Battery assembly and photovoltaic system

Abstract

The invention discloses a battery assembly and a photovoltaic system. The battery assembly includes: a plurality of battery strings; the plurality of battery strings are arranged along a first direction; each battery string comprises a plurality of battery pieces, and the plurality of battery pieces are arranged along a second direction; wherein the first direction is perpendicular to the second direction; the string gap between two adjacent battery strings in the first direction is larger than the sheet gap between two adjacent battery sheets in one battery string. The double-sided rate of the battery assembly is improved, and the power of the battery assembly is improved.

Description

Technical Field

[0001] This invention relates to the field of solar energy technology, and more particularly to a battery module and a photovoltaic system. Background Technology

[0002] The photovoltaic industry has always been a hot topic, and battery modules have always shouldered the important mission of improving module conversion efficiency, reducing power generation costs, and extending the lifespan of power plants.

[0003] However, existing technologies for battery modules suffer from low bifaciality and low power. Summary of the Invention

[0004] This invention provides a battery module and a photovoltaic system to improve the bifaciality of the battery module and increase its power.

[0005] According to one aspect of the present invention, a battery assembly is provided, the battery assembly comprising:

[0006] Multiple battery strings; multiple battery strings are arranged along a first direction; each battery string includes multiple battery cells, and the multiple battery cells are arranged along a second direction; wherein the first direction and the second direction are perpendicular to each other;

[0007] The gap between two adjacent battery strings along the first direction is greater than the gap between two adjacent cells in a battery string.

[0008] Furthermore, the battery assembly also includes:

[0009] The glaze layer and the backplate, the glaze layer includes a first glaze layer and a second glaze layer, the projection of the first glaze layer on the backplate covers the string gap between two adjacent battery strings along the first direction, and the projection of the second glaze layer on the backplate covers the sheet gap between two adjacent battery cells in a battery string.

[0010] The ratio A of the width of the gap between the layers to the width of the first glaze layer is greater than the ratio B of the width of the gap between the layers to the width of the second glaze layer.

[0011] Furthermore, the ratio A of the width of the inter-row gap to the width of the first glaze layer is greater than or equal to 1 / 8 and less than 1 / 3;

[0012] The ratio B of the width of the gap to the width of the second glaze layer is greater than or equal to 1 / 8 and less than 1 / 3.

[0013] Furthermore, the ratio A of the width of the inter-row gap to the width of the first glaze layer is 1:4;

[0014] The ratio B between the width of the gap and the width of the second glaze layer is 1:6.

[0015] Furthermore, each solar cell includes at least two chamfers;

[0016] At the intersection of the string gap and the cell gap, the projection of the chamfered area formed by the chamfers of at least two cells onto the backsheet lies within the glaze layer.

[0017] Furthermore, at least two chamfers are provided at the junction of the first glaze layer and the second glaze layer, and the at least two chamfers are arranged in a centrally symmetrical manner.

[0018] Furthermore, at least two glaze chamfers are set to correspond one-to-one with at least two battery cell chamfers.

[0019] Furthermore, four cell chamfers are provided at the junction of the string gap and the cell gap, and two glaze layer chamfers are provided at the junction of the first glaze layer and the second glaze layer.

[0020] Furthermore, the width of the string gap is 2mm;

[0021] The width of the gap between the plates is 1 mm;

[0022] The width of the first glaze layer is 8mm;

[0023] The width of the second glaze layer is 6mm.

[0024] Furthermore, the battery assembly is a back-contact battery assembly, and the backplate is made of glass.

[0025] According to another aspect of the present invention, a photovoltaic system is provided, including the battery module described in any embodiment of the present invention.

[0026] The battery module provided in this embodiment of the invention has a string gap between two adjacent battery strings that is larger than the cell gap between two adjacent cells. On the one hand, by setting a smaller cell gap, the bifaciality of the module can be improved, the module power can be increased, and the length of the connecting solder strip between two adjacent cells can be saved. On the other hand, by setting a larger string gap, the manufacturing process of each string gap is simplified, thereby reducing the production cost and time cost of manufacturing the battery module and improving production efficiency.

