A sliced battery, a monolithic battery, a battery assembly and a photovoltaic system

Abstract

The application is suitable for the technical field of solar cells, and provides a sliced cell, a whole-cell, a cell assembly and a photovoltaic system. The sliced cell comprises two opposite surfaces and a cutting surface connecting the two surfaces, at least one surface is provided with a plurality of openings, the openings are arranged near the cutting surface and along the connecting edge of the surface and the cutting surface, and the inner side of the openings is provided with a first passivation layer. In this way, since the inner side of the plurality of openings arranged along the cutting surface on the surface of the cell is provided with the passivation layer, the passivation of the cutting surface can be enhanced, the recombination of carriers is reduced, the life of the carriers is prolonged, and thus the photoelectric conversion efficiency is improved.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and particularly relates to a sliced ​​cell, a whole cell, a cell module and a photovoltaic system. Background Technology

[0002] Solar cell power generation is a sustainable and clean energy source that uses the photovoltaic effect to convert sunlight into electricity.

[0003] In traditional cell slicing methods, the finished cell is usually cut into smaller slices. The dangling single bonds on the cut surface will form recombination centers, resulting in severe electron-hole recombination and reduced carrier lifetime. Ultimately, this leads to a significant decrease in the photoelectric conversion efficiency of the slicing.

[0004] Therefore, how to reduce the photoelectric conversion efficiency loss of the cut surface of the sliced ​​battery has become an urgent problem to be solved. Utility Model Content

[0005] This application provides a sliced ​​cell, a whole cell, a cell module, and a photovoltaic system, aiming to solve the problem of how to reduce the photoelectric conversion efficiency loss of the sliced ​​cell's cut surface.

[0006] This application provides a sliced ​​battery, including two opposing surfaces and a cut surface connecting the two surfaces. At least one of the surfaces is provided with a plurality of openings, which are close to the cut surface and arranged along the connection edge between the cut surface and the surface. The inner side of the opening is provided with a first passivation layer.

[0007] Furthermore, the opening includes a slot, the projection of which onto the surface is notched.

[0008] Furthermore, the opening includes an aperture, the projection of which onto the surface is closed.

[0009] Furthermore, the number of openings is multiple, and they are evenly distributed along the connecting edge.

[0010] Furthermore, the opening includes a bottom surface, and the inner side surface extends from the edge of the bottom surface.

[0011] Furthermore, the surface is provided with a plurality of passivation holes, the passivation holes being located on the side of the opening away from the connecting edge, and the inner side of the passivation holes being provided with a second passivation layer.

[0012] Furthermore, the openings and the passivation holes are arranged alternately along the connecting edge.

[0013] Furthermore, the projection of the first passivation layer onto the projection plane is a first projection, the projection of the second passivation layer onto the projection plane is a second projection, the first projection and the second projection are tangent, or the first projection and the second projection at least partially overlap, and the projection plane is a plane perpendicular to the surface and parallel to the extension direction of the connecting edge.

[0014] Furthermore, a gap is formed between two adjacent openings, the length of which is less than the length of the opening.

[0015] Furthermore, the passivation holes are provided correspondingly to the spacers.

[0016] This application provides a whole battery cell comprising a plurality of battery sections, at least one of which is a sliced ​​battery cell as described in any of the above claims.

[0017] This application provides a battery assembly comprising any of the sliced ​​batteries described above.

[0018] The sliced ​​battery of this application has a passivation layer on the inner side of a plurality of openings arranged along the cut surface on the battery surface. This can enhance the passivation of the cut surface, reduce carrier recombination, extend carrier lifetime, and thus improve photoelectric conversion efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first structure of a sliced ​​battery according to an embodiment of this application; Figure 2 This is a schematic diagram of a second structure of a sliced ​​battery according to an embodiment of this application; Figure 3 This is a schematic diagram of a third structure of a sliced ​​battery according to an embodiment of this application; Figure 4 This is a schematic diagram of the fourth structure of a sliced ​​battery according to an embodiment of this application; Figure 5 yes Figure 4 Enlarged view of a portion of point M in the middle; Figure 6 This is a schematic diagram of a fifth structure of a sliced ​​battery according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a whole battery cell according to an embodiment of this application; Figure 8 This is a schematic diagram of a segmented battery stacking method according to an embodiment of this application. Figure 1 ; Figure 9 This is a schematic diagram of a segmented battery stacking method according to an embodiment of this application. Figure 2 .

