Battery assembly and photovoltaic system

Abstract

The application is suitable for the field of photovoltaic technology, and provides a battery assembly and a photovoltaic system. The battery assembly comprises a first battery unit and a second battery unit which are arranged adjacently along a first direction. The first battery unit comprises at least one battery string, and the battery string comprises a plurality of first battery pieces arranged sequentially along a second direction and a plurality of first welding strips arranged on each first battery piece. The second battery unit comprises at least one battery string, and the battery string comprises a plurality of second battery pieces arranged sequentially along the second direction and a plurality of second welding strips arranged on each second battery piece. The plurality of first welding strips and the plurality of second welding strips are arranged symmetrically along a first axis. The application simplifies the path planning of the welding equipment by symmetrically arranging the plurality of first welding strips on the first battery unit and the plurality of second welding strips on the second battery unit, reduces the adjustment time, and improves the production efficiency and yield.

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] Photovoltaic power generation is a technology that directly converts light energy into electrical energy using the photovoltaic effect at semiconductor interfaces. In photovoltaic modules, multiple solar cells are connected in series to form a cell string using solder ribbons. These cell units are then connected in series or parallel by welding the solder ribbons to busbars. However, the process of forming photovoltaic modules often presents several challenges. For example, the solder ribbon distribution between adjacent cell strings may be asymmetrical. Furthermore, the welding positions of the solder ribbons and busbars require differentiated design based on the solder ribbon arrangement on different cell strings, resulting in complex processes and low production efficiency. Utility Model Content

[0003] This application provides a battery assembly designed to address the problems of asymmetrical solder strip distribution between adjacent battery strings, where the solder strip and busbar welding positions need to be designed differently depending on the solder strip arrangement on different battery strings, resulting in complex processes and low production efficiency.

[0004] In a first aspect, this application is implemented as follows: a battery assembly includes: a first battery unit and a second battery unit arranged adjacent to each other along a first direction; the first battery unit includes at least one battery string, the battery string including a plurality of first battery cells arranged sequentially along a second direction 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 including a plurality of second battery cells arranged sequentially along the second direction 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; a first busbar is disposed on the first battery unit, a portion of the first solder strips being connected to the first busbar; a second busbar is disposed on the second battery unit, a portion of the second solder strips being connected to the second busbar; the first busbar and the second busbar are connected, and the first battery unit and the second battery unit form a series connection.

[0005] Optionally, the number of first battery cells in the battery string within the first battery cell is odd, and the first solder strip and the first busbar are electrically connected near the edge of the first battery cell and close to the first axis; the number of second battery cells in the battery string within the second battery cell is odd, and the second solder strip and the second busbar are electrically connected near the edge of the second battery cell and close to the first axis.

[0006] Optionally, the number of first battery cells in the battery string within the first battery cell is even, and the first solder strip and the first busbar adjacent to the edge of the first battery cell and close to the first axis are insulated; the number of second battery cells in the battery string within the second battery cell is even, and the second solder strip and the second busbar adjacent to the edge of the second battery cell and close to the first axis are insulated.

[0007] Optionally, it further includes a first insulating strip extending along the first direction, a portion of which is disposed between the first busbar and the first battery cell, and another portion of which is disposed between the second battery cell and the second busbar.

[0008] Optionally, 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.

[0009] Optionally, each of the battery strings within the first battery cell is a first type of battery string.

[0010] Optionally, the second battery cell also includes a plurality of battery strings arranged in parallel along the first direction, each battery string including a plurality of second battery cells arranged in series along the second direction.

[0011] Optionally, each of the battery strings within the second battery cell is a second type of battery string.

[0012] Optionally, the first battery cell is a sliced ​​battery formed by dividing a whole battery cell into six equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into six equal parts.

[0013] Optionally, the plurality of first solar cells are partially overlapped along the second direction, or the plurality of first solar cells are spaced apart along the second direction.

[0014] Optionally, the plurality of second battery cells are partially overlapped along the second direction, or the plurality of second battery cells are spaced apart along the second direction.

[0015] This application simplifies the path planning of the welding equipment, reduces adjustment time, and improves production efficiency and yield by symmetrically arranging multiple first solder strips on the first battery cell and multiple second solder strips on the second battery cell. For example, the same set of welding parameters can be reused for both the first and second battery cells, and the symmetrical arrangement of the first and second solder strips ensures that the path length and resistance of the current from the first and second battery cells to the busbar are consistent, reducing the risk of local hot spots during current transmission and improving the overall efficiency of the module. In particular, the direct interconnection of the first and second busbars eliminates the need for additional jumper welding steps between battery cells, avoiding the voltage drop problem of traditional jumpers or bridging solder strips, and shortening the production time of automated production lines.

