Battery string and photovoltaic module

Abstract

The utility model discloses a battery string and a photovoltaic assembly, the battery string comprises a first battery, a second battery and electric connecting pieces, the first battery and the second battery are arranged at intervals in a first direction, and a plurality of electric connecting pieces are respectively connected between the first battery and the second battery. The plurality of electric connecting pieces extend in a first direction and are arranged at intervals in a second direction, and the first direction is perpendicular to the second direction; wherein the plurality of electric connecting pieces comprise end electric connecting pieces and middle electric connecting pieces, in the second direction, the middle electric connecting pieces are located between the end electric connecting pieces at the two ends, and the section shape of at least one part of the middle electric connecting pieces is different from the section shape of at least one part of the end electric connecting pieces; the cross-sectional area of at least one part of the middle electric connecting pieces is different from that of at least one part of the end electric connecting pieces. Through the arrangement, the end electric connecting pieces and the middle electric connecting pieces can be differentiated, so that stress concentration of the electric connecting pieces can be prevented, and the electric connecting pieces are prevented from being broken.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and more particularly to a battery string and a photovoltaic module. Background Art

[0002] At present, the adjacent two batteries in a battery string are connected by circular electrical connectors. However, the contact area between the circular electrical connector and the battery is small, which is likely to cause the electrical connector to break. If the flattening technology is adopted, the contact area between the circular electrical connector and the battery can be increased. However, the flattened electrical connector stands upright, resulting in more serious breakage. In particular, the two outermost electrical connectors are most likely to crack, thus reducing the yield rate of photovoltaic modules. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a battery string which can improve the strength of the electrical connector, thereby preventing the electrical connector from breaking, and further improving the yield rate of photovoltaic modules.

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

[0005] The battery string according to the utility model includes: a first battery, a second battery, and electrical connectors. The first battery and the second battery are arranged in a first direction. A plurality of the electrical connectors are respectively connected between the first battery and the second battery. The plurality of the electrical connectors extend in the first direction and are spaced apart in a second direction. The first direction and the second direction are perpendicular to each other. Among them, the plurality of the electrical connectors include: end electrical connectors and middle electrical connectors. In the second direction, the middle electrical connectors are located between the end electrical connectors at both ends. At least a part of the cross-sectional shape of at least a part of the middle electrical connectors is different from that of at least a part of the end electrical connectors, and / or at least a part of the cross-sectional area of at least a part of the middle electrical connectors is different from that of at least a part of the end electrical connectors.

[0006] By arranging the electrical connectors between the first battery and the second battery, the battery string according to the utility model can electrically connect the first battery and the second battery, thereby improving the power generation efficiency of the battery string. Moreover, at least one of the cross-sectional shape and the cross-sectional area of the end electrical connectors and the middle electrical connectors is different. Such an arrangement can make the end electrical connectors and the middle electrical connectors different, thereby preventing stress concentration of the electrical connectors and preventing the electrical connectors from breaking, and further improving the yield rate of photovoltaic modules.

[0007] In some examples of the present utility model, the cross-section of the end electrical connector has the same shape as the cross-section of the middle electrical connector, and the cross-sectional area of the end electrical connector is smaller than the cross-sectional area of the middle electrical connector.

[0008] In some examples of the present utility model, the cross-sections of both the end electrical connector and the middle electrical connector are circular, and the cross-sectional diameter of the end electrical connector is smaller than the cross-sectional diameter of the middle electrical connector.

[0009] In some examples of the present utility model, there are multiple middle electrical connectors, the cross-sectional diameters of the multiple middle electrical connectors are the same, and the cross-sectional diameters of the end electrical connectors at both ends are the same.

[0010] In some examples of the present utility model, the cross-section of a part of the end electrical connector has the same shape as the cross-section of the middle electrical connector, and the cross-section of another part of the end electrical connector is non-circular and different from the cross-section of the middle electrical connector.

