Busbar-less back-contact batteries, battery assemblies, and photovoltaic systems

Abstract

This application is applicable to the field of solar cells and provides a busbar-less back-contact battery (100), a battery assembly, and a photovoltaic power generation system. The busbar-less back-contact battery (100) includes a battery substrate (10), a first insulating member (21), and a conductive member, wherein two types of alternatingly distributed fingers of polarity are formed on the back surface of the battery substrate (10), and the back surface includes alternatingly distributed current-collecting regions (13) and non-current-collecting regions (14), with a portion of each finger located in the current-collecting region (13) and the remaining portion of each finger located in the non-current-collecting region (14); the current-collecting region (13) includes an interconnector electrical connection region (101), the first insulating member (21) is provided in the current-collecting region (13) and covers the fingers of opposite polarity to the current-collecting region (13) and exposes the interconnector electrical connection region (101); and the conductive member is provided in the interconnector electrical connection region (101).

Description

[Technical Field]

[0001] (Cross-reference of related applications) This application claims priority to the Chinese patent application filed with the Chinese National Intellectual Property Office on 22 May 2023, application number 2023105806174, titled "Busbar-less back-contact battery, battery assembly and photovoltaic power generation system," the entirety of which is incorporated herein by reference.

[0002] This application relates to the technology of solar cells, and more specifically to busbar-less back-contact batteries, battery assemblies, and photovoltaic power generation systems. [Background technology]

[0003] Solar cell power generation is a sustainable and clean energy source that can convert sunlight into electrical energy by utilizing the photovoltaic effect of a semiconductor pn junction.

[0004] In busbar-less back-contact solar cells, which are related technologies, two types of polarity fingers are distributed alternately. When current is collected to the fingers using an interconnector, the fingers are prone to short circuits because they easily conduct to interconnectors of the opposite polarity. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Reducing the risk of short circuits in busbar-less back-contact batteries is an urgent issue that needs to be addressed. [Means for solving the problem]

[0006] This application provides a busbar-less back-contact battery, a battery assembly, and a photovoltaic power generation system to solve the problem of how to reduce the risk of short circuits in busbar-less back-contact batteries.

[0007] A busbar-less back-contact battery provided by this application comprises a battery substrate, a first insulating member, and a conductive member, wherein two types of alternatingly distributed fingers of polarity are formed on the back surface of the battery substrate, and the back surface comprises alternatingly distributed current-collecting and non-current-collecting regions, with a portion of each finger located in the current-collecting region and the remaining portion of each finger located in the non-current-collecting region; the current-collecting region includes an interconnector electrical connection region, the first insulating member is provided in the current-collecting region and covers the fingers of opposite polarity to the current-collecting region and exposes the interconnector electrical connection region; and the conductive member is provided in the interconnector electrical connection region.

[0008] The thickness of the first insulating member is arbitrarily 10 μm to 50 μm.

[0009] The length of the first insulating member is arbitrarily 1 mm to 3 mm.

[0010] The width of the first insulating member is optionally 0.2 mm to 0.6 mm.

[0011] The height of the conductive member is arbitrarily 30 μm to 100 μm.

[0012] Optionally, the area of ​​the interconnect electrical connection region is 0.02 mm². 2 ~0.6mm 2 That is the case.

[0013] The number of electrical connection areas in the interconnector can be arbitrarily between 1,000 and 4,000.

[0014] Optionally, the busbar-less back-contact type battery includes a second insulating member, the second insulating member connecting two adjacent first insulating members and surrounding the interconnector electrical connection area together with the adjacent first insulating members.

[0015] The width of the second insulating member is arbitrarily 1 mm to 3 mm.

[0016] Optionally, the first insulating member is a transparent insulating member.

[0017] Optionally, the first insulating member is a transparent fluorescent insulating member.

[0018] Optionally, the transparent fluorescent insulating member is made of a transparent insulating adhesive, and the transparent insulating adhesive comprises a resin component of 60% to 80% by mass, an inorganic filler of 5% to 15% by mass, a curing agent of 5% to 15% by mass, a solvent of less than 10% by mass, and a fluorescent agent of 0.1% or more and less than 1% by mass.

[0019] Optionally, the fluorescent agent includes at least one of fluorescent whitening agent OB-1, fluorescent whitening agent -OB, aluminum oxide, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent materials, fluorescent whitening agent BC, fluorescent whitening agent JD-3, fluorescent whitening agent BR, fluorescent whitening agent -EBF, fluorescent whitening agent R, fluorescent whitening agent ER, 1,8-naphthalimide-based fluorescent compounds, polyphenyls, polythiophenes, polyfluorenes, polytriphenylamines, polytriphenylamine derivatives, polycarbazoles, polypyrroles, polyporphyrins and their derivatives, copolymers, N,N-dimethylaminobenzal dinitrile compounds, aluminum 8-hydroxyquinoline, europium metal complexes.

[0020] The battery assembly provided by this application includes the busbarless back-contact type battery according to any one of the above items.

[0021] The photovoltaic power generation system provided by this application includes the above-mentioned battery assembly.

Advantages of the Invention

[0022] In the busbarless back-contact type battery, battery assembly, and solar power generation system according to the embodiments of the present application, a first insulating member is provided in the current collection region to cover fingers with the opposite polarity to the current collection region, so that conduction between fingers with opposite polarities and welding ribbons in the current collection region can be avoided, thereby reducing the short-circuit risk of the busbarless back-contact type battery. At the same time, since the conductive member is provided in the electrical connection region, it becomes easier to connect fingers with the same polarity to the interconnector. Thereby, the interconnector connects the busbarless back-contact type batteries in series to form a battery string and conducts the current of the busbarless back-contact type battery. Moreover, since there is no busbar, the slurry for the busbar can be saved, and the cost can be reduced.

Brief Description of the Drawings

[0023] [Figure 1] It is a schematic diagram of the structure of a partial region of a busbarless back-contact type battery according to an embodiment of the present application. [Figure 2] It is a schematic diagram of the structure of a battery substrate of a busbarless back-contact type battery according to an embodiment of the present application. [Figure 3] It is a schematic diagram of a partial structure of a busbarless back-contact type battery according to an embodiment of the present application. [Figure 4] It is a schematic diagram of a partial structure of a busbarless back-contact type battery according to an embodiment of the present application. [Figure 5] It is a schematic diagram of the structure of a partial region of a busbarless back-contact type battery according to an embodiment of the present application.

