Battery piece group, battery assembly and photovoltaic system
By connecting battery strings and diodes in parallel within the battery cell array, the total voltage is increased, solving the problem of reduced power generation caused by shading of battery cells in the battery module, thus achieving higher power generation and lower manufacturing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI FUSHAN AIKO SOLAR ENERGY TECH CO LTD
- Filing Date
- 2025-04-10
- Publication Date
- 2026-05-19
AI Technical Summary
In existing battery modules, a small number of shaded cells cause bypass diodes to conduct, preventing them from collecting current from other cells and reducing power generation and output.
Design a battery cell array in which battery strings are connected in parallel with diodes. This increases the total voltage of the battery strings connected to the diodes, reduces the risk of premature diode conduction, and optimizes the voltage distribution of the battery cell array through the parallel structure, thereby reducing power generation losses.
It increases the power generation of the battery module, reduces the number of diodes, lowers manufacturing costs, and enhances mechanical load performance and long-term reliability.
Smart Images
Figure CN224265385U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, and in particular to a battery cell pack, battery module and photovoltaic system. Background Technology
[0002] In a battery module, when a cell is shaded, a reverse current is generated, which can damage the cell. To prevent this damage, a bypass diode is connected to the cell. However, when the number of shaded, abnormal cells is small, the diode will conduct, preventing it from collecting the current generated by other normal cells connected in parallel with the diode. This reduces the overall output power of the battery module, resulting in significant power generation loss and a decrease in the module's power output.
[0003] Therefore, how to increase the power generation of battery modules has become an urgent problem to be solved. Utility Model Content
[0004] This invention provides a battery cell pack, a battery module, and a photovoltaic system to solve the technical problem of how to increase the power generation of a battery module.
[0005] This utility model is implemented as follows: it provides a battery cell pack, a battery module, and a photovoltaic system. A battery cell pack includes a first diode, a first battery string, and a second battery string. The first diode is connected in parallel with both the first and second battery strings. A first end of the first battery string and a first end of the second battery string are both connected to the input terminal of the first diode, and a second end of both the first and second battery strings are both connected to the output terminal of the first diode. Both the first and second battery strings include 12 to 60 battery cells connected in series.
[0006] Furthermore, the battery cell assembly also includes a second diode, a third battery string, and a fourth battery string. The second diode is connected in parallel with both the third and fourth battery strings. The third battery string is connected in series with the first battery string, and the fourth battery string is connected in series with the second battery string. The first end of both the third and fourth battery strings is connected to the input terminal of the second diode, and the second end of both the third and fourth battery strings is connected to the output terminal of the second diode. Both the third and fourth battery strings include 3 to 30 battery cells connected in series.
[0007] Furthermore, the battery pack also includes a first junction box and a second junction box, wherein the first diode is housed in the first junction box and the second diode is housed in the second junction box.
[0008] Furthermore, the battery pack also includes a first intermediate busbar, a second intermediate busbar, and a third intermediate busbar; the first battery string and the second battery string are connected in parallel through the first intermediate busbar and the second intermediate busbar; the third battery string and the fourth battery string are connected in parallel through the second intermediate busbar and the third intermediate busbar.
[0009] Furthermore, the first battery string includes a first sub-battery string and a second sub-battery string; the second battery string includes a third sub-battery string and a fourth sub-battery string.
[0010] Furthermore, the battery cell assembly also includes a fourth intermediate busbar and a fifth intermediate busbar; the first sub-cell string and the second sub-cell string are connected in series through the fourth intermediate busbar; the third sub-cell string and the fourth sub-cell string are connected in series through the fifth intermediate busbar.
[0011] Furthermore, the battery cell pack also includes a sixth intermediate busbar; the first sub-cell string and the second sub-cell string are connected in series through the sixth intermediate busbar; the third sub-cell string and the fourth sub-cell string are connected in series through the sixth intermediate busbar.
[0012] Furthermore, the voltage of the first battery string and the second battery string is 8V to 48V.
[0013] This utility model embodiment also provides a battery assembly, which includes the battery cell group as described above.
[0014] This utility model embodiment also provides a photovoltaic system, which includes the battery module as described above.
