CN110518082B - Battery piece group, photovoltaic module and photovoltaic equipment - Google Patents

Abstract

The present application provides a battery cell group, including: a multi-layer battery group connected by a bus bar, an inter-group packaging layer is arranged between adjacent battery groups, and the stacking arrangement of all battery groups is staggered so that there is no gap and no overlap between the battery cells after all battery groups are stacked; each layer of battery group includes multiple battery strings, and adjacent battery strings are connected by bus bars; the distance between adjacent battery cells in each battery string is a preset number of battery cell sizes, and adjacent battery cells are connected by welding strips. The battery group of the present application includes multiple battery strings, and the distance between adjacent battery cells in the battery string is a preset number of battery cell sizes. Multiple battery groups are staggered to form a surface-free structure, which maximizes the use of the light-receiving surface of the battery cell. In a certain packaging size, more battery cells can be packaged, thereby increasing the output power of the component. The present application also provides a photovoltaic component and a photovoltaic device, both of which have the above-mentioned beneficial effects.

Description

A battery cell group, photovoltaic module and photovoltaic device

Technical Field

The present application relates to the field of photovoltaic technology, and in particular to a battery cell group, a photovoltaic module and a photovoltaic device.

Background Art

For conventional photovoltaic module structures, the structure from top to bottom is upper glass, upper packaging material, battery cells, lower packaging material, lower backplane or lower glass. In conventional module structures, there is a certain spacing between the battery cells in each string, which will cause the light-receiving surface of the module to be unable to be fully utilized, increasing the module packaging loss.

Therefore, how to provide a solution to the above technical problems is a problem that technical personnel in this field need to solve at present.

Summary of the invention

The purpose of this application is to provide a cell group, a photovoltaic module and a photovoltaic device, which can reduce the packaging area loss and improve the module power output. The specific scheme is as follows:

The present application provides a battery cell group, comprising:

A multi-layer battery pack connected by bus bars, wherein an inter-packaging layer is provided between adjacent battery packs, and the stacking arrangement of all the battery packs is staggered so that there is no gap and no overlap between the battery cells after the battery packs are stacked;

Each layer of the battery pack includes a plurality of battery strings, and adjacent battery strings are connected by bus bars;

The distance between adjacent battery cells in each battery string is a preset number of battery cell sizes, and adjacent battery cells are connected by welding strips.

Optionally, in each of the battery groups, the second battery string is arranged in a staggered manner on the side of the first battery string, wherein the side is an edge parallel to the arrangement direction of the battery cells in the first battery string, and the first battery string and the second battery string are adjacent battery strings.

Optionally, the distance between adjacent battery cells in each battery string is the size of one battery cell.

Optionally, the number of the battery packs is two.

Optionally, the cell size of the cell is any one of 1/2, 1/3, 1/4, 1/5, and 1/6 of that of a conventional cell.

The present application provides a photovoltaic module, comprising:

An upper layer of glass, a first encapsulation layer, a battery cell group as described above, a second encapsulation layer, a lower backplane or a lower layer of glass.

Optionally, the first encapsulation layer, the second encapsulation layer, and the inter-group encapsulation layer are all POE or EVA.

Optionally, when the battery cell is a single-sided battery cell, the lower backplane is a non-transparent packaging backplane or a transparent packaging backplane.

The present application provides a photovoltaic device, including the photovoltaic component as described above.

The present application provides a battery cell group, including: a multi-layer battery group connected by a bus bar, an inter-group packaging layer is arranged between adjacent battery groups, and the stacking arrangement of all battery groups is staggered so that there are no gaps and no overlaps between the battery cells after all battery groups are stacked; each layer of battery group includes multiple battery strings, and adjacent battery strings are connected by bus bars; the distance between adjacent battery cells in each battery string is a preset number of battery cell sizes, and adjacent battery cells are connected by welding strips.

