that: The substrate (31) is a PET, PP or PC film, and the adhesive layer (32) is an acrylic resin layer.

4. The interconnection structure of a cell without main grid and the cell assembly according to claim 3, characterized in that: The thickness of the substrate (31) is 50-100 μm, and the thickness of the adhesive layer (32) is 20-50 μm.

5. A solar cell module without a main grid, characterized by: The front and back of the interconnection structure of the battery piece without main grid as claimed in any one of claims 1-4 are provided with a front plate (5) and a back plate (6) respectively, the battery piece (1) and the front plate (5) are laminated by encapsulation adhesive film (7) to form the battery piece (1), the welding strip (2), the composite film (3) and the front plate (5), and the battery piece (1) and the back plate (6) are laminated by encapsulation adhesive film (7) to form the battery piece (1), the welding strip (2), the composite film (3) and the back plate (6).

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