[0015] Thus, in the battery cell group of this utility model embodiment, since the first diode is connected in parallel with the first battery string and the second battery string respectively, and both the first battery string and the second battery string include 12 to 60 battery cells connected in series in sequence, the total voltage of the first battery string and the second battery string connected to the first diode is increased, thereby increasing the number of abnormal battery cells required for the first diode to reach the start-up threshold, reducing the risk of premature diode conduction, and thus reducing the power generation loss of the battery cell group and battery module, and increasing the power generation of the battery cell group and battery module. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of a photovoltaic system module provided in one embodiment of the present invention;
[0018] Figure 2 This is a schematic diagram of a battery assembly provided in one embodiment of the present invention;
[0019] Figure 3 This is a schematic diagram of the circuit structure of a battery cell pack provided in one embodiment of the present invention;
[0020] Figure 4 This is a partial structural schematic diagram of a battery cell pack provided in one embodiment of the present invention;
[0021] Figure 5 This is a partial structural schematic diagram of a battery cell pack provided in another embodiment of this utility model.
[0022] Key component symbols: 1000, Photovoltaic system; 1001, Battery module; 100, Cell array; 11, Cell; 12, First diode; 13, Second diode; 20, First battery string; 30, Second battery string; 40, Third battery string; 50, Fourth battery string; 21, First sub-cell string; 22, Second sub-cell string; 31, Third sub-cell string; 32, Fourth sub-cell string; 61, First junction box; 62, Second junction box; 71, First intermediate busbar; 72, Second intermediate busbar; 73, Third intermediate busbar; 74, Fourth intermediate busbar; 75, Fifth intermediate busbar; 76, Sixth intermediate busbar. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.
[0024] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "top", "bottom", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0028] like Figures 3 to 5 As shown, the battery cell assembly 100 provided in this embodiment of the present invention includes a first diode 12, a first battery string 20, and a second battery string 30. The first diode 12 is connected in parallel with the first battery string 20 and the second battery string 30, respectively. The first end of the first battery string 20 and the first end of the second battery string 30 are both connected to the input end of the first diode 12, and the second end of the first battery string 20 and the second end of the second battery string 30 are both connected to the output end of the first diode 12. The first battery string 20 and the second battery string 30 each include 12 to 60 battery cells 11 connected in series.
[0029] Thus, in the embodiment of this utility model, the battery cell group 100, since the first diode 12 is connected in parallel with the first battery string 20 and the second battery string 30 respectively, and the first battery string 20 and the second battery string 30 each include 12 to 60 battery cells 11 connected in series, increases the total voltage of the first battery string 20 and the second battery string 30 connected to the first diode 12, thereby increasing the number of abnormal battery cells 11 required for the first diode 12 to reach the start-up threshold, reducing the risk of premature diode conduction, thereby reducing the power generation loss of the battery cell group 100 and increasing the power generation of the battery cell group 100.
[0030] Specifically, the battery cell 11 in the embodiments of this application can be a whole cell, or a sliced battery cell 11 formed by cutting a whole solar cell, such as a two-piece, three-piece, or four-piece slice, etc., which are not limited here.
[0031] Understandably, the voltage of a solar cell is independent of its area, while its power is directly proportional to its area. Therefore, the voltage of the cell 11 formed by cutting a whole solar cell is the same as that of the whole solar cell, while the current and power are reduced proportionally. Compared to a whole solar cell, the cut cell 11 reduces internal losses, which is beneficial for increasing the power generation of the battery module 1001. At the same time, the cut cell 11 can reduce its size and reduce weld warping, thereby reducing the risks of galvanization, microcracks, misalignment of battery strings, and insufficient creepage distance.
[0032] Specifically, the first diode 12 is connected in parallel with both the first battery string 20 and the second battery string 30, i.e., the first battery string 20 and the second battery string 30 are connected in parallel. The ends of the first battery string 20 and the second battery string 30 with the same polarity are connected. For example, the positive terminal of the first battery string 20 is connected to the positive terminal of the second battery string 30, or the negative terminal of the first battery string 20 is connected to the negative terminal of the second battery string 30.
[0033] In this embodiment of the invention, the first battery string 20 and the second battery string 30 are connected in parallel by connecting the first end of the first battery string 20 to the first end of the second battery string 30, and by connecting the second end of the first battery string 20 to the second end of the second battery string 30. That is, the first ends of the first battery string 20 and the second battery string 30 have the same polarity, and the second ends of the first battery string 20 and the second battery string 30 have the same polarity. For example, both the first ends of the first battery string 20 and the first ends of the second battery string 30 are positive terminals, or both are negative terminals. Specifically, the first ends of the first battery string 20 and the second battery string 30 are connected in parallel, and the second ends of the first battery string 20 and the second battery string 30 are connected in parallel.
