Photovoltaic panel and photovoltaic module

Abstract

The utility model discloses a photovoltaic panel, which comprises a battery array, the battery array comprises a plurality of battery strings, each battery string comprises a plurality of battery pieces which are sequentially arranged and connected along a first direction, the plurality of battery strings are arranged at intervals in a second direction, and the first direction is perpendicular to the second direction; the plurality of bus bars are positioned on one side of the plurality of battery strings in the first direction, and the plurality of bus bars are arranged at intervals in the second direction; the battery piece, located at one end of the first direction, of each battery string is connected with the adjacent bus bar, and the battery pieces, located at the other end of the first direction, of every two adjacent battery strings connected to different bus bars are connected with each other. Therefore, the overall area of the photovoltaic panel can be reduced, the conversion efficiency of the photovoltaic panel can be improved, the weight of the photovoltaic panel can be reduced, and the transportation cost can also be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic panel and a photovoltaic component. Background Art

[0002] In the prior art, when a photovoltaic module is in operation, current enters the bus bar in the middle of the photovoltaic panel from the negative electrode, passes through the battery cells, and then passes through the bus bars on both sides of the photovoltaic panel, and finally flows out from the positive electrode of the bus bar in the middle of the photovoltaic panel. The bus bars on both sides of the photovoltaic panel not only consume electrical energy, but also occupy the area of ​​the photovoltaic panel, affecting the power generation efficiency of the photovoltaic panel. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a photovoltaic panel that can reduce the overall area, thereby improving the conversion efficiency of the photovoltaic panel, reducing the weight of the photovoltaic panel, and reducing the transportation cost.

[0004] The utility model further provides a photovoltaic component.

[0005] According to the photovoltaic panel of the embodiment of the first aspect of the utility model, the photovoltaic panel includes: a battery array, the battery array includes a plurality of battery strings, each of the battery strings includes a plurality of battery cells arranged and connected in sequence along a first direction, the plurality of battery strings are arranged at intervals in a second direction, and the first direction is perpendicular to the second direction; a plurality of bus bars, the plurality of bus bars are located on one side of the first direction of the plurality of battery strings, and the plurality of bus bars are arranged at intervals in the second direction; wherein the battery cells at one end of each battery string in the first direction are connected to the adjacent bus bar, and the battery cells at the other end of each two adjacent battery strings connected to different bus bars are connected to each other.

[0006] As a result, the photovoltaic panel can reduce the overall area, thereby improving the conversion efficiency of the photovoltaic panel, reducing the weight of the photovoltaic panel, and reducing transportation costs.

[0007] According to some embodiments of the present invention, the battery cells located at the other end of the first direction of every two adjacent battery strings connected to different bus bars are connected through electrode contacts.

[0008] According to some embodiments of the present invention, the battery cells located at the other end of the first direction of every two adjacent battery strings connected to different bus bars are connected by a connecting line, and in the second direction, the connecting line is located between the corresponding two battery cells.

[0009] According to some embodiments of the present invention, the bus bars located at both ends of the second direction among the multiple bus bars are respectively connected to a corresponding one of the battery strings, and the bus bars located between the two ends of the second direction among the multiple bus bars are respectively connected to two corresponding battery strings.

[0010] According to some embodiments of the present invention, the lengths of the bus bars located at both ends of the second direction among the multiple bus bars are the same, and the lengths of the bus bars located between the two ends of the second direction among the multiple bus bars are the same and greater than the lengths of the bus bars located at both ends of the second direction among the multiple bus bars.

[0011] According to some embodiments of the present invention, there are two battery arrays, and the two battery arrays are located on both sides of the first direction of the plurality of bus bars to share the plurality of bus bars.

[0012] According to some embodiments of the present invention, the plurality of bus bars are located at a center line of the photovoltaic panel in a first direction, and the two battery arrays are symmetrically arranged with respect to the center line of the photovoltaic panel in the first direction.

