Battery assembly and photovoltaic system

Abstract

The invention is applicable to 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 sequentially arranged in the first direction, and the first battery unit and the second battery unit are arranged in parallel; each of the first battery unit and the second battery unit comprises a plurality of battery string groups which are sequentially arranged in the second direction and are connected in series, each battery string group comprises two battery strings which are sequentially arranged in the second direction and are connected in parallel, and each battery string comprises a plurality of battery pieces which are sequentially connected in series in the first direction; the bypass module is arranged in reverse parallel with the first battery unit and the second battery unit at the same time, one end of the first battery unit and one end of the second battery unit are connected with the first end of the bypass module, and the other end of the first battery unit and the other end of the second battery unit are connected with the second end of the bypass module. The battery assembly is only provided with one bypass module, so that the production cost of the battery assembly and the assembly process difficulty of the battery assembly can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a battery assembly and a photovoltaic system. Background Art

[0002] Solar cells, also known as photovoltaic cells, are devices that use the photovoltaic effect to directly convert light energy into direct current (DC). In related technologies, multiple solar cells are soldered together and then laminated to form a battery module. The back of the module is encapsulated with back glass or a backsheet and a first adhesive film, while the front of the module is encapsulated with a second adhesive film and front glass.

[0003] In related technologies, a battery assembly typically includes multiple battery strings connected in parallel, with each battery string individually and in reverse parallel with a corresponding bypass diode. When a cell on any battery string within the battery string is blocked or faulty, resulting in a hot spot effect, the bypass diode can form a forward bias, allowing current to bypass the blocked or faulty battery string and flow through the bypass diode without affecting the normal power generation of other battery strings within the battery string. Therefore, since each battery string is typically individually provided with a bypass diode, the battery assembly has a large number of bypass diodes, resulting in a high production cost for the battery assembly. Furthermore, the large number of bypass diodes complicates the assembly process of the battery assembly, affecting the assembly efficiency of the battery assembly. Summary of the Invention

[0004] The present invention provides a battery assembly, aiming to solve the problem that the battery assembly in the prior art has a large number of bypass diodes, resulting in high production costs and complex assembly processes.

[0005] The present invention is implemented by providing a battery assembly comprising:

[0006] a first battery cell and a second battery cell arranged sequentially along a first direction, the first battery cell and the second battery cell being arranged in parallel, the first battery cell and the second battery cell each comprising a plurality of battery string groups sequentially arranged and connected in series along a second direction, each of the battery string groups comprising two battery strings sequentially arranged and connected in parallel along the second direction, the battery string comprising a plurality of battery cells sequentially connected in series along the first direction, the second direction intersecting the first direction; and

[0007] A bypass module is arranged in reverse parallel with the first battery unit and the second battery unit at the same time, one end of the first battery unit and the second battery unit is connected to the first end of the bypass module, and the other end of the first battery unit and the second battery unit is connected to the second end of the bypass module, one of the first end of the bypass module and the second end of the bypass module is the input end of the bypass module, and the other is the output end of the bypass module.

[0008] Preferably, the battery cell is one of a third battery cell cut or split from a whole battery cell, a quarter battery cell cut or split from a whole battery cell, a fifth battery cell cut or split from a whole battery cell, and a sixth battery cell cut or split from a whole battery cell.

[0009] Preferably, the first battery unit includes a first battery string group, a second battery string group, and a third battery string group connected in series in sequence along the second direction; the second battery unit includes a fourth battery string group, a fifth battery string group, and a sixth battery string group connected in series in sequence along the second direction;

[0010] The first battery string group and the fourth battery string group are sequentially arranged along the first direction and connected in parallel, the second battery string group and the fifth battery string group are sequentially arranged along the first direction and connected in parallel, and the third battery string group and the sixth battery string group are arranged along the first direction and connected in parallel.

[0011] Preferably, it also includes:

[0012] a first bus bar, wherein the two battery strings of the first battery string group are connected in parallel via the first bus bar, the two battery strings of the second battery string group are connected in parallel via the first bus bar, and the first battery string group and the second battery string group are connected in series via the first bus bar;

[0013] The two battery strings of the fourth battery string group are connected in parallel through the second bus bar, the two battery strings of the fifth battery string group are connected in parallel through the second bus bar, and the fourth battery string group and the fifth battery string group are connected in series through the second bus bar.

[0014] Preferably, it also includes:

[0015] A third bus bar, through which the two battery strings of the first battery string group and the two battery strings of the fourth battery string group are connected in parallel, and the third bus bar is connected to the first end of the bypass module.

[0016] Preferably, it also includes:

[0017] a fourth bus bar, through which the two battery strings of the third battery string group are connected in parallel;

[0018] A fifth bus bar, through which the two battery strings of the sixth battery string group are connected in parallel.

[0019] Preferably, it also includes:

[0020] A sixth bus bar is provided, through which the two battery strings of the second battery string group and the two battery strings of the fifth battery string group are connected in parallel, and the sixth bus bar connects the second battery string group and the third battery string group in series, and connects the fifth battery string group and the sixth battery string group in series.

[0021] Preferably, it also includes:

[0022] A seventh bus bar, through which the two battery strings of the third battery string group and the two battery strings of the sixth battery string group are connected in parallel, and the seventh bus bar is connected to the second end of the bypass module.

[0023] Preferably, it also includes:

[0024] The sixth bus bar is connected to the lead, the second battery string group and the third battery string group are connected in series through the sixth bus bar and the lead, and the fifth battery string group and the sixth battery string group are connected in series through the sixth bus bar and the lead.

[0025] Preferably, the bypass module is located between the third bus bar and the seventh bus bar, and the third bus bar and the seventh bus bar are linearly arranged along the second direction.

[0026] Preferably, the sixth bus bar is arranged on the seventh bus bar, the sixth bus bar and the seventh bus bar at least partially overlap, and an insulating strip is provided between the seventh bus bar and the sixth bus bar.

[0027] Preferably, a gap is provided between the battery string group of the first battery unit and the battery string group of the second battery unit, and the third bus bar, the sixth bus bar and the seventh bus bar are all located in the gap position between the battery string group of the first battery unit and the battery string group of the second battery unit.

[0028] Preferably, the sixth bus bar and the seventh bus bar are staggered in the first direction, and there is no overlapping area between the sixth bus bar and the seventh bus bar.

[0029] Preferably, the offset distance between the sixth bus bar and the seventh bus bar in the first direction is greater than 1 mm.

[0030] Preferably, there is no gap between the battery string of the first battery cell and the battery string of the second battery cell, the third bus bar, the sixth bus bar and the seventh bus bar are all located on the back of the battery cell of the first battery cell or the second battery cell, and insulating strips are provided between the third bus bar, the sixth bus bar and the seventh bus bar and the back of the battery cell.

[0031] Preferably, the first bus bar is located outside one end of the first battery string group and the second battery string group away from the second battery unit, and the second bus bar is located outside one end of the fourth battery string group and the fifth battery string group away from the first battery unit.

[0032] Preferably, the fourth bus bar is located outside an end of the third battery string group away from the second battery unit, and the fifth bus bar is located outside an end of the sixth battery string group away from the first battery unit.

[0033] Preferably, the first bus bar is located on the back side of the battery cell at one end of the first battery string group and the second battery string group away from the second battery unit; the second bus bar is located on the back side of the battery cell at one end of the fourth battery string group and the fifth battery string group away from the first battery unit, and insulating strips are provided between the first bus bar and the battery cell and between the second bus bar and the battery cell.

[0034] Preferably, the fourth bus bar is located on the back of the battery cell at one end of the third battery string group away from the second battery unit, the fifth bus bar is located on the back of the battery cell at one end of the sixth battery string group away from the first battery unit, and insulating strips are provided between the fourth bus bar and the battery cell and between the fifth bus bar and the battery cell.

[0035] Preferably, the sixth bus bar and the seventh bus bar are both located on the back side of the battery cell of the first battery unit or the second battery unit.

[0036] Preferably, the seventh bus bar is located on the back of the second battery string group and the third battery string group, and the sixth bus bar is located on the back of the fifth battery string group.

[0037] Preferably, the lead is located in a gap between the second battery string group and the third battery string group and in a gap between the fifth battery string group and the sixth battery string group.

[0038] Preferably, the width of the gap between the second battery string group and the third battery string group is greater than the width of the gap between the first battery string group and the second battery string group, and the width of the gap between the fifth battery string group and the sixth battery string group is greater than the width of the gap between the fourth battery string group and the fifth battery string group.

[0039] Preferably, the lead is located on the back side of the battery cell of the second battery string group and / or the third battery string group, and the lead is located on the back side of the battery cell of the fifth battery string group and / or the sixth battery string group, and an insulating strip is provided between the lead and the battery cell.

[0040] Preferably, gaps are provided between adjacent battery cells in each battery string.

[0041] Preferably, adjacent battery cells in each battery string partially overlap.

[0042] Preferably, gaps are provided between adjacent battery strings along the second direction, and the width of the gaps between adjacent battery strings is 0.4 to 4 mm.

