CN210866216U

CN210866216U - IBC battery pack

Info

Publication number: CN210866216U
Application number: CN202020104522.7U
Authority: CN
Inventors: 朱加明; 周华明; 郭志球
Original assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Co Ltd
Current assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-06-26
Anticipated expiration: 2030-01-17

Abstract

The application discloses an IBC battery pack, which comprises a substrate, a first adhesive film layer, a battery sheet layer, a second adhesive film layer and a glass substrate which are sequentially stacked from bottom to top, wherein the battery sheet layer comprises a plurality of battery strings, and each battery string comprises a plurality of IBC batteries and a conductive pressure-sensitive adhesive tape for connecting adjacent IBC batteries; the conductive pressure-sensitive adhesive tape comprises a laminated base layer and a conductive pressure-sensitive adhesive layer, first electrodes and second electrodes which are arranged in parallel at intervals are distributed on the back surface of each IBC battery, the arrangement sequence of the first electrodes and the arrangement sequence of the second electrodes of adjacent IBC batteries are opposite, and the conductive pressure-sensitive adhesive layer is connected with the first electrodes and the second electrodes of the adjacent IBC batteries. The adjacent batteries are connected by the conductive pressure-sensitive adhesive tape, so that thermal stress cannot be generated, and the probability of hidden cracking or fragmentation can be reduced; when the conductive pressure-sensitive adhesive tape is hidden and cracked or broken, the conductive pressure-sensitive adhesive tape can be uncovered for repairing, and the method is simple, convenient and reliable; and is suitable for the development toward a thin battery.

Description

IBC battery pack

Technical Field

The application relates to the technical field of solar cells, in particular to an IBC cell module.

Background

An IBC (Interdigitated Back Contact) cell is a Back-junction Back-Contact solar cell structure in which positive and negative metal electrodes are arranged on the Back of the cell in an interdigital manner, and a PN junction of the solar cell structure is located on the Back of the cell. The front side of the battery is not shielded, so that the optical loss is reduced, the power generation efficiency is higher, and the battery is attractive and becomes a key point of research and development.

When the IBC batteries are connected in series in a conductive mode, the IBC batteries can be welded by using a traditional welding strip, and can also be packaged by using a conductive back plate. When the traditional welding strip is adopted, the welding is carried out at the high temperature of about 320-380 ℃, and the IBC battery is easily bent under the influence of stress generated by the high-temperature welding, so that hidden cracks or fragments are caused; the technology of packaging by using the conductive backboard is very complex, and is not favorable for repair and mass production.

Therefore, how to solve the above technical problems should be a great concern to those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The IBC battery component is used for reducing the situation that IBC batteries are hidden and cracked or broken in the IBC battery component and is convenient to repair once the IBC batteries are hidden and cracked or broken.

In order to solve the technical problem, the application provides an IBC battery assembly, which includes a substrate, a first adhesive film layer, a battery sheet layer, a second adhesive film layer, and a glass substrate, which are sequentially stacked from bottom to top, where the battery sheet layer includes a plurality of strings of battery strings, and each string of battery string includes a plurality of IBC batteries and a conductive pressure sensitive adhesive tape for connecting adjacent IBC batteries;

the conductive pressure sensitive adhesive tape comprises a laminated base layer and a conductive pressure sensitive adhesive layer, first electrodes and second electrodes which are arranged in parallel at intervals are distributed on the back surface of the IBC cell, the arrangement sequence of the first electrodes and the second electrodes adjacent to the IBC cell is opposite, and the conductive pressure sensitive adhesive layer is connected with the first electrodes and the second electrodes adjacent to the IBC cell.

Optionally, the first electrode and the second electrode are both segmented electrodes.

Optionally, the conductive pressure sensitive adhesive layer in the IBC cell assembly comprises any one of a conductive filler, an adhesive, a rubber, and a modified resin.

Optionally, the conductive filler in the IBC cell component is a silver filler or a copper filler.

Optionally, the first adhesive film layer and the second adhesive film layer are both EVA adhesive film layers or both POE adhesive film layers.

Optionally, the glass substrate is ultra-white patterned glass.

Optionally, the IBC battery is any one of a full IBC battery, a half IBC battery, and a trisection IBC battery.

Optionally, the substrate is a glass plate or a back plate.

The IBC battery pack comprises a substrate, a first adhesive film layer, a battery sheet layer, a second adhesive film layer and a glass substrate which are sequentially stacked from bottom to top, wherein the battery sheet layer comprises a plurality of battery strings, and each battery string comprises a plurality of IBC batteries and a conductive pressure-sensitive adhesive tape for connecting the adjacent IBC batteries; the conductive pressure sensitive adhesive tape comprises a laminated base layer and a conductive pressure sensitive adhesive layer, first electrodes and second electrodes which are arranged in parallel at intervals are distributed on the back surface of the IBC cell, the arrangement sequence of the first electrodes and the second electrodes adjacent to the IBC cell is opposite, and the conductive pressure sensitive adhesive layer is connected with the first electrodes and the second electrodes adjacent to the IBC cell.