[0016] 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

[0017] Figure 1 This is a structural schematic diagram of the first type of battery assembly provided in the current application;

[0018] Figure 2 yes Figure 1 Enlarged schematic diagram of the structure at point A;

[0019] Figure 3 This is a structural schematic diagram of the second type of battery assembly provided in the current application;

[0020] Figure 4 yes Figure 3 Enlarged schematic diagram of the structure at point B;

[0021] Figure 5 This is a schematic diagram of the circuit structure of the battery assembly provided in the current application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100, First battery unit; 101, First battery cell; 102, First solder strip; 200, Second battery unit; 201, Second battery cell; 202, Second solder strip; 300, First busbar; 400, Second busbar; 500, First insulating strip; 600, First output busbar; 700, Second output busbar; 800, Diode; 900, Junction box; 901, First terminal; 902, Second terminal. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] like Figure 1 As shown in the embodiments of this application, a battery assembly includes a first battery unit 100 and a second battery unit 200 arranged adjacent to each other along a first direction; exemplaryly, the first battery unit 100 and the second battery unit 200 may be spaced apart in the first direction, and the first battery unit 100 and the second battery unit 200 may also be partially overlapped in the first direction, and this application does not limit this.

[0031] The first battery unit 100 includes at least one battery string, which includes a plurality of first battery cells 101 arranged sequentially along a second direction and a plurality of first solder ribbons 102 disposed on each first battery cell 101. The second battery unit 200 includes at least one battery string, which includes a plurality of second battery cells 201 arranged sequentially along a second direction and a plurality of second solder ribbons 202 disposed on each second battery cell 201. It is understood that the first battery cell 101 includes an anisotropic first electrode region and a 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 first battery cell... The current on cell 101 can be conducted by the first solder ribbon 102. Each adjacent first cell 101 is connected by the first solder ribbon 102, and different polarity regions on each adjacent first cell 101 are connected in series to form a battery string. Similarly, the second cell 201 includes a first electrode region and a second electrode region of opposite polarity located on the back of the second 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 cell 201 can be conducted by the second solder ribbon 202, and each adjacent second cell 201 is connected by the second solder ribbon 202, and different polarity regions on each adjacent second cell 201 are connected in series to form a battery string.

[0032] 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; no limitation is made here. When the semiconductor structure absorbs solar energy, 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 normally installed and in use, the side facing upwards is called the front side, and the side opposite the front side is called the back side.

[0033] 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.

[0034] It is also understood that, in the first battery unit 100, each battery string within 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. Similarly, in the second battery unit 200, each battery string within 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.

[0035] like Figure 2As shown, 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 L facilitates the arrangement of solder strips in the battery assembly. 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.

[0036] Furthermore, a first busbar 300 is provided on the first battery cell 100, and a portion of the first solder strip 102 is connected to the first busbar 300. Understandably, exemplarily, the first busbar 300 can be provided on the end battery cell of the first battery cell 100, or the first busbar 300 can be provided on the second battery cell adjacent to the end battery cell of the first battery cell 100. In both cases, the first solder strip 102 and the first busbar 300, which are located in the same polarity region of the end battery cell of the first battery cell 100, are electrically connected to achieve current collection on the first battery cell 100.

[0037] A second busbar 400 is provided on the second battery cell 200, and a portion of the second solder strip 202 is connected to the second busbar 400. Understandably, exemplarily, the second busbar 400 can be provided on the end battery cell of the second battery cell 200, and the first busbar 300 can also be provided on the second battery cell adjacent to the end battery cell of the second battery cell 200. In both cases, the second solder strip 202 and the second busbar 400, which are located in the same polarity region of the end battery cell of the second battery cell 200, are electrically connected to achieve current collection on the second battery cell 200.

[0038] The first busbar 300 and the second busbar 400 are connected, and the first battery cell 100 and the second battery cell 200 are connected in series. For example, the first busbar 300 and the second busbar 400 can be integrally formed, eliminating the welding step between the busbars. Traditional split busbars require welding or mechanical connection, introducing additional contact resistance, while the integrally formed busbar has no connection interface, reducing resistance and directly reducing power loss. In addition, the combination of the integral busbar and symmetrical solder strips ensures that the current path from the battery cell to the busbar is completely symmetrical, avoiding current deviation caused by busbar misalignment in traditional designs.