[0013] According to some embodiments of the utility model, the battery cell includes: a battery cell body; a first main bus line, which is arranged on the battery cell body and extends along the second direction; a second main bus line, which is arranged on the battery cell body and extends along the first direction, and the second main bus line is cross-connected with the first main bus line; and a secondary bus line, which is arranged on the battery cell body and extends along the first direction, and the secondary bus line is cross-connected with the first main bus line.

[0014] According to some embodiments of the utility model, there are multiple first main grid lines, multiple second main grid lines and multiple auxiliary grid lines, multiple first main grid lines are evenly spaced along the first direction, multiple second main grid lines are evenly spaced along the second direction, and multiple auxiliary grid lines are distributed between two adjacent second main grid lines.

[0015] The photovoltaic assembly according to the embodiment of the second aspect of the utility model includes: the above-mentioned photovoltaic panel.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1It is a schematic diagram of the structure of the battery string connection in the photovoltaic panel according to the embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of a battery cell according to an embodiment of the utility model.

[0020] Reference numerals:

[0021] 100. Photovoltaic panels;

[0022] 10. Battery array; 11. Battery string; 12. Battery cell; 121. Battery cell body; 122. First main grid line; 123. Second main grid line; 124. Secondary grid line;

[0023] 20. Bus bar. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0025] Reference below Figure 1-Figure 2 A photovoltaic panel 100 according to an embodiment of the present invention is described.

[0026] like Figure 1 As shown, according to the photovoltaic panel 100 of the embodiment of the first aspect of the utility model, the photovoltaic panel 100 includes: a battery array 10 and a plurality of bus bars 20, the battery array 10 includes a plurality of battery strings 11, each battery string 11 includes a plurality of battery cells 12 arranged and connected in sequence along a first direction, the plurality of battery strings 11 are arranged at intervals in a second direction, the first direction is perpendicular to the second direction, the plurality of bus bars 20 are located on one side of the first direction of the plurality of battery strings 11, and the plurality of bus bars 20 are arranged at intervals in the second direction, wherein the battery cells 12 located at one end of each battery string 11 in the first direction are connected to the adjacent bus bar 20, and the battery cells 12 located at the other end of the first direction of every two adjacent battery strings 11 connected to different bus bars 20 are connected to each other.

[0027] When traditional photovoltaic panels are in operation, the current enters the bus bar in the middle of the photovoltaic panel from the negative pole, then passes through the battery string, and then passes through the bus bars on both sides of the photovoltaic panel, and finally flows out from the positive pole of the bus bar in the middle of the photovoltaic panel. The setting of the bus bars on both sides of the photovoltaic panel increases the area of ​​the photovoltaic panel, which not only reduces the conversion efficiency of the photovoltaic panel, but also increases the loss.

[0028] The photovoltaic panel 100 is mainly composed of a battery array 10 and a plurality of bus bars 20, wherein the battery array 10 is composed of a plurality of battery strings 11, each battery string 11 is composed of a plurality of battery cells 12 connected in sequence along a first direction, and the plurality of bus bars 20 are located on one side of the plurality of battery strings 11, and the plurality of bus bars 20 located on one side of the battery strings 11 are arranged at intervals in a second direction, which can facilitate electrical connection with the plurality of battery strings 11 arranged at intervals in the second direction, and can also reduce the area of ​​the photovoltaic panel 100 occupied by the bus bars 20.

[0029] Specifically, one end of each battery string 11 located in the first direction is connected to the adjacent bus bar 20, which can ensure the current flow between one end of each battery string 11 and the adjacent bus bar 20. Furthermore, two adjacent battery strings 11 connected to different bus bars 20 are connected between the battery cells 12 at the other end of the first direction. In this way, the arrangement of the bus bar 20 at the other end of the first direction of multiple battery strings 11 can be reduced, which can save the arrangement space of the bus bar 20 on the photovoltaic panel 100. In this way, the area of ​​the photovoltaic panel 100 can be reduced. Since the ratio of the power of the photovoltaic panel to the area of ​​the photovoltaic panel is the conversion efficiency of the photovoltaic panel, the conversion efficiency of the photovoltaic panel 100 can be improved by reducing the area of ​​the photovoltaic panel 100, and the weight of the photovoltaic panel 100 can also be reduced, and the transportation cost can also be reduced.

