Battery assembly and photovoltaic system

Abstract

The application is suitable for the photovoltaic technical field, and provides a battery assembly and a photovoltaic system, which comprises a first battery unit and a second battery unit arranged in sequence along a first direction, the first battery unit comprises a plurality of first battery pieces and a plurality of first welding strips arranged on each first battery piece, and the second battery unit comprises a plurality of second battery pieces and a plurality of second welding strips arranged on each second battery piece; the plurality of first welding strips of the first battery unit and the plurality of second welding strips of the second battery unit are arranged in first axis symmetry, so that the welding strips of the battery assembly can be quickly arranged; in the application, the first welding strip adjacent to the edge of the first battery unit is insulated from the first output bus bar, and the first welding strip adjacent to the edge of the first battery unit does not need to be welded with the first output bus bar, thereby avoiding the problem that the first welding strip adjacent to the edge of the first battery unit and the first output bus bar are false-welded due to the limited space after the first output bus bar is bent.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic technology, and in particular relates to a battery module and a photovoltaic system. Background Technology

[0002] Back-contact battery modules typically consist of an array of back-contact battery cells. The cells are connected in series with solder strips to form a battery string. Busbars are generally used to connect the ends of the battery strings for current collection. The busbars are then bent and connected to the junction box. Due to space constraints, incomplete soldering can easily occur at the bends of the busbars and during the soldering process, affecting long-term reliability. Utility Model Content

[0003] This application provides a battery assembly designed to address the problem that, due to space constraints after the busbar is bent, incomplete soldering can easily occur at the bend of the busbar and during the welding process of the solder strip, affecting long-term reliability.

[0004] In one aspect, this application is implemented as follows: a battery assembly includes: A first battery unit and a second battery unit are arranged sequentially along a first direction. The first battery unit includes at least one battery string, the battery string includes a plurality of first battery cells and a plurality of first solder strips disposed on each of the first battery cells. The second battery unit includes at least one battery string, the battery string includes a plurality of second battery cells and a plurality of second solder strips disposed on each of the second battery cells. The plurality of first solder strips and the plurality of second solder strips are arranged symmetrically about a first axis; The first output busbar is disposed on the first battery cell, with a portion of the first solder strip connected to the first output busbar and another portion of the first solder strip insulated from the first output busbar; The second output busbar is disposed on the second battery cell, with a portion of the second solder strip connected to the second output busbar and another portion of the second solder strip insulated from the second output busbar; The first solder strip adjacent to the edge of the first battery cell and close to the first axis is insulated from the first output busbar, and the second solder strip adjacent to the edge of the second battery cell and close to the first axis is insulated from the second output busbar.

[0005] Optionally, the first battery cell includes a plurality of battery strings arranged in parallel along the first direction, and each battery string includes a plurality of the first battery cells arranged in series along the second direction. The second battery cell also includes a plurality of battery strings arranged in parallel along the first direction, and each battery string includes a plurality of second battery cells arranged in series along the second direction.

[0006] Optionally, the plurality of first battery cells include an end first battery cell located at the end of the first battery cell and an adjacent end first battery cell disposed adjacent to the end first battery cell.

[0007] Optionally, the first end battery cell and the first adjacent end battery cell are partially overlapped in a second direction.

[0008] Optionally, the end first battery cell and the adjacent end first battery cell are spaced apart in a second direction. Optionally, the first output busbar is disposed on the adjacent first battery cell, and a first insulating element is disposed between the first output busbar and the adjacent first battery cell.

[0009] Optionally, the first output busbar is disposed on the first end battery cell, and a first insulating member is disposed between the first output busbar and the first end battery cell.

[0010] Optionally, a portion of the first output busbar is disposed on the end first battery cell, and another portion of the first output busbar is disposed on the adjacent end first battery cell; at least one of the first output busbar and the adjacent end first battery cell, and the first output busbar and the end first battery cell, is provided with the first insulating member.

[0011] Optionally, all the first solder strips and the first output busbars disposed on the adjacent first battery cell are insulated, and a portion of the first solder strips and the first output busbars disposed on the end first battery cell are connected.

[0012] Optionally, the plurality of second battery cells include an end second battery cell located at the end of the second battery cell and an adjacent end second battery cell disposed adjacent to the end second battery cell.

[0013] Optionally, the end second battery cell and the adjacent end second battery cell are partially overlapped in a second direction.

[0014] Optionally, the end second battery cell and the adjacent end second battery cell are spaced apart in a second direction.

[0015] Optionally, the second output busbar is disposed on the adjacent second battery cell, and a second insulating member is disposed between the second output busbar and the adjacent second battery cell.

[0016] Optionally, the second output busbar is disposed on the end second battery cell, and a second insulating member is disposed between the second output busbar and the end second battery cell.

[0017] Optionally, a portion of the second output busbar is disposed on the end second battery cell, and another portion of the second output busbar is disposed on the adjacent end second battery cell; at least one of the second output busbar and the adjacent end second battery cell, and the second output busbar and the end second battery cell, is provided with the second insulating member.

[0018] Optionally, all the second solder strips and the second output busbars disposed on the adjacent second cell are insulated, and a portion of the second solder strips and the second output busbars disposed on the end second cell are connected.

[0019] Optionally, the system further includes a junction box and a diode disposed within the junction box. The junction box has a first terminal and a second terminal. The diode is connected between the first terminal and the second terminal. The first terminal and the second terminal have opposite polarities. The first output busbar is connected to the first terminal of the junction box, and the second output busbar is connected to the second terminal of the junction box.