[0027] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a battery assembly according to an embodiment of the present invention;

[0030] Figure 2 This is a partial structural schematic diagram of a battery assembly according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the chamfered region in a battery assembly according to an embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] This invention provides a battery assembly. Figure 1 This is a schematic diagram of a battery assembly according to an embodiment of the present invention, with reference to... Figure 1 The battery assembly includes:

[0035] Multiple battery strings 1; multiple battery strings 1 are arranged along a first direction X; each battery string 1 includes multiple battery cells 2, and the multiple battery cells 2 are arranged along a second direction Y; wherein, the first direction X and the second direction Y are perpendicular to each other;

[0036] The gap 3 between two adjacent battery strings 1 along the first direction X is greater than the gap 4 between two adjacent battery pieces 2 in a battery string 1.

[0037] In this context, "multiple" can be understood as two or more. For example, a battery assembly may include at least two battery strings 1, and each battery string 1 may include two or more battery cells 2. The number of battery strings 1 and battery cells 2 can be set according to actual conditions. Furthermore, the battery cells 2 described in this embodiment of the invention may be a whole battery cell or multiple battery cells obtained by cutting a whole battery cell. This embodiment of the invention does not impose any restrictions on this.

[0038] Specifically, since there are many gaps 4 between cells in the battery module, and two adjacent cells 2 in the battery string 1 need to be connected by multiple solder strips, setting a smaller gap 4 can save the length of solder strips used. However, since setting a smaller gap between two battery strings 1 requires a more complex manufacturing process, setting the string gap 3 between two adjacent battery strings 1 to be larger than the gap 4 between two adjacent cells 2 simplifies the manufacturing process and saves time.

[0039] In the battery assembly provided in this embodiment of the invention, the string gap 3 between two adjacent battery strings 1 along the first direction X is larger than the sheet gap 4 between two adjacent battery cells 2 in a battery string 1. On the one hand, by setting a smaller sheet gap 4, the bifaciality of the battery assembly can be improved, the power of the battery assembly can be increased, and the length of the connecting solder strip between two adjacent battery cells 2 can be saved. On the other hand, by setting a larger string gap 3, the manufacturing process of each string gap 3 is simplified, thereby reducing the production cost and time cost of manufacturing the battery assembly and improving production efficiency.

[0040] Furthermore, Figure 2 This is a partial structural schematic diagram of a battery assembly according to an embodiment of the present invention, with reference to... Figure 1 and Figure 2 The battery assembly also includes:

[0041] Glaze layer 6 and back plate 5. Glaze layer 6 includes a first glaze layer 61 and a second glaze layer 62. The projection of the first glaze layer 61 on the back plate 5 covers the string gap 3 between two adjacent battery strings 1 along the first direction X. The projection of the second glaze layer 62 on the back plate 5 covers the sheet gap 4 between two adjacent battery pieces 2 in a battery string 1.

[0042] The ratio A of the width of the first glaze layer gap 3 to the width of the first glaze layer 61 is greater than the ratio B of the width of the sheet gap 4 to the width of the second glaze layer 62.

[0043] Specifically, during normal operation of the battery module, sunlight passes through the string gaps 3 and cell gaps 4, and leaks through the backplate 5. Therefore, a first glaze layer 61 is provided at the corresponding position of the string gap 3 on the backplate 5, and a second glaze layer 62 is provided at the corresponding position of the cell gap 4 on the backplate 5. This allows the sunlight passing through the string gaps 3 and cell gaps 4 to be reflected by the first glaze layer 61 and the second glaze layer 62 on the backplate 5, thereby improving the power and conversion efficiency of the battery module. If the ratio A of the width of the string gap 3 to the width of the first glaze layer 61 is set to be the same as the ratio B of the width of the cell gap 4 to the width of the second glaze layer 62, then the width of the first glaze layer 61 needs to be widened, or the width of the second glaze layer 62 needs to be reduced. If the first glaze layer 61 is widened, the bifaciality of the battery module will be reduced; if the width of the second glaze layer 62 is reduced, there will be a risk of light leakage between the cells 2. Therefore, the solution of this embodiment can balance the utilization rate of sunlight and the bifaciality of the battery module.