[0011] In some examples of the present utility model, the cross-sections of a part of the end electrical connector and the middle electrical connector are both circular, and the cross-section of another part of the end electrical connector is flat.

[0012] In some examples of the present utility model, the end electrical connector includes: a first connection section and a second connection section. The first connection section is connected to the front surface of the first battery, the cross-section of the first connection section is circular, the second connection section is connected to the back surface of the second battery and is connected to the first connection section, and the cross-section of the second connection section is flat.

[0013] In some examples of the present utility model, the second connection section includes: a first section, a second section, and a third section. The extending direction of the first section is the same as the length direction of the first connection section and is connected to the first connection section. The second section is connected to the first section and is bent relative to the first section. The third section is arranged parallel to the first section and is connected to the second section. The third section is connected to the back surface of the second battery.

[0014] In some examples of the present utility model, the first battery is provided with a plurality of first sub-grid lines, the plurality of first sub-grid lines are spaced apart in the first direction and extend in the second direction; the second battery is provided with a plurality of second sub-grid lines, the plurality of second sub-grid lines are spaced apart in the first direction and extend in the second direction; wherein, the plurality of electrical connectors are respectively connected to the plurality of first sub-grid lines and the plurality of second sub-grid lines.

[0015] The photovoltaic module according to the present utility model includes: the battery string described above.

[0016] Compared with the prior art, the utility model adopts a method of arranging an electrical connector between the first battery and the second battery, and forming a difference between the end electrical connector and the middle electrical connector, so that the first battery and the second battery can be electrically connected, thereby improving the power generation efficiency of the battery string. Moreover, at least one of the cross-sectional shapes and cross-sectional areas of the end electrical connector and the middle electrical connector is different, so as to prevent stress concentration of the electrical connector and prevent the electrical connector from breaking, thereby improving the yield rate of the photovoltaic module.

[0017] Additional aspects and advantages of the utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic structural diagram of a battery string according to an embodiment of the utility model;

[0020] Figure 2 is a schematic structural diagram of an end electrical connector;

[0021] Figure 3 is a schematic partial structural diagram of a battery string according to an embodiment of the utility model.

[0022] Reference Signs:

[0023] 100, battery string;

[0024] 10, first battery; 20, second battery; 30, electrical connector; 31, end electrical connector; 32, middle electrical connector; 33, first connection section; 34, second connection section; 35, first section; 36, second section; 37, third section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The embodiments of the utility model will be described in detail below. The embodiments described with reference to the drawings are exemplary. The embodiments of the utility model will be described in detail below.

[0026] Reference will be made below to Figures 1 - 3 describe the battery string 100 according to an embodiment of the utility model, and the battery string 100 is applied to a photovoltaic module.

[0027] As Figure 1As shown, the battery string 100 according to the present utility model includes: a first battery 10, a second battery 20, and an electrical connector 30. The first battery 10 and the second battery 20 are arranged in a first direction. A plurality of electrical connectors 30 are respectively connected between the first battery 10 and the second battery 20. The plurality of electrical connectors 30 extend in the first direction and are spaced apart in a second direction, and the first direction and the second direction are perpendicular; wherein, the plurality of electrical connectors 30 include: an end electrical connector 31 and a middle electrical connector 32. In the second direction, the middle electrical connector 32 is located between the end electrical connectors 31 at both ends. The cross-sectional shape of at least a part of the middle electrical connector 32 is different from the cross-sectional shape of at least a part of the end electrical connector 31, and / or the cross-sectional area of at least a part of the middle electrical connector 32 is different from the cross-sectional area of at least a part of the end electrical connector 31.