[0024] Description of the main element symbols: Busbarless back-contact type battery 100, battery substrate 10, interconnector electrical connection region 101, non-interconnector electrical connection region 102, first finger 111, first interconnector electrical connection region 1120, second finger 121, second interconnector electrical connection region 1220, current collection region 13, non-current collection region 14, first insulating member 21, second insulating member 22, conductive member 30. [Modes for carrying out the invention]

[0025] To further clarify the purpose, technical solutions, and advantages of this application, the application will be described in more detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, and the same or similar reference numerals throughout the drawings represent the same or similar elements, or elements having the same or similar functions. The following embodiments described with reference to the accompanying drawings are illustrative and used solely for the purpose of illustrating this application, but should not be understood as limiting this application. It should also be understood that the specific embodiments described herein are for interpretation purposes only, but not limiting purposes.

[0026] In the description of this application, directions or positional relationships indicated by terms such as "length," "width," "top," "bottom," "left," "right," "horizontal," "top," and "bottom" are directions or positional relationships shown based on the drawings and are merely for the purpose of easily explaining and simplifying the description of this application. It should be understood that these do not indicate or imply that the shown devices or elements necessarily have a specific direction or are constructed and operated in a specific direction, and therefore should not be understood as limiting this application.

[0027] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly representing the number of technical features described. Thus, features defined as “first” and “second” may explicitly or implicitly include one or more of the aforementioned features. In this description, unless otherwise clearly defined, “multiple” means two or more.

[0028] In the description of this application, unless otherwise explicitly defined and limited, the terms “attached,” “connected,” and “connected” should be understood in a broad sense, for example, whether fixed, detachable, or integral; mechanical, electrical, or intercommunicative; directly connected, indirectly connected via an intermediate medium, internal communication between two elements, or interaction between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0029] In this application, unless otherwise explicitly defined and limited, the positioning of a first feature "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or it may include the first feature not being directly connected to the second feature but being in contact via another feature between them. Furthermore, the positioning of a first feature "above," "above," and "on the top surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or simply indicating that the horizontal height of the first feature is greater than that of the second feature. The positioning of a first feature "below," "below," and "on the bottom surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0030] The following disclosure provides many different embodiments or examples for realizing different structures of this application. For the sake of brevity of the disclosure, the components and installations of specific examples are described below. Naturally, these are examples only and are not intended to limit this application. Furthermore, this application may use the same reference numerals and / or letters in different embodiments, and such duplication is intended for simplification and clarity and does not, in itself, indicate relationships between the various embodiments and / or installations discussed. Furthermore, while this application provides examples of various specific processes and materials, those skilled in the art will be able to infer the applications of other processes and / or usage scenarios of other materials.

[0031] In this application, the first insulating member is provided in the current collection area and covers the fingers with opposite polarity to the current collection area, thereby preventing electrical contact between the fingers with opposite polarity in the current collection area and the weld ribbon, and thereby reducing the risk of short circuits in busbar-less back-contact type batteries. At the same time, since the conductive member is provided in the electrical connection area, it becomes easy to connect fingers with the same polarity to the interconnector, so that the interconnector connects busbar-less back-contact type batteries in series to a battery string and derives the current from the busbar-less back-contact type batteries. Moreover, because there are no busbars, the slurry for busbars is omitted and costs can be reduced.

[0032] Example 1 Referring to Figures 1, 2, 3, 4, and 5, the busbar-less back-contact type battery 100 of the embodiment of this application includes a battery substrate 10, a first insulating member 21, and a conductive member, wherein two types of alternatingly distributed fingers of polarity are formed on the back surface of the battery substrate 10, and the back surface includes alternatingly distributed current-collecting regions 13 and non-current-collecting regions 14, with a portion of each finger located in the current-collecting region 13 and the remaining portion of each finger located in the non-current-collecting region 14; the current-collecting region 13 includes an interconnector electrical connection region 101, the first insulating member 21 is provided in the current-collecting region 13 and covers the current-collecting region 13 and the fingers of opposite polarity, exposing the interconnector electrical connection region 101; and the conductive member is provided in the interconnector electrical connection region 101.

[0033] In the busbar-less back-contact type battery 100 of the embodiment of this application, the first insulating member 21 is provided in the current collection area 13 and covers the fingers with opposite polarity to the current collection area 13. This prevents electrical conductivity between the fingers with opposite polarity in the current collection area 13 and the welding ribbon, thereby reducing the risk of short circuits in the busbar-less back-contact type battery 100. At the same time, since the conductive member is provided in the electrical connection area, it becomes easy to connect fingers with the same polarity to the interconnector. As a result, the interconnector connects the busbar-less back-contact type battery 100 in series to the battery string and derives the current from the busbar-less back-contact type battery 100. Moreover, because there are no busbars, the slurry for busbars can be omitted, reducing costs.

[0034] At the same time, when multiple busbar-less back-contact type batteries 100 are stacked, the first insulating member 21 prevents fingers from damaging other busbar-less back-contact type batteries 100 in the area covered by the first insulating member 21. Moreover, because the first insulating member 21 has a certain thickness, a gap can be formed between the area not covered by the first insulating member 21 and other busbar-less back-contact type batteries 100, thereby preventing fingers from damaging other busbar-less back-contact type batteries 100 in the area not covered by the first insulating member 21. In this way, when busbar-less back-contact type batteries 100 are stacked, damage to the busbar-less back-contact type batteries 100 can be reduced, the separator paper provided between two adjacent busbar-less back-contact type batteries 100 can be eliminated, and the transportation or storage costs of the busbar-less back-contact type batteries 100 are reduced.

[0035] Optionally, the busbar-less back-contact battery 100 may be a single whole battery sheet, or it may be half a battery sheet, a third of a battery sheet, or other proportions of battery sheets divided from a single whole battery sheet. To make the drawings clearer, the busbar-less back-contact battery 100 shown in Figures 1, 2, 3, and 4 is two divided sheet regions of a busbar-less back-contact battery 100 which is a single whole five-divided sheet.

[0036] The configuration of the remaining area of ​​the busbar-less back-contact type battery 100, which has 5 partitioned sheets, and the configuration of the busbar-less back-contact type battery 100 with other partitioned sheet proportions are similar to those in Figures 1, 2, 3, and 4, so you can refer to Figures 1, 2, 3, and 4, and a detailed explanation is omitted here. Figure 5 shows a partial area of ​​the busbar-less back-contact type battery 100, but the other areas of the busbar-less back-contact type battery 100 are similar to those in Figure 5, so you can refer to Figure 5, and a detailed explanation is omitted here. In other words, the drawings are only examples and do not limit the specific configuration of the busbar-less back-contact type battery 100.

[0037] Optionally, two types of fingers with alternating polarities are formed on the back surface of the battery substrate 10, which are designated as the first finger 111 and the second finger 121.

