Battery assembly and photovoltaic system

Abstract

The utility model is suitable for the technical field of solar cells, and provides a cell module and a photovoltaic system. A battery array of the battery assembly comprises a plurality of slice batteries, the slice batteries are formed by segmenting solar battery pieces, the boundary voltage of the slice batteries is smaller than or equal to 9V, the boundary voltage is the minimum voltage required by the reverse leakage current of the slice batteries exceeding the current value corresponding to the maximum power of the slice batteries, and all the slice batteries are connected in series. Therefore, the current of the battery array is relatively low, the loss caused by the resistor is relatively low, the voltage is relatively high, the shadow shielding resistance is relatively high, a diode does not need to be used for electric leakage protection, the diodes can be reduced or even omitted, the number of middle bus bars required for connecting the diodes is reduced, the number of junction boxes is reduced, and the cost is reduced. Moreover, a cable with a smaller diameter can be adopted, so that the cost is reduced.

Description

[0001] This application claims the priority of the Chinese patent application with application number 202420338928X and title “A battery assembly and photovoltaic system” filed with the China Patent Office on February 22, 2024, and claims the priority of the Chinese patent application with application number 2024102035155 and title “A battery assembly and photovoltaic system” filed with the China Patent Office on February 22, 2024, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of solar cells, and in particular to a battery assembly and a photovoltaic system. Background Art

[0003] Related technologies usually cut solar cells into sliced ​​cells, then connect the sliced ​​cells in series into multiple cell strings, and then connect the multiple cell strings in parallel to form a cell array in a battery assembly. However, in this way, the cell array has poor anti-shadow shading ability and high cost. Based on this, how to improve the anti-shadow shading ability of the cell array and reduce the cost has become an urgent problem to be solved. Utility Model Content

[0004] The present application provides a battery assembly and a photovoltaic system, aiming to solve the problem of how to improve the anti-shadowing capability of the battery array and reduce the cost.

[0005] The battery assembly provided in the present application, the battery array of the battery assembly includes a plurality of sliced ​​batteries, the sliced ​​batteries are formed by cutting solar cells, the sliced ​​batteries are batteries with a boundary voltage less than or equal to 9V, the boundary voltage is the minimum voltage required for the reverse leakage current of the sliced ​​batteries to exceed the current value corresponding to the maximum power of the sliced ​​batteries, and all the sliced ​​batteries are connected in series.

[0006] Specifically, the sliced ​​battery is a battery whose boundary voltage is less than or equal to 7V.

[0007] Specifically, the sliced ​​cell is formed by dividing the solar cell into two, three or four equal parts.

[0008] Specifically, in the battery array, the number of diodes is 0-2.

[0009] Specifically, in the battery array, the bus bars are all end bus bars.

[0010] Specifically, the ratio of the area covered by the sliced ​​battery to the total area of ​​the battery assembly is 0.93-0.99.

[0011] Specifically, the battery assembly includes a junction box, and the junction box is located at an end region of the battery assembly in a length direction.

[0012] Specifically, a ratio of a dimension of the end region in the length direction of the battery assembly to a length of the battery assembly is less than or equal to 1 / 3.

[0013] Specifically, the number of columns of the battery array extending along the length direction of the battery assembly is an even number, and the junction box is located at an end region in the length direction of the battery assembly;

[0014] Alternatively, the number of columns of the battery array extending in the length direction is an odd number, and the junction box comprises a first junction box and a second junction box, and the first junction box and the second junction box are respectively located at the two end regions in the length direction of the battery assembly.

[0015] Specifically, the battery assembly includes a junction box, which is located in an edge area of ​​the battery assembly, and the edge area surrounds a middle area of ​​the battery assembly.

[0016] Specifically, the edge region includes a first edge zone and a second edge zone connected to each other, the number of the first edge zones is 2, which are respectively located at the two ends of the width direction of the battery assembly, the first edge zone extends along the length direction of the battery assembly, and the ratio of the size of the first edge zone in the width direction of the battery assembly to the width of the battery assembly is less than or equal to 1 / 3; the number of the second edge zones is 2, which are respectively located at the two ends of the length direction of the battery assembly, the second edge zone extends along the width direction of the battery assembly, and the ratio of the size of the second edge zone in the length direction of the battery assembly to the length of the battery assembly is less than or equal to 1 / 3.

[0017] Specifically, the battery assembly includes a junction box, and the junction box is located in a corner area of ​​the battery assembly.