[0044] Further reference Figure 1 and Figure 2 The ratio A of the width of the gap 3 to the width of the first glaze layer 61 is greater than or equal to 1 / 8 and less than 1 / 3;

[0045] The ratio B of the width of the gap 4 to the width of the second glaze layer 62 is greater than or equal to 1 / 8 and less than 1 / 3.

[0046] Specifically, by setting the ratio A of the width of the string gap 3 to the width of the first glaze layer 61 to be greater than or equal to 1 / 8 and less than 1 / 3, most of the sunlight passing through the string gap 3 is reflected onto the battery module while avoiding excessive shading of the back surface of the battery module by the first glaze layer 61, effectively improving the bifaciality of the battery module. For example, if the ratio A of the width of the string gap 3 to the width of the first glaze layer 61 is less than 1 / 8, the width of the first glaze layer 61 is larger, resulting in excessive shading of the back surface of the battery module by the first glaze layer 61, reducing the bifaciality of the battery module; if the ratio A of the width of the string gap 3 to the width of the first glaze layer 61 is greater than or equal to 1 / 3, the width of the first glaze layer 61 is smaller, and it is not possible to fully reflect the sunlight passing through the string gap 3, reducing the utilization rate of sunlight.

[0047] The ratio B of the width of the inter-cell gap 4 to the width of the second glaze layer 62 is greater than or equal to 1 / 8 and less than 1 / 3. This achieves the goal of reflecting most of the sunlight passing through the inter-cell gap 4 onto the battery module while avoiding excessive shading of the back surface of the battery module by the second glaze layer 62. This effectively improves the bifaciality of the battery module. For example, if the ratio B of the width of the inter-cell gap 4 to the width of the second glaze layer 62 is less than 1 / 8, the width of the second glaze layer 62 will be larger, resulting in excessive shading of the back surface of the battery module by the second glaze layer 62 and reducing the bifaciality of the battery module. If the ratio of the width of the inter-cell gap 4 to the width of the second glaze layer 62 is greater than or equal to 1 / 3, the width of the second glaze layer 62 will be smaller, and it will not be able to fully reflect the sunlight passing through the inter-cell gap 4, reducing the utilization rate of sunlight.

[0048] Furthermore, the ratio A of the width of the inter-row gap to the width of the first glaze layer is 1:4;

[0049] The ratio B between the width of the gap and the width of the second glaze layer is 1:6.

[0050] Specifically, setting the ratio of the width of the string gap to the width of the first glaze layer to 1:4 ensures that most of the sunlight passing through the string gap is reflected onto the battery module, while avoiding excessive shading of the back surface of the battery module by the first glaze layer. In other words, it ensures both the utilization rate of sunlight and the bifaciality of the battery module.

[0051] Setting the ratio of the gap width to the width of the second glaze layer to 1:6 ensures that most of the sunlight passing through the gap is reflected onto the battery module, while avoiding excessive shading of the back surface of the battery module by the second glaze layer. In other words, it ensures both the utilization rate of sunlight and the bifaciality of the battery module.

[0052] Furthermore, Figure 3 This is a schematic diagram of the chamfered region in a battery assembly according to an embodiment of the present invention, with reference to... Figures 1-3 Each solar cell 2 includes at least two solar cell chamfers 71;

[0053] At the intersection of the string gap 3 and the cell gap 4, the projection of the chamfered area 72, which is surrounded by at least two cell chamfers 71, onto the backplate 5 is located within the glaze layer.

[0054] Wherein, "at least two" can be understood as two or more. For example, each battery cell 2 includes two or more battery cell chamfers 71. If the battery cell 2 described in the embodiment of the present invention is a whole battery cell 2, it indicates that each battery cell 2 includes four battery cell chamfers 71. If the battery cell 2 described in the embodiment of the present invention is a half battery cell 2 obtained by cutting a whole battery cell, it indicates that each battery cell 2 includes two battery cell chamfers 71.