[0034] Specifically, both the first battery string 20 and the second battery string 30 include 12 to 60 battery cells 11 connected in series. That is, the first battery string 20 includes 12 to 60 battery cells 11, each battery cell 11 being connected in series, for example, 12, 15, 19, 20, 24, 30, 35, 36, 40, 48, 50, 55, or 60. Similarly, the second battery string 30 includes 12 to 60 battery cells 11, each battery cell 11 being connected in series, for example, 12, 15, 19, 20, 24, 30, 35, 36, 40, 48, 50, 55, or 60.
[0035] It is understandable that the arrangement of the individual battery cells 11 in the first battery string 20 and / or the second battery string 30 can be as follows: each battery cell 11 can be connected in series to form a battery string, or multiple battery cells 11 can be connected in series to form battery sub-strings, and then multiple battery sub-strings can be connected in series to form a complete battery string.
[0036] Specifically, the first end of the first battery string 20 and the first end of the second battery string 30 are both connected to the input terminal of the first diode 12, and the second ends of the first battery string 20 and the second battery string 30 are both connected to the output terminal of the first diode 12. Thus, the first diode 12 can function as a bypass diode. When there are a large number of blocked battery cells 11 in the first battery string 20 and / or the second battery string 30 (i.e., abnormal battery cells 11), and the reverse current generated by the first battery string 20 and / or the second battery string 30 is excessive, the first diode 12 can conduct, bypassing the first battery string 20 and the second battery string 30, preventing the generated reverse current from damaging the battery cells 11 in the first battery string 20 and / or the second battery string 30.
[0037] It is understood that in this embodiment of the invention, the conduction threshold of the first diode 12 is fixed. When the first battery string 20 and the second battery string 30 generate a sufficiently large reverse current, the first diode 12 conducts, bypassing the first battery string 20 and the second battery string 30. The first battery string 20 and the second battery string 30 are connected in parallel, so the voltages of the first battery string 20 and the second battery string 30 are the same. Furthermore, the magnitude of the reverse current generated by the first battery string 20 and the second battery string 30 is related to the voltage of the first battery string 20 or the second battery string 30 and the number of abnormal battery cells 11 in the first battery string 20 and the second battery string 30.
[0038] Therefore, the higher the voltage of the first battery string 20 or the second battery string 30, the more abnormal battery cells 11 are needed in the first battery string 20 and the second battery string 30 to provide sufficient reverse current to conduct the first diode 12. Therefore, in this embodiment of the invention, both the first battery string 20 and the second battery string 30 include 12 to 60 battery cells 11 connected in series. Compared to the prior art, this increases the number of battery cells 11 connected in series in the battery string, increases the total voltage of the battery string controlled by one diode, thereby increasing the number of abnormal battery cells 11 required for the first diode 12 to reach the start-up threshold, reducing the risk of premature conduction of the first diode 12, and thus reducing the power generation loss of the battery module 1001 and increasing the power generation of the battery module 1001.
[0039] In one possible implementation, the voltage of the first battery string 20 and the second battery string 30 is between 8V and 48V. For example, 8V, 16V, 24V, 32V, 40V, and 48V. This increases the number of abnormal battery cells 11 required for the first diode 12 to reach the start-up threshold, reduces the risk of premature conduction of the first diode 12, thereby reducing power generation losses in the battery module 1001 and increasing the power generation of the battery module 1001.
[0040] Meanwhile, in this embodiment of the invention, the number of battery cells 11 in the battery string controlled by one diode is increased, thereby reducing the number of diodes in the battery assembly 1001. This, in turn, reduces the number of junction boxes used to house the diodes, thus reducing the manufacturing cost of the battery assembly 1001. Furthermore, it reduces the increased number of openings required for the corresponding junction boxes in the battery assembly 1001, decreases the risk of moisture penetration, increases the mechanical load capacity of the battery assembly 1001, and improves the long-term reliability of the battery assembly 1001.
[0041] Furthermore, because the bias voltage of the diode is limited, the number of battery cells 11 connected in series in the first battery string 20 and the second battery string 30 cannot be too large.