[0018] Specifically, the ratio of the dimension of the corner region in the length direction of the battery assembly to the length of the battery assembly is less than or equal to 1 / 3, and the ratio of the dimension of the corner region in the width direction of the battery assembly to the width of the battery assembly is less than or equal to 1 / 3.

[0019] Specifically, the battery assembly includes a bus bar, and the ratio of the area of ​​the bus bar located on the back side of the battery array to the total area of ​​the bus bar is 0.8-1.

[0020] Specifically, the battery assembly includes a junction box, and the ratio of the area of ​​the junction box located on the back side of the battery array to the total area of ​​the junction box is 0.8-1.

[0021] The photovoltaic system provided in the present application includes any one of the above-mentioned battery components.

[0022] In the battery assembly and photovoltaic system of the embodiment of the present application, since the boundary voltage of the sliced ​​battery is less than or equal to 9V and all the sliced ​​batteries are connected in series, the current of the battery array is low, so that the loss caused by resistance is low, and the voltage is high, so that the ability to resist shadowing is high, and there is no need to use diodes for leakage protection, which can reduce or even eliminate diodes, reduce the intermediate bus bars required to connect diodes, and reduce the number of junction boxes, thereby reducing costs. Moreover, since the voltage of the battery array is high and the current is low, cables with smaller diameters can be used, thereby reducing costs. This is conducive to improving the ability to resist shadowing and the photoelectric conversion efficiency of the battery array, and is conducive to reducing costs and hot spot risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a battery assembly according to an embodiment of the present application;

[0024] Figure 2 yes Figure 1 A schematic diagram of a circuit structure of a battery assembly;

[0025] Figure 3 is a schematic structural diagram of a battery assembly according to an embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram of a battery assembly according to an embodiment of the present application;

[0027] Figure 5 yes Figure 4 A schematic diagram of a circuit structure of a battery assembly;

[0028] Figure 6 is a schematic structural diagram of a battery assembly according to an embodiment of the present application;

[0029] Figure 7 yes Figure 6 A schematic diagram of a circuit structure of a battery assembly;

[0030] Figure 8 is a schematic structural diagram of a battery assembly according to an embodiment of the present application;

[0031] Fig. 9 is a schematic structural diagram of a battery assembly according to an embodiment of the present application;

[0032] Description of main component symbols:

[0033] The battery assembly 100 , the battery array 10 , the sliced ​​battery 11 , the end region 121 , the first edge region 1221 , the second edge region 1222 , the corner region 133 , and the junction box 14 . DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals 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 application, and should not be construed as limiting the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0035] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0040] In the present application, since the boundary voltage of the sliced ​​battery is less than or equal to 9V and all the sliced ​​batteries are connected in series, the current of the battery array is low, so that the loss caused by resistance is low. At the same time, the voltage is high, so that the ability to resist shadowing is high, and there is no need to use diodes for leakage protection, which can reduce or even eliminate diodes, reduce the intermediate bus bars required to connect diodes, and reduce the number of junction boxes, thereby reducing costs. Moreover, since the voltage of the battery array is high and the current is low, cables with smaller diameters can be used to reduce costs. This is conducive to improving the ability to resist shadowing and the photoelectric conversion efficiency of the battery array, and is conducive to reducing costs and hot spot risks.

[0041] Embodiment 1

[0042] See also Figure 1 and Figure 2 The battery assembly 100 of the embodiment of the present application, the battery array 10 of the battery assembly 100 includes a plurality of sliced ​​batteries 11, the sliced ​​batteries 11 are formed by cutting solar cells, the sliced ​​batteries 11 are batteries with a boundary voltage less than or equal to 9V, the boundary voltage is the minimum voltage required for the reverse leakage current of the sliced ​​battery 11 to exceed the current value (Impp) corresponding to the maximum power of the sliced ​​battery 11, and all the sliced ​​batteries 11 are connected in series.

[0043] In the battery assembly 100 of the embodiment of the present application, since the boundary voltage of the sliced ​​battery 11 is less than or equal to 9V and all the sliced ​​batteries 11 are connected in series, the current of the battery array 10 is relatively low, so that the loss caused by resistance is relatively low. At the same time, the voltage is relatively high, so that the ability to resist shadow shading is relatively high, and there is no need to use diodes for leakage protection, which can reduce or even eliminate diodes, reduce the intermediate bus bars required to connect diodes, and reduce the number of junction boxes 14, thereby reducing costs. Moreover, since the voltage of the battery array 10 is relatively high and the current is relatively low, cables with smaller diameters can be used, thereby reducing costs. This is conducive to improving the ability to resist shadow shading and the photoelectric conversion efficiency of the battery array 10, and is conducive to reducing costs and hot spot risks.