[0039] like Figure 5As shown, the first battery unit 100 is provided with a first output busbar 600, and a portion of the first solder strip 102 on the first battery unit 100 is connected to the first output busbar 600. Similarly, the second battery unit 200 is provided with a second output busbar 700, and a portion of the second solder strip 202 on the second battery unit 200 is connected to the second output busbar 700. The first output busbar 600 and the second output busbar 700 are respectively connected to the positive and negative terminals of the junction box 900 to enable the current from the first battery unit 100 and the second battery unit 200 to be drawn out to external devices. It should be noted that if the first solder strip 102 connected to the first output busbar 600 is located in the first electrode area, then the second solder strip 202 connected to the second output busbar 700 is located in the second electrode area. Furthermore, a diode 800 is disposed within the junction box 900. The junction box 900 has a first terminal 901 and a second terminal 902. The diode 800 is connected in parallel between the first terminal 901 and the second terminal 902, with opposite polarities. A first output bus 600 is connected to the first terminal 901 of the junction box 900, and a second output bus 700 is connected to the second terminal 902 of the junction box 900. The diode 800 connected in parallel within the junction box 900 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).

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the number of first battery cells 101 in the battery string within the first battery cell 100 is odd. A first solder strip 102 adjacent to the edge of the first battery cell 100 and close to the first axis is electrically connected to a first busbar 300. Through this structural design, the first solder strip 102 at the edge of the first battery cell 100 and the first busbar 300 are electrically connected, allowing current to flow from the edge of the first battery cell 100 to the first busbar 300 via the shortest path, reducing the lateral transmission distance. Similarly, the number of second battery cells 201 in the battery string within the second battery cell 200 is odd. A second solder strip 202 adjacent to the edge of the second battery cell 200 and close to the first axis is electrically connected to a second busbar 400. Through this structural design, the second solder strip 202 at the edge of the second battery cell 200 and the second busbar 400 are electrically connected, allowing current to flow from the edge of the second battery cell 200 to the second busbar 400 via the shortest path, reducing the lateral transmission distance. In addition, the first axis serves as a symmetrical reference to ensure that the impedance of the solder strips of the two battery cells and the connection point of the busbar are consistent, thus avoiding uneven current distribution caused by positional offset.

[0041] like Figure 3 and Figure 4 As shown, in some embodiments, the number of first battery cells 101 in the battery string within the first battery cell 100 is even. The first solder ribbon 102 adjacent to the edge of the first battery cell 100 and close to the first axis L is insulated from the first busbar 300. Understandably, the first solder ribbon 102 adjacent to the edge of the first battery cell 100 and close to the first axis L does not need to be laminated with the first busbar 300, reducing the risk of microcracks occurring during the lamination process in the vulnerable edge areas of the first battery cell 100. Similarly, the number of second battery cells 201 in the battery string within the second battery cell 200 is even. The second solder ribbon 202 adjacent to the edge of the second battery cell 200 and close to the first axis L is insulated from the second busbar 400. Understandably, the second solder ribbon 202 adjacent to the edge of the second battery cell 200 and close to the first axis L does not need to be laminated with the second busbar 400, reducing the risk of microcracks occurring during the lamination process in the vulnerable edge areas of the second battery cell 200.

[0042] The battery assembly also includes a first insulating strip 500 extending along a first direction. A portion of the first insulating strip 500 is disposed between the first busbar 300 and the first battery cell 100, and another portion is disposed between the second battery cell 200 and the second busbar 400. In other words, the first insulating strip 500 is laid as a single, continuous strip between the two battery cells, eliminating the need for segmented alignment and improving production efficiency. Furthermore, the entire insulating strip completely isolates any potential contact points between the busbar and the battery cell, eliminating the risk of partial discharge due to insulation gaps.

[0043] like Figure 5 As shown, in some embodiments, the first battery unit 100 includes multiple battery strings arranged in parallel along a first direction. Each battery string in the first battery unit 100 includes multiple first battery cells 101 arranged in series along a second direction. It is understood that the first battery unit 100 may contain three, four, or five battery strings, and this is not limited. After multiple battery strings are connected in parallel to form the first battery unit, the failure of a single battery string (such as shading or damage) only affects that parallel branch; other parallel strings can still output current normally, reducing power loss and improving system fault tolerance.

[0044] It should be noted that, exemplarily, in the related technology, the back-contact solar cell is divided into two equal parts at the middle dividing line by laser scribing or other methods, thereby forming a first type solar cell and a second type solar cell of equal area. The electrode grid structures of the first type solar cell and the second type solar cell are arranged in a mirror-symmetrical manner. The first type solar cell can be cell A, and the second type solar cell can be cell B, or vice versa.

[0045] Furthermore, each battery string within the first battery unit 100 is a first-type battery unit. That is, all battery strings within the first battery unit 100 are first-type battery strings, connected in parallel. Similarly, all battery strings within the second battery unit 200 are second-type battery strings, also connected in parallel. As described above, it can be understood that the polarity regions of the solder ribbon distribution on the first-type battery strings and the polarity regions of the solder ribbon distribution on the second-type battery strings are arranged in a mirror-symmetrical manner. With this structural arrangement, compared to the traditional alternating arrangement of first-type and second-type battery strings within a battery unit, since each battery string in each battery pack is of the same type, the battery string arrangement within a battery unit does not require flipping individual battery strings. Only one battery unit needs to be flipped once after the battery strings in both battery units have been arranged, avoiding the detachment of battery cells caused by frequent flipping of battery strings.

