Battery assembly and manufacturing method thereof, power utilization device and power generation device

Abstract

The invention discloses a battery assembly and a manufacturing method thereof, a power utilization device and a power generation device, and the battery assembly comprises a first substrate, a second substrate, a first battery located between the first substrate and the second substrate, and a second battery located between the first battery and the second substrate. The second substrate is provided with at least one through hole penetrating through the second substrate; a plurality of first bus bars electrically connected to the first battery and a plurality of second bus bars electrically connected to the second battery, located between the first substrate and the second substrate; a plurality of first outgoing lines, one end of each first outgoing line being connected to the first bus bar; one end of the second outgoing line is connected with the second bus bar, and the other end of the second outgoing line is led out from the through hole; the other end of the at least one first outgoing line is connected with the second bus bar; and / or the other end of the at least one first outgoing line is led out from the through hole, and the other end of the first outgoing line and the other end of the at least one second outgoing line are led out from the same through hole.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery components and manufacturing methods thereof, power-consuming devices, and power-generating devices. Background Art

[0002] Since the photoelectric conversion efficiency of crystalline silicon solar cell modules is limited, in order to make full use of the spectrum and energy conversion and break through the photoelectric conversion efficiency, perovskite solar cells can be superimposed on the top layer of crystalline silicon solar cells to form a crystalline silicon-perovskite stacked cell, and the crystalline silicon-perovskite cell stacked cell can be encapsulated between the front glass and the back glass to form a stacked cell module, thereby improving the efficiency of the cell module.

[0003] However, current crystalline silicon-perovskite cell stack modules usually require additional holes to be punched in the back glass to lead the busbars electrically connected to the perovskite solar cells out of the module. This increases the number of holes in the back glass and reduces the mechanical properties of the module. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a battery assembly to reduce the number of holes punched in the second substrate and improve the mechanical properties of the battery assembly.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides a battery assembly, comprising: a first substrate, a second substrate located on the first substrate, a first battery located between the first substrate and the second substrate, and a second battery located between the first battery and the second substrate; the second substrate has at least one through hole penetrating the second substrate; a plurality of first bus bars electrically connected to the first battery and a plurality of second bus bars electrically connected to the second battery, located between the first substrate and the second substrate; a plurality of first lead wires, one end of the first lead wire is connected to the first bus bar; at least one second lead wire, one end of the second lead wire is connected to the second bus bar, and the other end is led out from the through hole; wherein the other end of the at least one first lead wire is connected to the second bus bar; and / or the other end of the at least one first lead wire is led out from the through hole, and the other end of the first lead wire and the other end of the at least one second lead wire are led out from the same through hole.

[0007] In this technical solution, the battery assembly is a stacked battery assembly consisting of a first battery and a second battery, and a first bus bar electrically connected to the first battery and a second bus bar electrically connected to the second battery are located inside the space formed by the first substrate and the second substrate, wherein at least one of the first bus bar and the second bus bar are electrically connected inside the battery assembly through a first lead wire, so that for the first bus bar electrically connected to the second bus bar, there is no need to additionally set a lead wire that needs to be led out of the assembly to be connected separately, so there is no need to punch additional holes in the second substrate; and / or, the other end of at least one first lead wire connected to the first bus bar and the other end of at least one second lead wire are led out from the same through hole, so there is no need to punch additional holes in the second substrate to lead out the first lead wire separately, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of stacked battery assemblies.

[0008] In any embodiment, at least one second bus bar is disposed on at least one side of the second battery along a first direction parallel to the plane of the first substrate; or, The second battery includes a first battery group and a second battery group arranged in a first direction parallel to the plane of the first substrate, and at least one second bus bar is located between the first battery group and the second battery group; The battery assembly further includes a first sealing layer, which is located on a side of the second battery and the second bus bar facing the first battery and covers at least a portion of the first battery.

[0009] In this way, the first sealing layer plays a role in electrically isolating the first battery and the second battery.

[0010] In any embodiment, the first sealing layer has at least one opening penetrating the first sealing layer; wherein, One end of at least one first lead wire is connected to the first bus bar, and the other end is led out from the opening and connected to the second bus bar, so that at least one first bus bar and the second bus bar are interconnected inside the battery assembly; and / or, One end of at least one first lead wire is connected to the first bus bar, and the other end is led out from the opening and the through hole, so that at least one first bus bar and the second bus bar are independently arranged inside the battery assembly.

[0011] In any embodiment, at least one first lead includes a first sub-section, the first sub-section is located on the side of the first sealing layer facing the first substrate and connected to the first bus bar, and the first sub-section covers a portion of the first battery; the battery assembly further includes: a first insulating layer, the first insulating layer is located on the side of the first sub-section facing the first battery, and covers at least a portion of the first battery covered by the first sub-section. The first insulating layer is used to separate the first lead and the first battery to avoid the risk of short circuit.

[0012] In any embodiment, a plurality of second bus bars extend along the second direction and are arranged at intervals along the second direction, the opening is located between two adjacent second bus bars, the ends of the two adjacent second bus bars near the opening are connected to the second lead wire, the other end of the second lead wire led out of the opening and the other end of the first lead wire connected to the end of the second bus bar near the opening are led out from the same through hole; the second direction intersects with the first direction and is parallel to the plane of the first substrate. In this way, the first lead wire and the two second lead wires adjacent to it are led out from the same through hole, further reducing the number of holes punched in the second substrate and simplifying the battery assembly manufacturing process.

[0013] In any embodiment, in the second direction, at least one side edge of the first sealing layer has a notch, at least part of the first bus bar is exposed by the notch, at least one first lead wire is located on the surface of the first sealing layer away from the first battery, one end is connected to the first bus bar exposed by the notch, and the other end is connected to the second bus bar; the second direction intersects with the first direction and is parallel to the plane of the first substrate. In this way, there is no need to form an opening in the first sealing layer, the process of inserting the first lead wire through the opening is omitted, and the first lead wire is separated from the first battery by the first sealing layer, and there is no need to set the first insulating layer, which further simplifies the manufacturing process of the battery assembly.

[0014] In any embodiment, at least one of the first busbars is located at least on one side of the first sealing layer along the second direction and is spaced from the first sealing layer, the second direction intersects with the first direction and is parallel to the plane of the first substrate; the battery assembly also includes: a second insulating layer, the second insulating layer is located between the first busbar and the first sealing layer and covers part of the first battery, at least one of the first lead wires is located on the side of the first sealing layer and the second insulating layer away from the first battery, one end is connected to the first busbar located on one side of the first sealing layer along the second direction, and the other end is connected to the second busbar. In this way, there is no need to form an opening in the first sealing layer, the process of inserting the first lead wire through the opening is omitted, and the first lead wire is separated from the first battery by the first sealing layer and the second insulating layer to avoid the risk of short circuit.

[0015] In any embodiment, at least one first bus bar is located on at least one side of the first sealing layer along the second direction and contacts the first sealing layer, at least one first lead wire is located on the side of the first sealing layer away from the first battery, one end is connected to the first bus bar located on one side of the first sealing layer along the second direction, and the other end is connected to the second bus bar; the second direction intersects with the first direction and is parallel to the plane of the first substrate. In this way, there is no need to form an opening in the first sealing layer, the process of inserting the first lead wire through the opening is omitted, and there is no need to set a second insulating layer, which further simplifies the manufacturing process of the battery assembly.

[0016] In any embodiment, a plurality of second bus bars are arranged on one side of the second battery along the first direction and arranged at intervals along the second direction, and the orthographic projection of the first lead wire on the plane where the second battery is located and the second bus bar are located on the same side of the second battery in the first direction; or, a plurality of second bus bars are arranged between the first battery group and the second battery group and arranged at intervals along the second direction, and the orthographic projection of the first lead wire on the plane where the second battery is located is located between the first battery group and the second battery group; the second direction intersects with the first direction and is parallel to the plane of the first substrate. In this way, it is convenient to lead the first lead wire to the vicinity of the second bus bar, so as to facilitate its connection with the second bus bar, or to facilitate the first lead wire and the second lead wire connected to the second bus bar from the same through hole, thereby reducing the process complexity of the first lead wire and simplifying the manufacturing process of the battery assembly.

[0017] In any embodiment, the first cell includes a thin film solar cell, the thin film solar cell includes a light absorbing layer, the light absorbing layer includes one or more of a perovskite light absorbing layer, an amorphous silicon light absorbing layer, a copper indium gallium selenide light absorbing layer, a cadmium telluride light absorbing layer, a gallium arsenide light absorbing layer, and an organic dye light absorbing layer; and / or the second cell includes a crystalline silicon solar cell. The above light absorbing layer can be used to prepare a thin film solar cell with a light absorbing layer thickness of micrometer or nanometer level to expand the application scenarios of the battery assembly.

[0018] The second aspect of the present application also provides a method for manufacturing a battery assembly, comprising: Providing a first substrate, forming a first battery on the first substrate, and forming a plurality of first bus bars and a plurality of first lead wires, wherein the first bus bar is electrically connected to the first battery, and one end of the first lead wire is connected to the first bus bar; Providing a second battery, placing the second battery on the first battery, and forming a plurality of second bus bars and at least one second lead wire, wherein the second bus bar is electrically connected to the second battery, and one end of the second lead wire is connected to the second bus bar; A second substrate is provided, and the second substrate is disposed on the second battery, wherein the second substrate has at least one through hole penetrating the second substrate, and the other end of the second lead wire is led out from the through hole; wherein, Before placing the second substrate on the second battery, connecting the other end of at least one first lead wire to the second bus bar; and / or, After the second substrate is disposed on the second battery, the other end of the at least one first lead wire is led out from the through hole, and the other end of the first lead wire and the other end of the at least one second lead wire are led out from the same through hole.

[0019] In the technical solution of the present application, at least one first bus bar and a second bus bar are electrically connected inside the battery assembly through a first lead-out wire. Thus, for the first bus bar electrically connected to the second bus bar, there is no need to additionally provide a lead-out wire that needs to be led out of the assembly to be separately connected thereto, and therefore no additional holes need to be punched on the second substrate; and / or, the other end of at least one first lead-out wire connected to the first bus bar and the other end of at least one second lead-out wire are led out from the same through hole. Thus, there is no need to additionally punch holes on the second substrate to separately lead out the first lead-out wire, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, and facilitating rapid mass production of laminated battery assemblies.