[0028] It can be understood that the first battery 10, the second battery 20, and the electrical connector 30 constitute the main structure of the battery string 100. The first direction is the length direction of the battery string 100, and the second direction is the width direction of the battery string 100. The first battery 10 and the second battery 20 are arranged in the first direction, so that the required power of the battery string 100 can be satisfied, and the layout area of the battery string 100 can also be increased. A plurality of electrical connectors 30 are arranged between the first battery 10 and the second battery 20, and the plurality of electrical connectors 30 extend in the first direction. Such a setting can enable the plurality of electrical connectors 30 to connect the first battery 10 and the second battery 20. The plurality of connectors are spaced apart in the second direction, so that the power between the first battery 10 and the second battery 20 can flow, and the layout of the battery string 100 can be optimized, and thus the power generation efficiency of the battery string 100 can be improved.

[0029] For example, the first battery 10 and the second battery 20 are arranged in a non-spacing and staggered manner. Specifically, the first battery 10 and the second battery 20 are partially stacked in the thickness direction of the first battery 10 and partially staggered, that is, the first battery 10 and the second battery 20 are arranged in the first direction. Such a setting can save the occupied space of the battery string 100, so that more first batteries 10 and second batteries 20 can be arranged in a limited space, and thus the power generation efficiency of the battery string 100 can be improved. Another example is that the first battery 10 and the second battery 20 are arranged in a spaced and staggered manner. Such a setting facilitates the connection of the plurality of electrical connectors 30 to the first battery 10 and the second battery 20, so that the power between the first battery 10 and the second battery 20 can flow, and thus the power generation efficiency of the battery string 100 can be improved.

[0030] Among them, the end electrical connector 31 and the middle electrical connector 32 constitute the main structure of the electrical connector 30. The end electrical connector 31 in each electrical connector 30 is located at both ends of the middle electrical connector 32 in the second direction. Such a setting can make the end electrical connector 31 located on both sides of the middle electrical connector 32, and the cross-sectional shapes of the end electrical connector 31 and the middle electrical connector 32 are different, and the cross-sectional areas of the end electrical connector 31 and the middle electrical connector 32 are different. This can create a difference between the end electrical connector 31 and the middle electrical connector 32, thereby preventing stress concentration of the electrical connector 30 and preventing the electrical connector 30 from breaking, and further improving the yield rate of the photovoltaic module. For example, the electrical connector 30 is a solder strip, which facilitates the connection of the electrical connector 30 to the first battery 10 and the second battery 20.

[0031] Thus, by providing the electrical connector 30 between the first battery 10 and the second battery 20, the first battery 10 and the second battery 20 can be electrically connected, thereby improving the power generation efficiency of the battery string 100. Moreover, at least one of the cross-sectional shape and the cross-sectional area of the end electrical connector 31 and the middle electrical connector 32 is different. Such a setting can create a difference between the end electrical connector 31 and the middle electrical connector 32, thereby preventing stress concentration of the electrical connector 30 and preventing the electrical connector 30 from breaking, and further improving the yield rate of the photovoltaic module.

[0032] Among them, as Figure 1 shown, the cross-section of the end electrical connector 31 and the cross-section of the middle electrical connector 32 have the same shape, and the cross-sectional area of the end electrical connector 31 is smaller than the cross-sectional area of the middle electrical connector 32.

[0033] It can be understood that the cross-sections of the end electrical connector 31 and the middle electrical connector 32 have the same shape. Such a setting facilitates the manufacturing and installation of the electrical connector 30, thereby facilitating the connection of the electrical connector 30 to the first battery 10 and the second battery 20. Moreover, the cross-sectional area of the end electrical connector 31 is smaller than the cross-sectional area of the middle electrical connector 32. Such a setting can make the stress concentrate on the middle electrical connector 32, and can also reduce the force on the end electrical connector 31, thereby preventing the end electrical connector 31 from breaking, and further improving the yield rate of the photovoltaic module.

[0034] In addition, as Figure 1 shown, the cross-sections of both the end electrical connector 31 and the middle electrical connector 32 are circular, and the cross-sectional diameter of the end electrical connector 31 is smaller than the cross-sectional diameter of the middle electrical connector 32.