[0038] Optionally, the battery substrate 10 includes a front and back surface facing each other, with the front surface facing the sun and receiving mainly direct sunlight, and the back surface facing the mounting surface of the battery assembly and receiving mainly sunlight reflected from the mounting surface such as the ground or roof. Alternatively, the back surface is the surface on which the grid lines of the busbar-less back-contact type battery 100 are provided.

[0039] Optionally, alternating distribution means that one second finger 121 is placed between two adjacent first fingers 111, and one first finger 111 is placed between two adjacent second fingers 121. Optionally, one of the first fingers 111 and the second fingers 121 is a positive electrode finger, and the other is a negative electrode finger.

[0040] Optionally, the reverse side includes alternatingly distributed current-collecting regions 13 and non-current-collecting regions 14. In other words, one non-current-collecting region 14 is formed between two adjacent current-collecting regions 13, and one current-collecting region 13 is formed between two adjacent non-current-collecting regions 14.

[0041] Optionally, the arrangement direction of the alternating distribution of the current-collecting area 13 and the non-current-collecting area 14 is perpendicular to the arrangement direction of the alternating distribution of the first finger 111 and the second finger 121. In other embodiments, the arrangement direction of the alternating distribution of the current-collecting area 13 and the non-current-collecting area 14 may be at an angle to the arrangement direction of the alternating distribution of the first finger 111 and the second finger 121, and should be understood that this specification is not limited to such embodiments.

[0042] The polarity of the current collection region 13 can be arbitrarily divided into two types: a first current collection region and a second current collection region, which are distributed alternately. In other words, one second current collection region is formed between two adjacent first current collection regions, and one first current collection region is formed between two adjacent second current collection regions. Arbitrarily, one of the first and second current collection regions is a positive current collection region and the other is a negative current collection region.

[0043] It should be noted that the current collection areas 13, which have two types of polarity, are alternately distributed in the longitudinal direction of the finger, and in the width direction of the finger, they can form one or more rows of delimiter sheet areas, each row of delimiter sheet area including current collection areas 13 and non-current collection areas 14 that are alternately distributed in the longitudinal direction of the finger. The busbar-less back-contact type battery 100 may include insulating strips to cover the fingers located at the boundary between two adjacent battery areas.

[0044] This allows for the reduction of the current in a single battery sheet using the partitioned sheet technology, thereby reducing power loss after the same battery sheet is packaged in a photovoltaic assembly and improving the efficiency of the assembly. It should be understood that after partitioning, the current in a single battery sheet is reduced, thus reducing heat loss, and the increased resistance reduces transmission loss. In this embodiment, the busbar-less back-contact battery is a 5-partitioned sheet battery. In other embodiments, the busbar-less back-contact battery may be a 2-partitioned sheet battery, a 3-partitioned sheet battery, a 4-partitioned sheet battery, or a 6-partitioned sheet battery, and should be understood that this specification does not limit them.

[0045] Optionally, busbar-less back-contact batteries are 3-section sheet batteries and 4-section sheet batteries. This results in a smaller increase in disconnection losses, a significant reduction in power loss per single battery sheet, lower process complexity, the highest overall efficiency, and optimal power.

[0046] Optionally, the arrangement direction of the alternating distribution of the first and second current collection regions is perpendicular to the arrangement direction of the alternating distribution of the first finger 111 and the second finger 121. In other embodiments, the arrangement direction of the alternating distribution of the first and second current collection regions may be at an angle to the arrangement direction of the alternating distribution of the first finger 111 and the second finger 121, and should be understood that this is not limited herein.

[0047] Optionally, the first and second current collection regions are used to provide the first and second interconnectors, respectively. That is, fingers of the same polarity are current-collected by interconnectors of the same polarity.

[0048] Optionally, the current collection area 13 includes an interconnector electrical connection area 101. The interconnector is electrically connected to a busbar-less back-contact type battery 100 in the interconnector electrical connection area 101 and is connected in series with other busbar-less back-contact type batteries 100 to form a battery string.

[0049] Optionally, the interconnect electrical connection area 101 includes a first interconnect electrical connection area 1120 and a second interconnect electrical connection area 1220, which have opposite polarities. The polarity of the first interconnect electrical connection area 1120 is the same as the polarity of the first finger 111, and the polarity of the second interconnect electrical connection area 1220 is the same as the polarity of the second finger 121.

[0050] Optionally, the interconnector electrical connection area 101 exposes fingers of two different polarities, but the first insulating member 21 is provided in the current collection area 13 and covers the fingers with opposite polarity to the current collection area 13. In this way, electrical conductivity between the fingers with opposite polarity and the welding ribbon can be avoided in the current collection area 13, thereby reducing the risk of short circuits in the busbar-less back-contact type battery 100.

[0051] Optionally, the non-interconnector electrical connection area 102 is located in an area of ​​the battery substrate 10 other than the interconnector electrical connection area 101. In other words, the non-interconnector electrical connection area 102 includes the area of ​​the current collection area 13 other than the interconnector electrical connection area 101 and the non-current collection area 14.

[0052] In some optional embodiments, the interconnector electrical connection region 101 includes at least one of a pad region, a conductive adhesive region, and an electronic paste region. In other words, the interconnector electrical connection region 101 includes at least one or more of a pad region, a conductive adhesive region, and an electronic slurry region.

[0053] Thus, the busbar-less back-contact type battery 100 and the interconnector may be connected by at least one of pad welding, conductive adhesive, or electronic slurry.

[0054] Optionally, a conductive material may be provided in the pad area. The conductive material is, for example, solder paste.

[0055] Optionally, a conductive adhesive may be provided in the conductive adhesive area.

[0056] Optionally, the interconnector may be, for example, a welding ribbon, conductive wire, conductive tape, conductive sheet, or conductive plate. In this specification, the interconnector is described as a welding ribbon as an example, but this is not limited to the interconnector.

[0057] Optionally, interconnectors have two types of polarity, and current is collected from fingers of the same polarity.

[0058] Referring to Figures 1, 2, 3, and 4, the first insulating member 21 is provided in the current collection area 13, covers the fingers with opposite polarity to the current collection area 13, and exposes the interconnect electrical connection area 101; the conductive member is provided in the interconnect electrical connection area 101.

[0059] Optionally, the first insulating member 21 covers the second finger 121 in the first current collection area, exposing the interconnect electrical connection area 101 of the first current collection area; and the first insulating member 21 covers the first finger 111 in the second current collection area, exposing the interconnect electrical connection area 101 of the second current collection area.

[0060] Optionally, the first insulating member 21 completely covers the finger with the opposite polarity to the current collection area 13 within the current collection area 13. In other words, the finger with the opposite polarity to the current collection area 13 is completely covered by the first insulating member 21 in that portion of the current collection area 13. In this way, the finger with the opposite polarity is isolated from the serial connector as much as possible.