Therefore, adjacent IBC batteries in the IBC battery assembly are connected through the conductive pressure sensitive adhesive tape without high-temperature welding, so that the IBC batteries are not subjected to thermal stress generated by welding, and the probability of hidden cracks or fragments of the IBC batteries is reduced; once hidden cracks or fragments appear, the conductive pressure-sensitive adhesive tape has viscosity, so that the conductive pressure-sensitive adhesive tape can be uncovered at any time for repair before the IBC battery component is laminated, the method is very simple, convenient and reliable, secondary use of the conductive pressure-sensitive adhesive tape cannot be influenced, and the method is suitable for mass production; meanwhile, the thickness of the IBC battery has no influence on the connection by using the conductive pressure sensitive adhesive tape, and the IBC battery is more suitable for the development of the IBC battery towards the direction of flaking.

Drawings

For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an IBC battery assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the structure of the IBC cell interconnect in the IBC cell assembly;

FIG. 3 is a schematic structural diagram of two adjacent IBC cells;

FIG. 4 is a schematic diagram of a half IBC cell interconnect;

FIG. 5 is a schematic diagram of a structure for trisecting IBC cell interconnections;

FIG. 6 is a schematic structural view of a conductive pressure sensitive adhesive tape;

in the figure: 1. the battery comprises a glass substrate, 2 parts of a second adhesive film layer, 3 parts of a battery sheet layer, 4 parts of a first adhesive film layer, 5 parts of a substrate, 6 parts of a first electrode, 7 parts of a second electrode, 31 parts of an IBC battery, 32 parts of a conductive pressure sensitive adhesive tape, 321 parts of a base layer and 322 parts of a conductive pressure sensitive adhesive layer.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 application.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As described in the background art, in the current IBC battery assembly, a solder strip or a conductive back plate is used to connect the IBC battery, when a conventional solder strip is used, the IBC battery needs to be welded at a high temperature of about 320 ℃ to 380 ℃, and the IBC battery is affected by stress generated by high-temperature welding and is easy to bend, thereby causing hidden cracks or fragments; the technology of packaging by using the conductive backboard is very complex, and is not favorable for repair and mass production.

In view of this, the present application provides an IBC battery assembly, please refer to fig. 1 and fig. 2, where fig. 1 is a schematic structural diagram of an IBC battery assembly provided in an embodiment of the present application, fig. 2 is a schematic structural diagram of IBC battery interconnection in an IBC battery assembly, the IBC battery assembly includes a substrate 5, a first adhesive film layer 4, a battery sheet layer 3, a second adhesive film layer 2, and a glass substrate 1, which are sequentially stacked from bottom to top, the battery sheet layer 3 includes a plurality of strings, each string includes a plurality of IBC batteries 31 and a conductive pressure sensitive adhesive tape 32 for connecting adjacent IBC batteries 31;

the conductive pressure sensitive adhesive tape 32 comprises a laminated base layer 321 and a conductive pressure sensitive adhesive layer 322, wherein first electrodes 6 and second electrodes 7 which are arranged in parallel at intervals are distributed on the back surface of the IBC cell 31, the arrangement sequence of the first electrodes 6 and the second electrodes 7 adjacent to the IBC cell 31 is opposite, and the conductive pressure sensitive adhesive layer 322 is connected to the first electrodes 6 and the second electrodes 7 adjacent to the IBC cell 31.

The IBC cell 31 in the IBC cell 31 assembly generally adopts an N-type silicon substrate, the region where the first electrode 6 is located is P-type heavily doped, the region where the second electrode 7 is located is N-type heavily doped, and in order to insulate the first electrode 6 and the second electrode 7 from each other, a passivation film of silicon oxide or silicon nitride is disposed on the back surface of the N-type silicon substrate.

In this embodiment, the first electrodes 6 and the second electrodes 7 of the adjacent IBC cells 31 are arranged in an opposite order, and the number of columns is the same, that is, at the same position of the adjacent IBC cells 31, one IBC cell 31 is the first electrode 6, and the other IBC cell 31 is the second electrode 7, as shown in fig. 3.

Optionally, in this embodiment, the IBC battery 31 is any one of a whole IBC battery 31, a half IBC battery 31, and a third IBC battery 31, and may also be a smaller IBC battery 31, such as a fourth IBC battery 31, a fifth IBC battery 31, and so on. When the IBC cell 31 is a half IBC cell 31 or a trisection IBC cell 31, please refer to fig. 4 and fig. 5 for the schematic diagram of the interconnection structure of the IBC cell 31.