[0020] In any embodiment, at least one second bus bar is disposed on at least one side of the second battery along a first direction parallel to the plane of the first substrate; or, The second battery includes a first battery group and a second battery group arranged in a first direction parallel to the plane of the first substrate, and at least one second bus bar is located between the first battery group and the second battery group; Before placing the second battery on the first battery, the method further includes: forming a first sealing layer, the first sealing layer is located on the side of the second battery and the second bus bar facing the first battery, and covers at least a portion of the first battery. In this way, the first sealing layer plays a role in electrically isolating the first battery and the second battery.

[0021] In any embodiment, the first sealing layer also covers at least a portion of the first lead wire, and an opening penetrating the first sealing layer is formed on the first sealing layer; Connecting the other end of at least one first lead wire to the second bus bar, comprising: leading one end of the first lead wire away from the first bus bar out of the opening and connecting it to the second bus bar, so that at least one first bus bar and the second bus bar are interconnected inside the battery assembly; and / or, Leading out the other end of at least one first lead wire from the through hole includes: leading out one end of the first lead wire away from the first bus bar from the opening and the through hole, so that at least one first bus bar and the second bus bar are independently arranged inside the battery assembly.

[0022] In any embodiment, at least one first lead includes a first sub-portion; Before forming the first sealing layer, the method further includes: forming a first insulating layer, the first insulating layer is located on a side of the first sub-unit facing the first battery and covers at least a portion of the first battery covered by the first sub-unit, and after leading the end of the first lead wire away from the first bus bar out of the opening, the first sub-unit and the first insulating layer are located on a side of the first sealing layer facing the first substrate. The first insulating layer is used to separate the first lead wire and the first battery to avoid the risk of short circuit.

[0023] In any embodiment, along the second direction, a notch is formed on at least one side edge of the first sealing layer, at least part of the first bus bar is exposed by the notch, and one end of at least one first lead wire is connected to the first bus bar exposed by the notch; connecting the other end of at least one first lead wire to the second bus bar, including: leading the first lead wire out of the notch, laying it on the surface of the first sealing layer away from the first battery, and connecting the end of the first lead wire away from the notch to the second bus bar. In this way, there is no need to form an opening in the first sealing layer, the process of inserting the first lead wire through the opening is omitted, and the first lead wire is separated from the first battery by the first sealing layer, and there is no need to set the first insulating layer, which further simplifies the manufacturing process of the battery assembly.

[0024] In any embodiment, at least one of the first busbars is located at least on one side of the first sealing layer along the second direction and is spaced from the first sealing layer, the second direction intersects with the first direction and is parallel to the plane of the first substrate; the method further includes: forming a second insulating layer, the second insulating layer is located between the first busbar and the first sealing layer and covers part of the first battery, at least one first lead wire is formed on the side of the first sealing layer and the second insulating layer away from the first battery, one end is connected to the first busbar located on one side of the first sealing layer along the second direction, and the other end is connected to the second busbar. In this way, there is no need to form an opening in the first sealing layer, the process of inserting the first lead wire through the opening is omitted, and the first sealing layer and the second insulating layer are used to separate the first lead wire and the first battery to avoid the risk of short circuit.

[0025] In any embodiment, at least one first bus bar is located on at least one side of the first sealing layer along the second direction and contacts the first sealing layer, at least one first lead wire is formed on the side of the first sealing layer away from the first battery, one end is connected to the first bus bar located on the side of the first sealing layer along the second direction, and the other end is connected to the second bus bar; the second direction intersects with the first direction and is parallel to the plane of the first substrate. In this way, there is no need to form an opening in the first sealing layer, the process of inserting the first lead wire through the opening is omitted, and the first lead wire is separated from the first battery by the first sealing layer, and there is no need to set up an additional second insulating layer, which further simplifies the manufacturing process of the battery assembly.

[0026] The third aspect of the present application also provides an electrical device, which includes the battery assembly of the first aspect of the present application.

[0027] The fourth aspect of the present application also provides a power generation device, which includes the battery assembly of the first aspect of the present application.

[0028] The details of one or more embodiments of the present disclosure are set forth in the accompanying drawings and the description below. Other features and advantages of the present disclosure will become apparent from the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic block diagram of an electric device provided in some embodiments of the present application; Figure 2 A schematic block diagram of a power generation device provided in some embodiments of the present application; Figure 3 A schematic top view of a battery assembly provided in some embodiments of the present application; Figure 4 for Figure 3 Enlarged view of the middle Q region; Figure 5 For along Figure 3 A schematic diagram of the cross-sectional structure taken along the line connecting A and A'; Figure 6 For along Figure 3 A schematic cross-sectional structure diagram taken along line BB'; Figure 7 for Figure 3 A schematic top view of a first battery; Figure 8 for Figure 7 A schematic diagram of the structure of the first sub-battery; Fig. 9 for Figure 3 A schematic top view of the second battery; Fig.10 for Figure 3 The circuit schematic diagram of the battery assembly; Fig.11 A schematic top view of a battery assembly provided in some other embodiments of the present application; Fig.12 for Fig.11 Enlarged view of the middle Q region; Fig.13 For along Fig.11 A schematic diagram of the cross-sectional structure taken along the line connecting A and A'; Fig.14 for Fig.11 The circuit schematic diagram of the battery assembly; Fig.15 A schematic top view of a battery assembly provided in some other embodiments of the present application; Fig.16 for Fig.15 Enlarged view of the middle Q region; Fig.17 For along Fig.15 A schematic diagram of the cross-sectional structure taken along the line connecting A and A'; Fig.18 A schematic top view of a battery assembly provided in some further embodiments of the present application; Fig.19 for Fig.18 Enlarged view of the middle Q region; Fig. 20 For along Fig.18 A schematic diagram of the cross-sectional structure taken along the line connecting A and A'; Fig.21 A schematic top view of a battery assembly provided in some other embodiments of the present application; Fig. 22 for Fig.21 Enlarged view of the middle Q region; Fig.23 For along Fig.21 A schematic diagram of the cross-sectional structure taken along the line connecting A and A'; Fig.24 A schematic top view of a battery assembly provided in some other embodiments of the present application; Fig.25 and Fig.26 for Fig.24 Different examples of schematic top views of the first battery; Fig. 27 for Fig.24 A schematic top view of the second battery; Fig.28 A flowchart of a method for manufacturing a battery assembly provided for some embodiments of the present application; Fig.29 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 1 ; Fig.30 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 2 ; Fig.31 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 3 ; Fig.32 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 4 ; Fig.33 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 5 ; Fig.34 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 6 ; Fig.35 Schematic diagram of the structure of the battery assembly during the manufacturing process provided in some embodiments of the present application Figure 7 .

[0031] Description of reference numerals: 1 power-consuming device; 2 power-generating device; 100 battery assembly; 101 first substrate; 102 second substrate; 11 first battery; 12 first sub-battery; 121 first electrode layer; 122 functional layer; 1221 first transmission layer; 1222 light-absorbing layer; 1223 second transmission layer; 123 second electrode layer; 13 first bus bar; 14 first lead wire; 141 first sub-unit; 15 second battery; 151 battery pack; Z1 first battery pack; Z2 second battery pack; 152 battery string pack; 153 battery string; 16 second sub-battery; 17 second bus bar; 18 second lead wire; 19 interconnection bar; 21 third bus bar; 22 first insulating layer; 23 first sealing layer; 24 second sealing layer; 25 third sealing layer; 26 second insulating layer; S1 opening; S2 notch; S3 through hole. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0040] Below, this application is described in detail.

[0041] Current crystalline silicon-perovskite stacked cell modules usually require the use of multiple bus bars to electrically connect to the crystalline silicon solar cells and the perovskite solar cells respectively, and the multiple bus bars are led out of the cell module through multiple through holes located on the back panel glass. The bus bar connected to the perovskite solar cell and the bus bar connected to the crystalline silicon solar cell are led out from different through holes. Therefore, it is necessary to additionally punch holes in the back panel glass to lead out the bus bar connected to the perovskite solar cell. This increases the number of openings in the back panel glass and reduces the mechanical properties of the cell module.

[0042] Based on this, the inventors proposed a technical solution, in which the battery assembly is a stacked battery assembly consisting of a first battery and a second battery, and a first bus bar electrically connected to the first battery and a second bus bar electrically connected to the second battery are located inside the space formed by the first substrate and the second substrate, wherein at least one of the first bus bar and the second bus bar are electrically connected inside the battery assembly through a first lead wire, so that for the first bus bar electrically connected to the second bus bar, there is no need to additionally set a lead wire that needs to be led out of the assembly to be connected separately, so there is no need to make additional holes in the second substrate; and / or, the other end of at least one first lead wire connected to the first bus bar and the other end of at least one second lead wire are led out from the same through hole, so there is no need to make additional holes in the second substrate to lead out the first lead wire separately, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of stacked battery assemblies.

[0043] The technical solutions described in the embodiments of the present application are applicable to battery assemblies, electrical devices using battery assemblies, and power generation devices using battery assemblies. Figure 1 A schematic block diagram of an electric device 1 provided for some embodiments of the present application, the electric device 1 includes a battery assembly 100. Among them, the electric device 1 can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electric device 1.

[0044] Figure 2 This is a schematic block diagram of a power generation device 2 provided in some embodiments of the present application, and the power generation device 2 includes a battery assembly 100. The power generation device 2 may also have a control system and a transmission system. The power generation device 2 provided in the present application adjusts the electric energy generated by the battery assembly 100 to the electric energy that can match the electric equipment through the control system and the transmission system.

[0045] Next, refer to 2a to Fig. 27 Some embodiments of the present application are described in detail. Figure 3 , Fig.11 , Fig.15 , Fig.18 , Fig.21 , Fig.24The second sealing layer, the third sealing layer, the second substrate and other structures are omitted.

[0046] As shown in the figure, the present application provides a battery assembly, including: a first substrate 101, a second substrate 102 located on the first substrate 101, a first battery 11 located between the first substrate 101 and the second substrate 102, and a second battery 15 located between the first battery 11 and the second substrate 102; the second substrate 102 has at least one through hole S3 penetrating the second substrate 102; a plurality of first bus bars 13 electrically connected to the first battery 11 and a plurality of second bus bars 17 electrically connected to the second battery 15, located on the first substrate 101 and the second substrate 102; a plurality of first lead-out wires 14, one end of the first lead-out wire 14 being connected to the first bus bar 13; at least one second lead-out wire 18, one end of the second lead-out wire 18 being connected to the second bus bar 17, and the other end being led out from the through hole S3; wherein the other end of at least one first lead-out wire 14 is connected to the second bus bar 17; and / or the other end of at least one first lead-out wire 14 is led out from the through hole S3, and the other end of the first lead-out wire 14 and the other end of at least one second lead-out wire 18 are led out from the same through hole S3.