[0020] Optionally, the reverse bias voltage of the diode is greater than or equal to 90V.

[0021] Optionally, the first output busbar includes a first busbar portion disposed on the first battery unit, a first wiring portion extending in a direction away from the first battery unit, and a first connecting portion disposed between the first busbar portion and the first wiring portion, wherein the first connecting portion is stacked on top of the first busbar portion.

[0022] Optionally, the width of the first wiring portion is less than or equal to the width of the first bus portion.

[0023] Optionally, the second output busbar includes a second bus section disposed on the second battery cell, a second wiring section extending in a direction away from the second battery cell, and a second connecting section disposed between the second bus section and the second wiring section, wherein the second connecting section is stacked on top of the second bus section.

[0024] Optionally, the width of the second wiring portion is less than or equal to the width of the second bus portion.

[0025] Optionally, the first end of each battery string in the first battery cell is connected to the first output busbar, and the second end of each battery string in the first battery cell is connected to the first parallel busbar.

[0026] Optionally, the first end of each battery string in the second battery cell is connected to the second output busbar, and the second end of each battery string in the second battery cell is connected to the second parallel busbar.

[0027] Optionally, the first parallel busbar and the second parallel busbar are connected to connect the first battery cell and the second battery cell in series.

[0028] Optionally, the first battery cell is a sliced ​​battery formed by dividing a whole battery cell into three equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into three equal parts.

[0029] Optionally, the first battery cell is a sliced ​​battery formed by dividing a whole battery cell into four equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into four equal parts.

[0030] Optionally, the first battery cell is a sliced ​​battery formed by dividing a whole battery cell into five equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into five equal parts.

[0031] In this application, the first battery unit and the second battery unit are arranged adjacent to each other, and the plurality of first solder strips of the first battery unit and the plurality of second solder strips of the second battery unit are symmetrically arranged about a first axis, which facilitates the rapid arrangement of the solder strips of the battery assembly. In this application, the first solder strips near the edge of the first battery unit and close to the first axis are insulated from the first output busbar. The first solder strips near the edge of the first battery unit and close to the first axis do not need to be welded to the first output busbar, avoiding the problem of poor soldering between the first solder strips near the edge of the first battery unit and the first output busbar due to space constraints after the first output busbar is bent. In addition, since the first solder strips near the edge of the first battery unit and close to the first axis are insulated from the first output busbar, the stacking height at this point is reduced, reducing the risk of microcracks in the battery cells at the edge of the first battery unit. Similarly, the second solder strips near the edge of the second battery unit and close to the first axis are insulated from the second output busbar, which also avoids the problem of poor soldering between the second solder strips near the edge of the second battery unit and the second output busbar due to space constraints after the second output busbar is bent, and reduces the risk of microcracks in the battery cells at the edge of the second battery unit.

[0032] Secondly, a photovoltaic system includes the battery module described in the first aspect. The technical effects of this application are the same as those of the aforementioned battery module, and will not be repeated here. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of the first type of battery assembly provided in the current application; Figure 2 yes Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3This is a partial structural schematic diagram of the first type of battery assembly provided in the current application; Figure 4 This is a schematic diagram of the circuit structure of the first type of battery assembly provided in this application; Figure 5 This is a structural schematic diagram of the second type of battery assembly provided in the current application; Figure 6 This is a structural schematic diagram of the third type of battery assembly provided in the current application.

[0034] Explanation of reference numerals in the attached figures: 100, First battery cell; 101, First battery cell; 101a, End first battery cell; 101b, Adjacent first battery cell; 102, First solder strip; 200, Second battery cell; 201, Second battery cell; 201a, End second battery cell; 201b, Adjacent second battery cell; 202, Second solder strip; 300, First output busbar; 301, First busbar section; 302, First wiring section; 303, First connection section; 400, Second output busbar; 401, Second busbar section; 402, Second wiring section; 403, Second connection section; 500, Junction box; 600, First insulating component; 700, Second insulating component; 800, Diode; 901, First parallel busbar; 902, Second parallel busbar. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0036] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] like Figure 1 and Figure 2As shown in the embodiments of this application, a battery assembly includes a first battery unit 100 and a second battery unit 200 arranged sequentially along a first direction. That is, the first battery unit 100 and the second battery unit 200 are arranged adjacent to each other. Exemplarily, the first battery unit 100 and the second battery unit 200 may be spaced apart in the first direction, or the first battery unit 100 and the second battery unit 200 may be partially overlapped in the first direction. This application does not impose any restrictions on this.

[0042] The first battery unit 100 includes at least one battery string, each battery string including multiple first battery cells 101 and multiple first solder ribbons 102 disposed on each first battery cell 101. The second battery unit 200 includes at least one battery string, each battery string including multiple second battery cells 201 and multiple second solder ribbons 202 disposed on each second battery cell 201. It is understood that the first battery cell 101 includes anisotropic first electrode region and second electrode region located on the back side of the first battery cell 101. A portion of the first solder ribbons 102 are disposed on the first electrode region, and another portion of the first solder ribbons 102 are disposed on the second electrode region. Thus, the current on the first battery cell 101 can... The first solder ribbon 102 conducts the current, connecting adjacent first battery cells 101 to different polarity regions, forming a battery string. Similarly, the second battery cell 201 includes a first electrode region and a second electrode region of opposite polarity located on the back of the second battery cell 201. A portion of the second solder ribbon 202 is disposed in the first electrode region, and another portion of the second solder ribbon 202 is disposed in the second electrode region. In this way, the current on the second battery cell 201 can be conducted by the second solder ribbon 202, connecting adjacent second battery cells 201 to different polarity regions, forming a battery string.