It is to be noted that the specific types of the first electrode 6 and the second electrode 7 are not particularly limited in this embodiment, as the case may be. For example, when the first electrode 6 is a positive electrode, the second electrode 7 is a negative electrode; when the first electrode 6 is a negative electrode, the second electrode 7 is a positive electrode.

Referring to fig. 6, a schematic structural diagram of the conductive pressure sensitive adhesive tape 32 is shown, wherein the conductive pressure sensitive adhesive layer 322 in the IBC cell 31 assembly includes any one of conductive filler, adhesive, rubber and modified resin; the substrate layer 321 is a PET (polyethylene terephthalate) film layer. The PET film layer is very thin and melts at a temperature of 140 c to 150 c, thereby allowing conduction between adjacent IBC cells 31.

Note that, in this embodiment, the kind of the modified resin is not particularly limited, and may be set by itself. For example, the modified resin may be an acrylic system modified resin, or a silicone epoxy system modified resin.

Further, the conductive filler in the IBC cell 31 assembly is silver filler or copper filler, or silver-coated nickel filler, etc.

Preferably, the first electrode 6 and the second electrode 7 are both segmented electrodes, so that the use amount of silver paste can be reduced, and the cost is reduced.

Optionally, the first adhesive film layer 4 and the second adhesive film layer 2 are both EVA (Ethylene vinyl acetate) adhesive film layers or POE (Ethylene-vinyl acetate) adhesive film layers.

In the embodiment, adjacent IBC cells 31 in the IBC cell 31 assembly are connected by the conductive pressure sensitive adhesive tape 32 without high-temperature welding, so that the IBC cells 31 are not subjected to thermal stress caused by welding, and the probability of subfissure or fragmentation of the IBC cells 31 is reduced; once hidden cracks or fragments appear, the conductive pressure sensitive adhesive tape 32 has viscosity, so that the conductive pressure sensitive adhesive tape 32 can be uncovered at any time for repair before the IBC battery 31 component is laminated, the method is very simple, convenient and reliable, secondary use of the conductive pressure sensitive adhesive tape 32 cannot be influenced, and the method is suitable for mass production; meanwhile, the thickness of the IBC cell 31 has no influence on connection using the conductive pressure sensitive adhesive tape 32, and is more suitable for the IBC cell 31 to be developed toward the direction of thinning.

On the basis of any one of the above-mentioned embodiments, in an embodiment of this application, glass substrate 1 is super white figured glass, and super white figured glass has the characteristics that the luminousness is high, the reflectivity is low, can increase the quantity that solar ray sees through glass substrate 1 to increase the quantity that the battery layer absorbed light, promote the photoelectric conversion efficiency of IBC battery 31 subassembly. However, the present embodiment is not limited thereto, and in another embodiment of the present application, the glass substrate 1 may also be tempered glass.

On the basis of any of the above embodiments, in an embodiment of the present application, the substrate 5 is a glass plate or a back plate. Specifically, when IBC battery 31 subassembly is single glass assembly, base plate 5 is the backplate, and when IBC battery 31 subassembly was dual glass assembly, base plate 5 was the glass board. Further, in the present embodiment, the material of the back plate is not particularly limited, and may be determined as the case may be. For example, the backplane may be a structural backplane such as TPT, TPE, KPE, etc.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The IBC battery pack and the method of manufacturing the IBC battery pack provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. An IBC battery pack is characterized by comprising a substrate, a first adhesive film layer, a battery sheet layer, a second adhesive film layer and a glass substrate which are sequentially stacked from bottom to top, wherein the battery sheet layer comprises a plurality of battery strings, and each battery string comprises a plurality of IBC batteries and a conductive pressure-sensitive adhesive tape for connecting the adjacent IBC batteries;

2. The IBC cell assembly of claim 1, wherein the first electrode and the second electrode are both segmented electrodes.

3. The IBC cell assembly of claim 1, wherein the electrically conductive pressure sensitive adhesive layer in the IBC cell assembly comprises any one of a conductive filler, an adhesive, a rubber, and a modified resin.

4. The IBC cell assembly of claim 3, wherein the conductive filler in the IBC cell assembly is a silver filler or a copper filler.

5. The IBC cell assembly of claim 1, wherein the first and second adhesive film layers are both EVA adhesive film layers or both POE adhesive film layers.

6. The IBC cell assembly of claim 1, wherein the glass substrate is ultra-white patterned glass.

7. The IBC cell assembly of claim 1, wherein the IBC cell is any one of a full IBC cell, a half IBC cell, a trisected IBC cell.

8. The IBC cell assembly of any one of claims 1 to 7, wherein the substrate is a glass plate or a backsheet.