[0042] Furthermore, the solar cell 11 can be formed by dividing a whole solar cell into two, three, four, five, or other equal parts. The solar cell 11 can be formed by dividing a whole solar cell into four equal parts. The specific division ratio of the whole solar cell is not limited here.
[0043] Furthermore, the direction in which the entire solar cell is cut can be parallel to the extension direction of the fine grid of the solar cell, perpendicular to the extension direction of the fine grid, or at other angles to the extension direction of the fine grid.
[0044] Furthermore, all the solar cells 11 in the solar cell array 100 are composed of solar cells of the same area divided equally in the same proportion. Thus, all the solar cells 11 in the solar cell array 100 have the same current, and their voltage is unaffected, resulting in the same power output. Therefore, no further processing for current or power matching is required.
[0045] Specifically, the solar cell 11 includes at least one of IBC cells, PERC cells, and Topcon cells. The specific form of the entire solar cell 11 is not limited here.
[0046] Specifically, the solar cell 11 can be a cell with a main grid or a cell without a main grid.
[0047] Furthermore, the back-contact cells of all the cells 11 in the cell pack 100 can be of the same or different types; their areas can be the same or different.
[0048] like Figure 2 As shown, specifically, the battery cell pack 100, after being packaged, can form a battery module 1001. The battery module 1001 can be a double-glass module or a single-glass module; the layout of the battery module 1001 can be a 54-pane, 60-pane, 72-pane, or other layouts. No specific limitation is made here regarding the specific form of the battery module 1001.
[0049] In one possible implementation, the battery cell group 100 further includes a second diode 13, and the battery cell group 100 also includes a third battery string 40 and a fourth battery string 50. The third battery string 40 and the fourth battery string 50 are connected in parallel, and the third battery string 40 is connected in series with the first battery string 20, and the fourth battery string 50 is connected in series with the second battery string 30. The first end of the third battery string 40 and the first end of the fourth battery string 50 are both connected to the input end of the second diode 13, and the second end of the third battery string 40 and the second end of the fourth battery string 50 are both connected to the output end of the second diode 13. The third battery string 40 and the fourth battery string 50 each include 16 to 20 battery cells 11 connected in series.
[0050] Thus, in the battery cell assembly 100 of this embodiment, only two diodes are needed to manage all the battery cells 11. Compared to the prior art, which requires three diodes, the battery cell assembly 100 arrangement in this embodiment reduces the number of diodes. Correspondingly, the number of junction boxes for housing the diodes can be reduced, thereby reducing the manufacturing cost of the battery assembly 1001. This further reduces the increase in the number of openings required for the junction boxes in the battery assembly 1001, decreases the risk of moisture penetration, increases the mechanical load performance of the battery assembly 1001, and improves the long-term reliability of the battery assembly 1001.
[0051] Specifically, the second diode 13 is connected in parallel with both the third battery string 40 and the fourth battery string 50, i.e., the third battery string 40 and the fourth battery string 50 are connected in parallel. The ends of the third battery string 40 and the fourth battery string 50 with the same polarity are connected. For example, the positive terminal of the third battery string 40 is connected to the positive terminal of the fourth battery string 50, or the negative terminal of the third battery string 40 is connected to the negative terminal of the fourth battery string 50.
[0052] In this embodiment of the invention, the third battery string 40 and the fourth battery string 50 are connected in parallel by connecting the first end of the third battery string 40 to the first end of the fourth battery string 50, and by connecting the second end of the third battery string 40 to the second end of the fourth battery string 50. That is, the first ends of the third battery string 40 and the fourth battery string 50 have the same polarity, and the second ends of the third battery string 40 and the fourth battery string 50 have the same polarity. For example, both the first ends of the third battery string 40 and the fourth battery string 50 may be positive, or both may be negative. Specifically, the first ends of the third battery string 40 and the fourth battery string 50 are connected in parallel, and the second ends of the third battery string 40 and the fourth battery string 50 are connected in parallel.
[0053] Specifically, both the first battery string 20 and the second battery string 30 include 3 to 30 battery cells 11 connected in series. That is, the first battery string 20 includes 3 to 30 battery cells 11, each connected in series, for example, 3, 6, 9, 10, 12, 15, 18, 20, 21, 24, 25, 27, or 30. And the second battery string 30 includes 16 to 20 battery cells 11, each connected in series, for example, 3, 6, 9, 10, 12, 15, 18, 20, 21, 24, 25, 27, or 30.