[0044] Specifically, the solar cell may be a double-sided contact cell, a back contact cell, a PERC cell, a HJT cell, a TopCon cell or other types of cells. The specific form of the solar cell is not limited here.

[0045] Specifically, the boundary voltage is the minimum voltage required for the reverse leakage current of the sliced ​​battery 11 to exceed the current value (Impp) corresponding to the maximum power of the sliced ​​battery 11. In other words, the voltage of the sliced ​​battery 11 needs to at least reach the boundary voltage before the reverse leakage current can exceed the current value (Impp) corresponding to the maximum power of the sliced ​​battery 11.

[0046] Specifically, the boundary voltage of the sliced ​​battery 11 is, for example, 9 V, 7 V, 5 V, 4 V, 1 V, or 0.5 V. The specific value of the boundary voltage is not limited here.

[0047] It can be understood that since the boundary voltage of the sliced ​​battery 11 is less than or equal to 9V, the sliced ​​battery 11 is a battery with high reverse leakage characteristics. A battery with high reverse leakage characteristics only needs a relatively small voltage to achieve a relatively large reverse leakage current. It can be understood that the horizontal axis is the reverse leakage capacity of the battery, and the vertical axis is the heat generation power. When the battery is blocked, as the reverse leakage capacity of the battery becomes stronger, the reverse leakage current increases, the voltage at both ends of the battery remains unchanged, and the heat generation power increases. When the reverse leakage current increases to the maximum current value (Impp), the heat generation power also increases to the maximum power value. As the reverse leakage capacity of the battery becomes stronger, the reverse leakage current remains unchanged at the maximum current value, but the voltage at both ends of the battery is reduced compared to the battery with worse reverse leakage capacity, resulting in a reduction in heat generation power compared to the battery with worse reverse leakage capacity. In other words, as the reverse leakage capacity of the battery becomes stronger, the reverse leakage current increases, and the heat generation power has a maximum value. When the maximum value is exceeded, the heat generation power will be reduced, thereby curbing the hot spot effect and improving the ability to resist shadow shielding. Moreover, when the reverse leakage current increases to the maximum current value, the voltage across the blocked battery has nothing to do with the number of batteries in series, but is limited by the reverse current-voltage characteristics of the battery itself. Therefore, the present application can connect more batteries in series to achieve that all the sliced ​​batteries 11 are connected in series, thereby reducing the current and reducing the loss caused by resistance.

[0048] Specifically, “all the sliced ​​batteries 11 are connected in series” means that all the sliced ​​batteries 11 in the battery assembly 100 are connected in series, and no sliced ​​battery 11 is connected in parallel.

[0049] It can be understood that since the sliced ​​battery 11 is made up of solar cells, the current of the sliced ​​battery 11 will be reduced to the ratio of the current of the solar cell to the number of cuts. All the sliced ​​batteries 11 are connected in series, so there is no parallel convergence, and there is no need to accumulate current. The current in the full series circuit is the ratio of the current of the solar cell to the number of cuts, and the voltage is the sum of the voltages at both ends of each sliced ​​battery 11. In this way, compared to using solar cells to form a battery array 10, the present application uses full series connection of sliced ​​batteries 11, which can achieve lower currents, thereby achieving less welding strips, bus bars, junction boxes 14, and cable resistance losses. Moreover, this can achieve higher voltages and improve shadow shielding capabilities.

[0050] In a comparative example, a total of 144 half-cells are used after being cut in half, and two battery strings are connected in parallel. Each battery string consists of 72 half-cell batteries connected in series to form a battery module. The reverse leakage characteristics of the half-cell batteries used are poor, and the reverse leakage current cannot reach Impp before the diode is activated. Each diode protects 24 cells. When a half-cell battery is blocked, the half-cell battery forms a state close to a short circuit, the diode is activated, and the power generation of the module is reduced by 33.3%.

[0051] In another comparative example, a total of 144 half-cells are used after being cut in half, and two battery strings are connected in parallel. Each battery string consists of 72 half-cell batteries connected in series to form a battery module. If the boundary voltage of the half-cell battery is 6V, when the voltage across the half-cell battery is 6V, the reverse leakage current of the half-cell battery reaches the current value corresponding to the maximum power (Impp). In this way, the module voltage is reduced by 6V, and the power loss of the module is 6V / (0.7V×72pcs)=11.9%, which is much lower than 33.3%, and plays a role in resisting shadow occlusion.