[0047] In some embodiments, the materials of the first substrate 101 and the second substrate 102 may be the same or different. In some embodiments, the first substrate 101 and the second substrate 102 include inorganic substrates made of quartz, sapphire, glass, etc., and transparent plastic substrates made of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, polyethylene, polypropylene, polyphenylene sulfide, polyvinylidene fluoride, tetraacetyl cellulose, brominated phenoxy, aromatic polyamide, polyimide, polystyrene, polyarylate, polysulfone, polyolefin, etc. In a specific embodiment, both the first substrate 101 and the second substrate 102 may be glass substrates.

[0048] like Figure 6 As shown, in some embodiments, the edges of the first battery 11 and the second battery 15 are indented inward relative to the edges of the first substrate 101 and the second substrate 102; the battery assembly may further include: a third sealing layer 25, the third sealing layer 25 is arranged along the edges of the first substrate 101 and the second substrate 102, and the second substrate 102 and the first substrate 101 are sealed and connected through the third sealing layer 25. The material of the third sealing layer 25 includes but is not limited to butyl rubber.

[0049] In some embodiments, the first battery 11 may include one or more first sub-batteries 12. When there are multiple first sub-batteries 12, the multiple first sub-batteries 12 may be connected in series, in parallel, or in mixed connection. Figure 7As shown, in some embodiments, the first battery 11 includes a plurality of first sub-batteries 12 arranged along a third direction on the first substrate 101 and extending along a fourth direction intersecting (including perpendicular or oblique) the third direction, and the plurality of first sub-batteries 12 are sequentially connected in series along the third direction.

[0050] like Figure 8 As shown, in some embodiments, the first sub-cell 12 includes a first electrode layer 121 , a functional layer 122 , and a second electrode layer 123 sequentially stacked from bottom to top on the first substrate 101 .

[0051] In some embodiments, the material of the first electrode layer 121 and the second electrode layer 123 can be a transparent electrode material, including but not limited to one or more of indium tin oxide (ITO), aluminum zinc oxide (AZO), tungsten-doped indium oxide (IWO), cerium-doped indium oxide (ICO), fluorine-doped tin oxide (FTO), zinc-doped zinc oxide (IZO) and antimony-doped tin oxide (ATO), such as fluorine-doped tin oxide (FTO), so that light incident from the first substrate 101 can penetrate the first cell 11 to reach the second cell 15.

[0052] In some embodiments, the functional layer 122 includes a light absorbing layer 1222, which is located between the first electrode layer 121 and the second electrode layer 123; the light absorbing layer 1222 includes one or more of a perovskite light absorbing layer, an amorphous silicon light absorbing layer, a copper indium gallium selenide light absorbing layer, a cadmium telluride light absorbing layer, a gallium arsenide light absorbing layer, and an organic dye light absorbing layer, and the above light absorbing layer can be used to prepare a thin-film solar cell with a light absorbing layer thickness of micrometer or nanometer level to expand the application scenarios of the battery assembly. Further, the light absorbing layer 1222 can be a perovskite light absorbing layer, and the first battery 11 includes a perovskite solar cell.

[0053] In some embodiments, the functional layer 122 also includes a first transport layer 1221 located between the first electrode layer 121 and the light absorbing layer 1222, and / or a second transport layer 1223 located between the light absorbing layer 1222 and the second electrode layer 123, one of the first transport layer 1221 and the second transport layer 1223 is an electron transport layer, and the other is a hole transport layer. The provision of the electron transport layer and / or the hole transport layer helps to extract and transmit the electron-hole pairs generated by the light absorbing layer 1222 to the corresponding electrode, thereby improving the carrier transport capacity. According to actual conditions, the electron transport layer and the hole transport layer can be respectively provided on both sides of the light absorbing layer 1222, or one of the two can be selected on one side of the light absorbing layer 1222, such as only providing a hole transport layer, which is not limited here.

[0054] like Figure 7As shown, in some embodiments, the number of the first bus bars 13 may be two, and the two first bus bars 13 may be connected to the positive electrode and the negative electrode of the first battery 11, respectively. In some embodiments, the first bus bar 13 is disposed on a surface of the first sub-battery 12 located at the edges of both sides of the first battery 11 along the third direction, which is away from the first substrate 101, and extends along the extension direction (fourth direction) of the first sub-battery 12, and the first bus bar 13 may be connected to the second electrode layer 123 of the first sub-battery 12 located at the edge along the third direction, respectively. However, it is not limited thereto, the number of the first bus bars 13 may be more, and the first bus bar 13 and the first battery 11 may also have other connection modes.

[0055] Figure 7 The extending length of the first bus bar 13 in the fourth direction shown in FIG. 1 is the same as the extending length of the first battery 11 in the fourth direction, but the invention is not limited thereto. The extending length of the first bus bar 13 in the fourth direction may also be longer or shorter.

[0056] In some embodiments, the first lead wires 14 are respectively disposed at two side edges of the first battery 11 along the third direction and extend toward a middle area of ​​the first battery 11 .

[0057] In actual operation, the material of the first bus bar 13 may include a conductive tape to facilitate bonding with the first sub-battery 12, for example, it may be one or more of a conductive cloth-based tape, a conductive rubber tape, a conductive copper tape, etc.; the material of the first lead wire 14 may include one or more of copper, aluminum, silver, gold, tin-plated copper or its alloy, etc. However, it is not limited thereto, the material of the first bus bar 13 may also be the same as the material of the first lead wire 14, and the first bus bar 13 and the first lead wire 14 may also be formed integrally.

[0058] In some embodiments, the second cell 15 may be a crystalline silicon solar cell, and a side of the second cell 15 facing the first cell 11 may be a front side, and a side of the second cell 15 facing away from the first cell 11 may be a back side.

[0059] In some embodiments, the second battery 15 may include one battery pack 151 or a plurality of battery packs 151 distributed at intervals; Fig. 9 As shown, in the case where there are multiple battery groups 151, the multiple battery groups 151 may include first battery groups Z1 and second battery groups Z2 that are spaced and arranged adjacent to each other along a first direction parallel to the plane of the first substrate 101, and at least one second bus bar 17 is located between the first battery group Z1 and the second battery group Z2; but not limited to this, as Fig.24 and Fig. 27As shown, at least one second bus bar 17 can also be arranged along the first direction on at least one side of the second battery 15. In this way, in the vertical direction, the second battery 15 will not block or hinder the second bus bar 17, which is convenient for the subsequent leading out of the first lead wire 14 from below the plane where the second battery 15 is located, thereby facilitating the connection of the first lead wire 14 with the second bus bar 17, or leading the first lead wire 14 from the through hole S3, and avoiding the first lead wire 14 from blocking the second battery 15 from light.

[0060] In some embodiments, each battery group 151 may include a plurality of battery string groups 152 (for example, 3) arranged along the second direction and connected in series, any battery string group 152 may include a plurality of battery strings 153 (for example, two) arranged along the second direction and connected in series, each battery string 153 may include a plurality of second sub-batteries 16 arranged along the first direction and connected in series, and the second sub-batteries 16 may be a whole cell or a half cell, etc.

[0061] Here, the first direction and the second direction intersect and are both parallel to the plane of the first substrate 101 , and the first direction may be the same as the extension direction of the first sub-battery 12 (ie, the fourth direction), and the second direction may be the same as the arrangement direction of the plurality of first sub-batteries 12 (ie, the third direction).

[0062] In some embodiments, the second sub-battery 16 may include a third electrode layer (not shown) located on a side of the second sub-battery 16 facing the first battery 11, and a fourth electrode layer (not shown) located on a side of the second sub-battery 16 facing away from the first battery 11. The third electrode layer may be the negative electrode or positive electrode of the second sub-battery 16, and the fourth electrode layer may be the positive electrode or negative electrode of the second sub-battery 16. In some embodiments, the battery assembly further includes: a plurality of interconnecting bars 19, and the positive electrode or negative electrode of one of the two adjacent second sub-batteries 16 in each battery string 153 is electrically connected to the negative electrode or positive electrode of the other through the interconnecting bars 19, so that a plurality of second sub-batteries 16 in any battery string 153 are connected in series along the first direction.

[0063] like Fig. 9 and Fig.10As shown, in some embodiments, when the second battery 15 includes a first battery group Z1 and a second battery group Z2, the second sub-battery 16 can be a half-cell battery sheet, and a plurality of second bus bars 17 can be disposed between the first battery group Z1 and the second battery group Z2 and arranged at intervals along the second direction, and a plurality of battery string groups 152 of the first battery group Z1 and a plurality of battery string groups 152 of the second battery group Z2 are connected in parallel through the second bus bar 17, and two battery string groups 152 adjacent to each other in the second direction in any battery group 151 are connected in series through the second bus bar 17, and the two second bus bars 17 located at the edge along the second direction are electrically connected to the positive and negative electrodes of the second battery 15, respectively.

[0064] But not limited to this, such as Fig.24 and Fig. 27 As shown, in some other embodiments of the present application, a plurality of second bus bars 17 may also be located on one side of the second battery 15 along the first direction and arranged at intervals along the second direction, and the second battery 15 may include a battery group 151, the second sub-battery 16 in the battery group 151 may be a whole battery cell, two adjacent battery string groups 152 in the second direction are connected in series through the second bus bar 17, and the two second bus bars 17 located at the edge along the second direction are electrically connected to the positive and negative electrodes of the second battery 15, respectively.

[0065] like Fig. 9 and Fig. 27 As shown, in some embodiments, the battery assembly may further include: a plurality of third bus bars 21, which are located along the first direction on a side of any battery group 151 away from the plurality of second bus bars 17, and the battery strings 153 of the battery string group 152 are connected in series through the third bus bars 21. In actual operation, the second bus bar 17 and the third bus bar 21 may be electrically connected to the positive electrode or negative electrode of the corresponding second sub-battery 16 through a plurality of interconnection bars 19.

[0066] In actual operation, the materials of the second bus bar 17 , the interconnection bar 19 and the third bus bar 21 may include one or more of copper, aluminum, silver, gold, tin-plated copper or alloys thereof.

[0067] like Figure 5 and Figure 6 As shown, in some embodiments, the battery assembly further includes: a first sealing layer 23, which is located on the side of the second battery 15 and the second bus bar 17 facing the first battery 11, and covers at least a portion of the first battery 11. The first sealing layer 23 is used to electrically isolate the first battery 11 from the second battery 15, and the orthographic projection of the second battery 15 and the second bus bar 17 on the plane of the first substrate 101 falls within the orthographic projection of the first sealing layer 23 on the plane of the first substrate 101, and the edge of the first sealing layer 23 can slightly protrude outward from the edge of the second battery 15 to increase the isolation effect of the first sealing layer 23.