[0054] It is understandable that the arrangement of the individual battery cells 11 in the third battery string 40 and / or the fourth battery string 50 can be as follows: each battery cell 11 can be connected in series to form a battery string, or multiple battery cells 11 can be connected in series to form battery sub-strings, and then the multiple battery sub-strings can be connected in series to form a complete battery string.
[0055] Specifically, the first end of the third battery string 40 and the first end of the fourth battery string 50 are both connected to the input terminal of the second diode 13, and the second ends of the third battery string 40 and the fourth battery string 50 are both connected to the output terminal of the second diode 13. Thus, the second diode 13 can function as a bypass diode. When there are a large number of blocked battery cells 11 in the third battery string 40 and / or the fourth battery string 50 (i.e., abnormal battery cells 11), and the reverse current generated by the third battery string 40 and / or the fourth battery string 50 is excessive, the second diode 13 can conduct, bypassing the third battery string 40 and the fourth battery string 50, preventing the generated reverse current from damaging the battery cells 11 in the third battery string 40 and / or the fourth battery string 50.
[0056] Specifically, the third battery string 40 is connected in series with the first battery string 20, meaning that the ends of the third battery string 40 and the first battery string 20 with different polarities are connected. For example, the negative terminal of the third battery string 40 is connected to the positive terminal of the first battery string 20, or the positive terminal of the third battery string 40 is connected to the negative terminal of the first battery string 20.
[0057] Specifically, the fourth battery string 50 is connected in series with the second battery string 30, meaning that the ends of the fourth battery string 50 and the second battery string 30 with different polarities are connected. For example, the negative terminal of the fourth battery string 50 is connected to the positive terminal of the second battery string 30, or the positive terminal of the fourth battery string 50 is connected to the negative terminal of the second battery string 30.
[0058] Optionally, the number of battery cells 11 connected in series in the first battery string 20 and the second battery string 30 can be greater than or equal to the number of battery cells 11 connected in series in the third battery string 40 and the fourth battery string 50. No limitation is imposed here.
[0059] In one possible implementation, the voltages of the third battery string 40 and the fourth battery string 50 are between 2V and 20V. For example, 2V, 4V, 5V, 6V, 8V, 10V, 12V, 14V, 15V, 16V, 18V, and 20V. This increases the number of abnormal battery cells 11 required for the second diode 13 to reach its start-up threshold, reducing the risk of premature conduction of the second diode 13, thereby reducing power generation losses in the battery module 1001 and increasing the power generation of the battery module 1001.
[0060] In one possible implementation, the battery cell assembly 100 further includes a first junction box 61 and a second junction box 62, with the first diode 12 housed in the first junction box 61 and the second diode 13 housed in the second junction box 62. Thus, in this embodiment of the invention, the battery cell assembly 100 only requires two junction boxes for housing the diodes, compared to the prior art which requires three junction boxes. This reduction in the number of junction boxes in this embodiment reduces the manufacturing cost of the battery module 1001. Furthermore, it reduces the number of openings required for the corresponding junction boxes in the battery module 1001, decreases the risk of moisture penetration, increases the mechanical load capacity of the battery module 1001, and improves the long-term reliability of the battery module 1001.
[0061] like Figure 4 and Figure 5 As shown, in one possible implementation, the battery cell pack 100 further includes a first intermediate busbar 71, a second intermediate busbar 72, and a third intermediate busbar 73; the first battery string 20 and the second battery string 30 are connected in parallel through the first intermediate busbar 71 and the second intermediate busbar 72; the third battery string 40 and the fourth battery string 50 are connected in parallel through the second intermediate busbar 72 and the third intermediate busbar 73.
[0062] Thus, by setting the first intermediate busbar 71 and the second intermediate busbar 72, the first battery string 20 and the second battery string 30 can be connected in parallel. At the same time, by setting the second intermediate busbar 72 and the third intermediate busbar 73, the third battery string 40 and the fourth battery string 50 can be connected in parallel.
[0063] Specifically, the first intermediate busbar 71 is electrically connected to the solder strips located at the first end of the first battery string 20 and the first end of the second battery string 30, respectively, to facilitate the extraction of the current collected by the solder strips. The first end of the first battery string 20 is connected in parallel with the first end of the second battery string 30 through the first intermediate busbar 71.