[0020] Key component symbols: 100 - sliced ​​battery, 10 - surface, 11 - opening, 111 - first passivation layer, 12 - passivation hole, 121 - second passivation layer, 13 - spacer, 14 - cut surface, 15 - connecting edge; 200 - Full cell battery. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] The sliced ​​battery of this application has a passivation layer on the inner side of several openings arranged along the cut surface on the battery surface, which can enhance the passivation of the cut surface, reduce carrier recombination, extend carrier lifetime, and thus improve photoelectric conversion efficiency.

[0028] Please see Figure 1 The sliced ​​battery 100 of this application embodiment includes two opposing surfaces 10 and a cutting surface 14 connecting the two surfaces 10. At least one surface 10 is provided with a plurality of openings 11. The openings 11 are close to the cutting surface 14 and arranged along the connecting edge 15 between the cutting surface 14 and the surface 10. The inner side of the opening 11 is provided with a first passivation layer 111.

[0029] The sliced ​​battery 100 of this application embodiment has a first passivation layer 111 on the inner side of a plurality of openings 11 arranged along the cut surface 14 on the surface 10. This can enhance the passivation of the cut surface 14, reduce carrier recombination, extend carrier lifetime, and thus improve the photoelectric conversion efficiency of the sliced ​​battery 100.

[0030] It is understood that the cutting surface 14 in the embodiments of this application refers to the plane where the actual cutting path is located when the whole battery 200 is cut to obtain the sliced ​​battery 100. It can be a continuous plane or a discontinuous plane.

[0031] Specifically, the sliced ​​battery 100 can be formed by dividing the whole battery 200 into two, three, four, or other proportions, resulting in different numbers of cut surfaces 14 in the sliced ​​battery 100. For example, if the whole battery 200 is divided into two equal parts, then the two sliced ​​batteries 100 will each have one cut surface 14. Or, if the whole battery 200 is divided into three equal parts, then two of the sliced ​​batteries 100 will each have one cut surface 14, and the remaining sliced ​​battery 100 will have two cut surfaces. This application does not limit the specific division ratio of the whole battery 200 into the sliced ​​batteries 100.

[0032] For ease of understanding, this article uses the sliced ​​battery 100 as an example of a half-cell battery for explanation and illustration. In this case, the sliced ​​battery 100 has a cut surface 14 that connects the two surfaces 10.

[0033] Specifically, the opening 11 can be located on either of the two surfaces 10, or it can be located on both surfaces 10 simultaneously. When the opening 11 is located on both surfaces 10 simultaneously, the openings 11 on the two surfaces 10 can be distributed relatively to each other or staggered. No limitation is made here.

[0034] Specifically, the number of openings 11 can be 1, 2, 3, 4, 5, 6, 8, 9, 10, 15, 16, 18, 30, 32, 36, or other quantities, and can be adjusted according to the actual specifications and dimensions. No limitation is made here.

[0035] Specifically, the connecting edge 15 between the cutting surface 14 and the surface 10 can be a continuous line segment or a discontinuous line segment; it can be a straight line segment or a non-straight line segment. No limitation is made here.

[0036] Specifically, the opening 11 extends from one surface 10 to another surface 10, forming a plurality of inner surfaces. The inner surfaces may be perpendicular to the surface 10 or not. No limitation is made here.

[0037] Specifically, all openings 11 may be provided with a first passivation layer 111, or only some openings 11 may be provided with a first passivation layer 111. Simultaneously, the inner surface of each opening 11 may be entirely provided with a first passivation layer 111, or only partially provided with a first passivation layer 111. In this way, the purpose of enhancing the passivation effect of the edge where the cutting surface 14 is located can be achieved. No limitation is made here.