[0052] In another comparative example, a total of 72 solar cells that are not cut in half are used, all connected in series to form a battery module. If the boundary voltage of the solar cell is 6V, when the voltage across the solar cell is 6V, the reverse leakage current of the sliced ​​battery 11 reaches the current value (Impp) corresponding to the maximum power. In this way, the module voltage is reduced by 6V, and the power loss of the module is 6V / (0.7V×72pcs)=11.9%, and the anti-shadowing ability is the same as the previous comparative example. However, the resistance loss of electrical connectors such as welding strips, cables and bus bars increases to 4 times that of the previous comparative example, because the current of the battery after cutting in half will drop to 1 / 2 of the battery without cutting in half.

[0053] In an example of the present application, the solar cell is divided into two equal parts into sliced ​​cells 11, a total of 144pcs, and the 144pcs sliced ​​cells 11 are fully connected in series to form a battery assembly. If the boundary voltage of the sliced ​​cell 11 is 6V, when the voltage across the sliced ​​cell 11 is 6V, the reverse leakage current of the sliced ​​cell 11 reaches the current value (Impp) corresponding to the maximum power. In this way, the component voltage is reduced by 6V, and the component power generation power loss is 6V / (0.7V×144pcs)=5.95%. Compared with 11.9% of the first two comparative examples, the anti-shadow shading ability is doubled. When the area of ​​the battery assembly 100 remains unchanged, the power of the battery assembly 100 can be increased by 5.5W. Considering the premium of 0.007 yuan / W for every 1W increase in power, the profit is 0.019 yuan / W, the cost of the battery assembly 100 can be reduced by 0.015 yuan / W, the system segment cable cost can be reduced by 0.08 yuan / W, and the system operation and maintenance cost will also be reduced.

[0054] In addition, the sliced ​​cells 11 can be connected in series by providing welding strips (bus bars, interconnection bars), conductive back plates, etc.

[0055] It is understandable that the battery assembly 100 may also include a metal frame, a back plate, photovoltaic glass and an adhesive film. The adhesive film may be filled between the front and back of the sliced ​​battery 11 and the photovoltaic glass, between adjacent sliced ​​batteries 11, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the adhesive film may be an EVA adhesive film or a POE adhesive film, which may be selected according to actual conditions and is not limited here.

[0056] Photovoltaic glass can cover the adhesive film on the front of the sliced ​​battery 11. The photovoltaic glass can be ultra-white glass, which has high light transmittance, high transparency, and excellent physical, mechanical and optical properties. For example, the light transmittance of ultra-white glass can reach more than 92%, which can protect the sliced ​​battery 11 without affecting the efficiency of the sliced ​​battery 11 as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the sliced ​​battery 11 together, and the existence of the adhesive film can seal and insulate the sliced ​​battery 11 and make it waterproof and moisture-proof.

[0057] The backplane can be attached to the adhesive film on the back of the sliced ​​battery 11. The backplane can protect and support the sliced ​​battery 11, and has reliable insulation, water resistance and aging resistance. There are multiple options for the backplane, which can usually be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc. It can be set according to the specific situation and is not limited here. The whole composed of the backplane, sliced ​​battery 11, adhesive film and photovoltaic glass can be set on a metal frame. The metal frame serves as the main external support structure of the entire battery assembly 100, and can stably support and install the battery assembly 100. For example, the battery assembly 100 can be installed at the required installation position through the metal frame.

[0058] Embodiment 2

[0059] In some embodiments, the sliced ​​battery 11 is a battery with a boundary voltage less than or equal to 7V.

[0060] In this way, the boundary voltage is smaller, the reverse leakage characteristics of the sliced ​​battery 11 are better, and the voltage drop is smaller when blocked, so the power loss is smaller and the anti-blocking ability is better.

[0061] Embodiment 3

[0062] In some embodiments, the sliced ​​cell 11 is formed by dividing a solar cell into two, three, or four equal parts.

[0063] In this way, various forms of sliced ​​batteries 11 are provided, which is conducive to adapting to more actual production scenarios.

[0064] Preferably, the sliced ​​battery 11 is formed by dividing a solar cell into two equal parts, so as to ensure that the sliced ​​battery 11 is more in line with the voltage limit of the inverter and the arrangement is more flexible.

[0065] Specifically, the number of portions of all the sliced ​​batteries 11 is the same, so there is no need to match the sliced ​​batteries 11 formed by different numbers of portions, which is beneficial to improving the manufacturing efficiency of the battery assembly 100 and reducing the cost.

[0066] Embodiment 4

[0067] In some embodiments, in the battery array 10 , the number of diodes is 0-2, for example, 0, 1, or 2.