[0046] like Figure 5 As shown, in some embodiments, the second battery unit 200 includes multiple battery strings arranged in parallel along a first direction. Each battery string in the second battery unit 200 includes multiple second battery cells 201 arranged in series along a second direction. It is understood that the second battery unit 200 may contain three, four, or five battery strings, and this is not limited thereto. After multiple battery strings are connected in parallel to form a second battery unit, the failure of a single battery string (such as shading or damage) only affects that parallel branch; other parallel strings can still output current normally, reducing power loss and improving system fault tolerance.

[0047] The first solar cell 101 is a sliced ​​solar cell formed by dividing a whole solar cell into six equal parts, and / or the second solar cell 201 is a sliced ​​solar cell formed by dividing a whole solar cell into six equal parts. The solar cell (first solar cell 101 or second solar cell 201) is a one-sixth 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.

[0048] In some embodiments, a plurality of first solar cells 101 are partially overlapped along a 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 required 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 overlap of the first solar cells 101 enables the module to accommodate solar cells of more sizes, thereby increasing the module's power output. In other embodiments, a plurality of first solar cells 101 are spaced apart along the second direction. For example, the spacing distance can be 0 mm, 1 mm, 2 mm, or 3 mm, and is not specifically limited here. The spacing between the first solar cells 101 provides buffer space between each first solar cell 101, reducing the risk of solar cell merging.

[0049] Multiple second solar cells 201 are partially overlapped along a 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 are simply overlapped together. This allows for better concealment of the series solder strips, and the overlap of the second solar cells 201 enables the module to accommodate solar cells of more sizes, thereby increasing the module's power output. In other embodiments, multiple second solar cells 201 are spaced apart along the second direction. For example, the spacing distance can be 0 mm, 1 mm, 2 mm, or 3 mm, and is not specifically limited here. The spacing between the second solar cells 201 provides buffer space between each second solar cell 201, reducing the risk of solar cell merging.

[0050] 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.

[0051] 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.

[0052] 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 cell and a second battery cell arranged adjacent to each other along a first direction; The first battery cell includes at least one battery string, the battery string including a plurality of first battery cells arranged sequentially along a second direction and a plurality of first solder strips disposed on each of the first battery cells; The second battery cell includes at least one battery string, the battery string including a plurality of second battery cells arranged sequentially along the second direction 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; A first busbar is disposed on the first battery cell, and a portion of the first solder strip is connected to the first busbar; The second busbar is disposed on the second battery cell, and a portion of the second solder strip is connected to the second busbar; the first busbar and the second busbar are connected, and the first battery cell and the second battery cell form a series connection.

2. The battery assembly as claimed in claim 1, characterized in that, The number of first battery cells in the battery string within the first battery cell is odd, and the first solder strip and the first busbar are electrically connected near the edge of the first battery cell and close to the first axis; the number of second battery cells in the battery string within the second battery cell is odd, and the second solder strip and the second busbar are electrically connected near the edge of the second battery cell and close to the first axis.

3. The battery assembly as described in claim 1, characterized in that, The number of first battery cells in the battery string within the first battery cell is even, and the first solder strip and the first busbar adjacent to the edge of the first battery cell and close to the first axis are insulated; the number of second battery cells in the battery string within the second battery cell is even, and the second solder strip and the second busbar adjacent to the edge of the second battery cell and close to the first axis are insulated.

4. The battery assembly as claimed in claim 1, characterized in that, It also includes a first insulating strip extending along the first direction, a portion of which is disposed between the first busbar and the first battery cell, and another portion of which is disposed between the second battery cell and the second busbar.

5. The battery assembly as claimed in claim 1, characterized in that, 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.

6. The battery assembly as claimed in claim 5, characterized in that, Each of the battery strings within the first battery cell is a first type of battery string.

7. The battery assembly as claimed in claim 1, characterized in that, The second battery unit 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.

8. The battery assembly as claimed in claim 7, characterized in that, Each of the battery strings within the second battery cell is a second type of battery string.

9. 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 six equal parts, and / or the second battery cell is a sliced ​​battery formed by dividing a whole battery cell into six equal parts.

10. The battery assembly as claimed in claim 1, characterized in that, The plurality of first battery cells are partially overlapped along the second direction, or the plurality of first battery cells are spaced apart along the second direction.

11. The battery assembly as claimed in claim 1, characterized in that, The plurality of second battery cells are partially overlapped along the second direction, or the plurality of second battery cells are spaced apart along the second direction.

12. A photovoltaic system, characterized in that, Includes the battery assembly as described in any one of claims 1-11.

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