[0043] Preferably, it also includes:

[0044] A junction box, wherein the bypass module is encapsulated in the junction box.

[0045] Preferably, the bypass module is a single bypass diode, one end of the first battery unit and the second battery unit is simultaneously connected to the first end of the bypass diode, and the other end of the first battery unit and the second battery unit is simultaneously connected to the second end of the bypass diode.

[0046] Preferably, the reverse bias voltage of the bypass diode is greater than or equal to 90V.

[0047] Preferably, the third bus bar and the seventh bus bar are sequentially arranged along the second direction, the dimension of the third bus bar along the second direction is L1, the dimension of each battery cell along the second direction is d, and 1.5d<L1≤4d.

[0048] The present invention also provides a photovoltaic system comprising the above-mentioned battery assembly.

[0049] A battery assembly provided by the present invention includes a first battery cell and a second battery cell arranged sequentially along a first direction, the first battery cell and the second battery cell each including a plurality of battery string groups sequentially connected in series along a second direction, each battery string group including two battery strings sequentially arranged and connected in parallel along the second direction, the battery string including a plurality of battery cells sequentially connected in series along the first direction, the plurality of battery string groups of the first battery cell and the plurality of battery string groups of the second battery cell being arranged in parallel, the entire battery assembly only needs to be provided with one bypass module, the bypass module is simultaneously arranged in reverse parallel with the first battery cell and the second battery cell, one end of the first battery cell and the second battery cell is connected to the first end of the bypass module, the other end of the first battery cell and the second battery cell is connected to the second end of the bypass module, the first end of the bypass module and the second end of the bypass module are either input ends or output ends of the bypass module;

[0050] When any cell in the battery string of the first battery unit is blocked or fails to produce a hot spot effect, the bypass module can form a forward bias, so that the current bypasses the blocked or faulty battery string and flows through the bypass module without affecting the normal power generation of the second battery unit; when any cell in the battery string of the second battery unit is blocked or fails to produce a hot spot effect, the bypass module can form a forward bias, so that the current bypasses the blocked or faulty battery string and flows through the bypass module without affecting the normal power generation of the first battery unit. Since the battery assembly of the present invention only needs to be provided with one bypass module, the first battery unit and the second battery unit do not need to be separately provided with bypass modules in parallel. The first battery unit and the second battery unit share one bypass module, which can greatly reduce the number of bypass modules of the battery assembly, thereby reducing the production cost of the battery assembly; moreover, since only one bypass module is required, only one junction box is required to package the bypass module, thereby reducing the number of junction boxes, reducing the workload of the junction box wiring operation, reducing the difficulty of the battery assembly process, and thus improving the assembly efficiency of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A circuit diagram of a battery assembly provided by an embodiment of the present invention;

[0052] Figure 2 A schematic plan view of a battery assembly provided by an embodiment of the present invention;

[0053] Figure 3 A schematic plan view of another battery assembly provided by an embodiment of the present invention;

[0054] Figure 4 for Figure 2 A magnified schematic diagram of part A in the figure. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0056] In the description of the present invention, it should be understood that the terms "upper", "lower", "back", "front", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0057] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use scenarios of other materials.

[0059] Please refer to Figure 1-Figure 2 , an embodiment of the present invention provides a battery assembly, comprising:

[0060] A first battery cell 1 and a second battery cell 2 are sequentially arranged along a first direction Y, the first battery cell 1 and the second battery cell 2 are arranged in parallel, the first battery cell 1 and the second battery cell 2 each include a plurality of battery string groups 10 sequentially arranged and connected in series along a second direction X, each battery string group 10 includes two battery strings 100 sequentially arranged and connected in parallel along the second direction X, the battery string 100 includes a plurality of battery cells 111 sequentially connected in series along the first direction Y, and the second direction X intersects the first direction Y; and

[0061] A bypass module 3 is arranged in reverse parallel with the first battery unit 1 and the second battery unit 2. One end of the first battery unit 1 and the second battery unit 2 is connected to the first end of the bypass module 3, and the other end of the first battery unit 1 and the second battery unit 2 is connected to the second end of the bypass module 3. One of the first end of the bypass module 3 and the second end of the bypass module 3 is the input end of the bypass module 3, and the other is the output end of the bypass module 3.

[0062] The battery assembly provided by the embodiment of the present invention includes a first battery cell 1 and a second battery cell 2, and the first battery cell 1 and the second battery cell 2 each include a plurality of battery string groups 10 arranged in sequence along the second direction X. Optionally, the first battery cell 1 and the second battery cell 2 each include three battery string groups 10. Each battery string group 10 includes two battery strings 100 arranged in sequence along the second direction X, and the two battery strings 100 in each battery string group 10 are arranged in parallel, and each battery string 100 includes a plurality of battery cells 111. The plurality of battery cells 111 of each battery string 100 are arranged in sequence along the first direction Y, and the plurality of battery cells 111 of each battery string 100 are connected in series in sequence. Optionally, the plurality of battery cells 111 of each battery string 100 are connected in series through welding strips. The number of battery cells 111 included in each battery string 100 is not limited, Figure 1-Figure 3 The figure only illustrates that each battery string 100 includes 13 battery cells 111, but the number of battery cells 111 included in each battery string 100 is not limited to 13. For example, the number of battery cells 111 included in each battery string 100 may also be 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 23, 25, or 26. Preferably, the number of battery cells 111 included in each battery string 100 is 5 to 26.

[0063] In the embodiment of the present invention, the cell 111 can specifically be a back-contact solar cell. Preferably, the cell 111 can be a back-contact solar cell with anti-hot spot function in the prior art, thereby reducing the reverse breakdown voltage when the cell 111 is blocked. By utilizing the anti-hot spot performance of the cell 111 itself, while reducing the number of bypass modules 3 to reduce costs, the risk of hot spots in the battery module can also be reduced.

[0064] In the embodiment of the present invention, the second direction X intersects the first direction Y. The first direction Y is the direction in which the battery cells 111 in each battery string 100 are connected in series. The second direction X is preferably perpendicular to the first direction Y. Specifically, the first direction Y and the second direction X may be the longitudinal direction and the transverse direction of the battery assembly, respectively. Of course, in some possible embodiments, the second direction X may not be perpendicular to the first direction Y, and this is not a limitation here.

[0065] In an embodiment of the present invention, a battery assembly is provided, including a first battery cell 1 and a second battery cell 2 arranged in sequence along a first direction Y. The first battery cell 1 and the second battery cell 2 both include a plurality of battery string groups 10 connected in series in a second direction X. Each battery string group 10 includes two battery strings 100 arranged in sequence and connected in parallel along the second direction X. The battery string 100 includes a plurality of battery cells 111 connected in series in the first direction Y. The plurality of battery string groups 10 of the first battery cell 1 and the plurality of battery string groups 10 of the second battery cell 2 are arranged in parallel. The entire battery assembly only needs to be provided with one bypass module 3. The bypass module 3 is simultaneously arranged in reverse parallel with the first battery cell 1 and the second battery cell 2. One end of the first battery cell 1 and the second battery cell 2 is connected to the first end of the bypass module 3. The first battery cell The other end of element 1 and the second battery unit 2 is connected to the second end of the bypass module 3, and the first end of the bypass module 3 and the second end of the bypass module 3 are one of the input end and the other end of the bypass module 3; when any battery cell 111 in the battery string group 10 of the first battery unit 1 is blocked or fails to cause a hot spot effect, the bypass module 3 can form a forward bias to allow the current to bypass the blocked or faulty battery string 100 and flow through the bypass module 3 without affecting the normal power generation of the second battery unit 2; when any battery cell 111 in the battery string group 10 of the second battery unit 2 is blocked or fails to cause a hot spot effect, the bypass module 3 can form a forward bias to allow the current to bypass the blocked or faulty battery string 100 and flow through the bypass module 3 without affecting the normal power generation of the first battery unit 1. Since the battery assembly of the present invention only needs to be equipped with one bypass module 3, the first battery unit 1 and the second battery unit 2 do not need to be separately connected in parallel with the bypass module 3. The first battery unit 1 and the second battery unit 2 share one bypass module 3, which can greatly reduce the number of bypass modules 3 of the battery assembly, thereby reducing the production cost of the battery assembly; moreover, since only one bypass module 3 is required, only one junction box 4 is required to encapsulate the bypass module 3, and thus the number of junction boxes 4 can also be reduced, which can reduce the workload of the junction box 4 wiring operation, reduce the difficulty of the battery assembly process, and thus improve the assembly efficiency of the battery assembly.

[0066] As an embodiment of the present invention, the bypass module 3 is a single bypass diode, one end of the first battery unit 1 and the second battery unit 2 are simultaneously connected to the first end of the bypass diode, and the other end of the first battery unit 1 and the second battery unit 2 are simultaneously connected to the second end of the bypass diode.