[0038] Specifically, the thickness of the first passivation layer 111 is 10nm-200nm. For example, it can be 10nm, 15nm, 20nm, 25nm, 30nm, 35nm, 40nm, 45nm, 50nm, 55nm, 60nm, 65nm, 70nm, 75nm, 80nm, 90nm, 95nm, 100nm, 105nm, 110nm, 115nm, 120nm, 125nm, 130nm, 135nm, 145nm, 150nm, 155nm, 160nm, 165nm, 170nm, 180nm, 185nm, 190nm, 195nm, or 200nm. This allows for efficient passivation of the inner surface of the opening 11, reducing edge recombination and further improving conversion efficiency. It is understandable that when the passivation thickness is less than 10nm, there may be localized gaps in the coverage, resulting in recombination centers in the passivation layer and leading to poor passivation performance. When the passivation thickness is greater than 200nm, internal stress may be generated in the passivation layer, making it prone to peeling and increasing the difficulty of the process.

[0039] Please note that the thickness of the first passivation layer 111 can be the same everywhere, or the thickness can be different everywhere, or the thickness can be the same in some areas and different from the thickness in other areas.

[0040] Specifically, the first passivation layer 111 includes at least one of aluminum oxide, silicon nitride, silicon oxide, and silicon oxynitride. Thus, the first passivation layer 111 has a good passivation effect, reducing edge recombination at the cut surface 14.

[0041] Please see Figure 1 , Figure 2 In some embodiments, the opening 11 may include a slot, the projection of which onto the surface 10 is notched.

[0042] Thus, since the inner side of the slot is provided with a first passivation layer 111, the passivation effect of the edge where the cutting surface 14 is located is enhanced, thereby reducing the recombination of charge carriers, extending the lifetime of charge carriers, and improving the photoelectric conversion efficiency.

[0043] Specifically, there are multiple slots, and the center point of each slot is located on the straight line of the connecting edge 15. This reduces stress concentration at the edge of the cut surface 14 and enhances the structural strength of the edge.

[0044] Specifically, all the slots are evenly spaced along the connecting edge 15. This reduces stress concentration at the edge where the cut surface 14 is located and enhances the structural strength of the edge.

[0045] Specifically, the spacing between adjacent slots is half the length of the slot along the connecting edge 15. Note that this spacing is the edge spacing. This balances edge strength and passivation effect.

[0046] Specifically, the projection of the slot can be in the shape of an arc-shaped notch, such as a semi-circular notch, a semi-elliptical notch, or a U-shaped or C-shaped notch with other curvatures. In this way, the arc-shaped notch can reduce the impact of stress concentration on the structural strength of the battery. In other embodiments, the slot can also be formed on the surface 10 with other notch shapes such as acute angles, right angles, or obtuse angles.

[0047] Specifically, the arc-shaped notch protrudes into the battery. In this way, the first passivation layer 111 provided on the inner side can block the multi-directional carrier movement paths (or channels), and the blocking effect is good.

[0048] exist Figure 1 In the example, the slot is a semi-circular through slot, and a first passivation layer 111 is provided on the inner side. The center of the semi-circular through slot is evenly distributed on the connecting edge 15. All slots are evenly distributed at intervals along the connecting edge 15, and the spacing between the slots is the radius of the semi-circular through slot.

[0049] Thus, the passivation area in the entire cut surface 14 exceeds two-thirds of the entire cut surface 14, enhancing the passivation effect of the cut surface 14. At the same time, the arc shape of the inner side of the semi-circular through groove protrudes into the battery. The first passivation layer 111 provided on the inner side can block the carrier movement path (channel) in the near 180° direction, with a good blocking effect.

[0050] exist Figure 2 In the example, the slot is a semi-elliptical through slot, and a first passivation layer 111 is provided on the inner side. The center point of the semi-elliptical through slot is evenly distributed on the connecting edge 15. All slots are evenly distributed at intervals along the connecting edge 15. The distance between adjacent slots is the length of the minor axis of the semi-elliptical through slot, and the length of the major axis of the semi-elliptical through slot is 2-5 times the length of the minor axis.

[0051] This further increases the proportion of the passivation area in the entire cut surface 14, thereby further enhancing the passivation effect of the cut surface 14.