[0068] like Figures 3 to 5 As shown, in some embodiments, the first sealing layer 23 has an opening S1 that penetrates the first sealing layer 23; one end of at least one first lead-out line 14 is connected to the first bus bar 13, and the other end is led out from the opening S1 and connected to the second bus bar 17, that is, part of the first lead-out line 14 is located on the side of the first sealing layer 23 away from the first substrate 101 and is connected to the second bus bar 17, so that at least one first bus bar 13 and the second bus bar 17 are interconnected inside the battery assembly.

[0069] In actual operation, the end of the first lead wire 14 away from the first bus bar 13 can be overlapped on the upper surface or side surface of the second bus bar 17 and welded thereto. However, the present invention is not limited thereto, and the end of the first lead wire 14 away from the first bus bar 13 can also be welded to the lower surface of the second bus bar 17.

[0070] It should be noted that the interior of the battery assembly in the present application refers to the interior of the space formed by the first substrate 101 and the second substrate 102; leading out from the opening S1 refers to leading out from the side of the first sealing layer 23 toward the first substrate 101 through the opening S1 to the side of the first sealing layer 23 away from the first substrate 101.

[0071] In some embodiments, two first lead-out lines 14 are respectively arranged at the two side edges of the first battery 11 along the second direction and extend to the middle area of ​​the first battery 11, and the two first lead-out lines 14 are respectively connected to the two second bus bars 17 located at the edges along the second direction to realize parallel connection of the first battery 11 and the second battery 15 inside the battery assembly.

[0072] Figure 5 The opening S1 shown in the figure is located on both sides of the plurality of second bus bars 17 along the second direction. However, the present invention is not limited thereto, and the opening S1 may also be located between two adjacent second bus bars 17, and the end of the first lead wire 14 away from the first bus bar 13 may also be connected to other second bus bars 17 located between two second bus bars 17 at the edge along the second direction.

[0073] In some embodiments, the battery assembly further includes at least one second lead wire 18, one end of the second lead wire 18 is connected to the second bus bar 17, and the other end is led out from the through hole S3. In actual operation, the second lead wire 18 can be welded to the second bus bar 17, or the second lead wire 18 can also be formed integrally with the second bus bar 17. However, it is not limited thereto, and the second lead wire 18 can also be welded to the first lead wire 14 and contacted with the second bus bar 17.

[0074] like Figure 3 and Figure 5As shown, in some embodiments, a plurality of second bus bars 17 extend along the second direction and are arranged at intervals along the second direction, and two ends of any two adjacent second bus bars 17 that are close to each other are respectively connected to one end of the second lead-out wire 18, and the other end of the second lead-out wire 18 connected to the two ends that are close to each other can be led out from the same through hole S3 and introduced into the same junction box.

[0075] It should be noted that, in the present application, “leading out from the through hole S3” means that the lead wire is led out from the space formed by the first substrate 101 and the second substrate 102 through the through hole S3 , that is, led out from the inside of the battery assembly.

[0076] In some embodiments of the present application, a first bus bar 13 electrically connected to the first battery 11 and a second bus bar 17 electrically connected to the second battery 15 are located inside the battery assembly, and at least one of the first bus bar 13 and the second bus bar 17 are electrically connected inside the battery assembly through a first lead wire 14. In this way, for the first bus bar 13 electrically connected to the second bus bar 17, there is no need to additionally set up lead wires that need to be led out of the assembly to be connected separately thereto, and there is no need to make additional holes on the second substrate 102 to lead out the lead wires that are separately connected to the first bus bar 13, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of laminated battery assemblies.

[0077] Figures 3 to 5 The end of at least one first lead wire 14 led out from the opening S1 is connected to the second bus bar 17, so that at least one first bus bar 13 and the second bus bar 17 are electrically connected inside the assembly. However, the invention is not limited thereto, and the end of at least one first lead wire 14 led out from the opening S1 can also be led out from the through hole S3, so that at least one first bus bar 13 and the second bus bar 17 are independently arranged inside the battery assembly.

[0078] Specifically, Fig.11 and Fig.14 As shown, in some embodiments, one end of at least one first lead wire 14 is connected to the first bus bar 13, and the other end is led out from the opening S1 and the through hole S3, so that at least one first bus bar 13 and the second bus bar 17 are independently arranged inside the battery assembly.

[0079] In some embodiments of the present application, at least one first lead-out wire 14 at one end away from the first bus bar 13 and at least one second lead-out wire 18 at one end away from the second bus bar 17 are led out from the same through hole S3. In this way, there is no need to punch additional holes to lead out the first lead-out wire 14 separately, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of laminated battery assemblies.

[0080] In some embodiments, the opening S1 can be located between two adjacent second bus bars 17, and the ends of the two adjacent second bus bars 17 near the opening S1 are respectively connected to the second lead wire 18, and the other end of the first lead wire 14 led out from the opening S1 and the other end of the second lead wire 18 connected to the end of the second bus bar 17 near the opening S1 are led out from the same through hole S3, so that the first lead wire 14 and the two adjacent second lead wires 18 are led out from the same through hole S3 and can be introduced into the same junction box, further reducing the number of holes punched in the second substrate 102 and simplifying the battery assembly manufacturing process. Among them, the first lead wire 14 leading out of the battery assembly can be connected to the second lead wire 18, or it can be set independently from the second lead wire 18.

[0081] like Figures 11 to 14 As shown, in some embodiments, the number of the first lead-out wires 14 is two, one end of the two first lead-out wires 14 is electrically connected to the positive electrode and the negative electrode of the first battery 11 respectively through the first bus bar 13, and the other end is led out from different through holes S3 respectively, so that the circuit of the first battery 11 and the circuit of the second battery 15 are independently arranged inside the component.

[0082] But not limited to this, in some embodiments, the other end of part of the first lead-out line 14 can also be connected to the second bus bar 17, and the other end of part of the first lead-out line 14 can be led out from the through hole S3, which can be used to realize series connection, parallel connection or mixed connection of multiple first sub-batteries 12 and multiple second sub-batteries 16.

[0083] like Figure 5 , Figure 7 as well as Fig.13 As shown, in some embodiments, at least one first lead-out line 14 includes a first sub-portion 141, which is located on the side of the first sealing layer 23 facing the first substrate 101 and is connected to the first bus bar 13, and the first sub-portion 141 covers a portion of the first battery 11; the battery assembly also includes: a first insulating layer 22, which is located on the side of the first sub-portion 141 facing the first battery 11 and covers at least a portion of the first battery 11 covered by the first sub-portion 141, so that the first insulating layer 22 is used to separate the first lead-out line 14 and the first battery 11 to avoid the risk of short circuit.

[0084] In some embodiments, the first sub-portion 141 and the first insulating layer 22 may extend in a straight line along a third direction, but not limited thereto, the first sub-portion 141 and the first insulating layer 22 may also extend in a straight line along other directions, or along a curve or a fold line to increase the applicability of scenarios.

[0085] However, the present invention is not limited to this, and the first lead-out line 14 may also not be provided with the first sub-portion 141, and the opening S1 may be located above the first bus bar 13, one end of the first lead-out line 14 is located in the opening S1 and connected to the first bus bar 13 located below the opening S1, and the other end is located on the side of the first sealing layer 23 away from the first battery 11, and is connected to the second bus bar 17 or is led out from the through hole S3. In this way, the first lead-out line 14 is separated from the first battery 11 by the first sealing layer 23, and there is no need to additionally provide the first insulating layer 22.

[0086] like Figures 3 to 5 as well as Figures 11 to 13 As shown, in some embodiments, the first sealing layer 23 may completely cover the first battery 11, the first bus bar 13 and the first sub-portion 141, and the side wall of the first sealing layer 23 may be substantially flush with the side wall of the first battery 11, or protrude outward from the side wall of the first battery 11. However, it is not limited thereto, the first sealing layer 23 may also cover part of the first battery 11, and in the second direction, at least one side edge of the first sealing layer 23 may be indented inwardly relative to the edge of the first battery 11, and the first sealing layer 23 may cover part of the first bus bar or part of the first sub-portion 141.

[0087] like Figure 5 and Figure 6 as well as Fig.13 As shown, in some embodiments, the battery assembly further includes: a second sealing layer 24, the second sealing layer 24 is located between the second battery 15 and the second substrate 102, and covers the first battery 11, the second battery 15, the first bus bar 13 and the second bus bar 17, the first lead wire 14 and / or the second lead wire 18 passes through the second sealing layer 24 in a vertical direction and is led out from the through hole S3.

[0088] In actual operation, the materials of the first sealing layer 23 and the second sealing layer 24 can be the same or different. The materials of the first sealing layer 23 and the second sealing layer 24 can include one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer and polyvinyl butyral ester.

[0089] like Figures 15 to 17As shown, in some other embodiments of the present application, in the second direction, at least one side edge of the first sealing layer 23 has a notch S2, at least part of the first bus bar 13 is exposed by the notch S2, and at least one first lead wire 14 is located on the side of the first sealing layer 23 away from the first battery 11, one end of which is connected to the first bus bar 13 exposed by the notch S2, and the other end of which is connected to the second bus bar 17. In this way, there is no need to form an opening S1 in the first sealing layer 23, and the process of inserting the first lead wire 14 through the opening S1 is omitted, and the first lead wire 14 is separated from the first battery 11 by the first sealing layer 23, and there is no need to set the first insulating layer 22, which further simplifies the manufacturing process of the battery assembly.

[0090] In some embodiments, the notch S2 is located at both side edges of the first sealing layer 23 along the second direction, the first lead wire 14 extends toward the middle area of ​​the first battery 11 along the second direction, and is connected to the second bus bar 17 located at the edge along the second direction.

[0091] In actual operation, the first bus bar 13 may be a structure that extends continuously along the fourth direction below the first sealing layer 23, and only a portion of the first bus bar 13 is exposed by the notch S2. However, the first bus bar 13 may also be a structure that is disposed in the notch S2 and has a shorter extension length.