[0067] In this embodiment, the bypass module 3 is a bypass diode. The bypass diode specifically plays a bypass role. When any cell 111 in the battery string 100 of the first battery unit 1 is blocked or fails to cause a hot spot effect, the bypass diode can form a forward bias, allowing the current to bypass the blocked or faulty battery string 100 and flow through the bypass diode without affecting the normal power generation of the second battery unit 2; when any cell 111 in the battery string 100 of the second battery unit 2 is blocked or fails to cause a hot spot effect, the bypass diode can form a forward bias, allowing the current to bypass the blocked or faulty battery string 100 and flow through the bypass diode without affecting the normal power generation of the first battery unit 1.

[0068] As an embodiment of the present invention, the reverse bias voltage of the bypass diode is greater than or equal to 90V.

[0069] In this embodiment, the reverse bias voltage of the bypass diode is the voltage applied across the bypass diode when it is in a reverse biased state, i.e., the reverse withstand voltage of the bypass diode. Bypass module 3 uses a bypass diode with a reverse bias voltage greater than or equal to 90V to ensure that the reverse withstand voltage of the bypass diode is higher than the maximum reverse bias voltage that can be generated by the battery module, thereby preventing the bypass diode from breaking down and ensuring reliable operation of the module.

[0070] As an embodiment of the present invention, it also includes:

[0071] Junction box 4 , the bypass module 3 is encapsulated in the junction box 4 .

[0072] In this embodiment, the bypass module 3 is encapsulated in the junction box 4. The junction box 4 is used to protect the bypass module 3 and facilitate the circuit connection between the bypass module 3 and the first battery cell 1 and the second battery cell 2. One end of the first battery cell 1 and the second battery cell 2 is connected to a terminal of the junction box 4 to connect one end of the first battery cell 1 and the second battery cell 2 to the input end of the bypass diode, and the other end of the first battery cell 1 and the second battery cell 2 is connected to another terminal of the junction box 4 to connect the other end of the first battery cell 1 and the second battery cell 2 to the output end of the bypass diode. Since the battery assembly of the present invention only needs to be provided with one bypass module 3, the entire battery assembly also only needs one junction box 4, which also reduces the number of junction boxes 4, can further reduce the cost of the battery assembly, and can reduce the wiring operation of the junction box 4, can simplify the difficulty of battery assembly assembly, and improve the assembly efficiency of the battery assembly.

[0073] In some other embodiments, the bypass module 3 may also include two bypass diodes arranged in parallel, one end of the first battery unit 1 and the second battery unit 2 is simultaneously connected to the input end of the two bypass diodes of the bypass module 3, and the other end of the first battery unit 1 and the second battery unit 2 is simultaneously connected to the output end of the two bypass diodes of the bypass module 3.

[0074] In this embodiment, the first battery cell 1 and the second battery cell 2 share a bypass module 3, which can reduce the number of bypass modules 3 designed. The bypass module 3 includes two bypass diodes arranged in parallel. The two bypass diodes can play an effective shunting role. When the number of battery cells 111 is large and / or the size is large, the current requirement for the bypass diode can be reduced, so that the heat generated by the bypass diode is relatively small, thereby reducing the risk of bypass diode failure and eliminating the need for a high-current bypass diode. The first battery cell 1 and the second battery cell 2 share a bypass module 3, thereby reducing the cost of the entire photovoltaic module. In addition, when one bypass diode in the bypass module 3 is damaged, the other bypass diode in the bypass module 3 can still effectively protect all battery cells 111 of the corresponding battery cell, thereby effectively improving the reliability of the photovoltaic module.

[0075] As an embodiment of the present invention, the battery cell 111 is one of a third battery cell 111 cut from a whole battery cell, a quarter battery cell 111 cut from a whole battery cell, a fifth battery cell 111 cut from a whole battery cell, and a sixth battery cell 111 cut from a whole battery cell.

[0076] In this embodiment, the battery cell 111 in the battery assembly is set to be one of a third battery cell 111 cut from a whole battery cell, a quarter battery cell 111 cut from a whole battery cell, a fifth battery cell 111 cut from a whole battery cell, and a sixth battery cell 111 cut from a whole battery cell. Compared with a battery assembly with half a battery cell, the area of ​​the battery cell 111 in the battery assembly can be reduced, so that the power generation current of a single battery cell 111 is reduced, and the internal power loss of the single battery cell 111 can be reduced, thereby reducing the overall power loss of the battery assembly, thereby improving the output power of the battery assembly.

[0077] Among them, the first size of one-third of the battery cell 111 is the same as the first size of the whole battery cell, and the ratio of the second size of the one-third of the battery cell 111 to the second size of the whole battery cell is 1:3; the first size of the one-quarter of the battery cell 111 is the same as the first size of the whole battery cell, and the ratio of the second size of the one-quarter of the battery cell 111 to the second size of the whole battery cell is 1:4; the first size of the one-fifth of the battery cell 111 is the same as the first size of the whole battery cell, and the ratio of the second size of the one-fifth of the battery cell 111 to the second size of the whole battery cell is 1:5; the first size of the one-sixth of the battery cell 111 is the same as the first size of the whole battery cell, and the ratio of the second size of the one-sixth of the battery cell 111 to the second size of the whole battery cell is 1:6. Preferably, the battery cell 111 in the battery assembly is a quarter battery cell 111 cut from a whole battery cell, which can ensure that the total open circuit voltage and short circuit current of the assembly remain unchanged, reduce the transmission current of the battery string 100, thereby reducing the electrical loss of the battery string 100, and further reduce the power loss of the photovoltaic assembly. Among them, Figures 1-4 The diagram only illustrates the case where the cell 111 is a quarter cell cut from a whole cell.

[0078] In the embodiment of the present invention, adjacent battery cells 111 in the battery string 100 may be provided with gaps or without gaps.

[0079] like Figure 2 As shown, as an embodiment of the present invention, gaps are provided between adjacent battery cells 111 in each battery string 100 .

[0080] In this embodiment, adjacent cells 111 of the battery string 100 have a certain spacing between cells to avoid mutual shading between adjacent cells 111, thereby improving the photovoltaic conversion efficiency of the battery assembly. Preferably, the spacing D between adjacent cells 111 in each battery string 100 is 0.1 to 5 mm. For example, the spacing D between adjacent cells 111 in the battery string 100 can be any value among 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 4.5 mm, and 5 mm. In this way, controlling the spacing D between adjacent cells 111 in each battery string 100 to be 0.1 to 5 mm can ensure that adjacent cells 111 in the battery string 100 have a certain spacing between cells, and avoid excessive spacing between adjacent cells 111 in the first direction Y, thereby achieving good photovoltaic conversion efficiency of the battery assembly.

[0081] like Figure 3 As shown, as another embodiment of the present invention, adjacent battery cells 111 in each battery string 100 partially overlap.

[0082] In this embodiment, adjacent cells 111 in a battery string 100 have no inter-cell spacing. Adjacent cells 111 within each battery string 100 have an overlapping area, which can increase the cell 111 area ratio on the front of the battery module and improve module power generation efficiency. Optionally, adjacent cells 111 in a battery string 100 overlap to form an overlapping area, with the projected length of the overlapping area in the first direction Y ranging from 0.1 to 1.5 mm. By controlling the projected length of the overlapping area of ​​adjacent cells 111 in the first direction Y to be 0.1 to 0.5 mm, the overlapping area of ​​adjacent cells 111 can be prevented from being too large or too small. This ensures that there are no gaps between adjacent cells 111 in the battery string 100, reduces the area of ​​the front of the battery module that is not the cell 111, and increases the cell 111 area ratio on the front of the battery module, thereby improving module power generation efficiency. Furthermore, the overlapping area of ​​adjacent cells 111 can be prevented from being too large, ensuring a good power generation efficiency for each cell 111.

[0083] As one embodiment of the present invention, gaps may be provided or not provided between adjacent battery strings 100, and gaps may be provided or not provided between adjacent battery cells 111 within a battery string 100. Alternatively, gaps may be provided or not provided between adjacent battery strings 100 along a first direction Y; gaps may be provided or not provided between adjacent battery strings 100 along a second direction X; or gaps may be provided between adjacent battery strings 100 along the first direction Y, while no gaps may be provided between adjacent battery strings 100 along the second direction X.

[0084] like Figure 2 As shown, as an embodiment of the present invention, gaps are provided between adjacent battery strings 100 along the first direction Y, and gaps are also provided between adjacent battery strings 100 along the second direction X. This facilitates the arrangement of the busbars of the battery assembly and avoids the problem of hidden cracks in the battery cells 111 during the lamination process caused by the busbars of the battery assembly being arranged on the back of the battery string 100.

[0085] As an embodiment of the present invention, gaps are provided between adjacent battery strings 100 along the second direction X, and the width of the gaps between adjacent battery strings 100 along the second direction X is 0.4-4 mm.

[0086] In this embodiment, gaps are provided between adjacent battery strings 100 along the second direction X, that is, there are string gaps between adjacent battery strings 100 along the second direction X, and the width of the string gaps is controlled to be 0.4 to 4 mm to avoid the string gaps being too large or too small. This can prevent the gaps from being too large and affecting the power generation efficiency of the battery assembly, and can also prevent the problem of hidden cracks in the battery cells 111 caused by too small string gaps during the lamination process.