[0061] Optionally, one or both ends of the first insulating member 21 may extend from the current-collecting area 13 to the non-current-collecting area 14 along the longitudinal direction of the corresponding finger. In this way, the risk of electrical contact with a finger of opposite polarity can be reduced if the interconnect is misaligned.

[0062] Optionally, the conductive member partially covers the interconnect electrical connection area 101. "Partially covering" means that the conductive member covers only a portion of the interconnect electrical connection area 101, rather than the entire area. This smaller coverage area is advantageous for cost reduction.

[0063] In other embodiments, it should be understood that the conductive member can completely cover the interconnect electrical connection area 101. Optionally, "completely cover" means that the conductive member covers the entire interconnect electrical connection area 101. This is advantageous for improving manufacturing efficiency because the installation process of the conductive member is simpler.

[0064] The center of the conductive member is arbitrarily positioned to coincide with the center of the interconnect electrical connection area 101. In this way, because the conductive member is located in the center of the interconnect electrical connection area 101, the connection between the interconnect and the busbar-less back-contact type battery 100 becomes more stable.

[0065] Optionally, the conductive member is a conductive adhesive, which is fixed to the interconnect electrical connection area 101 after curing. The conductive member may be provided by being bonded to the interconnect electrical connection area 101 with an adhesive. The conductive member may also be formed by welding and solidifying solder. The method of installing the conductive member to the interconnect electrical connection area 101 is not limited herein.

[0066] Optionally, the interconnector electrical connection area 101 is rectangular. In other embodiments, it should be understood that the interconnector electrical connection area 101 may be circular, square, triangular, or of other shape. The specific form of the interconnector electrical connection area 101 is not limited herein.

[0067] Optionally, the contact surface between the conductive member and the interconnector electrical connection area 101 is rectangular. In other embodiments, it should be understood that the contact surface between the conductive member and the interconnector electrical connection area 101 may be circular, square, triangular, or other shapes. The specific form of the contact surface between the conductive member and the interconnector electrical connection area 101 is not limited herein.

[0068] Optionally, the configuration of the interconnect electrical connection area 101 may be the same as or different from the configuration of the contact surface between the conductive member and the interconnect electrical connection area 101.

[0069] Example 2 In several optional embodiments, the thickness of the first insulating member 21 is 10 μm to 50 μm. For example, the thickness of the first insulating member 21 is 10 μm, 12 μm, 15 μm, 17 μm, 20 μm, 25 μm, 28 μm, 30 μm, 35 μm, 40 μm, 42 μm, 45 μm, 49 μm, and 50 μm.

[0070] Thus, because the thickness of the first insulating member 21 is within an appropriate range, it is possible to avoid deterioration of the insulating effect due to being too thin, and also to avoid material waste and increased costs due to being too thick.

[0071] The thickness of the first insulating member 21 is optionally 20 μm to 30 μm. This configuration provides the greatest overall effect in insulation and energy saving.

[0072] It should be noted that the thickness of the first insulating member 21 may be a constant value within the range of 10 μm to 50 μm, or it may vary within the range of 10 μm to 50 μm.

[0073] Example 3 Referring to Figure 5, in several arbitrary embodiments, the length d of the first insulating member 21 is 1 mm to 3 mm. The lengths of the first insulating member 21 are, for example, 1 mm, 1.1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.9 mm, and 3 mm.

[0074] Thus, because the length of the first insulating member 21 is within an appropriate range, it is possible to avoid the impossibility of completely covering the fingers of different polarities in the current collection area 13 and the deterioration of the insulating effect due to the length being too short, and it is also possible to avoid material waste and increased costs due to the length being too long.

[0075] Optionally, the length d of the first insulating member 21 is 1.5 mm to 2.5 mm. This configuration provides the greatest overall effect in insulation and energy saving.

[0076] It should be noted that the length of the first insulating member 21 may be a constant value within the range of 1.5 mm to 2.5 mm, or it may vary within the range of 1.5 mm to 2.5 mm.

[0077] Example 4 In some optional embodiments, the width w of the first insulating member 21 is 0.2 mm to 0.6 mm. For example, the width w of the first insulating member 21 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm.

[0078] Thus, because the width w of the first insulating member 21 is within an appropriate range, it is possible to avoid the inability to cover the fingers and the deterioration of the insulating effect due to a width that is too narrow, and it is also possible to avoid material waste and increased costs due to a width that is too wide.

[0079] Optionally, the width w of the first insulating member 21 is 0.4 mm. This configuration provides the greatest overall effect in insulation and energy saving.

[0080] It should be noted that the width w of the first insulating member 21 may be a constant value within the range of 0.2 mm to 0.6 mm, or it may be uneven within the range of 0.2 mm to 0.6 mm.

[0081] Example 5 In several arbitrary embodiments, the height of the conductive member is 30 μm to 100 μm. For example, the height of the conductive member is 30 μm, 32 μm, 35 μm, 40 μm, 60 μm, 70 μm, 90 μm, 95 μm, and 100 μm.

[0082] In this way, because the height of the conductive component is within an appropriate range, it is possible to avoid difficulties in connecting to the interconnect due to its height being too low, and also to avoid material waste and increased costs due to its height being too high.

[0083] The height of the conductive material is arbitrarily set to 60 μm to 70 μm. This maximizes the overall effect.

[0084] It should be noted that the height of the conductive member may be a constant value within the range of 30 μm to 100 μm, or it may be uneven within the range of 30 μm to 100 μm.

[0085] Example 6 Referring to FIG. 5, in some optional embodiments, the area of the interconnector electrical connection region 101 is 0.02 mm 2 ~0.6 mm 2 . The area of the interconnector electrical connection region 101 is, for example, 0.02 mm 2 , 0.03 mm 2 , 0.375 mm 2 , 0.4 mm 2 , 0.5 mm 2 , 0.6 mm 2 .

[0086] Thereby, since the area of the interconnector electrical connection region 101 is within an appropriate range, it is possible to avoid the instability of the connection between the busbarless back contact type battery 100 and the interconnector due to the area being too small, and it is also possible to avoid the waste of the conductive material and the deterioration of the insulation effect due to the area being too large.

[0087] [[ID=No.24]]Optionally, the interconnector electrical connection region 101 has an area of 0.375 mm 2 , is rectangular, has a width of 0.15 mm, and a length of 0.25 mm. Thus, it combines the connection between the busbarless back contact type battery 100 and the interconnector, the saving of the conductive material, and the insulation, and has the highest overall effect.

[0088] Example 7 Referring to FIG. 5, in some optional embodiments, the number of the interconnector electrical connection regions 101 is 1000 to 4000. The number of the interconnector electrical connection regions 101 is, for example, 1000, 1500, 2000, 250, 3000, 3500, 3800, 4000.