It can be seen that the battery pack of the present application includes multiple battery strings, and the distance between adjacent battery cells in the battery string is a preset number of battery cell sizes. Multiple battery packs are staggered to form a surface structure with no gaps and no overlap, thereby maximizing the use of the light-receiving surface of the battery cell. More battery cells can be packaged in a certain packaging size, thereby improving the output power of the component.

The present application also provides a photovoltaic module and a photovoltaic device, both of which have the above-mentioned beneficial effects, which will not be described in detail here.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

FIG1 is a schematic structural diagram of a battery cell group provided in an embodiment of the present application;

FIG2 is a schematic diagram of the structure of a battery string provided in the present application;

FIG3 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of another battery pack provided in an embodiment of the present application;

FIG5 is a schematic diagram of a structure of a stacked battery pack provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a first battery pack provided in an embodiment of the present application;

FIG7 is a schematic diagram of the structure of a second battery pack provided in an embodiment of the present application;

FIG8 is a schematic diagram of the structure of a third battery pack provided in an embodiment of the present application;

FIG9 is a schematic diagram of a structure of a stacked battery pack provided in an embodiment of the present application;

FIG10 is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present application;

FIG. 11 is a schematic diagram of the structure of another photovoltaic module provided in an embodiment of the present application.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

For conventional photovoltaic module structures, the structure from top to bottom is upper glass, upper packaging material, battery cells, lower packaging material, lower backplane or lower glass. In conventional module structures, a certain spacing between battery cells in each string is left, which will cause the light-receiving surface of the module to be unable to be fully utilized, increasing the module packaging loss. Based on the above technical problems, this embodiment provides a photovoltaic module, the battery pack 100 includes a plurality of battery strings, the distance between adjacent battery cells in the battery string is a preset number of battery cell sizes, and the plurality of battery packs 100 are staggered to form a gap-free structure, which maximizes the use of the light-receiving surface of the module and reduces the module packaging loss. Therefore, in a certain packaging size, more battery cells can be packaged, thereby increasing the module output power. Please refer to Figure 1, which is a schematic diagram of the structure of a battery cell group provided in an embodiment of the present application, including:

The multi-layer battery packs 100 (100-1 to 100-n) are connected by bus bars. Adjacent battery packs 100 are provided with inter-group packaging layers 200 (200-1 to 200-(n-1)). The upper and lower combinations of all battery packs 100 are arranged in a staggered manner so that there are no gaps and no overlaps between the battery cells after all battery packs are stacked; each layer of battery packs has more than 100 battery strings, and adjacent battery strings are connected by bus bars; the distance between adjacent battery cells in each battery string is a preset number of battery cell sizes, and adjacent battery cells are connected by welding strips.

It is understandable that in this embodiment, multiple cells form a battery string, multiple battery strings form a battery pack, and multiple battery packs are stacked to form a photovoltaic module. This embodiment does not limit the number of cells, battery strings, and battery packs, and users can customize the settings.

Among them, the encapsulation material corresponding to the inter-group encapsulation layer 200 has a large resistivity, which will not cause the upper and lower battery groups 100 to short-circuit. Secondly, the use of the inter-group encapsulation layer 200 can better fix the battery strings in the battery group 100, and the encapsulation material is indispensable. Among them, the structure formed by the staggered arrangement is that all battery groups 100 will not overlap after being stacked up and down, and there is no gap structure on the surface after the upper and lower battery groups 100 are stacked. In a certain packaging size, while maximizing the use of battery cells, more battery cells can be packaged in a certain packaging size to increase the output power of the component. This embodiment no longer limits the welding strip and bus bar. Please refer to the relevant technology for details. This embodiment will not be repeated. When the battery group 100 is stacked, the two battery strings on the upper and lower sides of all inter-group encapsulation layers are staggered, so that there is no gap on the surface of the final photovoltaic module. This embodiment does not limit the number of battery groups in the battery group, which can be 2, 3 or 4, and the user can customize the setting. It is worth noting that the larger the number of battery groups, the higher the packaging cost. Therefore, preferably, the number of battery groups is 2 or 3.