[0035] That is to say, the cross-sections of the end electrical connector 31 and the middle electrical connector 32 are both circular. Such a setting enables the electrical connector 30 to be a circular solder strip, thereby improving the current flow efficiency between the first battery 10 and the second battery 20. Moreover, the cross-sectional diameter of the end electrical connector 31 is smaller than that of the middle electrical connector 32. Such a setting can concentrate stress on the middle electrical connector 32 and reduce the force on the end electrical connector 31, thus preventing the fracture of the end electrical connector 31 and further improving the yield rate of the photovoltaic module. For example, the cross-sectional diameter of the end electrical connector 31 is 0.22 mm - 0.24 mm, and the cross-sectional diameter of the middle electrical connector 32 is 0.26 mm. Such a setting can create a difference between the end electrical connector 31 and the middle electrical connector 32, thereby preventing stress concentration in the electrical connector 30 and preventing the electrical connector 30 from breaking.

[0036] In particular, as Figure 1 shown, there are multiple middle electrical connectors 32, and the cross-sectional diameters of the multiple middle electrical connectors 32 are the same, and the cross-sectional diameters of the end electrical connectors 31 at both ends are the same. It can be understood that the multiple middle electrical connectors 32 are located between the end electrical connectors 31, the cross-sectional diameters of the multiple middle electrical connectors 32 are the same, and the cross-sectional diameters of the end electrical connectors 31 are the same. Such a setting can ensure the integration and convenience of the manufacturing of the electrical connector 30, and can also ensure the power connection between the multiple middle electrical connectors 32 and the first battery 10 and the second battery 20, thereby ensuring the power-on efficiency of the battery string 100.

[0037] In addition, as Figure 1 shown, the cross-sectional shape of a part of the end electrical connector 31 is the same as that of the middle electrical connector 32, and the cross-section of another part of the end electrical connector 31 is non-circular and different from the cross-sectional shape of the middle electrical connector 32. That is to say, the cross-sectional shape of a part of the end electrical connector 31 is the same as that of the middle electrical connector 32, and the other part is different from the cross-sectional shape of the middle electrical connector 32, so that a difference can be formed between the end electrical connector 31 and the middle electrical connector 32. The middle electrical connector 32 has a circular cross-section, and a part of the end electrical connector 31 has a non-circular cross-section. Such a setting can ensure the current flow efficiency of the electrical connector 30 and prevent the electrical connector 30 from breaking, and further improve the yield rate of the photovoltaic module.

[0038] In addition, as Figure 1 shown, the cross-sectional shapes of a part of the end electrical connector 31 and the middle electrical connector 32 are both circular, and the cross-section of another part of the end electrical connector 31 is flat.

[0039] It can be understood that a part of the cross-section of the end electrical connector 31 has the same shape as the cross-section of the middle electrical connector 32, that is, a part of the cross-section of the end electrical connector 31 and the cross-section of the middle electrical connector 32 are both circular. Such a setting can improve the current flow efficiency between the first battery 10 and the second battery 20 for the middle electrical connector 32 and a part of the end electrical connector 31 with a circular cross-section. Another part of the cross-section of the end electrical connector 31 is flat, and such a setting can increase the contact area between the end electrical connector 31 and the first battery 10 and the second battery 20, thereby improving the power flow efficiency between the first battery 10 and the second battery 20, and further improving the performance of the battery string 100.

[0040] Among them, as Figure 2 shown, the end electrical connector 31 includes: a first connection section 33 and a second connection section 34. The first connection section 33 is connected to the front surface of the first battery 10, and the cross-section of the first connection section 33 is circular. The second connection section 34 is connected to the back surface of the second battery 20 and is connected to the first connection section 33, and the cross-section of the second connection section 34 is flat.