[0087] like Figure 3 As shown in FIG. 1 , as another embodiment of the present invention, there is no gap between adjacent battery strings 100 along the first direction Y, no gap between adjacent battery strings 100 along the second direction X, and no gap between adjacent battery cells 111. In this case, the busbars of the battery assembly are arranged on the back of the battery string 100, which can hide the busbars, improve the aesthetics of the front of the battery assembly, and greatly reduce the area occupied by the battery cells 111 on the front of the battery assembly, thereby improving the power generation efficiency of the assembly.

[0088] Please refer to Figure 1-Figure 3 As an embodiment of the present invention, the first battery unit 1 includes a first battery string group 101, a second battery string group 102, and a third battery string group 103 connected in series in a second direction X; the second battery unit 2 includes a fourth battery string group 104, a fifth battery string group 105, and a sixth battery string group 106 connected in series in a second direction X;

[0089] The first battery string group 101 and the fourth battery string group 104 are sequentially arranged along the first direction Y and connected in parallel, the second battery string group 102 and the fifth battery string group 105 are sequentially arranged along the first direction Y and connected in parallel, and the third battery string group 103 and the sixth battery string group 106 are arranged along the first direction Y and connected in parallel.

[0090] In this embodiment, the first battery cell 101, the second battery cell 102, and the third battery cell 103 are sequentially connected in series. The fourth battery cell 104, the fifth battery cell 105, and the sixth battery cell 106 of the second battery cell 2 are arranged such that the first battery cell 101 and the fourth battery cell 104 are arranged opposite to each other along the first direction Y, and the first battery cell 101 and the fourth battery cell 104 are arranged in parallel; the second battery cell 102 and the fifth battery cell 105 are arranged opposite to each other along the first direction Y, and the second battery cell 102 and the fifth battery cell 105 are arranged in parallel; the third battery cell 103 and the sixth battery cell 106 are arranged opposite to each other along the first direction Y, and the third battery cell 103 and the sixth battery cell 106 are arranged in parallel.

[0091] In this embodiment, the first battery string group 101, the second battery string group 102, and the third battery string group 103 of the first battery unit 1 are sequentially connected in series and then connected in parallel with the bypass module 3. The fourth battery string group 104, the fifth battery string group 105, and the sixth battery string group 106 of the second battery unit 2 are sequentially connected in series and then connected in parallel with the bypass module 3. When any cell 111 in the first battery string group 101, the second battery string group 102, and the third battery string group 103 of the first battery unit 1 is blocked or fails, resulting in a hot spot effect, the bypass module 3 can form a forward bias, allowing the current to bypass the blocked or failed battery string 100 and flow through the bypass module 3 without affecting the normal power generation of the second battery unit 2; when any cell 111 in the fourth battery string group 104, the fifth battery string group 105, and the sixth battery string group 106 of the second battery unit 2 is blocked or fails, resulting in a hot spot effect, the bypass module 3 can form a forward bias, allowing the current to bypass the blocked or failed battery string 100 and flow through the bypass module 3 without affecting the normal power generation of the first battery unit 1. Since the first battery string group 101, the second battery string group 102 and the third battery string group 103 of the first battery cell 1 of the battery assembly of the present invention and the fourth battery string group 104, the fifth battery string group 105 and the sixth battery string group 106 of the second battery cell 2 are connected in parallel with a bypass module 3, compared with the traditional method of setting a bypass module 3 in parallel for each battery string group, the number of bypass modules 3 of the battery assembly can be greatly reduced, thereby reducing the production cost of the battery assembly, and reducing the number of junction boxes 4, reducing the difficulty of the battery assembly process, thereby improving the assembly efficiency of the battery assembly.

[0092] As an embodiment of the present invention, it also includes:

[0093] The first bus bar 51, the two battery strings 100 of the first battery string group 101 are connected in parallel through the first bus bar 51, the two battery strings 100 of the second battery string group 102 are connected in parallel through the first bus bar 51, and the first battery string group 101 and the second battery string group 102 are connected in series through the first bus bar 51;

[0094] The second bus bar 52 , the two battery strings 100 of the fourth battery string group 104 are connected in parallel via the second bus bar 52 , the two battery strings 100 of the fifth battery string group 105 are connected in parallel via the second bus bar 52 , and the fourth battery string group 104 and the fifth battery string group 105 are connected in series via the second bus bar 52 .

[0095] In this embodiment, one end of the two battery strings 100 of the first battery string group 101 is connected to the first bus bar 51 through a welding strip, so that the two battery strings 100 of the first battery string group 101 are connected in parallel; one end of the two battery strings 100 of the second battery string group 102 is connected to the first bus bar 51 through a welding strip, so that the two battery strings 100 of the second battery string group 102 are connected in parallel, and the polarity of the two battery strings 100 of the first battery string group 101 connected to the first bus bar 51 is opposite to the polarity of the two battery strings 100 of the second battery string group 102 connected to the first bus bar 51.

[0096] Furthermore, the first bus bar 51 extends from the first battery string group 101 to the second battery string group 102 along the second direction X to connect the first battery string group 101 and the second battery string group 102 in series. The first bus bar 51 is used to connect the two battery strings 100 of the first battery string group 101 in parallel and the two battery strings 100 of the second battery string group 102 in parallel, and the first bus bar 51 is used to connect the first battery string group 101 and the second battery string group 102 in series. Compared to the method of connecting the two battery strings 100 of the first battery string group 101 in parallel, the two battery strings 100 of the second battery string group 102 in parallel, and the first battery string group 101 and the second battery string group 102 in series, each using separate bus bars, the number of bus bars designed can be reduced, the cost can be reduced, and the assembly process of the battery module can be simplified.

[0097] In this embodiment, one end of the two battery strings 100 of the fourth battery string group 104 is connected to the second bus bar 52 via a welding ribbon, thereby connecting the two battery strings 100 of the fourth battery string group 104 in parallel. One end of the two battery strings 100 of the fifth battery string group 105 is connected to the second bus bar 52 via a welding ribbon, thereby connecting the two battery strings 100 of the fifth battery string group 105 in parallel. The polarity of the connection between the two battery strings 100 of the fourth battery string group 104 and the second bus bar 52 is opposite to the polarity of the connection between the two battery strings 100 of the fifth battery string group 105 and the second bus bar 52. Furthermore, the second bus bar 52 extends from the fourth battery string group 104 to the fifth battery string group 105 along the second direction X, thereby connecting the fourth battery string group 104 and the fifth battery string group 105 in series. The second bus bar 52 is used to connect the two battery strings 100 of the fourth battery string group 104 and the two battery strings 100 of the fifth battery string group 105 in parallel, and the second bus bar 52 is used to connect the fourth battery string group 104 and the fifth battery string group 105 in series. Compared with the two battery strings 100 of the fourth battery string group 104 and the two battery strings 100 of the fifth battery string group 105 connected in parallel, and the fourth battery string group 104 and the fifth battery string group 105 connected in series, the number of bus bars designed can be reduced, the cost can be reduced, and the assembly process of the battery module can be simplified.

[0098] As an embodiment of the present invention, it also includes:

[0099] The two battery strings 100 of the first battery string group 101 and the two battery strings 100 of the fourth battery string group 104 are connected in parallel via the third bus bar 53 , and the third bus bar 53 is connected to the first end of the bypass module 3 .

[0100] In this embodiment, the other ends of the two battery strings 100 of the first battery string group 101 are respectively connected to the third bus bar 53 via welding ribbons, and the other ends of the two battery strings 100 of the fourth battery string group 104 are connected to the third bus bar 53 via welding ribbons. The polarity of the connection between the two battery strings 100 of the first battery string group 101 and the third bus bar 53 is the same as the polarity of the connection between the two battery strings 100 of the fourth battery string group 104 and the third bus bar 53. For example, the negative electrodes of the two battery strings 100 of the first battery string group 101 are connected to the first bus bar 51, the positive electrodes of the two battery strings 100 of the second battery string group 102 are connected to the first bus bar 51, the positive electrodes of the two battery strings 100 of the first battery string group 101 are connected to the third bus bar 53, the negative electrodes of the two battery strings 100 of the fourth battery string group 104 are connected to the second bus bar 52, and the positive electrodes of the two battery strings 100 of the fourth battery string group 104 are connected to the third bus bar 53.

[0101] One end of the third bus bar 53 is connected to the first end of the bypass module 3, which may be the output end of the bypass module 3. One end of the third bus bar 53 is connected to the terminal of the junction box 4, thereby achieving electrical connection between the third bus bar 53 and the first end of the bypass module 3.

[0102] As an embodiment of the present invention, it also includes:

[0103] The fourth bus bar 54 , the two battery strings 100 of the third battery string group 103 are connected in parallel via the fourth bus bar 54 ;

[0104] Fifth bus bar 55 , the two battery strings 100 of the sixth battery string group 106 are connected in parallel via the fifth bus bar 55 .