[0068] In this way, the number of diodes is within an appropriate range, and excessive costs caused by an excessive number of diodes can be avoided.

[0069] It can be understood that when there is no large obstruction in the use scenario of the photovoltaic module, the number of diodes can be 0. In this way, the cost can be reduced to the greatest extent. When there is a large obstruction in the use scenario of the photovoltaic module, the number of diodes can be 1. In this way, 1 diode can be used to protect the power generation and prevent excessive power generation loss. When there is a huge shadow in the use scenario of the photovoltaic module, the number of diodes can be 2. In this way, 2 diodes can be used to protect the power generation and prevent excessive power generation loss. Moreover, 2 diodes can be applicable to scenarios where there is no large obstruction, scenarios where there is a large obstruction or a huge obstruction, and are more universal.

[0070] It can be understood that in the related art, the diode of the battery assembly 100 is used to protect the power generation and reduce hot spots, but the diode of the battery assembly 100 in the present application only protects the power generation and does not need to reduce hot spots.

[0071] Specifically, a diode is connected in parallel with the sliced ​​battery 11 .

[0072] Embodiment 5

[0073] In some embodiments, in the battery array 10 , the bus bars are all end bus bars.

[0074] In this way, there is no bus bar in the middle of the battery array 10, and the middle bus bar can be omitted, thereby reducing costs. It can be understood that since all the sliced ​​batteries 11 are connected in series, there is no need for a middle bus bar to achieve parallel connection between battery strings, so the middle bus bar can be omitted, so that the bus bars of the battery array 10 are all end bus bars.

[0075] Specifically, the end bus bars are located at both ends of the battery array 10 in the length direction.

[0076] Embodiment 6

[0077] In some embodiments, the ratio of the area covered by the sliced ​​battery 11 to the total area of ​​the battery assembly 100 is 0.93-0.99, for example, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, or 0.99.

[0078] In this way, the sliced ​​battery 11 occupies a larger coverage area of ​​the battery assembly 100 , and the space utilization rate is higher, which is beneficial to reducing the cost of the battery assembly 100 and improving the photoelectric conversion efficiency of the battery assembly 100 .

[0079] Embodiment 7

[0080] See also Figure 1 and Figure 3 In some embodiments, the battery assembly 100 includes a junction box 14 , which is located at an end region 121 of the battery assembly 100 in the length direction.

[0081] In this way, it is convenient to connect cables between the battery assembly 100 and adjacent assemblies in the length direction, which can shorten the length of the cables and help reduce costs and resistance losses.

[0082] Specifically, there may be one or more junction boxes 14. When there are multiple junction boxes 14, all of the junction boxes 14 may be located in one end region 121 in the length direction of the battery assembly 100, or may be located in two end regions 121 in the length direction of the battery assembly 100.

[0083] Specifically, the end region 121 may be rectangular, arc-shaped, or in other shapes, which are not limited here.

[0084] Embodiment 8

[0085] See also Figure 3 In some embodiments, the ratio of the dimension L1 of the end region 121 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is less than or equal to 1 / 3, for example, 1 / 3, 1 / 4, 1 / 5, 1 / 6, or 1 / 7.

[0086] In this way, the position of the end region 121 in the length direction of the battery assembly 100 is within an appropriate range, which can avoid the end region 121 being too large, resulting in longer cables connected to other battery assemblies 100 and higher costs.

[0087] It can be understood that in the related art, the junction box 14 is placed in the middle area of ​​the battery assembly 100, because the middle bus bar is needed to connect the batteries on both sides in series and in parallel, and the diode is in the junction box 14. In the present application, all the sliced ​​batteries 11 are connected in series and do not need to be connected in parallel, so the junction box 14 can be set in the end area 121, which is closer to the components next to the battery assembly 100, and can save more cables between components, thereby reducing costs and reducing resistance losses.

[0088] Preferably, the ratio of the size of the end region 121 in the length direction of the battery assembly 100 to the length of the battery assembly 100 is less than or equal to 1 / 10. For example, it is 1 / 11, 1 / 12, 1 / 13, 1 / 14, 1 / 15. In this way, further optimizing the range of the end region 121 in the length direction of the battery assembly 100 can further reduce costs and reduce resistance losses.

[0089] Embodiment 9

[0090] See also Figure 1 , Figure 2 and Figure 3 In some embodiments, the number of columns of the battery array 10 extending along the length direction of the battery assembly 100 is an even number, and the junction box 14 is located at an end region 121 in the length direction of the battery assembly 100 .