[0052] Please see Figure 3 In some embodiments, the opening 11 includes a hole positioned as close as possible to the cut surface 14, and the projection of the hole onto the surface 10 is closed. For example, the projection of the hole can be circular, elliptical, or any other closed shape with an arc transition. This reduces the impact of stress concentration caused by the hole on the strength of the battery structure. In other embodiments, the hole may also have a closed projection with sharp corners on the surface.

[0053] Specifically, a first passivation layer 111 is provided on the inner side of the opening, and the opening is positioned as close as possible to the cut surface 14. In this way, even if the cut surface 14 itself is not passivated and has a high density of recombination centers, the first passivation layer 111 can block or repel carrier movement, reduce the movement of carriers towards the edge of the cut surface 14 which has a high risk of recombination, thereby reducing carrier recombination, extending carrier lifetime, and improving photoelectric conversion efficiency.

[0054] Please note that the settings for the opening, the inner surface of the opening, and the first passivation layer 111 on the inner surface can all be set in accordance with the settings for the slot described above, and will not be repeated here. In some other embodiments, different settings may also be made. No limitation is made here.

[0055] Please see Figure 1 , Figure 2 or Figure 3 In some embodiments, there are multiple openings 11, which are evenly distributed along the extending direction of the connecting edge 15. For example, the center-to-center distance between adjacent openings 11 can be used as the spacing, and they are evenly distributed along the connecting edge 15. This can reduce stress concentration at the edge of the battery where the cut surface 14 is located, and ensure the edge strength of the battery. In some embodiments, the openings 11 may also be non-equally spaced. This is not limited here.

[0056] Please see Figure 1 , Figure 2 , Figure 3 In some embodiments, the opening 11 includes a bottom surface (not shown), and an inner surface extends from the edge of the bottom surface. That is, the opening 11 does not penetrate both surfaces 10, making the slot a blind slot or the opening a blind hole. In this case, the opening 11 can be provided from both surfaces 10 to the other surface 10 simultaneously.

[0057] Thus, the presence of the bottom surface can compensate for the impact of the opening 11 on the structural strength of the sliced ​​battery 100 to a certain extent, reduce the risk of microcracks in the battery cell caused by the opening, or even the battery cell breakage, and help improve the mechanical reliability of the sliced ​​battery 100 in subsequent transportation and use.

[0058] Specifically, the opening 11 includes the bottom surface. In this case, the two surfaces 10 can have openings 11 simultaneously, or only one surface 10 can have an opening 11. When both surfaces 10 have openings 11, the openings 11 on the two surfaces 10 can be arranged opposite each other or staggered. That is, the projections of the openings on the two surfaces 10 onto the surfaces can overlap, partially overlap, or not overlap. No limitation is made here.

[0059] Specifically, a passivation layer identical to the first passivation layer 111 may be provided on the bottom surface, or a passivation layer different from the first passivation layer 111 may be provided, or no passivation layer may be provided. The thickness, area, and presence or absence of the passivation layer on the bottom surface are not limited here.

[0060] Please see Figure 4 , Figure 5 , Figure 6 In some embodiments, the surface 10 is also provided with a plurality of passivation holes 12, the passivation holes 12 being located on the side of the opening 11 away from the connecting edge 15, and the inner side of the passivation holes 12 being provided with a second passivation layer 121.

[0061] Thus, the opening 11 and the passivation hole 12 have a first passivation layer 111 and a second passivation layer 121, respectively, which further enhances the passivation effect of the edge where the cutting surface 14 is located.

[0062] Specifically, the thickness of the second passivation layer 121 is 10nm-200nm. For example, it can be 10nm, 15nm, 20nm, 25nm, 30nm, 35nm, 40nm, 45nm, 50nm, 55nm, 60nm, 65nm, 70nm, 75nm, 80nm, 95nm, 100nm, 105nm, 110nm, 115nm, 120nm, 125nm, 130nm, 135nm, 145nm, 150nm, 155nm, 160nm, 165nm, 170nm, 180nm, 185nm, 190nm, 195nm, or 200nm. This allows for efficient passivation of the inner surface of the passivation hole 12, reducing edge recombination and further improving conversion efficiency.