[0105] In this embodiment, one end of the two battery strings 100 of the third battery string group 103 is respectively connected to the fourth bus bar 54 via a welding ribbon, and the polarity of the two battery strings 100 of the third battery string group 103 connected to the fourth bus bar 54 is the same. One end of the two battery strings 100 of the sixth battery string group 106 is respectively connected to the fifth bus bar 55 via a welding ribbon, and the polarity of the two battery strings 100 of the sixth battery string group 106 connected to the fifth bus bar 55 is the same. For example, the positive electrodes of the two battery strings 100 of the third battery string group 103 are connected to the fourth bus bar 54, and the positive electrodes of the two battery strings 100 of the sixth battery string group 106 are connected to the fifth bus bar 55.

[0106] As an embodiment of the present invention, it also includes:

[0107] The second battery string group 102 and the second battery string group 100 and the fifth battery string group 105 are connected in parallel via the sixth bus bar 56 . The sixth bus bar 56 connects the second battery string group 102 and the third battery string group 103 in series, and the fifth battery string group 105 and the sixth battery string group 106 in series.

[0108] In this embodiment, the sixth bus bar 56 can be electrically connected to both the fourth bus bar 54 and the fifth bus bar 55 via a lead 58, thereby connecting the second battery string group 102 and the third battery string group 103 in series, and the fifth battery string group 105 and the sixth battery string group 106 in series. Alternatively, the sixth bus bar 56 can be electrically connected to both the fourth bus bar 54 and the fifth bus bar 55 via a wire. One end of each of the two battery strings 100 in the second battery string group 102 is connected to the sixth bus bar 56 via a welding ribbon, and one end of each of the two battery strings 100 in the fifth battery string group 105 is connected to the sixth bus bar 56 via a welding ribbon. The polarity of the two battery strings 100 in the second battery string group 102 connected to the sixth bus bar 56 is the same as the polarity of the two battery strings 100 in the fifth battery string group 105 connected to the sixth bus bar 56, thereby connecting the second battery string group 102 and the fifth battery string group 105 in parallel. For example, the negative electrodes of the two battery strings 100 of the second battery string group 102 are connected to the sixth bus bar 56 , and the negative electrodes of the two battery strings 100 of the fifth battery string group 105 are connected to the sixth bus bar 56 .

[0109] As an embodiment of the present invention, it also includes:

[0110] The two battery strings 100 of the third battery string group 103 and the two battery strings 100 of the sixth battery string group 106 are connected in parallel via the seventh bus bar 57 , and the seventh bus bar 57 is connected to the second end of the bypass module 3 .

[0111] In this embodiment, the first end of the bypass module 3 can be the output end of the bypass module 3, and the second end of the bypass module 3 can be the input end of the bypass module 3, that is, the seventh bus bar 57 is connected to the input end of the bypass module 3, and one end of the third bus bar 53 is connected to the output end of the bypass module 3.

[0112] The other ends of the two battery strings 100 of the third battery string group 103 are respectively connected to the seventh bus bar 57 via welding ribbons, and the other ends of the two battery strings 100 of the sixth battery string group 106 are respectively connected to the seventh bus bar 57 via welding ribbons. The polarity of the two battery strings 100 of the third battery string group 103 connected to the seventh bus bar 57 is the same as the polarity of the two battery strings 100 of the sixth battery string group 106 connected to the seventh bus bar 57, thereby achieving parallel connection of the third battery string group 103 and the sixth battery string group 106. For example, the negative electrodes of the two battery strings 100 of the third battery string group 103 are connected to the seventh bus bar 57, and the negative electrodes of the two battery strings 100 of the sixth battery string group 106 are connected to the seventh bus bar 57.

[0113] As an embodiment of the present invention, it also includes:

[0114] The lead 58 is connected to the sixth bus bar 56 , and the second battery string group 102 and the third battery string group 103 are connected in series through the sixth bus bar 56 and the lead 58 , and the fifth battery string group 105 and the sixth battery string group 106 are connected in series through the sixth bus bar 56 and the lead 58 .

[0115] In this embodiment, the fourth bus bar 54 and the fifth bus bar 55 are electrically connected through the lead 58, and the lead 58 is electrically connected to the sixth bus bar 56, so that the sixth bus bar 56 is connected in series with the second battery string group 102 and the third battery string group 103 through the lead 58, and the sixth bus bar 56 is connected in series with the fifth battery string group 105 and the sixth battery string group 106 through the lead 58.

[0116] The materials of the lead wire 58 and the bus bar can be the same or different. The first bus bar 51, the second bus bar 52, the third bus bar 53, the fourth bus bar 54, the fifth bus bar 55, the sixth bus bar 56, the seventh bus bar 57, and the lead wire 58 are all made of metal, such as aluminum bars, copper bars, or tin bars. The lead wire 58 is used to connect the fourth bus bar 54 with the sixth bus bar 56 and the fifth bus bar 55 with the sixth bus bar 56, thereby realizing the series connection of the second battery string group 102 with the third battery string group 103, and the series connection of the fifth battery string group 105 with the sixth battery string group 106. Moreover, only one lead wire 58 is needed to realize the parallel connection of the first battery unit 1 and the second unit with the bypass module 3. While reducing the number of bypass modules 3, the number of lead wires 58 can be reduced, which can further reduce costs and reduce the difficulty of the photovoltaic module assembly process.

[0117] As an embodiment of the present invention, the bypass module 3 is located between the third bus bar 53 and the seventh bus bar 57 , and the third bus bar 53 and the seventh bus bar 57 are linearly arranged along the second direction X.

[0118] In this embodiment, the bypass module 3 is encapsulated in the junction box 4 between the third bus bar 53 and the seventh bus bar 57. The third bus bar 53 and the seventh bus bar 57 are both extended along the second direction X. The third bus bar 53 and the seventh bus bar 57 are arranged linearly along the second direction X, that is, the central axes of the third bus bar 53 and the seventh bus bar 57 are collinear along the second direction X, facilitating the connection of the third bus bar 53 and the seventh bus bar 57 to the bypass module 3 respectively.

[0119] Please refer to Figure 2 and Figure 4 As an embodiment of the present invention, the sixth bus bar 56 is arranged above the seventh bus bar 57 , the sixth bus bar 56 and the seventh bus bar 57 at least partially overlap, and an insulating strip 6 is provided between the seventh bus bar 57 and the sixth bus bar 56 .

[0120] In this embodiment, since the seventh bus bar 57 connects the third battery string group 103 and the sixth battery string group 106 in parallel, and the seventh bus bar 57 needs to extend to the bypass module 3, the seventh bus bar 57 needs to cross the sixth bus bar 56 and be connected to the bypass module 3. By arranging the sixth bus bar 56 above the seventh bus bar 57, the seventh bus bar 57 can be extended straight to the bypass module 3, preventing the seventh bus bar 57 from bending and crossing the sixth bus bar 56, and preventing the seventh bus bar 57 from bending and breaking, especially preventing the seventh bus bar 57 from bending and breaking during the lamination process, thereby improving the electrical conductivity reliability of the seventh bus bar 57, thereby improving the reliability of the module, and also facilitating the welding of the sixth bus bar 56 to the second battery string group 103 and the fifth battery string group 103. In addition, an insulating strip 6 is provided between the seventh bus bar 57 and the sixth bus bar 56. The insulating strip 6 can prevent the seventh bus bar 57 and the sixth bus bar 56 from short-circuiting, thereby greatly improving the electrical conductivity of the seventh bus bar 57 and the sixth bus bar 56. Optionally, the sixth bus bar 56 and the seventh bus bar 57 are both extended along the second direction X, and the length of the overlapping area between the sixth bus bar 56 and the seventh bus bar 57 in the first direction Y is 3 to 12 mm, which can ensure that the sixth bus bar 56 and the seventh bus bar 57 are stably placed on the seventh bus bar 57. In addition, when the seventh bus bar 57 overlaps with the sixth bus bar 56, in some other embodiments, the seventh bus bar 57 can also be provided above the sixth bus bar 56, so that the sixth bus bar 56 and the seventh bus bar 57 at least partially overlap, and the insulating strip 6 is provided between the seventh bus bar 57 and the sixth bus bar 56.

[0121] like Figure 2As shown, as an embodiment of the present invention, a gap is provided between the battery string 100 of the first battery cell 1 and the battery string 100 of the second battery cell 2, and the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are all located in the gap between the battery string 100 of the first battery cell 1 and the battery string 100 of the second battery cell 2.

[0122] In this embodiment, the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are all located in the gap between the battery string 100 of the first battery unit 1 and the battery string 100 of the second battery unit 2. Compared to the case where the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are located on the back of the battery cells 111 of the battery string 100, the problem of the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 causing cracks during the lamination process can be avoided. In this embodiment, the third bus bar 53 and the seventh bus bar 57 can be arranged collinearly, and the sixth bus bar 56 and the seventh bus bar 57 can be staggered in the first direction Y, or can be arranged to at least partially overlap.