[0030] In addition, since the photovoltaic panel 100 generates heat during operation, the power generation efficiency of the photovoltaic panel 100 will decrease with each degree increase in temperature. Reducing the arrangement of the bus bar 20 at the other end of the first direction of the battery string 11 can reduce certain losses. In this way, the generation of heat can be reduced, thereby further improving the power generation efficiency of the photovoltaic panel 100.

[0031] Therefore, the overall area of ​​the photovoltaic panel 100 can be reduced, thereby improving the conversion efficiency of the photovoltaic panel 100, reducing the weight of the photovoltaic panel 100, and reducing the transportation cost.

[0032] According to a specific embodiment of the present invention, the battery cells 12 located at the other end of the first direction of every two adjacent battery strings 11 connected to different bus bars 20 are connected through mutual electrode contact.

[0033] Specifically, the battery cells 12 at the other end of the first direction of two adjacent battery strings 11 connected to different bus bars 20 can be connected by electrode contact, which can provide a stronger and more reliable connection that is less likely to loosen or fall off.

[0034] According to another embodiment of the present invention, Figure 1As shown, the battery cells 12 at the other end of each two adjacent battery strings 11 connected to different bus bars 20 in the first direction are connected by a connecting line, and in the second direction, the connecting line is located between the corresponding two battery cells 12 .

[0035] Among them, the battery cells 12 located at the other end of the first direction of two adjacent battery strings 11 connected to different bus bars 20 can be connected by connecting wires. The connecting wire connection method is relatively simple, which can improve the connection efficiency between the two battery cells 12 and reduce power loss.

[0036] According to the specific embodiment of the utility model, Figure 1 As shown, the bus bars 20 located at both ends of the second direction among the multiple bus bars 20 are respectively connected to a corresponding battery string 11, and the bus bars 20 located between the two ends of the second direction among the multiple bus bars 20 are respectively connected to two corresponding battery strings 11.

[0037] Specifically, the busbars 20 located at the two ends of the second direction are respectively connected to a battery string 11 in the first direction, that is, a battery string 11 is correspondingly connected to both sides of the busbar 20, and the busbar 20 located between the two ends of the second direction is respectively connected to two battery strings 11 in the first direction, and two battery strings 11 are correspondingly connected to both sides of the busbar 20. When the current enters from the negative pole of the busbar 20 at one end of the second direction, it passes through a battery string 11 connected to the busbar 20 at one end of the second direction, and then passes through two battery strings 11 connected to the busbar 20 between the two ends of the second direction, and finally flows out from the positive pole of the busbar 20 at the other end of the second direction. In this way, the loss of electricity can be reduced, thereby improving the power generation rate of the photovoltaic panel 100.

[0038] According to some embodiments of the present invention, Figure 1 As shown, the lengths of the bus bars 20 located at the two ends of the second direction among the multiple bus bars 20 are the same, the lengths of the bus bars 20 located between the two ends of the second direction among the multiple bus bars 20 are the same, and the lengths of the bus bars 20 located between the two ends of the second direction among the multiple bus bars 20 are greater than the lengths of the bus bars 20 located at the two ends of the second direction among the multiple bus bars 20.

[0039] Among them, since the busbar 20 can transmit the current to the battery string 11 in a concentrated manner, when the current enters from the negative pole of the busbar 20, since one side of the busbar 20 at both ends of the second direction is correspondingly connected to a battery string 11, the required power is smaller, and one side of the busbar 20 between the two ends of the second direction is correspondingly connected to two battery strings 11, and the power required to be consumed is larger. Therefore, the length of the busbar 20 located between the two ends of the second direction is greater than the length of the busbar 20 located at the two ends of the second direction. In this way, the current output of different numbers of battery strings 11 can be met by busbars 20 of different lengths.

[0040] According to some embodiments of the present invention, Figure 1 As shown, there are two battery arrays 10 , and the two battery arrays 10 are located on both sides of the first direction of the plurality of bus bars 20 , so that the plurality of bus bars 20 can be shared.