[0063] Please note that the thickness of the second passivation layer 121 can be the same everywhere, or the thickness can be different everywhere, or the thickness can be the same in some areas and different from the thickness in other areas. The thickness setting of the second passivation layer 121 can be the same as or different from the first passivation layer 111. No limitation is made here.

[0064] Please see Figure 4 , Figure 5 , Figure 6 In some embodiments, the opening 11 and the passivation hole 12 can be arranged alternately along the connecting edge 15. Alternatively, they can be arranged non-alternatingly along the connecting edge 15. The corresponding first passivation layer 111 and second passivation layer 121 can be arranged alternately along the connecting edge 15, or they can be arranged non-alternatingly along the connecting edge 15. No limitation is made here. This further enhances the passivation effect of the cut surface 14.

[0065] Specifically, the opening 11 and the passivation hole 12 can be arranged alternately along the connecting edge 15, or they can be arranged non-alternatingly along the connecting edge 15. The corresponding first passivation layer 111 and second passivation layer 121 can be arranged alternately along the connecting edge 15, or they can be arranged non-alternatingly along the connecting edge 15. No limitation is made here.

[0066] In some other embodiments, the openings 11 and the passivation holes 12 may be arranged at equal intervals along the connecting edge 15. Alternatively, they may be arranged at unequal intervals. For example, the interval may be the distance between the center points of adjacent openings 11 or adjacent passivation holes 12, or the distance between the edges of adjacent openings 11 or adjacent passivation holes 12. No limitation is imposed here.

[0067] Please see Figure 4 , Figure 5 , Figure 6 In some embodiments, the projection of the first passivation layer 111 onto the projection plane is a first projection, and the projection of the second passivation layer 121 onto the projection plane is a second projection. The first projection and the second projection are tangent, or the first projection and the second projection at least partially overlap. The projection plane is a plane perpendicular to the surface 10 and parallel to the extension direction of the connecting edge 15.

[0068] In this way, the path of photogenerated carriers to the entire edge of the cut surface 14 is blocked by the passivation layer (first passivation layer 111 and second passivation layer 121), thereby minimizing edge recombination of the cut surface 14 and improving photoelectric conversion efficiency.

[0069] It is understood that when the projection of the passivation hole 12 onto the projection plane is sufficient to cover the projection of the corresponding spacer 13 onto the projection plane, the passivation hole 12 can provide sufficient supplementary blocking of the carrier recombination path. Therefore, under normal circumstances, the length of the passivation hole 12 can be less than or equal to the length of the opening 11. In some other embodiments, the length of the passivation hole 12 can also be greater than the length of the opening 11. This is not limited here.

[0070] Thus, the sliced ​​battery 100 of this application embodiment has a first passivation layer 111 on the inner side of a plurality of openings 11 arranged along the cut surface 14 on the surface 10 of the battery, passivation holes 12 are correspondingly provided in the intervals between the openings 11, and a second passivation layer 121 is provided on the inner side of the passivation holes 12. Through the cooperation of the first passivation layer 111 and the second passivation layer 121, the passivation effect of the cut surface 14 is further enhanced, the recombination of charge carriers is further reduced, and the photoelectric conversion efficiency is further improved.

[0071] Please see Figure 4 , Figure 5In some embodiments, a spacer 13 is formed between two adjacent openings 11, and the length of the spacer 13 is less than the length of the opening 11. Both the length of the spacer 13 and the length of the opening 11 refer to the straight line along the connecting edge 15. This increases the effective passivation density of the openings 11 at the edge where the cutting surface 14 is located, thereby improving the passivation effect. In other embodiments, the length of the spacer 13 may also be greater than or equal to the length of the opening 11.

[0072] Please see Figure 4 , Figure 5 , Figure 6 In some embodiments, the passivation hole 12 is correspondingly provided with the spacer portion 13. In this way, the corresponding provision of the passivation hole 12 and the spacer portion 13 can be used to supplement the part that the opening 11 fails to isolate, and effectively supplement the isolation effect on the path of photogenerated carriers flowing to the edge of the cut surface 14, further reducing edge recombination on the cut surface 14 and improving photoelectric conversion efficiency.