[0089] Thus, since the number of the interconnector electrical connection regions 101 is within an appropriate range, it is possible to avoid the instability of the connection between the busbarless back contact type battery 100 and the interconnector due to the number being too small, and it is also possible to avoid the low efficiency and high cost due to the number being too large.

[0090] It should be noted that this quantity range of 1,000 to 4,000 corresponds to a single whole battery sheet for the busbar-less back-contact battery 100. If the busbar-less back-contact battery 100 is divided into half, one-third, or other proportions of battery sheets from a single whole battery sheet, it should be understood that the number of interconnector electrical connection areas 101 may be determined based on the division ratio and the range of 1,000 to 4,000. For example, if the busbar-less back-contact battery 100 is divided into half of a single whole battery sheet, the number of interconnector electrical connection areas 101 is between 500 and 2,000.

[0091] Example 8 Referring to Figure 5, in some arbitrary embodiments, the busbar-less back-contact type battery 100 includes a second insulating member 22, which connects two adjacent first insulating members 21 and, together with the adjacent first insulating members 21, is enclosed in an interconnector electrical connection area 101.

[0092] In this way, the first insulating member 21 and the second insulating member 22, which are connected to each other, surround the interconnect electrical connection area 101, thereby preventing the conductive material from flowing from the interconnect electrical connection area 101 onto the fingers of opposite polarity to the interconnect. This avoids electrical contact between the interconnect and fingers of different polarity, ensuring the normal operation of the busbar-less back-contact type battery 100 and reducing the risk of short circuits in the busbar-less back-contact type battery 100. At the same time, it prevents the conductive material from flowing from the interconnect electrical connection area 101 onto fingers of the same polarity to the interconnect, which would cause the height of the conductive member formed by curing the conductive material to decrease, thereby avoiding connection failures with the interconnect.

[0093] Optionally, two first insulating members 21 and two second insulating members 22 may be enclosed within a rectangular interconnect electrical connection area 101, where the two first insulating members 21 are located on two opposing sides of the rectangle, and the two second insulating members 22 are located on the other two opposing sides of the rectangle.

[0094] In other embodiments, the number of second insulating members 22 corresponding to each interconnect electrical connection area 101 may be three, four, five, or any other number, and the first insulating member 21 and the second insulating member 22 may surround the interconnect electrical connection area 101 in other ways, and it should be understood that the specific surrounding form of the first insulating member 21 and the second insulating member 22 is not limited here.

[0095] Example 9 Referring to Figure 5, in several arbitrary embodiments, the width x of the second insulating member 22 is 1 mm to 3 mm. The width x of the second insulating member 22 is, for example, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.3 mm, 2.5 mm, 2.7 mm, and 3 mm.

[0096] Thus, because the width x of the second insulating member 22 is within an appropriate range, it is possible to avoid the inability to block the outflow of conductive material due to a width that is too narrow, and to avoid material waste and increased costs due to a width that is too wide.

[0097] Optionally, the width x of the second insulating member 22 is 2 mm. This provides the greatest overall effect in insulation and energy saving.

[0098] It should be noted that the width x of the second insulating member 22 may be a constant value within the range of 1 mm to 3 mm, or it may be uneven within the range of 1 mm to 3 mm.

[0099] Example 10 In some optional embodiments, the first insulating member 21 is a transparent insulating member.

[0100] In this way, the shielding of sunlight by the first insulating member 21 can be reduced, so that more sunlight is absorbed by the busbar-less back-contact type battery 100, which is advantageous for improving the photoelectric conversion efficiency.

[0101] It should be noted that "transparent" means that the transmittance of the first insulating member 21 to visible light at a thickness of 20 micrometers is 70% or more.

[0102] In other embodiments, the first insulating member 21 may be an opaque insulating member and should be understood to be not limited herein.

[0103] In some optional embodiments, the second insulating member 22 is a transparent insulating member. This further reduces the shielding of sunlight by the insulating member, which is advantageous in further improving the photoelectric conversion efficiency.

[0104] It should be noted that the interpretation and explanation regarding the second insulating member 22 being a transparent insulating member are similar to those for the first insulating member 21, so you can refer to the relevant information for the first insulating member 21, and a detailed explanation will be omitted here.

[0105] Example 11 In some optional embodiments, the first insulating member 21 is a transparent fluorescent insulating member.

[0106] Thus, since the first insulating member 21 emits light when irradiated with a light source of the corresponding wavelength, the position of the first insulating member 21 can be easily detected, which is advantageous in improving the accuracy of installing the first insulating member 21 on the busbar-less back-contact type battery 100.

[0107] In some optional embodiments, the second insulating member 22 is a transparent fluorescent insulating member. In this way, since the second insulating member 22 emits light when irradiated with a light source of the corresponding wavelength, the position of the second insulating member 22 can be easily detected, which is advantageous in improving the accuracy of installing the second insulating member 22 on a busbar-less back-contact type battery.

[0108] It should be noted that the interpretation and explanation regarding the second insulating member 22 being a transparent fluorescent insulating member are similar to those for the first insulating member 21, so you can refer to the relevant information for the first insulating member 21, and a detailed explanation will be omitted here.

[0109] Example 12 In several optional embodiments, transparent fluorescent insulating members are fabricated with a transparent insulating adhesive. The transparent insulating adhesive comprises 60% to 80% by mass of resin components, 5% to 15% by mass of inorganic fillers, 5% to 15% by mass of curing agents, less than 10% by mass of solvent, and 0.1% to less than 1% by mass of fluorescent agents.

[0110] Thus, because the insulating adhesive is a transparent insulating material, it can reduce the shielding of sunlight, thereby allowing more sunlight to be absorbed by the busbar-less back-contact type battery 100, which is advantageous for improving the photoelectric conversion efficiency. At the same time, since the transparent insulating adhesive contains 0.1% or more and less than 1% by mass of fluorescent agent, it emits light when irradiated with a light source of the corresponding wavelength, which is advantageous for improving the accuracy of the installation of the transparent insulating adhesive on the busbar-less back-contact type battery 100.

[0111] Optionally, a transparent insulating adhesive may be applied to the busbar-less back-contact type battery 100 by methods such as screen printing, jet dispensing, or coating.

[0112] Optionally, the coverage area percentage of the transparent insulating adhesive on the busbar-less back-contact type battery 100 is greater than 10%.

[0113] The mass percentage of the resin component can be, for example, 60%, 62%, 65%, 70%, 73%, 75%, 78%, or 80%. In this way, because the mass percentage of the resin component is within an appropriate range, the brittleness of the first insulating member 21 formed by curing the insulating adhesive can be reduced, and the bending resistance and impact resistance of the first insulating member 21 can be improved.