[0043] The aforementioned solar cells (first solar cell 101 or second solar cell 201) can be made of semiconductor materials, such as P-type silicon wafers, which form a PN junction after phosphorus diffusion. Alternatively, N-type silicon wafers can be used, which form a PN junction after boron diffusion; this is not a limitation. When the semiconductor structure absorbs sunlight, it generates electron-hole pairs. These pairs are separated by the built-in electric field of the PN junction within the semiconductor. Electrons flow into the N-region, and holes flow into the P-region, thus forming a photogenerated electric field. Typically, a solar cell has a sheet-like structure. The side that absorbs light energy and converts it into electrical energy is called the light-absorbing surface or front side, and the other side is called the back side. A solar cell with electrodes of both polarities formed on the back side is a back-contact cell. In this embodiment, when the solar cell is installed normally, the side facing upwards is called the front side, and the side opposite the front side is called the back side.

[0044] The aforementioned solar cells (first solar cell 101 or second solar cell 201) are all substantially rectangular. A substantially rectangular solar cell can be, for example, a square or another type of rectangle, and can have standard corners, cut corners, or rounded corners, depending on actual production needs; no specific limitation is made here. The number of first electrode areas and second electrode areas is determined based on the actual size of the solar cell, and no specific limitation is made here.

[0045] It is also understood that in the first battery unit 100, each battery string of the first battery unit 100 may include two first battery cells 101 connected in series, three first battery cells 101 connected in series, or a greater number of other first battery cells 101, the specific number of first battery cells 101 to be connected in series can be determined according to the actual usage. In the second battery unit 200, each battery string of the second battery unit 200 may include two second battery cells 201 connected in series, three second battery cells 201 connected in series, or a greater number of other second battery cells 201, the specific number of second battery cells 201 to be connected in series can be determined according to the actual usage. In some embodiments, the first battery unit 100 includes a plurality of battery strings arranged in parallel along a first direction, and each battery string in the first battery unit 100 includes a plurality of first battery cells 101 arranged in series along a second direction; the second battery unit 200 also includes a plurality of battery strings arranged in parallel along the first direction, and each battery string in the second battery unit 200 includes a plurality of second battery cells 201 arranged in series along the second direction. It is understood that the battery strings in the first battery unit 100 and the second battery unit 200 may be three battery strings, four battery strings, or five battery strings, respectively, and there is no limitation herein.

[0046] Multiple first solder strips 102 and multiple second solder strips 202 are arranged symmetrically about a first axis L. Here, symmetrical arrangement of the multiple first solder strips 102 and multiple second solder strips 202 refers to their symmetrical structural arrangement. For example, the placement of the solder strips, the connection structure between the solder strips and the busbar, and the spacing between the solder strips can be set to be completely symmetrical with respect to the first axis L. This symmetrical arrangement of the multiple first solder strips 102 and multiple second solder strips 202 about the first axis facilitates the arrangement of solder strips in the battery module. Without changing the pre-set program, after the solder strip arrangement on the first battery cell 100 is completed, the stringer moves in the reverse direction to arrange the solder strips on the second battery cell 200, simplifying the production process.

[0047] A first output busbar 300 is provided on the first battery cell 100. A portion of the first solder ribbons 102 are connected to the first output busbar 300, while another portion of the first solder ribbons 102 are insulated from the first output busbar 300. Understandably, exemplarily, a portion of the first solder ribbons 102 are all located in the first electrode region, and the other portion of the first solder ribbons 102 are all located in the second electrode region. The first electrode region and the second electrode region are respectively a P region and an N region. The first solder ribbons 102 located in the same polarity region are connected to the first output busbar 300. The first output busbar 300 is used to connect the current of the first battery cell 100 into the junction box 500. The other portion of the first solder ribbons 102 located in the opposite polarity region are insulated from the first output busbar 300 to avoid short circuit of the components.

[0048] Similarly, the second output busbar 400 provided on the second battery unit 200 has a portion of the second solder strips 202 connected to the second output busbar 400, and another portion of the second solder strips 202 insulated from the second output busbar 400. For example, if a portion of the second solder strips 202 are all located in the first electrode region, then the other portion of the second solder strips 202 are all located in the second electrode region. The second solder strips 202 located in the same polarity region are connected to the second output busbar 400. The second output busbar 400 is used to connect the current of the second battery unit 200 into the junction box 500. The other portion of the second solder strips 202 located in the opposite polarity region is insulated from the second output busbar 400 to avoid short circuit of the components.

[0049] Understandably, the first output busbar 300 and the second output busbar 400 are connected to the positive and negative terminals of the junction box 500, respectively, to combine the currents of the first battery cell 100 and the second battery cell 200. It should be noted that if the first solder strip 102 connecting the first output busbar 300 is located within the first electrode region, then the second solder strip 202 connecting the second output busbar 400 is located within the second electrode region. In other words, the first solder strip 102 and the second solder strip 202 are structurally symmetrically arranged around a first axis and connected to opposite polarity regions.