[0123] like Figure 3 As shown in FIG. 5 , as another embodiment of the present invention, the sixth bus bar 56 and the seventh bus bar 57 are staggered in the first direction Y, and there is no overlapping area between the sixth bus bar 56 and the seventh bus bar 57 .

[0124] In this embodiment, since the sixth bus bar 56 and the seventh bus bar 57 are staggered in the first direction Y, and there is no overlap between the seventh bus bar 57 and the sixth bus bar 56, there is no need to set the first insulating strip 61 on the seventh bus bar 57 to prevent the seventh bus bar 57 and the sixth bus bar 56 from short-circuiting, which can reduce the number of insulating strips; more importantly, the sixth bus bar 56 and the seventh bus bar 57 are staggered in the first direction Y, and there is no overlapping area between the sixth bus bar 56 and the seventh bus bar 57, which avoids overlapping between the sixth bus bar 56 and the seventh bus bar 57, and can reduce the height of the battery assembly at the position of the seventh bus bar 57, so that the thickness of the battery assembly is more uniform, which can reduce the risk of battery cell 111 splitting.

[0125] As an embodiment of the present invention, the offset distance between the sixth bus bar 56 and the seventh bus bar 57 in the first direction Y is greater than 1 mm.

[0126] In this embodiment, the misalignment distance between the sixth bus bar 56 and the seventh bus bar 57 in the first direction Y is controlled to be greater than 1 mm, that is, the distance between the sixth bus bar 56 and the seventh bus bar 57 in the first direction Y is greater than 1 mm. This can prevent the seventh bus bar 57 and the sixth bus bar 56 from short-circuiting due to contact, reduce the number of insulating strips, and ensure that there is no overlapping area between the sixth bus bar 56 and the seventh bus bar 57, thereby reducing the risk of battery cell 111 splitting during the lamination process.

[0127] Please refer to Figure 3 As an embodiment of the present invention, there is no gap between the battery string 100 of the first battery unit 1 and the battery string 100 of the second battery unit 2, the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are all located on the back side of the battery cell 111 of the first battery unit 1 or the second battery unit 2, and an insulating strip 6 is provided between the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 and the back side of the battery cell 111.

[0128] In this embodiment, the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are all located on the back of the battery string 100 of the first battery unit 1 or the second battery unit 2, so that the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are all located on the back of the battery cell 111, which can achieve the hiding of the third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57. The third bus bar 53, the sixth bus bar 56, and the seventh bus bar 57 are not visible from the front of the battery assembly, which is conducive to further realizing the all-black design of the front of the battery assembly, and is conducive to increasing the proportion of the front area of ​​the battery cell 111 of the battery assembly, which is conducive to improving the power generation efficiency of the assembly.

[0129] Moreover, insulating strips 6 are provided between the third bus bar 53, the sixth bus bar 56, the seventh bus bar 57 and the back of the battery cell 111 to prevent the third bus bar 53, the sixth bus bar 56, the seventh bus bar 57 from short-circuiting with the welding strips and electrode grid lines on the battery cell 111.

[0130] like Figure 2 As shown, as an embodiment of the present invention, the first bus bar 51 is located outside the end of the first battery string group 101 and the second battery string group 102 away from the second battery unit 2, and the second bus bar 52 is located outside the end of the fourth battery string group 104 and the fifth battery string group 105 away from the first battery unit 1.

[0131] In this embodiment, the first bus bar 51 is located outside one end of the first battery string group 101 and the second battery string group 102 away from the second battery unit 2. It can be understood that the first bus bar 51 is located outside one end of the first battery string group 101 and the second battery string group 102, and one end of the first battery string group 101 and the second battery string group 102 is the end away from the second battery unit 2, so that the first bus bar 51 is located in the area where the battery cell 111 is not set, which can avoid the problem of the first bus bar 51 causing the battery cell 111 to split during the lamination process. Similarly, the second bus bar 52 is located outside one end of the fourth battery string group 104 and the fifth battery string group 105 away from the first battery unit 1. It can be understood that the second bus bar 52 is located outside one end of the fourth battery string group 104 and the fifth battery string group 105, and one end of the fourth battery string group 104 and the fifth battery string group 105 is the end away from the first battery unit 1, so that the second bus bar 52 is located in the area where the battery cell 111 is not set, which can avoid the problem of the second bus bar 52 causing the battery cell 111 to split during the lamination process.

[0132] As an embodiment of the present invention, the fourth bus bar 54 is located outside an end of the third battery string 103 away from the second battery unit 2 , and the fifth bus bar 55 is located outside an end of the sixth battery string 106 away from the first battery unit 1 .

[0133] In this embodiment, the fourth bus bar 54 is located outside the end of the third battery string group 103 away from the second battery unit 2. It can be understood that the fourth bus bar 54 is located outside the end of the third battery string group 103, and the end of the third battery string group 103 is the end away from the second battery unit 2, so that the fourth bus bar 54 is located in the area where the battery cell 111 is not set, which can avoid the problem of the fourth bus bar 54 causing the battery cell 111 to split during the lamination process.

[0134] like Figure 3 As shown, as an embodiment of the present invention, the first bus bar 51 is located on the back side of the battery cell 111 of the first battery string group 101 and the second battery string group 102 away from the second battery unit 2; the second bus bar 52 is located on the back side of the battery cell 111 of the fourth battery string group 104 and the fifth battery string group 105 away from the first battery unit 1, and an insulating strip 6 is provided between the first bus bar 51 and the battery cell 111 and between the second bus bar 52 and the battery cell 111.

[0135] In this embodiment, the first bus bar 51 is located on the back of the battery cell 111 at one end of the first battery string group 101 and the second battery string group 102 away from the second battery unit 2. It can be understood that the first bus bar 51 is located on the battery cell 111 at one end of the first battery string group 101 and the second battery string group 102, and one end of the first battery string group 101 and the second battery string group 102 is the end away from the second battery unit 2, so that the first bus bar 51 is located on the back of the battery cell 111, which can achieve the hiding of the first bus bar 51. The first bus bar 51 cannot be seen from the front of the battery assembly, which is conducive to achieving a full black design on the front of the battery assembly, and is conducive to increasing the proportion of the front area of ​​the battery cell 111 of the battery assembly, which is conducive to improving the power generation efficiency of the assembly. Similarly, the second bus bar 52 is located on the back of the battery cell 111 at one end of the fourth battery string group 104 and the fifth battery string group 105 away from the first battery unit 1. It can be understood that the second bus bar 52 is located on the battery cell 111 at one end of the fourth battery string group 104 and the fifth battery string group 105, and one end of the fourth battery string group 104 and the fifth battery string group 105 is the end away from the first battery unit 1, so that the second bus bar 52 is located on the back of the battery cell 111, which can achieve the hiding of the second bus bar 52. The second bus bar 52 cannot be seen from the front of the battery assembly, which is conducive to further realizing the all-black design of the front of the battery assembly, and is conducive to increasing the proportion of the front area of ​​the battery cell 111 of the battery assembly, which is conducive to improving the power generation efficiency of the assembly.

[0136] Moreover, an insulating strip 6 is provided between the first bus bar 51 and the battery cell 111 to prevent the first bus bar 51 from contacting and short-circuiting with the welding strips and electrode grid lines on the battery cell 111; an insulating strip 6 is provided between the second bus bar 52 and the battery cell 111 to prevent the second bus bar 52 from contacting and short-circuiting with the welding strips and electrode grid lines on the battery cell 111.

[0137] As an embodiment of the present invention, the fourth bus bar 54 is located on the back side of the battery cell 111 at the end of the third battery string group 103 away from the second battery unit 2, the fifth bus bar 55 is located on the back side of the battery cell 111 at the end of the sixth battery string group 106 away from the first battery unit 1, and an insulating strip 6 is provided between the fourth bus bar 54 and the battery cell 111 and between the fifth bus bar 55 and the battery cell 111.

[0138] In this embodiment, the fourth bus bar 54 is located on the back of the battery cell 111 at the end of the third battery string 103 away from the second battery unit 2, which can hide the first bus bar 51. The fourth bus bar 54 is not visible from the front of the battery assembly, which is conducive to achieving a completely black front design of the battery assembly, and is conducive to increasing the proportion of the front area of ​​the battery cell 111 of the battery assembly, which is conducive to improving the power generation efficiency of the assembly. Similarly, the fifth bus bar 55 is located on the back of the battery cell 111 at the end of the sixth battery string 106 away from the first battery unit 1, which can hide the fifth bus bar 55. The fifth bus bar 55 is not visible from the front of the battery assembly, which is conducive to further achieving a completely black front design of the battery assembly, and is conducive to increasing the proportion of the front area of ​​the battery cell 111 of the battery assembly, which is conducive to improving the power generation efficiency of the assembly.

[0139] Moreover, an insulating strip 6 is provided between the fourth bus bar 54 and the battery cell 111 to prevent the fourth bus bar 54 from contacting and short-circuiting with the welding strips and electrode grid lines on the battery cell 111; an insulating strip 6 is provided between the fifth bus bar 55 and the battery cell 111 to prevent the fifth bus bar 55 from contacting and short-circuiting with the welding strips and electrode grid lines on the battery cell 111.