[0114] The mass percentage of the inorganic filler can be, for example, 5%, 6%, 8%, 10%, 11%, 14%, or 15%. By using relatively inexpensive inorganic fillers in this way, the amount of resin component used can be reduced, thereby lowering the cost of the transparent insulating adhesive. Moreover, since the inorganic filler can improve the mechanical properties of the transparent insulating adhesive, the installation and adhesion of the insulating adhesive becomes easier.

[0115] The mass percentage of the hardener can be, for example, 5%, 8%, 10%, 11%, 14%, or 15%. In this way, the transparent insulating adhesive can be cured within a predetermined process time.

[0116] The mass percentage of the solvent can be, for example, 9.99%, 9%, 7%, 5%, 4%, 2%, or 0.1%. In this way, other materials in the transparent insulating adhesive can be dissolved, and the viscosity of the transparent insulating adhesive can be adjusted.

[0117] The mass percentage of the fluorescent agent can be, for example, 0.99%, 0.95%, 0.8%, 0.6%, 0.5%, 0.3%, or 0.1%. The fluorescent agent enhances whiteness, and if its mass percentage is 1% or higher, it affects the light transmittance of the transparent insulating adhesive itself. When the mass percentage of the fluorescent agent is 0.1% or higher and less than 1%, the light transmittance of the insulating adhesive itself can be improved, which is advantageous in ensuring photoelectric conversion efficiency. Furthermore, when the mass percentage of the fluorescent agent is 0.1% or higher and less than 1%, the cost is not excessively high, ensuring the insulating adhesive is detectable, and is advantageous in ensuring the normal operation of the solar cell and reducing the cost of the busbar-less back-contact type battery 100.

[0118] In several optional embodiments, the resin component comprises at least one of modified polyacrylate, modified polyurethane, modified polyamide, modified polyesteramide, modified polycarbonate, modified silicone ester, modified styrene ester, polystyrene, polytetrafluoroethylene, polyformaldehyde, modified phenol ester, modified polyester, modified polyacyl ester, and modified epoxy resin. Thus, a variety of resin component forms are provided, which can be adapted to more actual manufacturing scenarios and actual manufacturing needs, and is advantageous in improving the manufacturing efficiency of transparent insulating adhesives. Moreover, the resin component can reduce the brittleness of the first insulating member 21 formed by curing the transparent insulating adhesive and improve the bending resistance and impact resistance of the first insulating member 21.

[0119] In some optional embodiments, the inorganic filler includes talc powder. Thus, by using relatively inexpensive talc powder, the amount of resin component used can be reduced, thereby lowering the cost of the transparent insulating adhesive. Furthermore, talc powder can enhance the thermal stability and corrosion resistance of the transparent insulating adhesive, resulting in higher quality. Additionally, because talc powder has insulating properties, it can improve the insulating performance of the transparent insulating adhesive.

[0120] In some optional embodiments, the talc powder comprises at least one of barium sulfate, calcium carbonate, and titanium dioxide. Thus, the availability of diverse forms of talc powder allows for adaptation to a wider range of practical manufacturing scenarios and needs, which is advantageous for improving the manufacturing efficiency of transparent insulating adhesives.

[0121] In some optional embodiments, the curing agent includes an imidazole derivative. Thus, using an imidazole derivative as a curing agent can improve the curing speed of the insulating adhesive and reduce curing costs.

[0122] In several optional embodiments, the imidazole derivative comprises at least one of aliphatic amines, aromatics, and acid anhydrides as curing agents. Thus, a variety of curing agent forms are provided, allowing for adaptation to more practical manufacturing scenarios and actual manufacturing needs, which is advantageous for improving the manufacturing efficiency of transparent insulating adhesives. Optionally, the aliphatic amine includes ethylenediamine and / or xylenediamine.

[0123] For example, aliphatic amines include ethylenediamine; also for example, aliphatic amines include xylenediamine; further for example, aliphatic amines include ethylenediamine and xylenediamine. Optionally, aromatics include m-phenylenediamine and / or diaminodiphenylmethane.

[0124] For example, the aromatic compound includes m-phenylenediamine; also, for example, the aromatic compound includes diaminodiphenylmethane; further, for example, the aromatic compound includes m-phenylenediamine and diaminodiphenylmethane. Optionally, the acid anhydride curing agent includes phthalic anhydride and / or hexahydrophthalic anhydride. For example, the acid anhydride curing agent includes phthalic anhydride; also, for example, the anhydride curing agent includes hexahydrophthalic anhydride; further, for example, the acid anhydride curing agent includes phthalic anhydride and hexahydrophthalic anhydride.

[0125] In several optional examples, the solvent comprises at least one of dimethyl adipate, dimethyl succinate, dimethyl glutarate, dimethyl malonate, diethyl adipate, diethyl succinate, diethyl glutarate, dibutyl succinate, dibutyl glutarate, DBE, DBE-3, DBE-4, DBE-6, DBE-9, DBE-IB, and DBE-ME. Thus, dibasic acid esters can better perform their dissolving role, react with resin components to form linear or cyclic polymers, and form stable solid compounds after volatilization. Moreover, the availability of such diverse forms of dibasic acid esters allows for adaptation to more practical manufacturing scenarios and actual manufacturing needs, which is advantageous for improving the manufacturing efficiency of insulating adhesives.

[0126] Example 13 In several optional examples, the fluorescent agent includes at least one of the following: fluorescent whitening agent OB-1, fluorescent whitening agent-OB, aluminum oxide, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent materials, fluorescent whitening agent BC, fluorescent whitening agent JD-3, fluorescent whitening agent BR, fluorescent whitening agent-EBF, fluorescent whitening agent R, fluorescent whitening agent ER, 1,8-naphthalimide fluorescent compounds, polyphenyls, polythiophenes, polyfluorenes, polytriphenylamines, polytriphenylamine derivatives, polycarbazoles, polypyrroles, polyporphyrins and their derivatives, copolymers, N,N-dimethylaminobenzaldinitrile compounds, 8-hydroxyquinoline aluminum, and europium metal complexes.

[0127] Thus, the availability of diverse forms of fluorescent agents allows for adaptation to a wider range of real-world manufacturing scenarios and needs, which is advantageous in improving the manufacturing efficiency of transparent insulating adhesives.

[0128] Optionally, rare earth fluorescent materials refer to fluorescent materials containing rare earth elements. That is, fluorescent materials containing at least one rare earth element from europium, samarium, erbium, and neodymium.