[0050] In some embodiments, the first solder ribbon 102 adjacent to the edge of the first battery cell 100 and close to the first axis is insulated from the first output busbar 300, and the second solder ribbon 202 adjacent to the edge of the second battery cell 200 and close to the first axis is insulated from the second output busbar 400. Understandably, the first solder ribbon 102 adjacent to the edge of the first battery cell 100 and close to the first axis forms a series solder ribbon between adjacent battery cells, eliminating the need for welding to the first output busbar 300, thus reducing the risk of microcracks occurring during the lamination process in the vulnerable edge region of the first battery cell 100. Furthermore, the series solder ribbons between adjacent battery cells are at the same layer height, reducing the overall stack height of the region adjacent to the edge of the first battery cell 100 and close to the first axis, further reducing the risk of microcracks occurring during the lamination process in the vulnerable edge region of the first battery cell 100. Similarly, the second solder ribbon 202 adjacent to the edge of the second battery cell 200 and close to the first axis forms a series solder ribbon between adjacent battery cells, eliminating the need for welding to the second output busbar 400, thus reducing the risk of microcracks occurring during the lamination process in the vulnerable edge region of the second battery cell 200. Furthermore, the series solder strips between adjacent battery cells are at the same layer height, which reduces the overall stacking height of the area near the edge of the second battery cell 200 and close to the first axis, further reducing the risk of microcracks occurring during the lamination process of the fragile edge area of ​​the second battery cell 200.

[0051] In some embodiments, the plurality of first battery cells 101 includes an end first battery cell 101a located at the end of the first battery cell 100 and an adjacent end first battery cell 101b disposed adjacent to the end first battery cell 101a. In this embodiment, the plurality of first battery cells 101 are defined and distinguished according to their location. It can be understood that there should also be first battery cells 101 at other locations arranged sequentially in the second direction. Here, several exemplary descriptions are given according to different situations where the first output busbar 300 is set.

[0052] like Figure 1 and Figure 2As shown, in the first embodiment, the first output busbar 300 is disposed on the adjacent first battery cell 101b, and a first insulating member 600 is disposed between the first output busbar 300 and the adjacent first battery cell 101b. At this time, the first insulating member 600 can be a whole insulating strip. The first insulating member 600 isolates and insulates all the first solder strips 102 and the first output busbar 300 located on the adjacent first battery cell 101b. A portion of the solder strip on the end first battery cell 101a extends to the adjacent first battery cell 101b and connects with the first output busbar 300. Another portion of the first solder strips 102 on the end first battery cell 101a is insulated from the first output busbar 300. Furthermore, the other portion of the first solder strips 102 on the end first battery cell 101a is connected to the corresponding portion of the first solder strips 102 located on the adjacent first battery cell 101b to form a series solder strip. The series solder strip is in the form of a whole long solder strip and is connected in series to two adjacent first battery cells 101 in the second direction.

[0053] like Figure 5 As shown, in the second embodiment, the first output busbar 300 is disposed on the end first battery cell 101a, and a first insulating member 600 is disposed between the first output busbar 300 and the end first battery cell 101a. In this case, the first insulating member 600 can be an insulating strip with multiple exposed areas. The exposed areas partially expose the portion of the first solder strip 102 on the end first battery cell 101a that needs to be connected to the first output busbar 300, facilitating the connection between the first output busbar 300 and a portion of the first solder strip 102. For example, the exposed areas can be a through-hole structure, or the first insulating member 600 can be intermittently disposed to form interval regions. Similarly, another portion of the first solder strip 102 located on the end first battery cell 101a is connected to a corresponding portion of the first solder strip 102 disposed on the adjacent end first battery cell 101b to form a series solder strip. The series solder strip is a single long solder strip, connecting two adjacent first battery cells 101 in the second direction.

[0054] like Figure 6As shown, in the third embodiment, a portion of the first output busbar 300 is disposed on the end first battery cell 101a, and another portion of the first output busbar 300 is disposed on the adjacent end first battery cell 101b; at least one of the first output busbar 300 and the adjacent end first battery cell 101b, and the first output busbar 300 and the end first battery cell 101a, is provided with a first insulating member 600. In other words, the first output busbar 300 spans the end first battery cell 101a and the adjacent first battery cell 101b in the second direction. At this time, the structural form of the first insulating member 600 is selected according to the setting position of the first insulating member 600. Specifically, under different structural forms of the first insulating member 600, the connection form between the part of the first solder strip 102 on the end first battery cell 101a and the first output busbar 300 is as follows: In some embodiments, when the first output busbar 300 spans the end first battery cell 101a and the adjacent first battery cell 101b in the second direction and is in contact with the solder strips on both battery cells, the first output busbar 300 is connected to the part of the first solder strip on the end first battery cell 101a that needs to be connected to the first output busbar 300, and the part of the first solder strip on the end first battery cell 101a that does not need to be connected to the first output busbar 300 is insulated by the first insulating member 600. The first insulating element 600 isolates and insulates all the first solder strips 102 and the first output busbars 300 located on the adjacent first battery cell 101b.

[0055] Understandably, whether a first insulating element 600 is needed to insulate between the solder strips on the end first battery cell 101a and the adjacent battery cell 101b that are not connected to the first output busbar 300 depends on whether they are in contact with the first output busbar 300. For example, when a part of the first output busbar 300 is located on the end first battery cell 101a and another part of the first output busbar 300 is located on the adjacent first battery cell 101b, but the first output busbar 300 is not in contact with any of the solder strips on the end first battery cell 101a and the adjacent battery cell 101b that are not connected to the first output busbar 300 and the distance between them is large, it is not necessary to provide a first insulating element 600 at the corresponding position of the solder strip. Therefore, at least one of the following is provided with a first insulating member 600: between the first output busbar 300 and the adjacent first battery cell 101b, and between the first output busbar 300 and the end first battery cell 101a. It is possible that both are provided with the first insulating member 600, or only one of them is provided with the first insulating member 600. This is not limited here.