[0140] As an embodiment of the present invention, the sixth bus bar 56 and the seventh bus bar 57 are both located on the back side of the battery cell 111 of the first battery unit 1 or the second battery unit 2 .

[0141] In this embodiment, the sixth bus bar 56 and the seventh bus bar 57 are both located on the back side of the battery cell 111 of the first battery unit 1 or the second battery unit 2, that is, the sixth bus bar 56 and the seventh bus bar 57 are located on the same side of the central axis of the photovoltaic module, which facilitates the connection between the sixth bus bar 56 and the seventh bus bar 57 and the corresponding battery string 100.

[0142] As an embodiment of the present invention, the seventh bus bar 57 is located on the back side of the second battery string group 102 and the third battery string group 103 , and the sixth bus bar 56 is located on the back side of the fifth battery string group 105 .

[0143] In this embodiment, one of the sixth bus bar 56 and the seventh bus bar 57 is located on the back side of the battery cell 111 of the first battery unit 1, and the other is located on the back side of the battery cell 111 of the second battery unit 2, so that the sixth bus bar 56 and the seventh bus bar 57 are staggered in the first direction Y to avoid stacking of the sixth bus bar 56 and the seventh bus bar 57. The height of the battery assembly at the position of the seventh bus bar 57 can be reduced, the thickness of the battery assembly can be made more uniform, and the risk of battery cell 111 cracking during the lamination process can be reduced.

[0144] In the embodiment of the present invention, a gap may or may not be provided between the second battery string group 102 and the third battery string group 103 ; a gap may or may not be provided between the fifth battery string group 105 and the sixth battery string group 106 .

[0145] As an embodiment of the present invention, the lead wire 58 is located in the gap between the second battery string group 102 and the third battery string group 103 and in the gap between the fifth battery string group 105 and the sixth battery string group 106 .

[0146] In this embodiment, when gaps are provided between the second battery string group 102 and the third battery string group 103 and between the fifth battery string group 105 and the sixth battery string group 106, the lead 58 is located in the gaps between the second battery string group 102 and the third battery string group 103 and between the fifth battery string group 105 and the sixth battery string group 106 and extends along the first direction Y. One end of the lead 58 is connected to the fourth bus bar 54, the other end of the lead 58 is connected to the fifth bus bar 55, and the middle portion of the lead 58 is connected to the sixth bus bar 56. By arranging the lead 58 in the gap between the second battery string group 102 and the third battery string group 103 and in the gap between the fifth battery string group 105 and the sixth battery string group 106, the lead 58 can be prevented from contacting the battery cell 111, and there is no need to arrange the insulating strip 6 to isolate the lead 58 from the battery cells 111 of the second battery string group 102, the third battery string group 103, the fifth battery string group 105 and the sixth battery string group 106, thereby reducing the process difficulty and cost; moreover, the lead 58 does not overlap with the battery cells 111 of the second battery string group 102, the third battery string group 103, the fifth battery string group 105 and the sixth battery string group 106, thereby preventing the lead 58 from causing the battery cell 111 to crack during the lamination process.

[0147] In this embodiment, the width of the gap between the second battery string group 102 and the third battery string group 103 is greater than the width of the lead 58, and the width of the gap between the fifth battery string group 105 and the sixth battery string group 106 is greater than the width of the lead 58. This prevents the lead 58 from contacting the battery cell 111, eliminates the need for insulating strips 6 to isolate the lead 58 from the battery cell 111, and reduces process difficulty and cost.

[0148] As an embodiment of the present invention, the width of the gap between the second battery string group 102 and the third battery string group 103 is greater than the width of the gap between the first battery string group 101 and the second battery string group 102 , and the width of the gap between the fifth battery string group 105 and the sixth battery string group 106 is greater than the width of the gap between the fourth battery string group 104 and the fifth battery string group 105 .

[0149] In this embodiment, the width of the gap between the second battery string group 102 and the third battery string group 103 is controlled to be greater than the width of the gap between the first battery string group 101 and the second battery string group 102, and the width of the gap between the fifth battery string group 105 and the sixth battery string group 106 is controlled to be greater than the width of the gap between the fourth battery string group 104 and the fifth battery string group 105. That is, by increasing the width of the gap between the second battery string group 102 and the third battery string group 103 and the width of the gap between the fifth battery string group 105 and the sixth battery string group 106, the gap between the lead 58 and the battery cell 111 is increased, the risk of short circuit between the lead 58 and the battery cell 111 is reduced, and the risk of the lead 58 causing the battery cell 111 to crack during the lamination process can be further reduced.

[0150] As one embodiment of the present invention, the lead 58 is located on the back side of the battery cell 111 of the second battery string group 102 and / or the third battery string group 103, and the lead 58 is located on the back side of the battery cell 111 of the fifth battery string group 105 and / or the sixth battery string group 106, and an insulating strip 6 is provided between the lead 58 and the battery cell 111.

[0151] In this embodiment, there may be a gap between the second battery string group 102 and the third battery string group 103, and there may be a gap between the fifth battery string group 105 and the sixth battery string group 106. However, the width of the gap between the second battery string group 102 and the third battery string group 103 and the width of the gap between the fifth battery string group 105 and the sixth battery string group 106 are smaller than the width of the lead 58. In this case, the lead 58 can be located on the back side of the battery cells 111 of the second battery string group 102 and the third battery string group 103, and the lead 58 is located on the back side of the battery cells 111 of the fifth battery string group 105 and the sixth battery string group 106. That is, the lead 58 is centered in the gap between the second battery string group 102 and the third battery string group 103 and the gap between the fifth battery string group 105 and the sixth battery string group 106. In addition, the second battery string group 102 and the third battery string group 103 may also be arranged without a gap, and the lead 58 is arranged along the intersection line between the second battery string group 102 and the third battery string group 103 and the intersection line between the fifth battery string group 105 and the sixth battery string group 106.

[0152] Of course, when a gap is provided between the second battery string group 102 and the third battery string group 103, and a gap is provided between the fifth battery string group 105 and the sixth battery string group 106, the lead 58 can also be offset from the gap between the second battery string group 102 and the third battery string group 103, and from the gap between the fifth battery string group 105 and the sixth battery string group 106, so that the lead 58 is only located on the back side of the battery cell 111 of the second battery string group 102 and the back side of the battery cell 111 of the fifth battery string group 105, or the lead 58 is only located on the back side of the battery cell 111 of the third battery string group 103 and the back side of the battery cell 111 of the sixth battery string group 106.

[0153] Similarly, when there is no gap between the second battery string group 102 and the third battery string group 103, and there is no gap between the fifth battery string group 105 and the sixth battery string group 106, the lead 58 can also be offset from the intersection line of the second battery string group 102 and the third battery string group 103 and the intersection line of the fifth battery string group 105 and the sixth battery string group 106, so that the lead 58 is only located on the back side of the battery cell 111 of the second battery string group 102 and the back side of the battery cell 111 of the fifth battery string group 105, or the lead 58 is only located on the back side of the battery cell 111 of the third battery string group 103 and the back side of the battery cell 111 of the sixth battery string group 106.

[0154] In this embodiment, an insulating strip 6 is provided between the lead 58 and the battery cell 111 to prevent the lead 58 from contacting and short-circuiting with the soldering strip and the electrode grid line on the battery cell 111 .

[0155] As an embodiment of the present invention, the third bus bar 53 and the seventh bus bar 57 are sequentially arranged along the second direction X. The dimension of the third bus bar 53 along the second direction X is L1. The dimension of the battery cell 111 along the second direction X is d, and 1.5d<L1≤4d.

[0156] In this embodiment, the dimension L1 of the third bus bar 53 along the second direction X is the length of the third bus bar 53. Since one end of the third bus bar 53 and one end of the seventh bus bar 57 are both connected to the junction box 4, under the premise that the size of the battery assembly in the second direction X is fixed, the design of the dimension L1 of the third bus bar 53 along the second direction X will affect the design of the dimension L2 of the seventh bus bar 57 along the second direction X. That is, the length of the third bus bar 53 will affect the length of the seventh bus bar 57. By controlling the dimension L1 of the third bus bar 53 along the second direction X to satisfy 1.5d<L1≤4d, the difference between the lengths of the third bus bar 53 and the seventh bus bar 57 can be kept small, thus avoiding a large difference between the lengths of the third bus bar 53 and the seventh bus bar 57. This prevents the third bus bar 53 or the seventh bus bar 57 from being too long, and prevents the third bus bar 53 or the seventh bus bar 57 from generating excessive heat during operation and affecting the power generation performance of the battery assembly.

[0157] For example, the dimension of the battery cell 111 along the second direction X is d, and the dimension L1 of the third bus bar 53 along the second direction X can be any value of 1.51d, 1.55d, 1.6d, 2d, 2.2d, 2.4d, 2.5d, 2.7d, 2.9d, 3d, 3.2d, 3.4d, 3.5d, 3.8d, and 4d.