[0055] Specifically, the projection of the chamfered area 72 onto the back panel 5 is located within the glaze layer 6, that is, the projection of the chamfered area 72 onto the back panel 5 is located at the intersection area 81 of the first glaze layer 61 and the second glaze layer 62. This ensures that sunlight passing through the chamfered area 72 is reflected by the glaze layer intersection area 81 onto the battery module, thereby improving the utilization rate of sunlight.

[0056] Further reference Figures 1-3 At least two glaze chamfers 82 are provided at the junction of the first glaze layer 61 and the second glaze layer 62, and the at least two glaze chamfers 82 are arranged in a centrally symmetrical manner, which can reduce the probability of light leakage in the chamfer area of ​​the battery cell.

[0057] Wherein, "at least two" can be understood as two or more. For example, at the junction of the first glaze layer 61 and the second glaze layer 62, there are two or more glaze layer chamfers 82, and the two or more glaze layer chamfers 82 are arranged in a centrally symmetrical manner.

[0058] Specifically, multiple cell chamfers 71 and multiple glaze layer chamfers 82 can be set one-to-one. Two cell chamfers 71 can also be set at the intersection of the string gap 3 and the cell gap 4, and four glaze layer chamfers 82 can be set in the intersection area of ​​the first glaze layer 61 and the second glaze layer 62 to completely cover the intersection area of ​​the string gap 3 and the cell gap 4. Alternatively, four cell chamfers 71 can be set at the intersection of the string gap 3 and the cell gap 4, and two glaze layer chamfers 82 can be set at the intersection of the first glaze layer 61 and the second glaze layer 62, thereby achieving a balance between the bifaciality of the battery module and poor light leakage of the battery module.

[0059] Further reference Figures 1-3 At least two glaze chamfers 82 are set to correspond one-to-one with at least two battery cell chamfers 71.

[0060] Specifically, if the junction of the first glaze layer 61 and the second glaze layer 62 includes two cell chamfers 71, then two glaze layer chamfers 82 can be provided at the junction of the first glaze layer 61 and the second glaze layer 62; if the junction of the first glaze layer 61 and the second glaze layer 62 includes four cell chamfers 71, then four glaze layer chamfers 82 can be provided at the junction of the first glaze layer 61 and the second glaze layer 62. By providing at least two glaze layer chamfers 82 corresponding one-to-one with at least two cell chamfers 71, it ensures that sunlight passing through the junction area of ​​the string gap 3 and the cell gap 4 is reflected onto the battery module through the junction area of ​​the first glaze layer 61 and the second glaze layer 62, while avoiding excessive shading of the back surface of the battery module at the junction area of ​​the first glaze layer 61 and the second glaze layer 62. In other words, it ensures both the utilization rate of sunlight and the bifaciality of the battery module.

[0061] Further reference Figures 1-3 Four cell chamfers 71 are provided at the intersection of the string gap 3 and the cell gap 4, and two glaze layer chamfers 82 are provided at the intersection of the first glaze layer 61 and the second glaze layer 62.

[0062] Specifically, four cell chamfers 71 are provided at the intersection of the string gap 3 and the cell gap 4, making the chamfered area 72 formed by the four cell chamfers 71 larger. If the position of the second glaze layer 62 formed on the back plate 5 deviates from that of the first glaze layer 61, it is easy to cause misalignment between the glaze layer intersection area 81 of the first glaze layer 61 and the chamfered area 71 of the string gap 3 and the cell gap 4. However, by providing only two glaze layer chamfers 82 in the glaze layer intersection area 81 of the first glaze layer 61 and the second glaze layer 62, misalignment between the chamfered area 72 of the string gap 3 and the cell gap 4 and the glaze layer intersection area 81 of the first glaze layer 61 can be effectively avoided when the position of the second glaze layer 62 and the first glaze layer 61 deviates. This effectively prevents some sunlight from penetrating the back plate through the chamfered area 72 of the string gap 3 and the cell gap 4, thus avoiding the waste of some sunlight.