[0056] It should be noted that, based on the above embodiments, all the first solder strips 102 and the first output busbars 300 disposed on the adjacent first battery cell 101b are insulated from each other, while some of the first solder strips 102 and the first output busbars 300 disposed on the end first battery cell 101a are connected. Specifically, the insulation between the first solder strips 102 and the first output busbars 300 on the adjacent first battery cell 101b can be in the form that the first solder strips 102 and the first output busbars 300 do not contact each other, or the first solder strips 102 and the first output busbars 300 are isolated and insulated by the first insulating member 600.

[0057] In some embodiments, the end first solar cell 101a and the adjacent first solar cell 101b are partially overlapped in a second direction. That is, the end first solar cell 101a and the adjacent first solar cell 101b overlap a portion of their area in the second direction. For example, the overlap width can range from 0.1 mm, 0.2 mm, 0.4 mm, or 0.5 mm, and this application does not impose any limitation on this. The contact areas between the overlaps are not electrically connected; that is, no conductive adhesive or other bonding agent is needed between the overlap areas. The first solar cells 101 are simply overlapped together. This allows for better concealment of the series solder strips, and the overlapping arrangement of the first solar cells 101 enables the module to accommodate solar cells of more sizes, thereby increasing the module's power output.

[0058] In some embodiments, the end first battery cell 101a and the adjacent first battery cell 101b are spaced apart in a second direction. Exemplarily, the spacing between the end first battery cell 101a and the adjacent first battery cell 101b can be 0mm, 1mm, 2mm, or 3mm, and is not specifically limited herein. The spaced arrangement between the first battery cells 101 provides a buffer space between them, reducing the risk of battery cell merging and preventing the overall length of the first battery cell 100 from becoming excessively long, thus improving the stability of the connection between adjacent first battery cells 101.

[0059] In some embodiments, the plurality of second battery cells 201 includes an end second battery cell 201a located at the end of the second battery cell 200 and an adjacent end second battery cell 201b disposed adjacent to the end second battery cell 201a. In this embodiment, the plurality of second battery cells 201 are defined and distinguished according to their location. It can be understood that there should also be second battery cells 201 at other locations arranged sequentially in the second direction. Here, several exemplary descriptions are given according to different situations where the second output busbar 400 is set.

[0060] In a first embodiment, a second output busbar 400 is disposed on an adjacent second battery cell 201b, and a second insulating member 700 is disposed between the second output busbar 400 and the adjacent second battery cell 201b. In this case, the second insulating member 700 can be a single, continuous insulating strip. The second insulating member 700 isolates and insulates all the second solder strips 202 located on the adjacent second battery cell 201b and the second output busbar 400. A portion of the solder strips located on the end second battery cell 201a extends to the adjacent second battery cell 201b and connects with the second output busbar 400. Another portion of the second solder strips 202 located on the end second battery cell 201a is insulated from the second output busbar 400. Furthermore, the other portion of the second solder strips 202 located on the end second battery cell 201a is connected to the corresponding portion of the second solder strips 202 disposed on the adjacent second battery cell 201b to form a series solder strip. The series solder strip is a single, continuous solder strip that connects two adjacent second battery cells 201 in the second direction.

[0061] In the second embodiment, the second output busbar 400 is disposed on the end second battery cell 201a, and a second insulating member 700 is disposed between the second output busbar 400 and the end second battery cell 201a. In this case, the second insulating member 700 can be an insulating strip with multiple exposed areas. The exposed areas partially expose the portion of the second solder strip 202 on the end second battery cell 201a that needs to be connected to the second output busbar 400, facilitating the connection between the second output busbar 400 and the portion of the second solder strip 202. For example, the exposed areas can be a through-hole structure, or the second insulating member 700 can be intermittently disposed to form interval regions. Similarly, another portion of the second solder strip 202 located on the end second battery cell 201a is connected to a corresponding portion of the second solder strip 202 disposed on the adjacent end second battery cell 201b to form a series solder strip. The series solder strip is a single long solder strip, connecting two adjacent second battery cells 201 in the second direction.

[0062] In the third embodiment, a portion of the second output busbar 400 is disposed on the end second battery cell 201a, and another portion of the second output busbar 400 is disposed on the adjacent end second battery cell 201b; at least one of the second output busbar 400 and the adjacent end second battery cell 201b, and the second output busbar 400 and the end second battery cell 201a, is provided with a second insulating member 700. That is, the second output busbar 400 spans the end second battery cell 201a and the adjacent end second battery cell 201b in the second direction. In this case, the structural form of the second insulating member 700 is selected according to the placement position of the second insulating member 700. Specifically, under different structural forms of the second insulating member 700, the connection form of the portion of the second solder strip 202 on the end second battery cell 201a and the second output busbar 400 is the same as described above, and will not be repeated here.

[0063] It should be noted that, based on the above embodiments, all the second solder strips 202 and the second output busbar 400 disposed on the adjacent second battery cell 201b are insulated from each other, while some of the second solder strips 202 and the second output busbar 400 disposed on the end second battery cell 201a are connected. Specifically, the insulation between the second solder strips 202 and the second output busbar 400 on the adjacent second battery cell 201b can be such that the second solder strips 202 and the second output busbar 400 do not contact each other, or the second solder strips 202 and the second output busbar 400 are isolated and insulated by the second insulating member 700.