In an achievable implementation, in each battery pack, the first battery string is arranged sideways with the second battery string, wherein the side is an edge parallel to the arrangement direction of the battery cells in the first battery string, and the first battery string and the second battery string are adjacent battery strings. The distance between the battery strings can be eliminated by staggered arrangement between the battery strings, and further a seamless arrangement can be achieved.

This embodiment does not limit the distance between adjacent battery cells in the battery string, as long as the purpose of this embodiment can be achieved. It can be understood that when the number of battery packs is 2, the distance between battery cells is 1 battery cell size; when the number of battery packs is 3, the distance between battery cells is 2 battery cell sizes; when the number of battery packs is 4, the distance between battery cells is 3 battery cell sizes. In the battery pack formed in this form, the upper and lower combination arrangement of the battery packs 100 is staggered, and there is no gap between the battery cells between the total battery strings of each string formed by superposition. For example, when the number of battery packs is 2, the battery string welding method is to weld two battery cells with a battery cell gap between them, and so on, until a string is welded; in the first battery pack, the arrangement of the battery cells in the first battery string is 1-0-1-0-1-0-1-0-1-0-1-0, the arrangement of the battery cells in the second battery string is 0-1-0-1-0-1-0-1-0-1-0-1, the arrangement of the battery cells in the third battery string is 1-0-1-0-1-0-1-0-1-0-1-0, and the arrangement of the battery cells in the fourth battery string is 0-1-0-1-0-1-0-1-0-1-0-1, The arrangement of the battery cells in the fifth battery string is 1-0-1-0-1-0-1-0-1-0-1-0, and the arrangement of the battery cells in the sixth battery string is 0-1-0-1-0-1-0-1-0-1-0-1; in the second battery group, the arrangement of the battery cells in each battery string is 0-1-0-1-0-1-0-1-0-1-0-1, in the second battery group, the arrangement of the battery cells in the first battery string is 1-0-1-0-1-0-1-0-1-0-1-0, the arrangement of the battery cells in the second battery string is 1-0-1-0-1-0-1-0-1-0-1-0-1, and the arrangement of the battery cells in the third battery string is 0-1-0-1-0-1-0-1-0-1-0-1, the arrangement of the battery cells in the fourth battery string is 1-0-1-0-1-0-1-0-1-0-1-0, the arrangement of the battery cells in the fifth battery string is 0-1-0-1-0-1-0-1-0-1-0-1, and the arrangement of the battery cells in the sixth battery string is 1-0-1-0-1-0-1-0-1-0-1-0-1-0; therefore, a surface-free structure is formed by superposition of the first battery group and the second battery group. For details, please refer to FIG. 2, which is a schematic diagram of the structure of the battery string provided by the present application. The battery cells (111a-111f) form a battery string 111. For the misaligned Please refer to Figure 3 for the arrangement of the battery packs, which is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application. Correspondingly, please refer to Figure 4 for the structure of the second battery pack, which is a schematic diagram of the structure of another battery pack provided in an embodiment of the present application. Therefore, please refer to Figure 5 for the image of the battery packs after superposition, which is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application after superposition. It can be seen that two battery cells in the same battery string are welded after a gap of the size of the battery cell is separated, that is, interval welding; when the battery strings are arranged, the battery strings on the same layer of the inter-group packaging layer are arranged on the same plane along an edge; the two opposite battery strings on the upper and lower inter-group packaging layers are arranged in a staggered manner. Further avoiding the high packaging loss in the prior art, reducing the component packaging loss, more battery cells can be packaged in a certain packaging size, and the output power of the component is improved. Of course, when the number of battery packs is 2, in the first battery pack, the arrangement of the battery cells in each battery string is 1-0-1-0-1-0-1-0-1-0-1-0, and in the second battery pack, the arrangement of the battery cells in each battery string is 0-1-0-1-0-1-0-1-0-1-0-1.