[0073] exist Figure 4 In the example, the opening can be a circular opening (not shown) or an elliptical opening. A passivation hole 12 is provided on the side of the opening away from the connecting edge 15. The shape of the passivation hole 12 can be consistent with a circle or an ellipse, using the corresponding circular or elliptical hole shapes to simplify the opening process. Of course, other shapes can also be used. No limitation is made here.

[0074] exist Figure 6 In the example, the slot can be a semi-circular through slot (not shown) or a semi-elliptical through slot. A passivation hole 12 is provided on the side of the slot away from the connecting edge 15. The shape of the passivation hole 12 can be consistent with the semi-circular or semi-elliptical shape, using the corresponding circular or elliptical hole shapes to simplify the hole-making and slotting process. Of course, other shapes can also be used. No limitation is made here.

[0075] Specifically, the opening 11 and the passivation hole 12 are alternately and evenly distributed along the connecting edge 15, such that the projections of the first passivation layer 111 of the opening 11 and the second passivation layer 121 of the passivation hole 12 overlap on the projection plane. In this way, the path of photogenerated carriers to the entire edge of the cut surface 14 is almost blocked by the passivation layer, thereby minimizing edge recombination of the cut surface 14 and improving the photoelectric conversion efficiency.

[0076] It is understood that the first passivation layer 111 covers the portion of the surface 10 that is in contact with the opening 11. The first passivation layer 111 covers the inner side and extends to the portion of the surface 10 that is in contact with the opening 11. The extent to which the first passivation layer 111 extends and covers the surface 10 is not limited, as long as the transition between the opening 11 and the surface 10 is satisfied.

[0077] Thus, the structural strength of the first passivation layer 111 is enhanced, reducing the risk of peeling. Similarly, the second passivation layer 121 can also cover the portion of the surface 10 that is in contact with the passivation hole 12. The second passivation layer 121 can adopt the same configuration as the first passivation layer 111; the specific configuration and effects will not be elaborated further. In some other embodiments, the configuration of the second passivation layer 121 may differ from that of the first passivation layer 111, which is not limited here.

[0078] Please see Figure 7 The whole battery 200 of this application embodiment includes a plurality of battery sections, at least one of which is a sliced ​​battery 100 of any of the above.

[0079] It should be noted that, for manufacturing cost considerations, the whole battery 200 in this application embodiment may include several identical sliced ​​batteries 100. The sliced ​​batteries 100 are connected by a cutting portion (in this application embodiment, it is actually the portion including the cutting surface 14 and the cutting loss).

[0080] It is understood that the opening 11 in the sliced ​​battery 100 of this application embodiment is actually pre-drilled during the silicon wafer stage in the manufacturing process of the entire battery 200. The first passivation layer 111 and the second passivation layer 121 are also passivated during the manufacturing process of the entire battery 200. Thus, when the entire battery 200 is cut into sliced ​​batteries 100, it is only necessary to slice along the cutting portion (also called the cutting groove) where the cutting surface 14 is located to obtain sliced ​​batteries 100 with preset passivation layers.

[0081] Specifically, in the embodiments of this application, during the silicon wafer stage of the production process, the whole battery 200 is provided with pre-passivation slots near the cutting part, that is, the upper opening 11 and passivation holes 12 are symmetrically distributed on both sides of the cutting part.

[0082] Thus, in the subsequent manufacturing process of the entire battery 200, the inner side of the opening 11 is provided with a first passivation layer 111 through the original passivation process, and the inner side of the passivation hole 12 is provided with a second passivation layer 121. After the entire battery 200 is produced, it is only necessary to slice it along the cutting part where the cutting surface 14 is located to obtain the sliced ​​battery 100 with the preset passivation layer.

[0083] After the pre-passivated slotted cell 200 is cut into sliced ​​cells 100, the number of cut surfaces 14 that do not require secondary passivation treatment or the area that requires secondary passivation treatment is greatly reduced, thereby reducing manufacturing costs.

[0084] It is understood that, depending on the number, shape, and position of the openings 11 and the passivation holes 12, the sliced ​​battery 100 of any of the above embodiments in this application can be obtained.

[0085] The battery assembly of this application embodiment includes the sliced ​​battery 100 described above.