[0129] In one example, the fluorescent agent is the fluorescent whitening agent OB-1. When an insulating adhesive containing the fluorescent whitening agent OB-1 is irradiated with ultraviolet light, the visible fluorescence is blue, resulting in a strong visual effect.

[0130] In the following table, the resin component, curing agent, and solvent of the transparent insulating adhesive are 70% phenol epoxy resin, 10% imidazole derivative, and 5% anisole, respectively. The fluorescent agent is the fluorescent whitening agent OB-1 in all cases, and the inorganic filler is barium sulfate in all cases. The mass percentages of OB-1 and barium sulfate are shown in the following table.

[0131] The following table shows the fluorescence grayscale value, viscosity value, and light transmittance of a transparent insulating adhesive corresponding to each amount of fluorescent whitening agent OB-1 added, when the adhesive is 20 micrometers thick. It should be understood that the fluorescence grayscale value can characterize the fluorescence effect. The viscosity value can characterize the printability, with the highest printability occurring when the viscosity value is between 150 dpa·s and 250 dpa·s. Clearly, when the mass percentage of the fluorescent agent is 1% or more, the fluorescence effect of the transparent insulating adhesive is strong, but both the printability and light transmittance are low. When the mass percentage of the fluorescent agent is between 0.1% and less than 1%, the fluorescence of the transparent insulating adhesive is sufficiently detectable, and both the printability and light transmittance are high. Therefore, when the mass percentage of the fluorescent agent is between 0.1% and less than 1%, detectability, fluorescence effect, and printability can be ensured, resulting in a higher overall effect of the transparent insulating adhesive.

[0132] [Table 1]

[0133] In another example, the fluorescent agent is aluminum oxide. When an insulating adhesive using aluminum oxide as a fluorescent agent is exposed to ultraviolet light, the visible fluorescence is a pale blue, resulting in a strong visual effect.

[0134] In the following table, the resin component, curing agent, and solvent of the transparent insulating adhesive are all 70% phenol epoxy resin, 10% imidazole derivative, and 5% anisole, respectively. The fluorescent agent is aluminum oxide, and the inorganic filler is barium sulfate. The mass percentages of aluminum oxide and barium sulfate are shown in the following table.

[0135] The following table shows the fluorescence grayscale value, viscosity value, and light transmittance of a transparent insulating adhesive corresponding to each amount of aluminum oxide added, when the adhesive is 20 micrometers thick. Clearly, when the mass percentage of the fluorescent agent is 1% or more, the fluorescence effect of the transparent insulating adhesive is strong, but the printability and light transmittance are low. When the mass percentage of the fluorescent agent is 0.1% or more and less than 1%, the fluorescence of the transparent insulating adhesive is sufficiently detectable, and both the printability and light transmittance are high. Therefore, when the mass percentage of the fluorescent agent is 0.1% or more and less than 1%, detectability, fluorescence effect, and printability can be ensured, and the overall effect of the transparent insulating adhesive is higher.

[0136] [Table 2]

[0137] It should be noted that specific data for each item are shown here when the fluorescent agent is the fluorescent whitening agent OB-1, and also when the fluorescent agent is aluminum oxide.

[0138] Other fluorescent agents, such as fluorescent whitening agent-OB, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent materials, fluorescent whitening agent BC, fluorescent whitening agent JD-3, fluorescent whitening agent BR, fluorescent whitening agent-EBF, fluorescent whitening agent R, fluorescent whitening agent ER, 1,8-naphthalimide fluorescent compounds, polyphenyls, polythiophenes, polyfluorenes, polytriphenylamine, polytriphenylamine derivatives, polycarbazoles, polypyrroles, polyporphyrins and their derivatives, copolymers, N,N-dimethylaminobenzaldinitrile compounds, 8-hydroxyquinoline aluminum, and europium metal complexes, when their mass percentage is 0.1% or more and less than 1%, have a gray value range characterizing the fluorescence effect of 100-300, a viscosity value range characterizing printability of 150-300, and a light transmittance range of 85-90%. To avoid redundancy, a detailed explanation will be omitted here.

[0139] In other embodiments, the fluorescent agent may include fluorescent whitening agent-OB; in other embodiments, the fluorescent agent may include barium aluminate, rare earth fluorescent material, fluorescent whitening agent BC, and fluorescent whitening agent JD-3; in other embodiments, the fluorescent agent may include fluorescent whitening agent-EBF, fluorescent whitening agent R, fluorescent whitening agent ER, and 1,8-naphthalimide fluorescent compounds. The specific form of the fluorescent agent is not limited herein.

[0140] The busbar-less back-contact type battery 100 can be optionally irradiated with at least one of the following light rays: green light, blue light, infrared light, ultraviolet light, and white light. This causes the first insulating member 21, formed by curing the transparent insulating adhesive, to fluoresce, thereby allowing for accurate detection of the location of the transparent insulating adhesive.

[0141] Example 14 The battery assembly of the embodiment of this application includes a busbar-less back-contact type battery 100 as described in any one of Examples 1 to 13.

[0142] Thus, in the busbar-less back-contact type battery 100, the first insulating member 21 is provided in the current collection area 13 and covers the fingers with opposite polarity to the current collection area 13. This prevents electrical conductivity between the fingers with opposite polarity in the current collection area 13 and the weld ribbon, thereby reducing the risk of short circuits in the busbar-less back-contact type battery 100. At the same time, since the conductive member is provided in the electrical connection area, it becomes easy to connect fingers with the same polarity to the interconnector. As a result, the interconnector connects the busbar-less back-contact type battery 100 in series to the battery string and derives the current from the busbar-less back-contact type battery 100. Moreover, because there is no busbar, the busbar slurry can be omitted, reducing costs.

[0143] In this embodiment, multiple busbar-less back-contact type batteries 100 in a battery assembly can be connected in series sequentially to form a battery string, thereby realizing a series current collection output. For example, the series connection of the battery sheets can be achieved by providing welding ribbons (current collection bars, interconnection strips) or conductive back sheets.

[0144] In such embodiments, it should be understood that the battery assembly may further include a metal frame, a backsheet, a photovoltaic glass, and an adhesive film. The adhesive film may be filled as a filler between the front and back surfaces of the busbar-less back-contact type battery 100, as well as between the photovoltaic glass, adjacent battery sheets, etc., and may be a transparent adhesive with good light transmission and aging resistance. For example, the adhesive film may be an EVA adhesive film or a POE adhesive film, and may be specifically selected depending on the actual situation, and is not limited herein.