[0064] Specifically, the third intermediate busbar 73 is electrically connected to the solder strips located at the second end of the third battery string 40 and the second end of the fourth battery string 50, respectively, to facilitate the extraction of the current collected by the solder strips. The second end of the third battery string 40 is connected in parallel with the second end of the fourth battery string 50 through the third intermediate busbar 73.
[0065] Specifically, the second intermediate busbar 72 is electrically connected to the solder strips located at the second end of the first battery string 20 and the second end of the second battery string 30, respectively, to facilitate the extraction of the current collected by the solder strips. The second end of the first battery string 20 is connected in parallel with the second end of the second battery string 30 through the second intermediate busbar 72. Simultaneously, the second intermediate busbar 72 is electrically connected to the solder strips located at the first end of the third battery string 40 and the first end of the fourth battery string 50, respectively, to facilitate the extraction of the current collected by the solder strips. The first end of the third battery string 40 is connected in parallel with the first end of the fourth battery string 50 through the second intermediate busbar 72.
[0066] It is understandable that on the second intermediate busbar 72, the solder strips provided in the first battery string 20 and the second battery string 30 are insulated from the solder strips provided in the third battery string 40 and the fourth battery string 50 by an insulating structure to prevent short-circuit loss of the battery cells 11.
[0067] Specifically, one end of the first intermediate busbar 71 can be bent out and connected to the first diode 12. Both ends of the second intermediate busbar 72 can be bent out and connected to the first diode 12 and the second diode 13. One end of the third intermediate busbar 73 can be bent out and connected to the second diode 13.
[0068] Optionally, the first junction box 61 may be located between the first intermediate busbar 71 and the second intermediate busbar 72; the second junction box 62 may be located between the second intermediate busbar 72 and the third intermediate busbar 73.
[0069] Optionally, the first intermediate busbar 71 can be disposed on the side or back of the solar cell 11 in the cell pack 100. This provides multiple placement options for the first intermediate busbar 71, adapting to more practical production scenarios. It is understood that placing the first intermediate busbar 71 on the side of the solar cell 11 in the cell pack 100 can reduce the space occupied by the first intermediate busbar 71 without affecting the solar cell's light reception, thereby reducing the module size and helping to lower costs.
[0070] Optionally, the second intermediate busbar 72 can be located on the side or back of the solar cell 11 in the cell pack 100. This provides multiple possible placement positions for the second intermediate busbar 72, adapting to more practical production scenarios. It is understood that placing the second intermediate busbar 72 on the side of the solar cell 11 in the cell pack 100 can reduce the space occupied by the second intermediate busbar 72 without affecting the solar cell's light reception, thereby reducing the module size and helping to lower costs.
[0071] Optionally, the third intermediate busbar 73 can be located on the side or back of the solar cell 11 in the cell pack 100. This provides multiple placement options for the third intermediate busbar 73, adapting to more practical production scenarios. It is understood that placing the third intermediate busbar 73 on the side of the solar cell 11 in the cell pack 100 reduces the space occupied by the third intermediate busbar 73 without affecting the solar cell's light reception, thereby reducing the module size and helping to lower costs.
[0072] like Figure 4 As shown, in one possible implementation, the battery cell pack 100 further includes a third intermediate busbar 73 and a fourth intermediate busbar 74; the first battery string 20 and the second battery string 30 are connected in series through the third intermediate busbar 73; and the third battery string 40 and the fourth battery string 50 are connected in series through the fourth intermediate busbar 74.
[0073] Thus, by setting the third intermediate busbar 73, the first battery string 20 and the second battery string 30 can be connected in parallel. At the same time, by setting the second intermediate busbar 72, the third battery string 40 and the fourth battery string 50 can be connected in parallel.
[0074] In one possible implementation, for the specific connection structure in the first battery string 20 and the second battery string 30, the first battery string 20 includes a first sub-battery string 21 and a second sub-battery string 22; the second battery string 30 includes a third sub-battery string 31 and a fourth sub-battery string 32.
[0075] Optionally, in some embodiments, the battery cell pack 100 further includes a fourth intermediate busbar 74 and a fifth intermediate busbar 75; the first sub-cell string 21 and the second sub-cell string 22 are connected in series through the fourth intermediate busbar 74; and the third sub-cell string 31 and the fourth sub-cell string 32 are connected in series through the fifth intermediate busbar 75.