[0092] like Figures 18 to 20 As shown, in some other embodiments of the present application, at least one side edge of the first sealing layer 23 in the second direction is indented inward relative to the edge of the first battery 11, at least one first bus bar 13 is located on at least one side of the first sealing layer 23 along the second direction and is spaced apart from the first sealing layer 23, and the battery assembly further includes: a second insulating layer 26, the second insulating layer 26 is located between the first bus bar 13 and the first sealing layer 23 and covers a portion of the first battery 11, at least one first lead wire 14 is located on the surface of the second insulating layer 26 and the first sealing layer 23 facing away from the first battery 11, one end is connected to the first bus bar 13 located on at least one side of the first sealing layer 23 along the second direction, and the other end is connected to the second bus bar 17. In this way, there is no need to form an opening S1 in the first sealing layer 23, and the process of inserting the first lead wire 14 through the opening S1 is omitted, which further simplifies the manufacturing process of the battery assembly, and the first lead wire 14 is spaced apart from the first battery 11 by the first sealing layer 23 and the second insulating layer 26, thereby avoiding the risk of short circuit.

[0093] In some embodiments, in the second direction, both side edges of the first sealing layer 23 are indented inward relative to the edge of the first battery 11, the two first bus bars 13 are located on both sides of the first sealing layer 23 along the second direction, and the two first lead wires 14 are respectively connected to the second bus bars 17 located on the two side edges along the second direction.

[0094] like Figure 21 to Figure 23 As shown, in some embodiments, at least one first bus bar 13 is located on at least one side of the first sealing layer 23 along the second direction and contacts the first sealing layer 23, and at least one first lead wire 14 is located on the side of the first sealing layer 23 away from the first battery 11, with one end connected to the first bus bar 13 located on one side of the first sealing layer 23 along the second direction, and the other end connected to the second bus bar 17; in this way, there is no need to form an opening S1 in the first sealing layer 23, and the process of inserting the first lead wire 14 through the opening S1 is omitted, and the first lead wire 14 is separated from the first battery 11 by the first sealing layer 23, and there is no need to additionally set the second insulating layer 26, which further simplifies the manufacturing process of the battery assembly.

[0095] Figures 3 to 5 , Figures 15 to 17 , Figures 18 to 20 as well as Figure 21 to Figure 23 The structure shown provides different connection methods for the first bus bar 13 and the second bus bar 17 respectively. Any first bus bar 13 can be connected to the second bus bar 17 in any method, and multiple first bus bars 13 can be connected to the second bus bar 17 in the same or different methods.

[0096] Figures 3 to 23 In the battery assembly shown, the plurality of second bus bars 17 and the first lead wires 14 are located in the middle area of ​​the battery assembly. Fig.24 and Fig. 27 As shown, in some other embodiments of the present application, the plurality of second bus bars 17 and the first lead wires 14 may also be located in the end region of the battery assembly in the first direction.

[0097] Specifically, Figures 3 to 23 As shown, in some embodiments, when the plurality of second bus bars 17 are located between the first battery group Z1 and the second battery group Z2, the orthographic projection of the first lead wire 14 on the plane where the second battery 15 is located is located between the first battery group Z1 and the second battery group Z2. Fig.24 and Fig. 27As shown, in the case where a plurality of second bus bars 17 are arranged along the first direction on one side of the second battery 15 in the first direction, the orthographic projection of the first lead wire 14 on the plane where the second battery 15 is located is located on the same side of the second battery 15 in the first direction as the second bus bar 17. That is, in the present application, the first lead wire 14 and the second bus bar 17 are arranged in the same area of ​​the battery assembly, so that it is convenient to lead the first lead wire 14 to the vicinity of the second bus bar 17, so as to facilitate its connection with the second bus bar 17, or to facilitate the first lead wire 14 and the second lead wire 18 connected to the second bus bar 17 from the same through hole S3, thereby reducing the process complexity of the first lead wire 14 and simplifying the manufacturing process of the battery assembly.

[0098] Fig.25 The first lead wire 14 shown in the figure is located on the side of the first battery 11 away from the first substrate 101 , and the orthographic projection of the first lead wire 14 on the plane of the first substrate 101 falls within the orthographic projection of the first battery 11 on the plane of the first substrate 101 .

[0099] However, the present invention is not limited thereto, and the first lead wire 14 may also be disposed at other locations. Fig.26 As shown, in some other embodiments of the present application, the first lead wire 14 is arranged on one side of the first battery 11 along the first direction, and part of the first bus bar 13 protrudes from the edge of the first battery 11 along the first direction and is connected to the first lead wire 14 .

[0100] In some embodiments of the present application, when multiple second bus bars 17 and the first lead wire 14 are located in the end area of ​​the battery assembly in the first direction, the end of the first lead wire 14 away from the first bus bar 13 can be connected to the second bus bar 17 or led out from the through hole S3 in the same manner as described above, which will not be repeated here.

[0101] The present application also provides a method for manufacturing a solar cell, such as Fig.28 As shown, the manufacturing method includes: Step S101, providing a first substrate, forming a first battery on the first substrate, and forming a plurality of first bus bars and a plurality of first lead wires, wherein the first bus bar is electrically connected to the first battery, and one end of the first lead wire is connected to the first bus bar; Step S102, providing a second battery, placing the second battery on the first battery, and forming a plurality of second bus bars and at least one second lead wire, wherein the second bus bar is electrically connected to the second battery, and one end of the second lead wire is connected to the second bus bar; Step S103, providing a second substrate, setting the second substrate on the second battery, the second substrate having at least one through hole penetrating the second substrate, and leading the other end of the second lead wire out from the through hole; wherein, before setting the second substrate on the second battery, the other end of at least one first lead wire is connected to the second bus bar; and / or, after setting the second substrate on the second battery, the other end of at least one first lead wire is led out from the through hole, and the other end of the first lead wire and the other end of at least one second lead wire are led out from the same through hole.

[0102] The manufacturing method of the present application is further described in detail below in conjunction with the accompanying drawings; wherein: Fig.31 Before forming a second sealing layer and a second substrate on the second battery, Figure 3 A schematic diagram of the cross-sectional structure taken along the line connecting A and A'; Fig.32 Before forming a second sealing layer and a second substrate on the second battery, Fig.11 Schematic diagram of the cross-sectional structure taken by the line connecting A and A'.

[0103] First, if Fig.29 and Figure 8 As shown, step S101 is performed to provide a first substrate 101, form a first battery 11 on the first substrate 101, and form a plurality of first bus bars 13 and a plurality of first lead wires 14, wherein the first bus bar 13 is electrically connected to the first battery 11, and one end of the first lead wire 14 is connected to the first bus bar 13.

[0104] In some embodiments, the first battery 11 may include one or more first sub-batteries 12. When there are multiple first sub-batteries 12, the multiple first sub-batteries 12 may be connected in series, in parallel, or in mixed connection. Fig.29 As shown, in some embodiments, the first battery 11 includes a plurality of first sub-batteries 12 arranged along a third direction on the first substrate 101 and extending along a fourth direction intersecting (including perpendicular or oblique) the third direction, and the plurality of first sub-batteries 12 are sequentially connected in series along the third direction.

[0105] like Figure 8 As shown, in some embodiments, the first sub-cell 12 includes a first electrode layer 121, a functional layer 122 and a second electrode layer 123 stacked sequentially from bottom to top on the first substrate 101. The materials of the first electrode layer 121 and the second electrode layer 123 are as described above and will not be repeated here.

[0106] In some embodiments, the functional layer 122 includes a light absorbing layer 1222, which is located between the first electrode layer 121 and the second electrode layer 123; the light absorbing layer 1222 includes one or more of a perovskite light absorbing layer, an amorphous silicon light absorbing layer, a copper indium gallium selenide light absorbing layer, a cadmium telluride light absorbing layer, a gallium arsenide light absorbing layer, and an organic dye light absorbing layer, and the above light absorbing layer can be used to prepare a thin-film solar cell with a light absorbing layer thickness of micrometer or nanometer level to expand the application scenarios of the battery assembly. Further, the light absorbing layer 1222 can be a perovskite light absorbing layer, and the first battery 11 includes a perovskite solar cell.

[0107] In some embodiments, the functional layer 122 also includes a first transport layer 1221 located between the first electrode layer 121 and the light absorbing layer 1222, and / or a second transport layer 1223 located between the light absorbing layer 1222 and the second electrode layer 123, one of the first transport layer 1221 and the second transport layer 1223 is an electron transport layer, and the other is a hole transport layer. The provision of the electron transport layer and / or the hole transport layer helps to extract and transmit the electron-hole pairs generated by the light absorbing layer 1222 to the corresponding electrode, thereby improving the carrier transport capacity. According to actual conditions, the electron transport layer and the hole transport layer can be respectively provided on both sides of the light absorbing layer 1222, or one of the two can be selected on one side of the light absorbing layer 1222, such as only providing a hole transport layer, which is not limited here.

[0108] like Fig.29 As shown, in some embodiments, the number of the first bus bars 13 may be two, and the two first bus bars 13 may be connected to the positive electrode and the negative electrode of the first battery 11, respectively. In some embodiments, the first bus bar 13 is disposed on a surface of the first sub-battery 12 located at the edges of both sides of the first battery 11 along the third direction, which is away from the first substrate 101, and extends along the extension direction (fourth direction) of the first sub-battery 12, and the first bus bar 13 may be connected to the second electrode layer 123 of the first sub-battery 12 located at the edge along the third direction, respectively. However, it is not limited thereto, the number of the first bus bars 13 may be more, and the first bus bar 13 and the first battery 11 may also have other connection modes. Fig.29 The extending length of the first bus bar 13 in the fourth direction shown in FIG. 1 is the same as the extending length of the first battery 11 in the fourth direction, but the invention is not limited thereto. The extending length of the first bus bar 13 in the fourth direction may also be longer or shorter.

[0109] In some embodiments, the first lead wire 14 is disposed along the third direction at both side edges of the first battery 11 , one end of which is connected to the first bus bar 13 , and the other end of which extends to the middle area of ​​the first battery 11 .

[0110] In actual operation, the material of the first bus bar 13 may include a conductive tape to facilitate bonding with the first sub-battery 12, for example, it may be one or more of a conductive cloth-based tape, a conductive rubber tape, a conductive copper tape, etc.; the material of the first lead wire 14 may include one or more of copper, aluminum, silver, gold, tin-plated copper or its alloy, etc. However, it is not limited thereto, the material of the first bus bar 13 may also be the same as the material of the first lead wire 14, and the first bus bar 13 and the first lead wire 14 may also be formed integrally.

[0111] Next, step S102 is performed to provide a second battery 15 (see Fig. 9 ), the second battery 15 is placed on the first battery 11, and a plurality of second bus bars 17 and at least one second lead wire 18 are formed, the second bus bar 17 is electrically connected to the second battery 15, and one end of the second lead wire 18 is connected to the second bus bar 17, forming a Figure 3 , Figure 4 and Fig.31 The structure shown.