[0145] The photovoltaic glass may be covered on an adhesive film on the surface of the busbar-less back-contact type battery 100. The photovoltaic glass may be an ultra-white glass having high light transmittance, high transparency, and excellent physical, mechanical, and optical properties. For example, the light transmittance of the ultra-white glass can reach 92% or more, protecting the busbar-less back-contact type battery 100 with minimal impact on its efficiency. At the same time, the adhesive film can bond the photovoltaic glass to the busbar-less back-contact type battery 100. The presence of the adhesive film seals, insulates, and protects the busbar-less back-contact type battery 100 from water and moisture.

[0146] The backsheet can be attached to the adhesive film on the back of the busbar-less back-contact type battery 100, and the backsheet can protect and support the busbar-less back-contact type battery 100, possessing reliable insulation, water resistance, and aging resistance. Multiple options are available for the backsheet, and it may typically be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc., and can be set according to the specific situation, and is not limited herein. The entire assembly consisting of the backsheet, busbar-less back-contact type battery 100, adhesive film, and photovoltaic glass can be mounted on a metal frame, which may function as the main external support structure for the entire battery assembly and be used to stably support and mount the battery assembly, for example, the battery assembly can be mounted in the required position by the metal frame.

[0147] Example 15 The photovoltaic power generation system of the embodiment of this application includes the battery assembly of Embodiment 14.

[0148] Thus, in the busbar-less back-contact type battery 100, the first insulating member 21 is provided in the current collection area 13 and covers the fingers with opposite polarity to the current collection area 13. This prevents electrical conductivity between the fingers with opposite polarity in the current collection area 13 and the weld ribbon, thereby reducing the risk of short circuits in the busbar-less back-contact type battery 100. At the same time, since the conductive member is provided in the electrical connection area, it becomes easy to connect fingers with the same polarity to the interconnector. As a result, the interconnector connects the busbar-less back-contact type battery 100 in series to the battery string and derives the current from the busbar-less back-contact type battery 100. Moreover, because there is no busbar, the busbar slurry can be omitted, reducing costs.

[0149] In this embodiment, the photovoltaic power generation system may be applied to solar power plants such as ground-mounted power plants, roof-mounted power plants, and floating power plants, or to equipment or devices that generate electricity using solar energy, such as user-facing solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, the application scenarios of the photovoltaic power generation system are not limited to these; that is, it should be understood that the photovoltaic power generation system may be applied in any field where it is necessary to generate electricity using solar energy. Taking a photovoltaic power generation system network as an example, the photovoltaic power generation system may include a photovoltaic array, a junction box, and an inverter. The photovoltaic array may be an array-like combination of multiple battery assemblies; for example, multiple battery assemblies can constitute multiple photovoltaic arrays. The photovoltaic array is connected to a junction box, which can collect the current generated by the photovoltaic array. The collected current flows through an inverter and is converted into the AC current required for the urban power grid, after which it accesses the urban power grid to realize solar power supply.

[0150] In this specification, any description referring to terms such as “several examples,” “exemplary examples,” “examples,” “specific examples,” or “several examples” means that the specific features, structures, materials, or characteristics described in conjunction with the examples are included in at least one example of this application. In this specification, exemplary expressions of the above terms do not necessarily refer to the same examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more examples.

[0151] Furthermore, the foregoing is merely a preferred embodiment of the present application and is 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 within the scope of protection of the present application.

Claims

1. A busbar-less back-contact battery comprising a battery substrate, a first insulating member, and a conductive member, wherein two types of alternatingly distributed fingers of polarity are formed on the back surface of the battery substrate, the back surface comprises alternatingly distributed current-collecting regions and non-current-collecting regions, a portion of each finger located in the current-collecting region, and the remaining portion of each finger located in the non-current-collecting region; the current-collecting region includes an interconnector electrical connection region, the first insulating member is provided in the current-collecting region and covers the fingers of opposite polarity to the current-collecting region, exposing the interconnector electrical connection region; and the conductive member is provided in the interconnector electrical connection region.

2. The busbar-less back-contact type battery according to claim 1, characterized in that the thickness of the first insulating member is 10 μm to 50 μm.

3. The busbar-less back-contact type battery according to claim 1, characterized in that the length of the first insulating member is 1 mm to 3 mm.

4. The busbar-less back-contact type battery according to claim 1, characterized in that the width of the first insulating member is 0.2 mm to 0.6 mm.

5. The busbar-less back-contact type battery according to claim 1, characterized in that the height of the conductive member is 30 μm to 100 μm.

6. The area of ​​the electrical connection region of the interconnect is 0.02 mm². 2 ~0.6mm 2 The busbar-less back-contact type battery according to claim 1, characterized in that it is the battery described in claim 1.

7. The busbar-less back-contact type battery according to claim 1, characterized in that the number of interconnect electrical connection areas is 1,000 to 4,000.

8. The busbar-less back-contact type battery according to claim 1, wherein the busbar-less back-contact type battery includes a second insulating member, the second insulating member connects two adjacent first insulating members and together with the adjacent first insulating members is surrounded by the interconnector electrical connection area.

9. The busbar-less back-contact type battery according to claim 8, characterized in that the width of the second insulating member is 1 mm to 3 mm.

10. The busbar-less back-contact type battery according to claim 1, characterized in that the first insulating member is a transparent insulating member.

11. The busbar-less back-contact type battery according to claim 10, characterized in that the first insulating member is a transparent fluorescent insulating member.

12. The transparent fluorescent insulating member is made of a transparent insulating adhesive, and the transparent insulating adhesive is A resin component making up 60% to 80% by mass, Inorganic filler in a mass percentage of 5% to 15%, A hardening agent in a mass percentage of 5% to 15%, Solvents with a mass percentage of less than 10%, The busbar-less back-contact type battery according to claim 11, characterized by comprising a fluorescent agent in a mass percentage of 0.1% or more and less than 1%.

13. The busbar-less back-contact type battery according to claim 12, characterized in that the fluorescent agent comprises at least one of the following: fluorescent whitening agent OB-1, fluorescent whitening agent -OB, aluminum oxide, zinc oxide, zinc sulfide, calcium sulfide, strontium sulfide, strontium aluminate, calcium chlorate, barium aluminate, rare earth fluorescent material, fluorescent whitening agent BC, fluorescent whitening agent JD-3, fluorescent whitening agent BR, fluorescent whitening agent -EBF, fluorescent whitening agent R, fluorescent whitening agent ER, 1,8-naphthalimide fluorescent compounds, polyphenyl, polythiophene, polyfluorene, polytriphenylamine, polytriphenylamine derivatives, polycarbazole, polypyrrole, polyporphyrin and its derivatives, copolymer, N,N-dimethylaminobenzaldinitrile compounds, 8-hydroxyquinoline aluminum, and europium metal complex.

14. A battery assembly characterized by including a busbar-less back-contact type battery according to any one of claims 1 to 13.

15. A solar power generation system characterized by including the battery assembly described in claim 14.

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