[0091] In this way, the outlet ends of the sliced ​​batteries 11 at the head and the sliced ​​batteries 11 at the tail of the battery array 10 are located at the same end in the length direction of the battery assembly 100, so the junction box 14 can be set at this end to reduce the length of the cable connecting the junction box 14 and the outlet end, which is conducive to reducing costs and reducing resistance losses.

[0092] Specifically, the number of columns of the battery array 10 extending along the length direction of the battery assembly 100 is, for example, 6 columns.

[0093] See also Figure 3 , Figure 4 and Figure 5 In some embodiments, the number of columns of the battery array 10 extending along the length direction is an odd number, and the junction box 14 includes a first junction box and a second junction box, which are respectively located at two end regions 121 of the battery assembly 100 in the length direction.

[0094] In this way, the outlet ends of the sliced ​​batteries 11 at the head and the sliced ​​batteries 11 at the tail of the battery array 10 are located at the two ends in the length direction of the battery component 100, so the two junction boxes 14 can be respectively arranged at the two ends to avoid using cables to cross the components in the length direction, which is beneficial to reduce costs and reduce resistance losses.

[0095] Specifically, the number of columns of the battery array 10 extending along the length direction of the battery assembly 100 is, for example, 5 columns.

[0096] See also Figure 3 , Figure 6 and Figure 7 In some embodiments, the number of columns extending along the length direction of the battery array 10 is an odd number, and the junction box 14 is located at an end region 121 in the length direction of the battery assembly 100. In other words, the position of the lead-out terminal of the fully series-connected sliced ​​batteries 11 can be changed by the conductive cable, thereby changing the position of the junction box 14.

[0097] Embodiment 10

[0098] See also Figure 8 In some embodiments, the battery assembly 100 includes a junction box 14 , which is located in an edge region of the battery assembly 100 , and the edge region surrounds a middle region of the battery assembly 100 .

[0099] In this way, the distance between the junction box 14 and the surrounding components is made closer, which can reduce the cables required to connect the junction box 14 to the surrounding components, thereby helping to reduce costs and resistance losses.

[0100] Specifically, the boundary line between the peripheral area and the middle area may be rectangular, circular, elliptical or other shapes, which are not limited here.

[0101] Embodiment 11

[0102] See also Figure 8 In some embodiments, the edge region includes a first edge region 1221 and a second edge region 1222 connected to each other. The number of the first edge regions 1221 is 2, which are respectively located at the two ends of the width direction of the battery assembly 100. The first edge regions 1221 extend along the length direction of the battery assembly 100. The ratio of the size W1 of the first edge region 1221 in the width direction of the battery assembly 100 to the width W0 of the battery assembly 100 is less than or equal to 1 / 3; the number of the second edge regions 1222 is 2, which are respectively located at the two ends of the length direction of the battery assembly 100. The second edge regions 1222 extend along the width direction of the battery assembly 100. The ratio of the size L2 of the second edge region 1222 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is less than or equal to 1 / 3.

[0103] In this way, the edge area is positioned within an appropriate range in the battery assembly 100 , which can avoid the situation where the edge area is too large, resulting in longer cables connected to other battery assemblies 100 and higher costs.

[0104] Specifically, a ratio of a dimension W1 of the first edge region 1221 in the width direction of the battery assembly 100 to a width W0 of the battery assembly 100 is 1 / 3, 1 / 4, 1 / 5, 1 / 6, or 1 / 7.

[0105] Preferably, the ratio of the dimension W1 of the first edge region 1221 in the width direction of the battery assembly 100 to the width W0 of the battery assembly 100 is less than or equal to 1 / 10. For example, it is 1 / 11, 1 / 12, 1 / 13, 1 / 14, 1 / 15. In this way, further optimizing the range of the edge region can further reduce costs and reduce resistance losses.

[0106] Specifically, the ratio of the dimension L2 of the second edge area 1222 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is 1 / 3, 1 / 4, 1 / 5, 1 / 6, or 1 / 7.

[0107] Preferably, the ratio of the dimension L2 of the second edge region 1222 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is less than or equal to 1 / 10. For example, it is 1 / 11, 1 / 12, 1 / 13, 1 / 14, 1 / 15. In this way, further optimizing the range of the edge region can further reduce costs and reduce resistance losses.

[0108] Embodiment 12

[0109] See also Fig. 9 In some embodiments, the battery assembly 100 includes a junction box 14 , which is located in a corner area 133 of the battery assembly 100 .