[0112] In some embodiments, the second cell 15 may be a crystalline silicon solar cell, and the front side of the second cell 15 may be arranged toward the first cell 11 .

[0113] In some embodiments, the second battery 15 may include one battery pack 151 or a plurality of battery packs 151 distributed at intervals; Fig. 9 As shown, in the case where there are multiple battery groups 151, the multiple battery groups 151 may include first battery groups Z1 and second battery groups Z2 that are spaced and arranged adjacent to each other along a first direction parallel to the plane of the first substrate 101, and at least one second bus bar 17 is located between the first battery group Z1 and the second battery group Z2; but not limited to this, as Fig.24 and Fig. 27 As shown, at least one second bus bar 17 can also be arranged along the first direction on at least one side of the second battery 15. In this way, in the vertical direction, the second battery 15 will not block or hinder the second bus bar 17, which is convenient for the subsequent leading out of the first lead wire 14 from below the plane where the second battery 15 is located, thereby facilitating the connection of the first lead wire 14 with the second bus bar 17, or leading the first lead wire 14 from the through hole S3, and avoiding the first lead wire 14 from blocking the second battery 15 from light.

[0114] like Fig. 9As shown, in some embodiments, each battery group 151 may include a plurality of battery string groups 152 (for example, 3) arranged along the second direction and connected in series, any battery string group 152 may include a plurality of battery strings 153 (for example, two) arranged along the second direction and connected in series, each battery string 153 may include a plurality of second sub-batteries 16 arranged along the first direction and connected in series, and the second sub-batteries 16 may be a whole cell or a half cell, etc.

[0115] Here, the first direction and the second direction intersect and are both parallel to the plane of the first substrate 101 , and the first direction may be the same as the extension direction of the first sub-battery 12 (ie, the fourth direction), and the second direction may be the same as the arrangement direction of the plurality of first sub-batteries 12 (ie, the third direction).

[0116] In some embodiments, the second sub-battery 16 may include a third electrode layer (not shown) located on a side of the second sub-battery 16 facing the first battery 11, and a fourth electrode layer (not shown) located on a side of the second sub-battery 16 facing away from the first battery 11. The third electrode layer may be the negative electrode or positive electrode of the second sub-battery 16, and the fourth electrode layer may be the positive electrode or negative electrode of the second sub-battery 16. In some embodiments, the battery assembly further includes: a plurality of interconnecting bars 19, and the positive electrode or negative electrode of one of the two adjacent second sub-batteries 16 in each battery string 153 is electrically connected to the negative electrode or positive electrode of the other through the interconnecting bars 19, so that a plurality of second sub-batteries 16 in any battery string 153 are connected in series along the first direction.

[0117] like Fig. 9 As shown, in some embodiments, when the second battery 15 includes a first battery group Z1 and a second battery group Z2, the second sub-battery 16 can be a half-cell battery sheet, and a plurality of second bus bars 17 can be disposed between the first battery group Z1 and the second battery group Z2 and arranged at intervals along the second direction, and a plurality of battery string groups 152 of the first battery group Z1 and a plurality of battery string groups 152 of the second battery group Z2 are connected in parallel through the second bus bar 17, and two battery string groups 152 adjacent to each other in the second direction in any battery group 151 are connected in series through the second bus bar 17, and the two second bus bars 17 located at the edge along the second direction are electrically connected to the positive and negative electrodes of the second battery 15, respectively.

[0118] But not limited to this, such as Fig.24 and Fig. 27As shown, in some other embodiments of the present application, a plurality of second bus bars 17 may also be located on one side of the second battery 15 along the first direction and arranged at intervals along the second direction, and the second battery 15 may include a battery group 151, the second sub-battery 16 in the battery group 151 may be a whole battery cell, two adjacent battery string groups 152 in the second direction are connected in series through the second bus bar 17, and the two second bus bars 17 located at the edge along the second direction are electrically connected to the positive and negative electrodes of the second battery 15, respectively.

[0119] In some embodiments, the battery assembly may further include: a plurality of third bus bars 21, which are located along the first direction on a side of any battery group 151 away from the plurality of second bus bars 17, and the battery strings 153 of the battery string group 152 are connected in series through the third bus bars 21. In actual operation, the second bus bar 17 and the third bus bar 21 may be electrically connected to the positive electrode or negative electrode of the corresponding second sub-battery 16 through a plurality of interconnection bars 19.

[0120] In actual operation, first of all, Fig. 9 As shown, a plurality of second sub-cells 16 are arranged and welded to the second bus bar 17, the interconnection bar 19 and the third bus bar 21. Then, the second cell 15 is placed on the first cell 11 to form a Figure 3 , Figure 4 and Fig.31 The second bus bar 17 , the interconnection bar 19 and the third bus bar 21 may be made of one or more materials including copper, aluminum, silver, gold, tinned copper or alloys thereof.

[0121] Continue to see Fig. 9 In actual operation, at least one second lead wire 18 may be formed before or after the second battery 15 is placed on the first battery 11, and one end of the second lead wire 18 is electrically connected to the second bus bar 17. The number of second lead wires 18 may also be multiple, and the second bus bars 17 extend along the second direction and are arranged at intervals along the second direction. The two ends of any two adjacent second bus bars 17 close to each other are respectively electrically connected to one end of the second lead wire 18, and the other end of the second lead wire 18 connected to the two ends close to each other can be subsequently led out from the same through hole S3 and introduced into the same junction box.

[0122] In actual operation, the second lead wire 18 and the second bus bar 17 may be welded, or the second lead wire 18 and the second bus bar 17 may be formed integrally.

[0123] like Fig.30As shown, in some embodiments, before placing the second battery 15 on the first battery 11, the direction further includes: forming a first sealing layer 23, the first sealing layer 23 is located on the side of the second battery 15 and the second bus bar 17 facing the first battery 11, and covers at least a portion of the first battery 11. The first sealing layer 23 is used to electrically isolate the first battery 11 from the second battery 15. In some embodiments, the orthographic projections of the second battery 15 and the second bus bar 17 on the plane of the first substrate 101 fall within the orthographic projections of the first sealing layer 23 on the plane of the first substrate 101, and the edge of the first sealing layer 23 may slightly protrude outward from the edge of the second battery 15 to increase the isolation effect of the first sealing layer 23.

[0124] Next, step S103 is performed to provide a second substrate 102, and the second substrate 102 is disposed on the second battery 15. The second substrate 102 has at least one through hole S3 penetrating the second substrate 102, and the other end of the second lead wire 18 is led out from the through hole S3 to form a Figure 5 and Figure 6 The structure shown.

[0125] In this way, the first battery 11 and the second battery 15 are encapsulated between the first substrate 101 and the second substrate 102. In some embodiments, the materials of the first substrate 101 and the second substrate 102 may be the same or different. In some embodiments, the first substrate 101 and the second substrate 102 include an inorganic substrate made of quartz, sapphire, glass, etc., and a transparent plastic substrate made of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, polyethylene, polypropylene, polyphenylene sulfide, polyvinylidene fluoride, tetraacetyl cellulose, brominated phenoxy, aromatic polyamide, polyimide, polystyrene, polyarylate, polysulfone, polyolefin, etc. In a specific embodiment, the first substrate 101 and the second substrate 102 may both be glass substrates.

[0126] In some embodiments, before the second substrate 102 is disposed on the second battery 15 , the other end of the at least one first lead-out line 14 is connected to the second bus bar 17 .

[0127] For details, see again Fig.30 In some embodiments, the first sealing layer 23 also covers at least a portion of the first lead wire 14; the method further includes: forming an opening S1 on the first sealing layer 23 that penetrates the first sealing layer 23; again referring to Fig.30 , Figure 3 , Figure 4 as well as Fig.31, connecting at least one first bus bar 13 with the second bus bar 17, including: leading one end of at least one first lead wire 14 away from the first bus bar 13 out of the opening S1 and connecting it to the second bus bar 17, that is, part of the first lead wire 14 passes through the opening S1, is laid on the side of the first sealing layer 23 away from the first substrate 101 and connected to the second bus bar 17. In this way, at least one first bus bar 13 and the second bus bar 17 are interconnected inside the battery assembly.

[0128] In actual operation, first of all, Fig.30 Before placing the second battery 15 on the first sealing layer 23, at least one end of the first lead wire 14 away from the first bus bar 13 may be led out from the opening S1; then, after placing the second battery 15 on the first sealing layer 23, the end of the first lead wire 14 away from the first bus bar 13 may be connected to the second bus bar 17 to form a Figure 3 , Figure 4 as well as Fig.31 The structure shown.

[0129] In actual operation, the end of the first lead wire 14 away from the first bus bar 13 can be overlapped on the upper surface or side surface of the second bus bar 17 and welded thereto. However, the present invention is not limited thereto, and the end of the first lead wire 14 away from the first bus bar 13 can also be welded to the lower surface of the second bus bar 17. In some embodiments, the second lead wire 18 can also be welded to the first lead wire 14 and connected to the second bus bar 17.

[0130] In some embodiments, two first lead-out lines 14 are respectively arranged at the two side edges of the first battery 11 along the second direction and extend to the middle area of ​​the first battery 11, and the two first lead-out lines 14 are respectively connected to the two second bus bars 17 located at the edges along the second direction to realize parallel connection of the first battery 11 and the second battery 15 inside the battery assembly.

[0131] Figure 5 The opening S1 shown in the figure is located on both sides of the plurality of second bus bars 17 along the second direction. However, the present invention is not limited thereto, and the opening S1 may also be located between two adjacent second bus bars 17, and the end of the first lead wire 14 away from the first bus bar 13 may also be connected to other second bus bars 17 located between two second bus bars 17 at the edge along the second direction.

[0132] In some embodiments of the present application, a first bus bar 13 electrically connected to the first battery 11 and a second bus bar 17 electrically connected to the second battery 15 are located inside the battery assembly, and at least one of the first bus bar 13 and the second bus bar 17 are electrically connected inside the battery assembly through a first lead wire 14. In this way, for the first bus bar 13 electrically connected to the second bus bar 17, there is no need to additionally set up lead wires that need to be led out of the assembly to be connected separately thereto, and there is no need to make additional holes on the second substrate 102 to lead out the lead wires that are separately connected to the first bus bar 13, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of laminated battery assemblies.

[0133] Fig.31 as well as Figures 3 to 5 The end of at least one first lead wire 14 led out from the opening S1 is connected to the second bus bar 17, so that the at least one first bus bar 13 and the second bus bar 17 are electrically connected inside the component.