[0064] In some embodiments, the end second solar cell 201a and the adjacent second solar cell 201b are partially overlapped in a second direction. That is, the end second solar cell 201a and the adjacent second solar cell 201b overlap a portion of their area in the second direction. For example, the overlap width can range from 0.1 mm, 0.2 mm, 0.4 mm, or 0.5 mm, and this application does not impose any limitation on this. The contact areas between the overlaps are not electrically connected; that is, no conductive adhesive or other bonding agent is needed between the overlap areas. The second solar cells 201 simply overlap each other. This allows for better concealment of the series solder strips, and the overlapping arrangement of the second solar cells 201 enables the module to accommodate solar cells of more sizes, thereby increasing the module's power output.

[0065] In some embodiments, the end second battery cell 201a and the adjacent second battery cell 201b are spaced apart in a second direction. Exemplarily, the spacing between the end second battery cell 201a and the adjacent second battery cell 201b can be 0mm, 1mm, 2mm, or 3mm, and is not specifically limited herein. The spaced arrangement between the second battery cells 201 provides a buffer space between each second battery cell 201, reducing the risk of battery cell merging and preventing the overall length of the battery string from becoming excessively long, thus improving the stability of the connection between adjacent second battery cells 201.

[0066] like Figure 4 and Figure 5As shown, the battery assembly also includes a junction box 500 and a diode 800 disposed within the junction box 500. The junction box 500 has a first terminal and a second terminal. The diode 800 is connected between the first terminal and the second terminal, with opposite polarities. A first output busbar 300 is connected to the first terminal of the junction box 500, and a second output busbar 400 is connected to the second terminal of the junction box 500. The diode 800 connected within the junction box 500 can serve as a bypass circuit, allowing reverse conduction when the battery assembly is blocked, thus preventing hot spot risks. Preferably, the reverse bias voltage of the diode 800 is greater than or equal to 90V. This allows the diode 800 to withstand higher reverse voltages, ensuring reliable protection even under extreme conditions (such as multiple battery failures or high-voltage components).

[0067] like Figure 3 As shown, in some embodiments, the first output busbar 300 includes a first bus portion 301 disposed on the first battery unit 100, a first wiring portion 302 extending in a direction away from the first battery unit 100, and a first connecting portion 303 disposed between the first busbar 301 and the first wiring portion 302, wherein the first connecting portion 303 is stacked on top of the first busbar 301. In this embodiment, through structural optimization design of the first output busbar 300, the first wiring portion 302 is made to be far away from the edge of the first battery unit 100, thereby avoiding damage to the edge of the first battery unit 100 when bending the first output busbar 300. Preferably, the first connecting part 303 and the first busbar 301 are fitted together, so that the first output busbar 300 is subjected to uniform force during lamination, which reduces problems such as cell cracking, misalignment or poor soldering caused by unevenness or protrusion, and improves production quality. Of course, in other embodiments, the first connecting part 303 and the first busbar 301 may not be fitted together, and there may be a gap between the first connecting part 303 and the first busbar 301.

[0068] The width of the first wiring section 302 is less than or equal to the width of the first bus section 301. The first wiring portion 302 needs to pass through the inlet of the junction box 500 and connect to the diode 800 in the junction box 500. Usually, in order to ensure the airtightness of the junction box 500, the inlet width of the junction box 500 is relatively narrow. The width of the first wiring portion 302 is adapted to the width of the inlet of the junction box 500, so that the first wiring portion 302 can be smoothly inserted into the junction box 500. In actual operation, since the first wiring portion 302 is extended from the first bus portion 301, the width of the first wiring portion 302 is usually the same as the width of the first bus portion 301. Thus, the first bus portion 301 also has a relatively narrow width, which is not conducive to current charging. This application can achieve current charging by widening the design of the first bus portion 301 to meet the stable connection with the solder strip. Similarly, the widened first wiring portion 302 is trimmed so that the width of the first wiring portion 302 is adapted to the width of the inlet of the junction box 500. For example, the cutting can be performed along one side of the first wiring portion 302 or along both sides of the first wiring portion 302, depending on the actual situation.

[0069] like Figure 3 As shown, the second output busbar 400 includes a second bus portion 401 disposed on the second battery unit 200, a second wiring portion 402 extending in a direction away from the second battery unit 200, and a second connecting portion 403 disposed between the second bus portion 401 and the second wiring portion 402. The second connecting portion 403 is stacked on top of the second bus portion 401. In this embodiment, through structural optimization design of the second output busbar 400, the second wiring portion 402 is moved away from the edge of the second battery unit 200, thereby avoiding damage to the edge of the second battery unit 200 when bending the second output busbar 400. Preferably, the second connecting part 403 and the second busbar 401 are fitted together, so that the second output busbar 400 is subjected to uniform force during lamination, which reduces problems such as cell cracking, misalignment or poor welding caused by unevenness or protrusion, and improves production quality. Of course, in other embodiments, the second connecting part 403 and the second busbar 401 may not be fitted together, and there may be a gap between the second connecting part 403 and the second busbar 401.