[0041] That is to say, the first connection section 33 and the second connection section 34 constitute the main structure of the end electrical connector 31. The first connection end is located on the front surface of the first battery 10, the second connection section 34 is located on the back surface of the second battery 20, and the first connection section 33 and the second connection section 34 are connected. Thus, the first battery 10 and the second battery 20 can be connected through the first connection section 33 and the second connection section 34, and the layout structure of the first connection section 33 and the second connection section 34 can also be optimized, thereby improving the power generation efficiency of the battery string 100. Moreover, the cross-section of the first connection section 33 is circular, and the cross-section of the second connection section 34 is flat. Such a setting can enable the first connection section 33 to ensure the power flow between the first battery 10 and the second battery 20, the second connection section 34 can increase the connection area with the second battery 20, and the first connection section 33 and the second connection section 34 can also form a differential design, thereby preventing stress concentration of the end electrical connector 31 and preventing the end electrical connector 31 from breaking, and further improving the yield rate of the photovoltaic module.

[0042] In addition, as Figure 3 shown, the second connection section 34 includes: a first section 35, a second section 36, and a third section 37. The extending direction of the first section 35 is the same as the length direction of the first connection section 33 and is connected to the first connection section 33. The second section 36 is connected to the first section 35 and is bent relative to the first section 35. The third section 37 is arranged in parallel with the first section 35 and is connected to the second section 36. The third section 37 is connected to the back surface of the second battery 20.

[0043] It can be understood that the first section 35, the second section 36 and the third section 37 constitute the main structure of the second connection section 34. The first section 35 is connected to the first connection section 33, so that the first connection section 33 and the second connection section 34 can be connected. Furthermore, it can be ensured that the first battery 10 and the second battery 20 are connected through the first connection section 33 and the second connection section 34. One end of the second section 36 is connected to the first section 35, and the other end is connected to the third section 37. Moreover, the first section 35 and the third section 37 are arranged in parallel, and the second section 36 is bent relative to the first section 35 and the third section 37, so that the contact area between the first section 35 and the third section 37 and the second battery 20 can be increased, and the structural layout of the second connection section 34 can be optimized. Furthermore, the performance of the battery string 100 can be improved.

[0044] In addition, as Figure 1 shown, the first battery 10 is provided with a plurality of first sub-grid lines, and the plurality of first sub-grid lines are spaced apart in the first direction and extend in the second direction; the second battery 20 is provided with a plurality of second sub-grid lines, and the plurality of second sub-grid lines are spaced apart in the first direction and extend in the second direction; wherein, the plurality of electrical connectors 30 are respectively connected to the plurality of first sub-grid lines and the plurality of second sub-grid lines.

[0045] That is to say, a plurality of first sub-grid lines are arranged on the first battery 10, and a plurality of second sub-grid lines are arranged on the second battery 20. The plurality of first sub-grid lines are spaced apart in the first direction, so that the current can be evenly distributed throughout the battery string 100. Such a setting can make the current transfer power between the battery strings 100 relatively large, and can also reduce current concentration. Furthermore, the stability of the battery string 100 can be improved. Moreover, the plurality of first sub-grid lines can share the current load, so that the resistance of a single welding point or connection can be reduced, as well as the overall resistance and energy loss can be reduced.

[0046] Similarly, the plurality of second sub-grid lines are spaced apart in the first direction, so that the current can be evenly distributed throughout the battery string 100. Such a setting can make the current transfer power between the battery strings 100 relatively large, and can also reduce current concentration. Furthermore, the stability of the battery string 100 can be improved.

[0047] According to the photovoltaic module of the present invention, it includes: the battery string 100 of the above embodiment. By providing the electrical connector 30 between the first battery 10 and the second battery 20, the first battery 10 and the second battery 20 can be electrically connected, and furthermore, the power generation efficiency of the battery string 100 can be improved. Moreover, at least one of the cross-sectional shape and the cross-sectional area of the end electrical connector 31 and the middle electrical connector 32 is different. Such a setting can make the end electrical connector 31 and the middle electrical connector 32 form a difference, so as to prevent stress concentration of the electrical connector 30 and prevent the electrical connector 30 from breaking. Furthermore, the yield rate of the photovoltaic module can be improved.