[0041] Among them, multiple bus bars 20 are arranged between two battery arrays 10, so that the two battery arrays 10 can share multiple bus bars 20, so that the utilization efficiency of the bus bars 20 can be improved, and the power loss of the photovoltaic panel 100 can be reduced, thereby improving the power generation efficiency of the photovoltaic panel 100.

[0042] According to a specific embodiment of the present invention, a plurality of bus bars 20 are located at the center line of the photovoltaic panel 100 in the first direction, and the two battery arrays 10 are symmetrically arranged with respect to the center line of the photovoltaic panel 100 in the first direction.

[0043] The two battery arrays 10 are symmetrically arranged about the first direction midline of the photovoltaic panel 100, which can reduce the shadow effect. When the battery string 11 on the photovoltaic panel 100 is covered by the shadow, it will cause a large power loss in the battery string 11 connected in series. By symmetrical arrangement, the influence of the shadow effect on the entire photovoltaic panel 100 can be reduced, and the overall efficiency of the photovoltaic panel 100 can also be improved.

[0044] Furthermore, the symmetrical arrangement of the two battery arrays 10 about the midline of the first direction of the photovoltaic panel 100 can reduce heat unevenness. The photovoltaic panel 100 will generate a certain amount of heat when working. The uneven heat distribution may cause the performance of some photovoltaic panels 100 to decline. The symmetrical arrangement can reduce the impact of heat unevenness on the photovoltaic panel 100, thereby improving the stability and service life of the entire photovoltaic panel 100.

[0045] According to some embodiments of the present invention, Figure 2 As shown, the battery cell 12 includes: a battery cell body 121, a first main grid line 122, a second main grid line 123 and a secondary grid line 124, the first main grid line 122 is arranged on the battery cell body 121, and the first main grid line 122 extends along the second direction, the second main grid line 123 is arranged on the battery cell body 121, and the second main grid line 123 extends along the first direction, the second main grid line 123 is cross-connected with the first main grid line 122, and the secondary grid line 124 is arranged on the battery cell body 121, and the secondary grid line 124 extends along the first direction, and the secondary grid line 124 is cross-connected with the first main grid line 122.

[0046] Among them, the battery cell 12 is mainly composed of a battery cell body 121, a first main grid line 122, a second main grid line 123 and an auxiliary grid line 124. The first main grid line 122 on the battery cell 12 extends along the second direction. The first main grid line 122 is connected to the battery cell 12 through a welding strip, which can reduce the resistance loss inside the battery cell 12 and improve the current transmission efficiency of the battery cell 12, thereby improving the overall power generation efficiency of the photovoltaic panel 100.

[0047] Furthermore, a second main grid line 123 is also provided on the battery cell 12. The second main grid line 123 is connected to the battery cell 12 along a first direction through a welding strip, and the second main grid line 123 is cross-connected with the first main grid line 122. In this way, vertical welding is achieved, which can increase the welding tension, so that the first main grid line 122 and the second main grid line 123 can be welded on the front side of the battery cell body 121 more stably and firmly, and the current carrying capacity of the battery cell 12 can be further improved.

[0048] In addition, the auxiliary grid line 124 is arranged on the back side of the battery cell body 121 , and the auxiliary grid line 124 is cross-connected with the first main grid line 122 , and can be responsible for assisting the first main grid line 122 and the second main grid line 123 in transmitting current, thereby improving the overall efficiency of the battery cell 12 .

[0049] According to some embodiments of the utility model, there are multiple first main grid lines 122, second main grid lines 123 and auxiliary grid lines 124, multiple first main grid lines 122 are evenly spaced along the first direction, multiple second main grid lines 123 are evenly spaced along the second direction, and multiple auxiliary grid lines 124 are distributed between two adjacent second main grid lines 123.

[0050] Among them, multiple first main grid lines 122 are evenly spaced along the first direction, and multiple second main grid lines 123 are evenly spaced along the second direction. In this way, the overall current carrying capacity of the battery cell 12 can be improved, and the multiple first main grid lines 122 are cross-connected with the multiple second main grid lines 123. For example, the multiple first main grid lines 122 and the multiple second main grid lines 123 can be vertically welded, so that the multiple first main grid lines 122 and the multiple second main grid lines 123 can be more firmly welded after welding, and can better transmit current and dissipate heat, thereby improving the overall current carrying capacity of the battery cell 12.