[0076] Thus, by setting the fourth intermediate busbar 74, the first sub-battery string 21 and the second sub-battery string 22 can be connected in series. At the same time, by setting the fifth intermediate busbar 75, the third sub-battery string 31 and the fourth sub-battery string 32 can be connected in series.
[0077] It can be understood that the fourth intermediate busbar 74 and the fifth intermediate busbar 75 can be located on the side or back of the battery cell 11 in the battery cell pack 100. In this way, multiple installation positions of the fourth intermediate busbar 74 and the fifth intermediate busbar 75 are provided, which can adapt to more actual production scenarios.
[0078] Meanwhile, the fourth intermediate busbar 74 allows more battery cells 11 to be connected in series to the first battery string 20, thereby increasing the total voltage of the first battery string 20. The fifth intermediate busbar 75 allows more battery cells 11 to be connected in series to the second battery string 30, thereby increasing the total voltage of the second battery string 30.
[0079] Furthermore, the fourth intermediate busbar 74 is electrically connected to the solder strip located at the second end of the first sub-cell string 21 and the solder strip located at the first end of the second sub-cell string 22, respectively, to facilitate the extraction of the current collected by the solder strips. It is understood that the polarities of the second end of the first sub-cell string 21 and the first end of the second sub-cell string 22 are opposite. For example, the second end of the first sub-cell string 21 can be the positive terminal and the first end of the second sub-cell string 22 the negative terminal; alternatively, the second end of the first sub-cell string 21 can be the negative terminal and the first end of the second sub-cell string 22 the positive terminal.
[0080] Furthermore, the fifth intermediate busbar 75 is electrically connected to the solder strip located at the second end of the third sub-cell string 31 and the solder strip located at the first end of the fourth sub-cell string 32, respectively, to facilitate the extraction of the current collected by the solder strips. It is understood that the polarities of the second end of the third sub-cell string 31 and the first end of the fourth sub-cell string 32 are opposite. For example, the second end of the third sub-cell string 31 can be the positive terminal and the first end of the fourth sub-cell string 32 the negative terminal; alternatively, the second end of the third sub-cell string 31 can be the negative terminal and the first end of the fourth sub-cell string 32 the positive terminal.
[0081] like Figure 5 As shown, optionally, in some embodiments, the battery cell pack 100 further includes a sixth intermediate busbar 76; the first sub-cell string 21 and the second sub-cell string 22 are connected in series through the sixth intermediate busbar 76; the third sub-cell string 31 and the fourth sub-cell string 32 are connected in series through the sixth intermediate busbar 76.
[0082] It can be understood that the sixth intermediate busbar 76 can be located on the side or back of the battery cell 11 in the battery cell pack 100. In this way, multiple installation positions of the sixth intermediate busbar 76 are provided to adapt to more actual production scenarios.
[0083] Furthermore, the sixth intermediate busbar 76 can also be located on the back of the second intermediate busbar 72. The sixth intermediate busbar 76 allows both sets of two-string battery cells to be connected in series via it. This reduces the number of busbars in the cell pack 100, thereby reducing the manufacturing cost of the battery module 1001.
[0084] Furthermore, the sixth intermediate busbar 76 is electrically connected to the solder strip located at the second end of the first sub-cell string 21 and the solder strip located at the first end of the second sub-cell string 22, respectively, to facilitate the extraction of the current collected by the solder strips. It is understood that the polarities of the second end of the first sub-cell string 21 and the first end of the second sub-cell string 22 are opposite. For example, the second end of the first sub-cell string 21 can be the positive terminal and the first end of the second sub-cell string 22 the negative terminal; alternatively, the second end of the first sub-cell string 21 can be the negative terminal and the first end of the second sub-cell string 22 the positive terminal.
[0085] Simultaneously, the sixth intermediate busbar 76 is electrically connected to the solder strip located at the second end of the third sub-cell string 31 and the solder strip located at the first end of the fourth sub-cell string 32, respectively, facilitating the extraction of the current collected by the solder strips. It is understood that the polarities of the second end of the third sub-cell string 31 and the first end of the fourth sub-cell string 32 are opposite. For example, the second end of the third sub-cell string 31 can be the positive terminal and the first end of the fourth sub-cell string 32 the negative terminal; alternatively, the second end of the third sub-cell string 31 can be the negative terminal and the first end of the fourth sub-cell string 32 the positive terminal.