[0063] Furthermore, the width of the string gap is 2mm;

[0064] The width of the gap between the plates is 1 mm;

[0065] The width of the first glaze layer is 8mm;

[0066] The width of the second glaze layer is 6mm.

[0067] Specifically, due to the numerous gaps between cells in the battery module and the need for multiple solder ribbons to connect adjacent cells in a battery string, a 1mm gap width is set, effectively saving on the length of solder ribbons used. However, since setting a smaller gap between two cells requires a more complex manufacturing process, and fewer solder ribbons are needed between adjacent battery strings, a 2mm gap width is set, simplifying the manufacturing process and saving time.

[0068] Setting the string gap width to 2mm and the first glaze layer width to 8mm ensures that all sunlight passing through the string gap is reflected by the first glaze layer to the back surface of the battery module, improving sunlight utilization while avoiding excessive shading of the back surface, thus ensuring the bifaciality of the battery module. Setting the cell gap width to 1mm is problematic. If the ratio of the string gap width to the first glaze layer width is the same as the ratio of the cell gap width to the second glaze layer width, then the width of the second glaze layer would be greater than the width of the first glaze layer. A larger second glaze layer would excessively shade the back surface of the battery module, thus reducing the bifaciality. Therefore, a second glaze layer width of 6mm is required. This reduces the shading of the battery module's back surface by the second glaze layer while ensuring that most of the sunlight passing through the cell gap is directed to the back surface, balancing sunlight utilization and the bifaciality of the battery module.

[0069] Furthermore, the battery assembly is a back-contact battery assembly, and the backplate is made of glass.

[0070] This invention also provides a photovoltaic system, including the battery module described in any embodiment of this invention.

[0071] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0072] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A battery assembly, characterized in that, include: Multiple battery strings; the multiple battery strings are arranged along a first direction; each battery string includes multiple battery cells, the multiple battery cells are arranged along a second direction; wherein the first direction and the second direction are perpendicular to each other; The gap between two adjacent battery strings along the first direction is greater than the gap between two adjacent battery cells in a battery string.

2. The battery assembly according to claim 1, characterized in that, Also includes: The glaze layer and the backplate, wherein the glaze layer includes a first glaze layer and a second glaze layer, the projection of the first glaze layer on the backplate covering the string gap between two adjacent battery strings along the first direction, and the projection of the second glaze layer on the backplate covering the sheet gap between two adjacent battery cells in a string of battery cells. The ratio A of the width of the string gap to the width of the first glaze layer is greater than the ratio B of the width of the sheet gap to the width of the second glaze layer.

3. The battery assembly according to claim 2, characterized in that, A is greater than or equal to 1 / 8 and less than 1 / 3; B is greater than or equal to 1 / 8 and less than 1 / 3.

4. The battery assembly according to claim 2, characterized in that, Each of the aforementioned solar cells includes at least two cell chamfers; At the intersection of the string gap and the cell gap, the chamfered area formed by at least two of the cell chamfers is projected within the glaze layer on the backplate.

5. The battery assembly according to claim 4, characterized in that, At least two chamfers are provided at the junction of the first glaze layer and the second glaze layer, and the at least two chamfers are arranged in a centrally symmetrical manner.

6. The battery assembly according to claim 5, characterized in that, At least two of the glaze chamfers are provided in a one-to-one correspondence with at least two of the battery cell chamfers.

7. The battery assembly according to claim 5, characterized in that, Four cell chamfers are provided at the intersection of the string gap and the cell gap, and two glaze layer chamfers are provided at the intersection of the first glaze layer and the second glaze layer.

8. The battery assembly according to claim 2, characterized in that, The battery assembly is a back-contact battery assembly, and the backplate is glass.

9. A photovoltaic system, characterized in that, The battery assembly includes any one of claims 1-8 above.

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