When the number of battery groups is 3, the arrangement of the battery cells in the first battery string of the first battery group is 0-0-1-0-0-1-0-0-1, the arrangement of the battery cells in the second battery string is 1-0-0-1-0-0-1-0-0, the arrangement of the battery cells in the third battery string is 0-1-0-0-1-0-0-1-0, the arrangement of the battery cells in the fourth battery string is 1-0-0-1-0-0-0-1-0-0, the arrangement of the battery cells in the fifth battery string is 1-0-0-1-0-0-1-0-0, the arrangement of the battery cells in the sixth battery string is 0-1-0-0-0-1-0-0-1-0, the arrangement of the battery cells in the seventh battery string is 0-0-1-0-0-0-1-0-0-1, and the arrangement of the battery cells in the eighth battery string is 0-0-1-0-0-0-1-0-0-1. The arrangement of the batteries in the ninth battery string is 0-1-0-0-1-0-0-0-1-0; the arrangement of the batteries in the first battery string of the second battery group is 1-0-0-1-0-0-0-1-0-0 (1 represents a battery cell, and 0 represents a battery cell size), the arrangement of the batteries in the second battery string is 0-1-0-0-1-0-0-0-1-0, the arrangement of the batteries in the third battery string is 0-0-1-0-0-0-1-0-0-1, the arrangement of the batteries in the fourth battery string is 1-0-0-1-0-0-0-1-0-0, the arrangement of the batteries in the fifth battery string is 0-1-0-0-0-1-0-0-1-0, and the arrangement of the batteries in the sixth battery string is 0-0- 1-0-0-1-0-0-1, the arrangement of the battery cells in the seventh battery string is 1-0-0-1-0-0-1-0-0, the arrangement of the battery cells in the eighth battery string is 0-1-0-0-1-0-0-0-1-0, and the arrangement of the battery cells in the ninth battery string is 0-0-1-0-0-0-1-0-0-1; the arrangement of the battery cells in the first battery string of the third battery group is 0-1-0-0-1-0-0-0-1-0, the arrangement of the battery cells in the second battery string is 0-0-1-0-0-0-1-0-0-1, the arrangement of the battery cells in the third battery string is 1-0-0-1-0-0-1-0-0-0, the arrangement of the battery cells in the fourth battery string is 0-1-0-0-0-1-0-0-1-0, and the arrangement of the battery cells in the fifth battery string is 0-0-1-0-0-0-1-0-0-1-0. The arrangement of the battery cells in the sixth battery string is 1-0-0-1-0-0-1-0-0-0, the arrangement of the battery cells in the seventh battery string is 0-1-0-0-0-1-0-0-1-0, the arrangement of the battery cells in the eighth battery string is 0-0-1-0-0-0-1-0-0-1, and the arrangement of the battery cells in the ninth battery string is 1-0-0-1-0-0-1-0-0-0, please refer to Figure 6, Figure 6 is a structural schematic diagram of the first battery pack provided in an embodiment of the present application, and correspondingly, Figure 7 is a structural schematic diagram of the second battery pack provided in an embodiment of the present application; Figure 8 is a structural schematic diagram of the third battery pack provided in an embodiment of the present application, and Figure 9 is a structural schematic diagram of a battery pack after superposition provided in an embodiment of the present application.

In a feasible implementation, the cell size of the battery cell is any one of 1/2, 1/3, 1/4, 1/5, and 1/6 of a conventional cell.

For example, 1/2 battery cells are used for stacking, that is, the battery cells are evenly cut into 1/2 for welding and packaging. Of course, the battery cells can also be cut into battery strips of equal width of 1/3, 1/4, 1/5, 1/6.

Based on the above technical solution, the battery pack of this embodiment of the present application includes multiple battery strings, and the distance between adjacent battery cells in the battery string is a preset number of battery cell sizes. Multiple battery packs are staggered to form a surface-free structure, thereby maximizing the use of the light-receiving surface of the battery cell. More battery cells can be packaged in a certain packaging size, thereby improving the output power of the component.