[0134] But not limited to this, in some embodiments, the method also includes: leading out one end of at least one first lead-out wire 14 away from the first bus bar 13 from the through hole S3, and leading out one end of the first lead-out wire 14 away from the first bus bar 13 and one end of at least one second lead-out wire 18 away from the second bus bar 17 from the same through hole S3, so that at least one first bus bar 13 and the second bus bar 17 are independently arranged inside the battery assembly.

[0135] Specifically, leading the other end of the at least one first lead-out wire 14 out from the through hole S3 includes: leading one end of the at least one first lead-out wire 14 away from the first bus bar 13 out from the opening S1 and the through hole S3 .

[0136] In actual operation, first, after one end of the first lead wire 14 away from the first bus bar 13 is led out from the opening S1 of the first sealing layer 23, the second battery 15 is placed on the first battery 11; then, one end of at least one first lead wire 14 away from the first bus bar 13 is led out from the opening S1 to form a Figure 11 to Figure 12 as well as Fig.32 Next, the second substrate 102 is placed on the second battery 15, and the first lead wire 14 is led out from the opening S1 at one end through the through hole S3 to form a Fig.13 The structure shown.

[0137] In some embodiments of the present application, at least one first lead-out wire 14 at one end away from the first bus bar 13 and at least one second lead-out wire 18 at one end away from the second bus bar 17 are led out from the same through hole S3. In this way, there is no need to punch additional holes to lead out the first lead-out wire 14 separately, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of laminated battery assemblies.

[0138] In some embodiments of the present application, at least one first lead-out wire 14 at one end away from the first bus bar 13 and at least one second lead-out wire 18 at one end away from the second bus bar 17 are led out from the same through hole S3. In this way, there is no need to punch additional holes to lead out the first lead-out wire 14 separately, thereby improving the mechanical properties of the battery assembly and simplifying the manufacturing process of the battery assembly, which is conducive to the rapid mass production of laminated battery assemblies.

[0139] In some embodiments, the opening S1 can be located between two adjacent second bus bars 17, and the ends of the two adjacent second bus bars 17 near the opening S1 are respectively connected to the second lead wire 18, and the other end of the first lead wire 14 led out from the opening S1 and the other end of the second lead wire 18 connected to the end of the second bus bar 17 near the opening S1 are led out from the same through hole S3, so that the first lead wire 14 and the two adjacent second lead wires 18 are led out from the same through hole S3 and can be introduced into the same junction box, further reducing the number of holes punched in the second substrate 102 and simplifying the battery assembly manufacturing process. Among them, the first lead wire 14 leading out of the battery assembly can be connected to the second lead wire 18, or it can be set independently from the second lead wire 18.

[0140] like Figures 11 to 14 As shown, in some embodiments, the number of the first lead-out wires 14 is two, one end of the two first lead-out wires 14 is electrically connected to the positive electrode and the negative electrode of the first battery 11 respectively through the first bus bar 13, and the other end is led out from different through holes S3 respectively, so that the circuit of the first battery 11 and the circuit of the second battery 15 are independently arranged inside the component.

[0141] But not limited to this, in some embodiments, the other end of part of the first lead-out line 14 can also be connected to the second bus bar 17, and the other end of part of the first lead-out line 14 can be led out from the through hole S3, which can be used to realize series connection, parallel connection or mixed connection of multiple first sub-batteries 12 and multiple second sub-batteries 16.

[0142] See again Fig.29 In some embodiments, the first lead 14 includes a first sub-portion 141; in some embodiments, the method further includes: forming a first insulating layer 22, the first insulating layer 22 is located on a side of the first sub-portion 141 facing the first battery 11, and at least covers a portion of the first battery 11 covered by the first sub-portion 141; Fig.31 and Fig.32 As shown, after leading out one end of at least one first lead-out wire 14 away from the first bus bar 13 from the opening S1, the first sub-portion 141 is located on the side of the first sealing layer 23 facing the first substrate 101, and the first insulating layer 22 is located between the first sub-portion 141 and the first battery 11, so that the first insulating layer 22 electrically isolates the first lead-out wire 14 and the first battery 11 to avoid the risk of short circuit.

[0143] In some embodiments, the first sub-portion 141 and the first insulating layer 22 may extend in a straight line along a third direction, but not limited thereto, the first sub-portion 141 and the first insulating layer 22 may also extend in a straight line along other directions, or along a curve or a fold line to increase the applicability of scenarios.

[0144] However, the present invention is not limited to this, and the first lead-out line 14 may also not be provided with the first sub-portion 141, and the opening S1 may be located above the first bus bar 13, one end of the first lead-out line 14 is located in the opening S1 and connected to the first bus bar 13 located below the opening S1, and the other end is located on the side of the first sealing layer 23 away from the first battery 11, and is connected to the second bus bar 17 or is led out from the through hole S3. In this way, the first lead-out line 14 is separated from the first battery 11 by the first sealing layer 23, and there is no need to additionally provide the first insulating layer 22.

[0145] like Fig.30 As shown, in some embodiments, the first sealing layer 23 may completely cover the first battery 11, the first bus bar 13 and the first sub-portion 141, and the side wall of the first sealing layer 23 may be substantially flush with the side wall of the first battery 11, or protrude outward from the side wall of the first battery 11. However, it is not limited thereto, the first sealing layer 23 may also cover part of the first battery 11, and in the second direction, at least one side edge of the first sealing layer 23 may be indented inwardly relative to the edge of the first battery 11, and the first sealing layer 23 may cover part of the first bus bar or part of the first sub-portion 141.

[0146] See again Figure 5 and Figure 6 as well as Fig.13 In some embodiments, after placing the second battery 15 on the first battery 11 and before placing the second substrate 102 on the second battery 15, the method further includes: forming a second sealing layer 24, the second sealing layer 24 is located between the second battery 15 and the second substrate 102, and covers the first battery 11, the second battery 15, the first bus bar 13 and the second bus bar 17, the first lead wire 14 and / or the second lead wire 18 penetrates the second sealing layer 24 in a vertical direction and leads out from the through hole S3.

[0147] The materials of the first sealing layer 23 and the second sealing layer 24 are as described above and will not be described again.

[0148] Continue to see Figure 5 and Figure 6 as well as Fig.13 In some embodiments, the edges of the first battery 11 and the second battery 15 are indented relative to the edges of the first substrate 101 and the second substrate 102; before placing the second substrate 102 on the second battery 15, the method further includes: forming a third sealing layer 25, the third sealing layer 25 is arranged along the edges of the first substrate 101 and the second substrate 102, and the second substrate 102 and the first substrate 101 are sealed and connected through the third sealing layer 25. The material of the third sealing layer 25 includes but is not limited to butyl rubber.

[0149] like Fig.33 As shown, in some other embodiments of the present application, at least one side edge of the first sealing layer 23 has a notch S2, at least part of the first bus bar 13 is exposed by the notch S2, and one end of at least one first lead wire 14 is connected to the first bus bar 13 exposed by the notch S2. Fig.33 The structure shown in FIG. 1 executes step S102 and step S103 to form the following Figures 15 to 17 The structure shown in FIG. 1 is a structure in which the other end of at least one first lead wire 14 is connected to the second bus bar 17, including: leading the first lead wire 14 out from the notch S2, laying it on the surface of the first sealing layer 23 away from the first battery 11, and connecting one end of the first lead wire 14 away from the notch S2 to the second bus bar 17. In this way, there is no need to form an opening S1 in the first sealing layer 23, and the process of inserting the first lead wire 14 through the opening S1 is omitted. The first lead wire 14 is separated from the first battery 11 by the first sealing layer 23, and there is no need to set the first insulating layer 22, which further simplifies the manufacturing process of the battery assembly.

[0150] In some embodiments, the first bus bar 13 may be formed first, and then a first sealing layer 23 having a notch S2 exposing the first bus bar 13 may be formed, and then a first lead wire 14 having one end connected to the first bus bar 13 exposed by the notch S2 may be formed on the first sealing layer 23 .

[0151] In some embodiments, the notch S2 is located at both side edges of the first sealing layer 23 along the second direction, the first lead wire 14 extends toward the middle area of ​​the first battery 11 along the second direction, and is connected to the second bus bar 17 located at the edge along the second direction.

[0152] In actual operation, the first bus bar 13 may be a structure that extends continuously along the fourth direction below the first sealing layer 23, and only a portion of the first bus bar 13 is exposed by the notch S2. However, the first bus bar 13 may also be a structure that is disposed in the notch S2 and has a shorter extension length.

[0153] like Fig.34 as well as Figures 18 to 20 As shown, in some other embodiments of the present application, in the second direction, at least one side edge of the first sealing layer 23 can also be retracted inward relative to the edge of the first battery 11, and at least one first bus bar 13 is located at at least one side of the first sealing layer 23 along the second direction and is spaced from the first sealing layer 23; the manufacturing method also includes: forming a second insulating layer 26, the second insulating layer 26 is located between the first bus bar 13 and the first sealing layer 23 and covers part of the first battery 11, at least one first lead wire 14 is formed on the second insulating layer 26 and the first sealing layer 23 on the side surface away from the first battery 11, one end is connected to the first bus bar 13 located at at least one side of the first sealing layer 23 along the second direction, and the other end is connected to the second bus bar 17. In this way, there is no need to form an opening S1 in the first sealing layer 23, and the process of inserting the first lead wire 14 from the opening S1 is omitted, which further simplifies the manufacturing process of the battery assembly, and the first lead wire 14 is spaced from the first battery 11 by the first sealing layer 23 and the second insulating layer 26, thereby avoiding the risk of short circuit.

[0154] Specifically, Fig.34 As shown, before or after forming the first sealing layer 23, a first bus bar 13 located at at least one side of the first sealing layer 23 along the second direction and a first lead wire 14 connected to the first bus bar 13 can be formed, and a second insulating layer 26 can be formed under a portion of the first lead wire 14; then, Fig.34 The structure shown in FIG. 1 executes step S102 and step S103 to form Figures 18 to 20 The structure shown.

[0155] In some embodiments, in the second direction, both side edges of the first sealing layer 23 are indented inward relative to the edge of the first battery 11, the two first bus bars 13 are located on both sides of the first sealing layer 23 along the second direction, and the two first lead wires 14 are respectively connected to the second bus bars 17 located on the two side edges along the second direction.

[0156] like Fig.35 as well as Figure 21 to Figure 23As shown, in some embodiments, at least one first bus bar 13 is located on at least one side of the first sealing layer 23 along the second direction and contacts the first sealing layer 23, and at least one first lead wire 14 is formed on the side of the first sealing layer 23 away from the first battery 11, with one end connected to the first bus bar 13 located on one side of the first sealing layer 23 along the second direction, and the other end connected to the second bus bar 17; in this way, there is no need to form an opening S1 in the first sealing layer 23, and the process of inserting the first lead wire 14 through the opening S1 is omitted, and the first lead wire 14 is separated from the first battery 11 by the first sealing layer 23, and there is no need to additionally set the second insulating layer 26, which further simplifies the manufacturing process of the battery assembly.