[0048] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0049] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0050] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0051] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery string (100), characterized in that: include: A first battery (10) and a second battery (20), wherein the first battery (10) and the second battery (20) are arranged in a first direction; A plurality of electrical connectors (30), wherein the plurality of electrical connectors (30) are respectively connected between the first battery (10) and the second battery (20), and the plurality of electrical connectors (30) extend in the first direction and are arranged at intervals in a second direction, and the first direction is perpendicular to the second direction; The plurality of electrical connectors (30) include: end electrical connectors (31) and middle electrical connectors (32); in the second direction, the middle electrical connector (32) is located between the end electrical connectors (31) at both ends; the cross-sectional shape of at least a portion of the middle electrical connector (32) is different from the cross-sectional shape of at least a portion of the end electrical connector (31), and / or the cross-sectional area of ​​at least a portion of the middle electrical connector (32) is different from the cross-sectional area of ​​at least a portion of the end electrical connector (31).

2. The battery string (100) according to claim 1, characterized in that: The cross-section of the end electrical connector (31) and the cross-section of the middle electrical connector (32) are of the same shape, and the cross-section area of ​​the end electrical connector (31) is smaller than the cross-section area of ​​the middle electrical connector (32).

3. The battery string (100) according to claim 2, characterized in that: The cross-section of the end electrical connector (31) and the cross-section of the middle electrical connector (32) are both circular, and the cross-section diameter of the end electrical connector (31) is smaller than the cross-section diameter of the middle electrical connector (32).

4. The battery string (100) according to claim 3, characterized in that: There are a plurality of middle electrical connectors (32), the cross-sectional diameters of the plurality of middle electrical connectors (32) are the same, and the cross-sectional diameters of the end electrical connectors (31) at both ends are the same.

5. The battery string (100) according to claim 1, characterized in that: The cross section of a portion of the end electrical connector (31) is the same as the cross section of the middle electrical connector (32), and the cross section of another portion of the end electrical connector (31) is non-circular and different from the cross section of the middle electrical connector (32).

6. The battery string (100) according to claim 5, characterized in that: The cross-section of a part of the end electrical connector (31) and the cross-section of the middle electrical connector (32) are both circular, and the cross-section of another part of the end electrical connector (31) is flat.

7. The battery string (100) according to claim 6, characterized in that: The end electrical connector (31) comprises: A first connecting section (33), the first connecting section (33) being connected to the front surface of the first battery (10), and the cross section of the first connecting section (33) being circular; A second connecting section (34), the second connecting section (34) is connected to the back side of the second battery (20) and is connected to the first connecting section (33), and the cross section of the second connecting section (34) is flat.

8. The battery string (100) according to claim 7, characterized in that: The second connecting section (34) comprises: A first section (35), the first section (35) extending in the same direction as the length direction of the first connecting section (33) and connected to the first connecting section (33); a second section (36), the second section (36) being connected to the first section (35) and being bent relative to the first section (35); A third section (37), the third section (37) is arranged in parallel with the first section (35) and connected to the second section (36), and the third section (37) is connected to the back side of the second battery (20).

9. The battery string (100) according to claim 1, characterized in that: The first battery (10) is provided with a plurality of first secondary grid lines, the plurality of first secondary grid lines are arranged at intervals in the first direction and extend in the second direction; The second battery (20) is provided with a plurality of second secondary grid lines, the plurality of second secondary grid lines are arranged at intervals in the first direction and extend in the second direction; Wherein, the plurality of electrical connectors (30) are respectively connected to the plurality of the first auxiliary grid lines and the plurality of the second auxiliary grid lines.

10. A photovoltaic module, characterized in that: include: The battery string (100) according to any one of claims 1 to 9.

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