A photovoltaic module provided in an embodiment of the present application is introduced below. The photovoltaic module described below and the cell group described above can refer to each other.

This embodiment provides a photovoltaic module, including:

An upper layer of glass, a first encapsulation layer, a battery cell group as described above, a second encapsulation layer, a lower backplane or a lower layer of glass.

Among them, there is no requirement for the thickness of the first encapsulation layer, the second encapsulation layer, the battery pack and the upper glass, the lower backplane or the lower glass. Generally, the thickness of the first encapsulation layer and the second encapsulation layer can be 0.45mm, the thickness of the battery pack can be 0.2mm, the thickness of the upper glass can be 0.2mm or 3.2mm, the thickness of the lower glass can be 0.2mm or 3.2mm, and the thickness of the lower backplane can be 0.2mm or 3.2mm. Of course, in addition to the above dimensions, users can customize the settings, and this embodiment will not limit them. Among them, when the upper glass can be a conventional flat glass, the shape of the upper glass is no longer limited in this embodiment, and can be square, round or other shapes, as long as it can achieve the purpose of this embodiment. Of course, the upper glass can be a special-shaped glass, such as a curved glass. This embodiment no longer limits the corresponding angle of the curved glass. The user can customize the settings, which can be 5 degrees, 10 degrees, 15 degrees, 20 degrees, or other degrees. It can be understood that the upper glass can be consistent with the lower glass, and of course it can be different.

For example, when the number of battery groups is two, please refer to Figure 10, which is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present application, and the photovoltaic module includes: an upper glass; a first encapsulation layer arranged on one side of the upper glass; a first battery group arranged on the side of the first encapsulation layer away from the upper glass; an inter-group encapsulation layer arranged on the side of the first battery group away from the first encapsulation layer; a second battery group arranged on the side of the inter-group encapsulation layer away from the first battery group; a second encapsulation layer arranged on the side of the second battery group away from the inter-group encapsulation layer; and a lower backplane or lower glass arranged on the side of the second encapsulation layer away from the second battery group. When the number of battery groups is three, please refer to Figure 11, which is a schematic diagram of the structure of another photovoltaic module provided in an embodiment of the present application, and the photovoltaic module includes: an upper glass; a first encapsulation layer arranged on one side of the upper glass; a first battery group arranged on the first encapsulation layer on the side away from the upper glass; a first inter-group encapsulation layer arranged on the first battery group on the side away from the first encapsulation layer; a second battery group arranged on the first inter-group encapsulation layer on the side away from the first battery group; a second inter-group encapsulation layer arranged on the side of the second battery group away from the inter-group encapsulation layer; a third battery group arranged on the second inter-group encapsulation layer on the side away from the second battery group; a second encapsulation layer arranged on the side of the three battery groups away from the second inter-group encapsulation layer; and a lower backplane or lower glass arranged on the second encapsulation layer on the side away from the second battery group.

In a feasible implementation, the first encapsulation layer, the second encapsulation layer, and the inter-group encapsulation layer are all POE or EVA.

Of course, the first encapsulation layer is POE, the second encapsulation layer is EVA, and the encapsulation layer between groups is POE; the first encapsulation layer is POE, the second encapsulation layer is EVA, and the encapsulation layer between groups is POE; the first encapsulation layer is POE, the second encapsulation layer is EVA, and the encapsulation layer between groups is EVA; the first encapsulation layer is POE, the second encapsulation layer is POE, and the encapsulation layer between groups is EVA; the first encapsulation layer is POE, the second encapsulation layer is POE, and the encapsulation layer between groups is EVA; the first encapsulation layer is EVA, the second encapsulation layer is EVA, and the encapsulation layer between groups is EVA; the first encapsulation layer is EVA, the second encapsulation layer is EVA, and the encapsulation layer between groups is POE; the first encapsulation layer is EVA, the second encapsulation layer is EVA, and the encapsulation layer between groups is POE; the first encapsulation layer is EVA, the second encapsulation layer is EVA, and the encapsulation layer between groups is POE; the first encapsulation layer is EVA, the second encapsulation layer is POE, and the encapsulation layer between groups is EVA; the first encapsulation layer is EVA, the second encapsulation layer is POE, and the encapsulation layer between groups is POE. It can be any of the above eight situations, and users can customize the settings.