[0158] The present invention also provides a photovoltaic system including the battery assembly of the above embodiment. It should be noted that the photovoltaic system and the battery assembly have the same or similar beneficial effects, and the relevant aspects between the two can be referenced to each other. To avoid repetition, they will not be described here.

[0159] In this embodiment, the photovoltaic system can be applied to photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be applied to equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box and an inverter. The photovoltaic array can 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 junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter to be converted into the alternating current required by the mains power grid and then connected to the mains power network to achieve solar power supply.

[0160] Throughout this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0161] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery assembly, characterized in that: include: A first battery cell and a second battery cell are sequentially arranged along a first direction, the first battery cell and the second battery cell are arranged in parallel, the first battery cell and the second battery cell each include a plurality of battery string groups sequentially arranged along a second direction and connected in series, each of the battery string groups includes two battery strings sequentially arranged along the second direction and connected in parallel, the battery string includes a plurality of battery cells sequentially connected in series along the first direction, and the second direction intersects the first direction; and A bypass module is arranged in reverse parallel with the first battery unit and the second battery unit at the same time, one end of the first battery unit and the second battery unit is connected to the first end of the bypass module, and the other end of the first battery unit and the second battery unit is connected to the second end of the bypass module, one of the first end of the bypass module and the second end of the bypass module is the input end of the bypass module, and the other is the output end of the bypass module.

2. The battery assembly according to claim 1, wherein: The battery cell is one of a one-third battery cell obtained by cutting or splitting a whole battery cell, a quarter battery cell obtained by cutting or splitting a whole battery cell, a fifth battery cell obtained by cutting or splitting a whole battery cell, and a sixth battery cell obtained by cutting or splitting a whole battery cell.

3. The battery assembly according to claim 1, wherein: The first battery unit includes a first battery string group, a second battery string group, and a third battery string group connected in series in the second direction; the second battery unit includes a fourth battery string group, a fifth battery string group, and a sixth battery string group connected in series in the second direction; The first battery string group and the fourth battery string group are sequentially arranged along the first direction and connected in parallel, the second battery string group and the fifth battery string group are sequentially arranged along the first direction and connected in parallel, and the third battery string group and the sixth battery string group are arranged along the first direction and connected in parallel.

4. The battery assembly according to claim 3, characterized in that Also includes: a first bus bar, wherein the two battery strings of the first battery string group are connected in parallel via the first bus bar, the two battery strings of the second battery string group are connected in parallel via the first bus bar, and the first battery string group and the second battery string group are connected in series via the first bus bar; The two battery strings of the fourth battery string group are connected in parallel through the second bus bar, the two battery strings of the fifth battery string group are connected in parallel through the second bus bar, and the fourth battery string group and the fifth battery string group are connected in series through the second bus bar.

5. The battery assembly according to claim 3 or 4, characterized in that: Also includes: A third bus bar, through which the two battery strings of the first battery string group and the two battery strings of the fourth battery string group are connected in parallel, and the third bus bar is connected to the first end of the bypass module.

6. The battery assembly according to claim 5, characterized in that Also includes: a fourth bus bar, through which the two battery strings of the third battery string group are connected in parallel; A fifth bus bar, through which the two battery strings of the sixth battery string group are connected in parallel.

7. The battery assembly according to claim 5, characterized in that Also includes: A sixth bus bar is provided, through which the two battery strings of the second battery string group and the two battery strings of the fifth battery string group are connected in parallel, and the sixth bus bar connects the second battery string group and the third battery string group in series, and connects the fifth battery string group and the sixth battery string group in series.

8. The battery assembly according to claim 7, characterized in that Also includes: A seventh bus bar, through which the two battery strings of the third battery string group and the two battery strings of the sixth battery string group are connected in parallel, and the seventh bus bar is connected to the second end of the bypass module.

9. The battery assembly according to claim 7, wherein: Also includes: The sixth bus bar is connected to the lead, the second battery string group and the third battery string group are connected in series through the sixth bus bar and the lead, and the fifth battery string group and the sixth battery string group are connected in series through the sixth bus bar and the lead.

10. The battery assembly according to claim 8, characterized in that The bypass module is located between the third bus bar and the seventh bus bar, and the third bus bar and the seventh bus bar are linearly arranged along the second direction.

11. The battery assembly according to claim 8, characterized in that The sixth bus bar is arranged on the seventh bus bar, the sixth bus bar and the seventh bus bar at least partially overlap, and an insulating strip is arranged between the seventh bus bar and the sixth bus bar.

12. The battery assembly according to claim 8, wherein: A gap is provided between the battery string group of the first battery unit and the battery string group of the second battery unit, and the third bus bar, the sixth bus bar, and the seventh bus bar are all located in the gap between the battery string group of the first battery unit and the battery string group of the second battery unit.

13. The battery assembly according to claim 8, characterized in that The sixth bus bar and the seventh bus bar are staggered in the first direction, and there is no overlapping area between the sixth bus bar and the seventh bus bar.

14. The battery assembly according to claim 13, wherein: A misalignment distance between the sixth bus bar and the seventh bus bar in the first direction is greater than 1 mm.

15. The battery assembly according to claim 8, characterized in that There is no gap between the battery string of the first battery unit and the battery string of the second battery unit, the third bus bar, the sixth bus bar, and the seventh bus bar are all located on the back of the battery cell of the first battery unit or the second battery unit, and insulating strips are provided between the third bus bar, the sixth bus bar, and the seventh bus bar and the back of the battery cell.

16. The battery assembly according to claim 4, characterized in that The first bus bar is located outside one end of the first battery string group and the second battery string group away from the second battery unit, and the second bus bar is located outside one end of the fourth battery string group and the fifth battery string group away from the first battery unit.

17. The battery assembly according to claim 6, wherein: The fourth bus bar is located outside an end of the third battery string group away from the second battery unit, and the fifth bus bar is located outside an end of the sixth battery string group away from the first battery unit.

18. The battery assembly according to claim 4, characterized in that The first bus bar is located on the back side of the battery cell at one end of the first battery string group and the second battery string group away from the second battery unit; the second bus bar is located on the back side of the battery cell at one end of the fourth battery string group and the fifth battery string group away from the first battery unit, and insulating strips are provided between the first bus bar and the battery cell and between the second bus bar and the battery cell.

19. The battery assembly according to claim 6, wherein: The fourth bus bar is located on the back side of the battery cell at one end of the third battery string group away from the second battery unit, the fifth bus bar is located on the back side of the battery cell at one end of the sixth battery string group away from the first battery unit, and insulating strips are provided between the fourth bus bar and the battery cell and between the fifth bus bar and the battery cell.

20. The battery assembly according to claim 8, wherein: The sixth bus bar and the seventh bus bar are both located on the back side of the battery cell of the first battery unit or the second battery unit.

21. The battery assembly according to claim 8, wherein The seventh bus bar is located on the back of the second battery string group and the third battery string group, and the sixth bus bar is located on the back of the fifth battery string group.

22. The battery assembly according to claim 9, wherein: The lead is located at a gap between the second battery string group and the third battery string group and at a gap between the fifth battery string group and the sixth battery string group.

23. The battery assembly according to claim 22, wherein: The width of the gap between the second battery string group and the third battery string group is greater than the width of the gap between the first battery string group and the second battery string group, and the width of the gap between the fifth battery string group and the sixth battery string group is greater than the width of the gap between the fourth battery string group and the fifth battery string group.

24. The battery assembly according to claim 9, wherein: The lead is located on the back side of the battery cell of the second battery string group and / or the third battery string group, and the lead is located on the back side of the battery cell of the fifth battery string group and / or the sixth battery string group, and an insulating strip is provided between the lead and the battery cell.

25. The battery assembly according to claim 1, wherein A gap is provided between adjacent battery cells in each battery string.

26. The battery assembly according to claim 1, wherein Adjacent battery cells in each battery string partially overlap.

27. The battery assembly according to claim 1, wherein: A gap is provided between adjacent battery strings along the second direction, and a width of the gap between adjacent battery strings is 0.4 to 4 mm.

28. The battery assembly according to claim 1, wherein: Also includes: A junction box, wherein the bypass module is encapsulated in the junction box.

29. The battery assembly according to claim 1, wherein: The bypass module is a single bypass diode, one end of the first battery unit and the second battery unit is connected to the first end of the bypass diode at the same time, and the other end of the first battery unit and the second battery unit is connected to the second end of the bypass diode at the same time.

30. The battery assembly according to claim 29, wherein: The reverse bias voltage of the bypass diode is greater than or equal to 90V.

31. The battery assembly according to claim 8, characterized in that The third bus bar and the seventh bus bar are sequentially arranged along the second direction. The dimension of the third bus bar along the second direction is L1. The dimension of each battery cell along the second direction is d, and 1.5d<L1≤4d.

32. A photovoltaic system, characterized in that: A battery assembly comprising the battery assembly according to any one of claims 1 to 31.

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