[0110] In this way, the outlet end of the sliced ​​battery 11 is closer to the junction box 14, and the junction box 14 is closer to the adjacent components, which can reduce the length of the cable between the junction box 14 and the outlet end of the sliced ​​battery 11, and also reduce the length of the cable between the junction box 14 and the adjacent components, which is beneficial to reduce costs and reduce resistance losses.

[0111] Specifically, the corner area 133 may be rectangular, circular, elliptical or other shapes, which are not limited here.

[0112] Specifically, the number of the corner regions 133 may be one or more.

[0113] In this embodiment, the number of corner regions 133 is four.

[0114] Embodiment 13

[0115] See also Fig. 9 In some embodiments, the ratio of the dimension L3 of the corner region 133 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is less than or equal to 1 / 3, and the ratio of the dimension W2 of the corner region 133 in the width direction of the battery assembly 100 to the width W0 of the battery assembly 100 is less than or equal to 1 / 3.

[0116] In this way, the corner area 133 is positioned within an appropriate range in the battery assembly 100 , which can avoid the corner area 133 being too large, which would result in longer cables and higher costs.

[0117] Specifically, the ratio of the dimension L3 of the corner region 133 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is 1 / 3, 1 / 4, 1 / 5, 1 / 6, or 1 / 7.

[0118] Preferably, the ratio of the dimension L3 of the corner region 133 in the length direction of the battery assembly 100 to the length L0 of the battery assembly 100 is less than or equal to 1 / 4. For example, it is 1 / 5, 1 / 6, or 1 / 7. In this way, further optimizing the range of the corner region 133 can further reduce costs and reduce resistance losses.

[0119] Specifically, a ratio of a dimension W2 of the corner region 133 in the width direction of the battery assembly 100 to a width W0 of the battery assembly 100 is 1 / 3, 1 / 4, 1 / 5, 1 / 6, or 1 / 7.

[0120] Preferably, the ratio of the dimension W2 of the corner region 133 in the width direction of the battery assembly 100 to the width W0 of the battery assembly 100 is less than or equal to 1 / 4. For example, it is 1 / 5, 1 / 6, or 1 / 7. In this way, further optimizing the range of the corner region 133 can further reduce costs and reduce resistance losses.

[0121] It can be understood that the outgoing wire ends of the sliced ​​battery 11 at the head and the outgoing wire ends of the sliced ​​battery 11 at the tail are both located in the corner area 133, so the cable required to set the junction box 14 in the corner area 133 is shorter. It can be understood that when the number of columns of the battery array 10 extending along the length direction of the battery assembly 100 is an even number, the outgoing wire ends of the sliced ​​battery 11 at the head and the outgoing wire ends of the sliced ​​battery 11 at the tail are respectively located in two corresponding corner areas 133 in the width direction. When the number of columns of the battery array 10 extending along the length direction of the battery assembly 100 is an odd number, the outgoing wire ends of the sliced ​​battery 11 at the head and the outgoing wire ends of the sliced ​​battery 11 at the tail are respectively located in two corresponding corner areas 133 in the diagonal direction.

[0122] Embodiment 14

[0123] In some embodiments, the battery assembly 100 includes a bus bar, and the ratio of the area of ​​the bus bar located at the back of the battery array 10 to the total area of ​​the bus bar is 0.8-1, for example, 0.8, 0.82, 0.85, 0.9, 0.95, 0.98, or 1.

[0124] In this way, most or even all of the bus bars are located on the back of the battery array 10, which will not block the light incident from the front of the battery array 10, which is beneficial to improving the photoelectric conversion efficiency and at the same time makes the color integrity of the front of the battery assembly 100 better and the visual effect better.

[0125] Embodiment 15

[0126] In some embodiments, the battery assembly 100 includes a junction box 14, and the ratio of the area of ​​the junction box 14 located at the back of the battery array 10 to the total area of ​​the junction box 14 is 0.8-1, for example, 0.8, 0.82, 0.85, 0.9, 0.95, 0.98, or 1.

[0127] In this way, most or even all of the junction box 14 is located on the back of the battery array 10, which will not block the light incident from the front of the battery array 10, which is beneficial to improving the photoelectric conversion efficiency and at the same time makes the color integrity of the front of the battery assembly 100 better and the visual effect better.

[0128] Embodiment 16

[0129] The photovoltaic system of the embodiment of the present application includes the battery assembly 100 of any one of the first to fifteenth embodiments.