[0070] The width of the second wiring section 402 is less than or equal to the width of the second bus section 401. The second wiring portion 402 needs to pass through the inlet of the junction box 500 and connect to the diode 800 in the junction box 500. Usually, in order to ensure the airtightness of the junction box 500, the inlet width of the junction box 500 is relatively narrow. The width of the second wiring portion 402 is adapted to the width of the inlet of the junction box 500, so that the second wiring portion 402 can be smoothly inserted into the junction box 500. In actual operation, since the second wiring portion 402 is an extension of the second bus portion 401, the width of the second wiring portion 402 is usually the same as the width of the second bus portion 401. In this way, the second bus portion 401 also has a relatively narrow width, which is not conducive to current charging. This application can achieve current charging by widening the design of the second bus portion 401 to meet the stable connection with the solder strip. Similarly, the widened second wiring portion 402 is trimmed so that the width of the second wiring portion 402 is adapted to the width of the inlet of the junction box 500. For example, the cutting can be performed along one side of the second wiring portion 402 or along both sides of the second wiring portion 402, depending on the actual situation.

[0071] In some embodiments, the first end of each battery string included in the first battery unit 100 is connected to the first output busbar 300, and the second end of each battery string included in the first battery unit 100 is connected to the first parallel busbar 901. The number of battery strings included in the first battery unit 100 can be set as needed, and this application does not limit this. After multiple battery strings included in the first battery unit 100 are connected in parallel to form the first battery unit 100, the failure of a single battery string (such as shading or damage) only affects that parallel branch, while other parallel strings can still output current normally, reducing power loss and improving system fault tolerance.

[0072] In some embodiments, the first end of each battery string included in the second battery unit 200 is connected to the second output busbar 400, and the second end of each battery string included in the second battery unit 200 is connected to the second parallel busbar 902. The number of battery strings included in the second battery unit 200 can be set as needed, and this application does not limit this. After multiple battery strings included in the second battery unit 200 are connected in parallel to form the second battery unit 200, the failure of a single battery string (such as shading or damage) only affects that parallel branch, while other parallel strings can still output current normally, reducing power loss and improving system fault tolerance.

[0073] In some embodiments, the first parallel busbar 901 and the second parallel busbar 902 are connected, and the first battery unit 100 and the second battery unit 200 are connected in series. Understandably, one end of the first battery unit 100 and the second battery unit 200 are connected in series via the first parallel busbar 901 and the second parallel busbar 902, and the other end of the first battery unit 100 and the second battery unit 200 are connected in series within the junction box 500 via the first output busbar 300 and the second output busbar 400, facilitating external power supply.

[0074] In some embodiments, the first solar cell 101 is a sliced ​​solar cell formed by dividing a whole solar cell into three equal parts, and / or the second solar cell 201 is a sliced ​​solar cell formed by dividing a whole solar cell into three equal parts. A solar cell (first solar cell 101 or second solar cell 201) is a one-third sliced ​​solar cell, which has a relatively small size, enhancing its resistance to microcracks and reducing the risk of microcracks. Compared to a whole solar cell, the current path is shortened, significantly reducing power loss.

[0075] In some embodiments, the first solar cell 101 is a sliced ​​solar cell formed by dividing a whole solar cell into four equal parts, and / or the second solar cell 201 is a sliced ​​solar cell formed by dividing a whole solar cell into four equal parts. A quarter-slice solar cell (either the first solar cell 101 or the second solar cell 201) has a relatively small size, which enhances its resistance to microcracks and reduces the risk of microcracks. Compared to a whole solar cell, the current path is shortened, significantly reducing power loss.

[0076] In some embodiments, the first solar cell 101 is a sliced ​​solar cell formed by dividing a whole solar cell into five equal parts, and / or the second solar cell 201 is a sliced ​​solar cell formed by dividing a whole solar cell into five equal parts. A solar cell (first solar cell 101 or second solar cell 201) is a one-fifth sliced ​​solar cell, which has a relatively small size, enhancing its resistance to microcracks and reducing the risk of microcracks. Compared to a whole solar cell, the current path is shortened, significantly reducing power loss.

[0077] In some embodiments, a photovoltaic system includes the battery modules as described above. It is understood that the photovoltaic power generation system includes at least one back-contact battery module as described above. It is also understood that the back-contact battery modules can be electrically connected in parallel or in series, depending on actual needs. In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants, and can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system grid as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0078] In the description of this specification, the use of terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., refers to specific features, structures, materials, or characteristics described in connection with the embodiments or examples, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery assembly, characterized in that, include: A first battery unit and a second battery unit are arranged sequentially along a first direction. The first battery unit includes at least one battery string, the battery string includes a plurality of first battery cells and a plurality of first solder strips disposed on each of the first battery cells. The second battery unit includes at least one battery string, the battery string includes a plurality of second battery cells and a plurality of second solder strips disposed on each of the second battery cells. The plurality of first solder strips and the plurality of second solder strips are arranged symmetrically about a first axis; The first output busbar is disposed on the first battery cell, with a portion of the first solder strip connected to the first output busbar and another portion of the first solder strip insulated from the first output busbar; The second output busbar is disposed on the second battery cell, with a portion of the second solder strip connected to the second output busbar and another portion of the second solder strip insulated from the second output busbar; The first solder strip adjacent to the edge of the first battery cell and close to the first axis is insulated from the first output busbar, and the second solder strip adjacent to the edge of the second battery cell and close to the first axis is insulated from the second output busbar.

2. The battery assembly as claimed in claim 1, characterized in that, The first battery unit includes a plurality of battery strings arranged in parallel along the first direction, and each battery string includes a plurality of the first battery cells arranged in series along the second direction. The second battery cell also includes a plurality of battery strings arranged in parallel along the first direction, and each battery string includes a plurality of second battery cells arranged in series along the second direction.