[0086] In this embodiment, multiple sliced ​​cells 100 in the battery assembly can be connected in series to form a battery string, thereby realizing the series current collection and output. For example, the battery cells can be connected in series by setting solder strips (busbars, interconnecting strips), conductive backplates, etc.

[0087] It should be noted that, since the sliced ​​battery 100 of this application embodiment has an opening 11 on one side of the cut surface 14, there is a problem that affects the aesthetics or may affect the stability of the component structure. When connecting the battery cells in series, they can be connected in series by stacking and welding.

[0088] Specifically, please refer to Figure 8 , Figure 9 The straight edge of an adjacent slice battery 100 overlaps the cutting edge of the cutting surface 14 of another slice battery 100, with the overlap limited to the area covered by the opening 11. This ensures both the regularity of the battery string's appearance and its structural strength. In some other embodiments, other overlap ranges may also be provided. No limitations are imposed here.

[0089] It is understood that in such embodiments, the battery assembly may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back of the solar cells, the photovoltaic glass, and adjacent cells. 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.

[0090] Photovoltaic glass can be applied to the encapsulating film on the front of solar cells. This photovoltaic glass can be ultra-clear glass, characterized by 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 cells while minimizing impact on their efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cells together, providing sealing, insulation, and waterproofing / moisture protection for the solar cells.

[0091] The backsheet can be attached to the encapsulating film on the back of the solar cell. The backsheet protects and supports the solar cell, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite encapsulating film, etc., depending on the specific circumstances and not limited here. The backsheet, solar cell, encapsulating film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire battery module, providing stable support and installation. For example, the battery module can be installed at the desired location using the metal frame.

[0092] The beneficial effects of the battery assembly in this embodiment are equivalent to those of the sliced ​​battery 100 described above, and will not be repeated here.

[0093] The photovoltaic system of this application embodiment includes the battery module described above.

[0094] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0095] The beneficial effects of the photovoltaic system in this embodiment are equivalent to the beneficial effects of the battery module described above, and will not be repeated here.

[0096] 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.

[0097] Furthermore, the above are merely preferred embodiments of this application and are 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 scope of protection of this application.

Claims

1. A sliced ​​battery, characterized in that, It includes two opposing surfaces and a cut surface connecting the two surfaces. At least one of the surfaces is provided with a plurality of openings. The openings are close to the cut surface and arranged along the connection edge between the cut surface and the surface. The inner side of the opening is provided with a first passivation layer.

2. The sliced ​​battery according to claim 1, characterized in that, The opening includes a slot, the projection of which on the surface is notched.

3. The sliced ​​battery according to claim 1, characterized in that, The opening includes an aperture, the projection of which onto the surface is closed.

4. The sliced ​​battery according to claim 1, characterized in that, The number of openings is multiple, and they are evenly distributed along the connecting edge.

5. The sliced ​​battery according to claim 1, characterized in that, The opening includes a bottom surface, and the inner side surface extends from the edge of the bottom surface.

6. The sliced ​​battery according to claim 1, characterized in that, The surface is provided with a plurality of passivation holes, the passivation holes are located on the side of the opening away from the connecting edge, and the inner side of the passivation holes is provided with a second passivation layer.

7. The sliced ​​battery according to claim 6, characterized in that, The openings and the passivation holes are arranged alternately along the connecting edge.

8. The sliced ​​battery according to claim 6, characterized in that, The projection of the first passivation layer onto the projection plane is the first projection, and the projection of the second passivation layer onto the projection plane is the second projection. The first projection and the second projection are tangent, or the first projection and the second projection at least partially overlap. The projection plane is a plane perpendicular to the surface and parallel to the extension direction of the connecting edge.

9. The sliced ​​battery according to claim 6, characterized in that, A gap is formed between two adjacent openings, and the length of the gap is less than the length of the opening.

10. The sliced ​​battery according to claim 9, characterized in that, The passivation holes are provided corresponding to the spacers.

11. A single-cell battery, characterized in that, It includes several battery sections, at least one of which is a sliced ​​battery as described in any one of claims 1-10.

12. A battery assembly, characterized in that, Includes the sliced ​​battery as described in any one of claims 1-10.

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