[0086] It is understandable that in the sixth intermediate busbar 76, the solder strips of the first sub-cell string 21 and the second sub-cell string are insulated from the solder strips of the third sub-cell string 31 and the fourth sub-cell string 32 by an insulating structure to prevent short-circuit loss of the cell 11.
[0087] Furthermore, it is understood that in such embodiments, the battery assembly 1001 may also include a frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled in the front and back of the battery cells 11 and between the photovoltaic glass, adjacent battery cells 11, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.
[0088] Photovoltaic glass can be applied to the encapsulating film on the front side of the solar cell 11. The photovoltaic glass can be ultra-clear glass, which has high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cell 11 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell 11 together, providing sealing, insulation, and waterproofing / moisture protection for the solar cell 11.
[0089] The backsheet can be attached to the adhesive film on the back of the solar cell 11. The backsheet protects and supports the solar cell 11, and has reliable insulation, water resistance, and aging resistance. Multiple options are available for the backsheet, typically tempered glass, acrylic glass, aluminum alloy TPT composite adhesive film, etc. The specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell 11, adhesive film, and photovoltaic glass can be integrated into a frame. The frame serves as the main external support structure for the entire solar module 1001, providing stable support and installation for the solar module 1001. For example, the solar module 1001 can be installed at the desired location via the frame.
[0090] like Figure 1 and Figure 2 As shown, the photovoltaic system 1000 of this application embodiment includes the aforementioned battery module 1001. In this embodiment, the photovoltaic system 1000 can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants, and can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, solar buildings, etc. Of course, it is understood that the application scenarios of the photovoltaic system 1000 are not limited to these; that is to say, the photovoltaic system 1000 can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules. For example, multiple battery modules may form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to realize solar power supply.
[0091] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0092] Furthermore, the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A battery cell pack, characterized in that, The battery cell assembly includes a first diode, a first battery string, and a second battery string, wherein the first diode is connected in parallel with the first battery string and the second battery string, respectively. The first end of the first battery string and the first end of the second battery string are both connected to the input terminal of the first diode, and the second end of the first battery string and the second end of the second battery string are both connected to the output terminal of the first diode; the first battery string and the second battery string each include 12 to 60 battery cells connected in series.
2. The battery cell pack according to claim 1, characterized in that, The battery cell array further includes a second diode, a third battery string, and a fourth battery string. The second diode is connected in parallel with the third battery string and the fourth battery string, respectively. The third battery string is connected in series with the first battery string, and the fourth battery string is connected in series with the second battery string. The first end of the third battery string and the first end of the fourth battery string are both connected to the input terminal of the second diode, and the second end of the third battery string and the second end of the fourth battery string are both connected to the output terminal of the second diode; the third battery string and the fourth battery string each include 3 to 30 battery cells connected in series.
3. The battery cell pack according to claim 2, characterized in that, The battery pack also includes a first junction box and a second junction box, wherein the first diode is housed in the first junction box and the second diode is housed in the second junction box.
4. The battery cell pack according to claim 2, characterized in that, The battery pack also includes a first intermediate busbar, a second intermediate busbar, and a third intermediate busbar; The first battery string and the second battery string are connected in parallel via the first intermediate busbar and the second intermediate busbar; The third battery string and the fourth battery string are connected in parallel through the second intermediate busbar and the third intermediate busbar.
5. The battery cell pack according to claim 4, characterized in that, The first battery string includes a first sub-battery string and a second sub-battery string; The second battery string includes a third battery string and a fourth battery string.
6. The battery cell pack according to claim 5, characterized in that, The battery pack also includes a fourth intermediate busbar and a fifth intermediate busbar; The first battery sub-string and the second battery sub-string are connected in series via the fourth intermediate busbar; The third and fourth battery sub-strings are connected in series via the fifth intermediate busbar.
7. The battery cell pack according to claim 5, characterized in that, The battery pack also includes a sixth intermediate busbar; The first battery sub-string and the second battery sub-string are connected in series via the sixth intermediate busbar; The third and fourth battery sub-strings are connected in series via the sixth intermediate busbar.
8. The battery cell pack according to claim 1, characterized in that, The voltage of the first battery string and the second battery string is 8V to 48V.
9. A battery assembly, characterized in that, The battery assembly includes a battery cell pack as described in any one of claims 1 to 8.
10. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 9.