[0130] In the photovoltaic system of the embodiment of the present application, since the boundary voltage of the sliced ​​battery 11 is less than or equal to 9V and all the sliced ​​batteries 11 are connected in series, the current of the battery array 10 is relatively low, so that the loss caused by resistance is relatively low. At the same time, the voltage is relatively high, so that the ability to resist shadow shading is relatively high, and there is no need to use diodes for leakage protection, which can reduce or even eliminate diodes, reduce the intermediate bus bars required to connect diodes, and reduce the number of junction boxes 14, thereby reducing costs. Moreover, since the voltage of the battery array 10 is relatively high and the current is relatively low, cables with smaller diameters can be used, thereby reducing costs. This is conducive to improving the ability to resist shadow shading and the photoelectric conversion efficiency of the battery array 10, and is conducive to reducing costs and hot spot risks.

[0131] In this embodiment, the photovoltaic system can be applied to photovoltaic power stations, such as ground power stations, rooftop power stations, water 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 may be an array combination of multiple battery assemblies 100. For example, multiple battery assemblies 100 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 and is converted into the alternating current required by the mains power grid and then connected to the mains network to realize solar power supply.

[0132] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0133] In addition, the above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery assembly, characterized in that: The battery array of the battery assembly includes a plurality of sliced ​​batteries, wherein the sliced ​​batteries are formed by cutting solar cells, and the sliced ​​batteries are batteries with a boundary voltage less than or equal to 9V, and the boundary voltage is the minimum voltage required for the reverse leakage current of the sliced ​​batteries to exceed the current value corresponding to the maximum power of the sliced ​​batteries, and all the sliced ​​batteries are connected in series.

2. The battery assembly according to claim 1, characterized in that: The sliced ​​battery is a battery whose boundary voltage is less than or equal to 7V.

3. The battery assembly according to claim 1, characterized in that: The sliced ​​cell is formed by dividing the solar cell into two, three or four equal parts.

4. The battery assembly according to claim 1, characterized in that: In the battery array, the number of diodes is 0-2.

5. The battery assembly according to claim 1, characterized in that: In the battery array, the bus bars are all end bus bars.

6. The battery assembly according to claim 1, characterized in that: The ratio of the area covered by the sliced ​​battery to the total area of ​​the battery assembly is 0.93-0.

99.

7. The battery assembly according to claim 1, characterized in that: The battery assembly includes a junction box, and the junction box is located at an end region of the battery assembly in a length direction.

8. The battery assembly according to claim 7, characterized in that: A ratio of a dimension of the end region in the length direction of the battery assembly to a length of the battery assembly is less than or equal to 1 / 3.

9. The battery assembly according to claim 7, characterized in that: The number of columns of the battery array extending along the length direction of the battery assembly is an even number, and the junction box is located at an end region of the battery assembly in the length direction; Alternatively, the number of columns of the battery array extending in the length direction is an odd number, and the junction box comprises a first junction box and a second junction box, and the first junction box and the second junction box are respectively located at the two end regions in the length direction of the battery assembly.

10. The battery assembly according to claim 1, characterized in that: The battery assembly includes a junction box, which is located in an edge area of ​​the battery assembly, and the edge area surrounds a middle area of ​​the battery assembly.

11. The battery assembly according to claim 10, characterized in that: The edge region includes a first edge region and a second edge region connected to each other, wherein the number of the first edge regions is 2 and they are respectively located at the two ends of the width direction of the battery assembly, the first edge region extends along the length direction of the battery assembly, and the ratio of the size of the first edge region in the width direction of the battery assembly to the width of the battery assembly is less than or equal to 1 / 3; the number of the second edge regions is 2 and they are respectively located at the two ends of the length direction of the battery assembly, the second edge region extends along the width direction of the battery assembly, and the ratio of the size of the second edge region in the length direction of the battery assembly to the length of the battery assembly is less than or equal to 1 / 3.

12. The battery assembly according to claim 1, characterized in that: The battery assembly includes a junction box located in a corner area of ​​the battery assembly.

13. The battery assembly according to claim 12, characterized in that: The ratio of the dimension of the corner region in the length direction of the battery assembly to the length of the battery assembly is less than or equal to 1 / 3, and the ratio of the dimension of the corner region in the width direction of the battery assembly to the width of the battery assembly is less than or equal to 1 / 3.

14. The battery assembly according to claim 1, characterized in that: The battery assembly includes a bus bar, and a ratio of an area of ​​a portion of the bus bar located on the back side of the battery array to a total area of ​​the bus bar is 0.8-1.

15. The battery assembly according to claim 1, characterized in that: The battery assembly includes a junction box, and the ratio of the area of ​​the junction box located on the back side of the battery array to the total area of ​​the junction box is 0.8-1.

16. A photovoltaic system, characterized in that: A battery assembly comprising any one of claims 1-15.

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