3. The battery assembly as described in claim 1, characterized in that, The plurality of first battery cells include an end first battery cell located at the end of the first battery cell and an adjacent end first battery cell disposed adjacent to the end first battery cell.

4. The battery assembly as described in claim 3, characterized in that, The first battery cell at the end and the first battery cell at the adjacent end are partially overlapped in the second direction.

5. The battery assembly as claimed in claim 3, characterized in that, The first battery cell at the end and the first battery cell at the adjacent end are spaced apart in the second direction.

6. The battery assembly according to any one of claims 3-5, characterized in that, The first output busbar is disposed on the adjacent first battery cell, and a first insulating element is disposed between the first output busbar and the adjacent first battery cell.

7. The battery assembly according to any one of claims 3-5, characterized in that, The first output busbar is disposed on the first end battery cell, and a first insulating member is disposed between the first output busbar and the first end battery cell.

8. The battery assembly according to any one of claims 3-5, characterized in that, A portion of the first output busbar is disposed on the end first battery cell, and another portion of the first output busbar is disposed on the adjacent end first battery cell; at least one of the first output busbar and the adjacent end first battery cell, and the first output busbar and the end first battery cell, is provided with a first insulating member.

9. The battery assembly as claimed in claim 6, characterized in that, All the first solder strips and the first output busbars disposed on the adjacent first battery cell are insulated, and a portion of the first solder strips and the first output busbars disposed on the end first battery cell are connected.

10. The battery assembly as claimed in claim 1, characterized in that, The plurality of second battery cells include an end second battery cell located at the end of the second battery cell and an adjacent end second battery cell disposed adjacent to the end second battery cell.

11. The battery assembly as claimed in claim 10, characterized in that, The end second battery cell and the adjacent end second battery cell are partially overlapped in the second direction.

12. The battery assembly as claimed in claim 10, characterized in that, The end second battery cell and the adjacent end second battery cell are spaced apart in the second direction.

13. The battery assembly according to any one of claims 10-12, characterized in that, The second output busbar is disposed on the adjacent second battery cell, and a second insulating member is disposed between the second output busbar and the adjacent second battery cell.

14. The battery assembly according to any one of claims 10-12, characterized in that, The second output busbar is disposed on the end second battery cell, and a second insulating member is disposed between the second output busbar and the end second battery cell.

15. The battery assembly according to any one of claims 10-12, characterized in that, A portion of the second output busbar is disposed on the end second battery cell, and another portion of the second output busbar is disposed on the adjacent end second battery cell; at least one of the second output busbar and the adjacent end second battery cell, and the second output busbar and the end second battery cell, is provided with a second insulating member.

16. The battery assembly as claimed in claim 13, characterized in that, All the second solder strips and the second output busbars disposed on the adjacent second cell are insulated, and a portion of the second solder strips and the second output busbars disposed on the end second cell are connected.

17. The battery assembly as claimed in claim 1, characterized in that, It also includes a junction box and a diode disposed in the junction box. The junction box has a first terminal and a second terminal. The diode is connected between the first terminal and the second terminal. The polarities of the first terminal and the second terminal are opposite. The first output busbar is connected to the first terminal of the junction box, and the second output busbar is connected to the second terminal of the junction box.

18. The battery assembly as claimed in claim 17, characterized in that, The reverse bias voltage of the diode is greater than or equal to 90V.

19. The battery assembly as claimed in claim 1, characterized in that, The first output busbar includes a first busbar portion disposed on the first battery unit, a first wiring portion extending in a direction away from the first battery unit, and a first connecting portion disposed between the first busbar portion and the first wiring portion, wherein the first connecting portion is stacked on top of the first busbar portion.

20. The battery assembly as claimed in claim 19, characterized in that, The width of the first wiring portion is less than or equal to the width of the first bus portion.

21. The battery assembly as claimed in claim 1, characterized in that, The second output busbar includes a second bus section disposed on the second battery unit, a second wiring section extending in a direction away from the second battery unit, and a second connecting section disposed between the second bus section and the second wiring section, wherein the second connecting section is stacked on top of the second bus section.

22. The battery assembly as claimed in claim 21, characterized in that, The width of the second wiring portion is less than or equal to the width of the second bus portion.

23. The battery assembly as claimed in claim 2, characterized in that, The first end of each battery string in the first battery unit is connected to the first output busbar, and the second end of each battery string in the first battery unit is connected to the first parallel busbar.

24. The battery assembly as claimed in claim 23, characterized in that, The first end of each battery string in the second battery cell is connected to the second output busbar, and the second end of each battery string in the second battery cell is connected to the second parallel busbar.

25. The battery assembly as claimed in claim 24, characterized in that, The first parallel busbar and the second parallel busbar are connected to connect the first battery cell and the second battery cell in series.

26. The battery assembly as claimed in claim 1, characterized in that, The first battery cell is a sliced ​​battery formed by dividing a whole battery cell into three equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into three equal parts.

27. The battery assembly as claimed in claim 1, characterized in that, The first battery cell is a sliced ​​battery formed by dividing a whole battery cell into four equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into four equal parts.

28. The battery assembly as claimed in claim 1, characterized in that, The first battery cell is a sliced ​​battery formed by dividing a whole battery cell into five equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into five equal parts.

29. A photovoltaic system, characterized in that, Includes the battery assembly as described in any one of claims 1-28.

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