[0051] The photovoltaic assembly according to the embodiment of the second aspect of the utility model includes: the photovoltaic panel 100 of the above embodiment.

[0052] Among them, the photovoltaic panel includes: a front panel (front glass panel) - adhesive film - battery cell - adhesive film - back panel (rear glass panel). Since the battery cell is arranged on the glass panel, bus bars are arranged on the edges of both sides of the glass panel in the traditional photovoltaic panel. The distance from the battery cell close to the edge of the glass panel to the edge of the glass panel is greater than the creepage distance.

[0053] In the photovoltaic panel 100, no busbars 20 are set on the edges of the glass plate on both sides, so the distance from the battery cell 12 close to the edge of the glass plate to the edge of the glass plate can be equal to the creepage distance. In this way, the area of ​​the photovoltaic panel 100 can be reduced, the cost of the film and silicone can be reduced, the weight of the photovoltaic module can be reduced, and the transportation cost can be reduced, thereby improving the power generation efficiency of the photovoltaic module.

[0054] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purpose of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A photovoltaic panel, characterized in that: include: A battery array, the battery array comprising a plurality of battery strings, each of the battery strings comprising a plurality of battery cells arranged and connected in sequence along a first direction, the plurality of battery strings being arranged at intervals in a second direction, the first direction being perpendicular to the second direction; A plurality of bus bars, the plurality of bus bars are located on one side of the plurality of battery strings in the first direction, and the plurality of bus bars are arranged at intervals in the second direction; The battery cells at one end of each battery string in the first direction are connected to the adjacent bus bar, and the battery cells at the other end of each two adjacent battery strings connected to different bus bars in the first direction are connected to each other.

2. The photovoltaic panel according to claim 1, characterized in that: The battery cells located at the other end of the first direction of every two adjacent battery strings connected to different bus bars are connected through mutual electrode contact.

3. The photovoltaic panel according to claim 1, characterized in that: The battery cells located at the other end of the first direction of every two adjacent battery strings connected to different bus bars are connected by a connecting line, and in the second direction, the connecting line is located between the corresponding two battery cells.

4. The photovoltaic panel according to claim 1, characterized in that: The bus bars located at both ends of the second direction among the plurality of bus bars are respectively connected to a corresponding one of the battery strings, and the bus bars located between the two ends of the second direction among the plurality of bus bars are respectively connected to two corresponding battery strings.

5. The photovoltaic panel according to claim 4, characterized in that: The bus bars at both ends of the second direction have the same length, and the bus bars between the two ends of the second direction have the same length and are greater than the length of the bus bars at both ends of the second direction.

6. The photovoltaic panel according to claim 1, characterized in that: There are two battery arrays, and the two battery arrays are located on both sides of the plurality of bus bars in the first direction so as to share the plurality of bus bars.

7. The photovoltaic panel according to claim 6, characterized in that: The plurality of bus bars are located at a first direction center line of the photovoltaic panel, and the two battery arrays are symmetrically arranged with respect to the first direction center line of the photovoltaic panel.

8. The photovoltaic panel according to claim 1, characterized in that: The battery cell comprises: Battery cell body; A first busbar, which is disposed on the battery cell body and extends along a second direction; A second main bus line, which is disposed on the battery cell body and extends along a first direction, and is cross-connected with the first main bus line; A secondary grid line is arranged on the battery cell body and extends along a first direction, and the secondary grid line is cross-connected with the first main grid line.

9. The photovoltaic panel according to claim 8, characterized in that: There are multiple first main grid lines, multiple second main grid lines and multiple auxiliary grid lines, multiple first main grid lines are evenly spaced along the first direction, multiple second main grid lines are evenly spaced along the second direction, and multiple auxiliary grid lines are distributed between two adjacent second main grid lines.

10. A photovoltaic module, characterized in that: include: The photovoltaic panel according to any one of claims 1 to 9.

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