In a feasible implementation, when the battery cell is a single-sided battery cell, the lower backplane is a non-transparent encapsulation backplane or a transparent encapsulation backplane.

Of course, when the battery cell is a double-sided battery cell, the lower backplane is a transparent packaging backplane.

For conventional components, the welding ribbon is connected from the back of the first battery cell to the front of the second battery cell, and the spacing between the two battery cells is very small. This height difference will produce certain stress; the height difference between the overlapping parts of the battery cells of the shingled module will also cause stress; the welding ribbon used in the patchwork is special, which will eliminate some stress, but stress still exists; the distance between the battery cells in this embodiment takes one or two battery groups as an example, and the distance between each battery cell is about 158mm per battery cell size. The spacing is large enough to eliminate stress, and after the upper and lower layers are combined, although there is no spacing between adjacent battery cells, there is no welding ribbon, and no stress will be generated.

A photovoltaic device provided in an embodiment of the present application is introduced below. The photovoltaic device described below and the photovoltaic assembly described above can refer to each other.

This embodiment provides a photovoltaic device, including the photovoltaic module as described above.

Since the embodiments of the photovoltaic device part correspond to the embodiments of the photovoltaic module part, the embodiments of the photovoltaic device part refer to the description of the embodiments of the photovoltaic module part, which will not be repeated here.

The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above is a detailed introduction to a battery cell group, photovoltaic module, and photovoltaic device provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims (9)

1. A battery pack, comprising:

The multi-layer battery packs are connected through bus bars, an inter-pack packaging layer is arranged between every two adjacent battery packs, and all the battery packs are arranged in a staggered mode, so that all the battery pieces after the battery packs are stacked are free of gaps and are not overlapped; when the battery packs are stacked, two strings of battery strings which are opposite to each other on the upper surface and the lower surface of the inter-pack packaging layer are arranged in a staggered mode, and therefore the surface of the finally obtained photovoltaic module is free of gaps; the structure formed by staggered arrangement is that all the battery packs are overlapped up and down and do not overlap, and the overlapped surfaces of the upper battery pack and the lower battery pack have no gap structure;

each layer of the battery pack comprises a plurality of battery strings, and adjacent battery strings are connected by bus bars;

the distance between adjacent battery pieces in each battery string is the size of a preset number of battery pieces before the battery packs are stacked, and the adjacent battery pieces are connected by using welding strips.

2. The battery pack according to claim 1, wherein in each of the battery packs, a first battery string is arranged with a side edge of a second battery string offset, wherein the side edge is one side parallel to the arrangement direction of the battery pieces in the first battery string, and the first battery string and the second battery string are adjacent battery strings.

3. The battery pack of claim 2, wherein a distance between adjacent ones of the battery cells in each of the battery strings is 1 of the battery cell sizes.

4. The battery pack of claim 3, wherein the number of battery packs is two layers.

5. The battery pack of claim 1, wherein the battery cell size of the battery cell is any one of 1/2, 1/3, 1/4, 1/5, 1/6 of a conventional battery cell.

6. A photovoltaic module, comprising:

An upper glass, a first encapsulation layer, a battery pack according to any one of claims 1 to 5, a second encapsulation layer, a lower back sheet or a lower glass.

7. The photovoltaic module of claim 6, wherein the first, second, and inter-group encapsulation layers are POE or EVA.

8. The photovoltaic module of claim 6, wherein when the cell is a single-sided cell, the underlying backsheet is a non-transparent encapsulated backsheet or a transparent encapsulated backsheet.

9. A photovoltaic device comprising a photovoltaic module according to any one of claims 6 to 8.