[0157] Specifically, Fig.35 As shown, before or after forming the first sealing layer 23, a first bus bar 13 located at at least one side of the first sealing layer 23 along the second direction and a first lead wire 14 connected to the first bus bar 13 can be formed. Fig.35 The structure shown in FIG. 1 executes step S102 and step S103 to form Figure 21 to Figure 23 The structure shown.

[0158] Figures 3 to 5 , Figures 15 to 17 , Figures 18 to 20 as well as Figure 21 to Figure 23 The structure shown provides different connection methods for the first bus bar 13 and the second bus bar 17 respectively. Any first bus bar 13 can be connected to the second bus bar 17 in any method, and multiple first bus bars 13 can be connected to the second bus bar 17 in the same or different methods.

[0159] Figures 3 to 23 In the battery assembly shown, the plurality of second bus bars 17 and the first lead wires 14 are located in the middle area of ​​the battery assembly. Fig.24 and Fig. 27 As shown, in some other embodiments of the present application, the plurality of second bus bars 17 and the first lead wires 14 may also be located in the end region of the battery assembly in the first direction.

[0160] Specifically, Figures 3 to 23 As shown, in some embodiments, when the plurality of second bus bars 17 are located between the first battery group Z1 and the second battery group Z2, the orthographic projection of the first lead wire 14 on the plane where the second battery 15 is located is located between the first battery group Z1 and the second battery group Z2. Fig.24 and Fig. 27As shown, in the case where a plurality of second bus bars 17 are arranged along the first direction on one side of the second battery 15 in the first direction, the orthographic projection of the first lead wire 14 on the plane where the second battery 15 is located is located on the same side of the second battery 15 in the first direction as the second bus bar 17. That is, in the present application, the first lead wire 14 and the second bus bar 17 are arranged in the same area of ​​the battery assembly, so that it is convenient to lead the first lead wire 14 to the vicinity of the second bus bar 17, so as to facilitate its connection with the second bus bar 17, or to facilitate the first lead wire 14 and the second lead wire 18 connected to the second bus bar 17 from the same through hole S3, thereby reducing the process complexity of the first lead wire 14 and simplifying the manufacturing process of the battery assembly.

[0161] Fig.25 The first lead wire 14 shown in the figure is located on the side of the first battery 11 away from the first substrate 101 , and the orthographic projection of the first lead wire 14 on the plane of the first substrate 101 falls within the orthographic projection of the first battery 11 on the plane of the first substrate 101 .

[0162] However, the present invention is not limited thereto, and the first lead wire 14 may also be disposed at other locations. Fig.26 As shown, in some other embodiments of the present application, the first lead wire 14 is arranged on one side of the first battery 11 along the first direction, and part of the first bus bar 13 protrudes from the edge of the first battery 11 along the first direction and is connected to the first lead wire 14 .

[0163] In some embodiments of the present application, when multiple second bus bars 17 and the first lead wire 14 are located in the end area of ​​the battery assembly in the first direction, the end of the first lead wire 14 away from the first bus bar 13 can be connected to the second bus bar 17 or led out from the through hole S3 in the same manner as described above, which will not be repeated here.

[0164] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery assembly, characterized in that: include: a first substrate, a second substrate located on the first substrate, a first battery located between the first substrate and the second substrate, and a second battery located between the first battery and the second substrate; The second substrate has at least one through hole penetrating the second substrate; a plurality of first bus bars electrically connected to the first battery and a plurality of second bus bars electrically connected to the second battery, located between the first substrate and the second substrate; A plurality of first lead wires, one end of each of the first lead wires being connected to the first bus bar; at least one second lead wire, one end of the second lead wire is connected to the second bus bar, and the other end is led out from the through hole; wherein, The other end of at least one of the first lead wires is connected to the second bus bar, and the orthographic projection of the first lead wire on the plane where the second battery is located and the second bus bar are located on the same side of the second battery in the first direction, or the second battery includes a first battery group and a second battery group arranged at intervals along the first direction, and the orthographic projection of the first lead wire on the plane where the second battery is located and the second bus bar are located between the first battery group and the second battery group; the first direction is parallel to the plane of the first substrate; and / or, The other end of at least one of the first lead wires is led out from the through hole, and the other end of the first lead wire and the other end of at least one of the second lead wires are led out from the same through hole.

2. The battery assembly according to claim 1, characterized in that: In the case where the other end of at least one of the first lead wires is led out from the through hole, at least one of the second bus bars is arranged on at least one side of the second battery along a first direction parallel to the plane of the first substrate; or, the second battery includes a first battery group and a second battery group arranged at intervals along a first direction parallel to the plane of the first substrate, and at least one of the second bus bars is located between the first battery group and the second battery group; The battery assembly further includes a first sealing layer, which is located on a side of the second battery and the second bus bar facing the first battery and covers at least a portion of the first battery.

3. The battery assembly according to claim 2, characterized in that: The first sealing layer has at least one opening penetrating through the first sealing layer; wherein, One end of at least one of the first lead wires is connected to the first bus bar, and the other end is led out from the opening and connected to the second bus bar; and / or, One end of at least one of the first lead wires is connected to the first bus bar, and the other end thereof is led out from the opening and the through hole.

4. The battery assembly according to claim 3, characterized in that: At least one of the first lead wires includes a first sub-portion, the first sub-portion is located on a side of the first sealing layer facing the first substrate and connected to the first bus bar, and the first sub-portion covers a portion of the first battery; The battery assembly further includes a first insulating layer, which is located on a side of the first sub-portion facing the first battery and covers at least a portion of the first battery covered by the first sub-portion.

5. The battery assembly according to claim 3 or 4, characterized in that: A plurality of second bus bars extend along a second direction and are arranged at intervals along the second direction, the opening is located between two adjacent second bus bars, the ends of two adjacent second bus bars close to the opening are connected to the second lead wire, the other end of the second lead wire led out from the opening and the other end of the first lead wire connected to the end of the second bus bar close to the opening are led out from the same through hole; the second direction intersects with the first direction and are both parallel to the first substrate plane.

6. The battery assembly according to claim 2, characterized in that: In the second direction, at least one side edge of the first sealing layer has a notch, at least part of the first bus bar is exposed by the notch, at least one first lead-out line is located on a side surface of the first sealing layer away from the first battery, one end is connected to the first bus bar exposed by the notch, and the other end is connected to the second bus bar; the second direction intersects with the first direction and is parallel to the first substrate plane.

7. The battery assembly according to claim 2, characterized in that: At least one of the first bus bars is located at at least one side of the first sealing layer along a second direction and is spaced apart from the first sealing layer, wherein the second direction intersects the first direction and is parallel to the first substrate plane; The battery assembly further comprises: a second insulating layer, wherein the second insulating layer is located between the first bus bar and the first sealing layer and covers a portion of the first battery, at least one of the first lead wires is located on a side of the first sealing layer and the second insulating layer away from the first battery, one end of the lead wire is connected to the first bus bar located on one side of the first sealing layer along the second direction, and the other end of the lead wire is connected to the second bus bar.

8. The battery assembly according to claim 2, characterized in that: At least one of the first bus bars is located on at least one side of the first sealing layer along the second direction and contacts the first sealing layer, at least one of the first lead wires is located on a side of the first sealing layer away from the first battery, one end of the lead wire is connected to the first bus bar located on one side of the first sealing layer along the second direction, and the other end of the lead wire is connected to the second bus bar; the second direction intersects with the first direction and is parallel to the first substrate plane.

9. The battery assembly according to claim 2, characterized in that: A plurality of the second bus bars are arranged on one side of the second battery along the first direction and are arranged at intervals along the second direction; when the other end of at least one of the first lead wires is led out from the through hole, the orthographic projection of the first lead wire on the plane where the second battery is located and the second bus bar are located on the same side of the second battery in the first direction; or, A plurality of the second bus bars are disposed between the first battery group and the second battery group and are arranged at intervals along the second direction; When the other end of at least one of the first lead wires is led out from the through hole, the orthographic projection of the first lead wire on the plane where the second battery is located is located between the first battery group and the second battery group; the second direction intersects the first direction and is parallel to the first substrate plane.

10. The battery assembly according to claim 2, characterized in that: The first cell comprises a thin film solar cell, the thin film solar cell comprises a light absorption layer, the light absorption layer comprises one or more of a perovskite light absorption layer, an amorphous silicon light absorption layer, a copper indium gallium selenide light absorption layer, a cadmium telluride light absorption layer, a gallium arsenide light absorption layer, and an organic dye light absorption layer; and / or the second cell comprises a crystalline silicon solar cell.

11. A method for manufacturing a battery assembly, characterized in that: include: Providing a first substrate, forming a first battery on the first substrate, and forming a plurality of first bus bars and a plurality of first lead wires, wherein the first bus bar is electrically connected to the first battery, and one end of the first lead wire is connected to the first bus bar; Providing a second battery, placing the second battery on the first battery, and forming a plurality of second bus bars and at least one second lead wire, wherein the second bus bar is electrically connected to the second battery, and one end of the second lead wire is connected to the second bus bar; A second substrate is provided, and the second substrate is disposed on the second battery, wherein the second substrate has at least one through hole penetrating the second substrate, and the other end of the second lead wire is led out from the through hole; wherein, Before the second substrate is disposed on the second battery, the other end of at least one of the first lead wires is connected to the second bus bar, and the orthographic projection of the first lead wire on the plane where the second battery is located and the second bus bar are both located on the same side of the second battery in the first direction, or the second battery includes a first battery group and a second battery group arranged at intervals along the first direction, and the orthographic projection of the first lead wire on the plane where the second battery is located and the second bus bar are both located between the first battery group and the second battery group; the first direction is parallel to the plane of the first substrate; and / or, After the second substrate is disposed on the second battery, the other end of at least one of the first lead wires is led out from the through hole, and the other end of the first lead wire and the other end of at least one of the second lead wires are led out from the same through hole.

12. The manufacturing method according to claim 11, characterized in that: In the case where the other end of at least one of the first lead wires is led out from the through hole, at least one of the second bus bars is arranged on at least one side of the second battery along a first direction parallel to the plane of the first substrate; or, the second battery includes a first battery group and a second battery group arranged at intervals along a first direction parallel to the plane of the first substrate, and at least one of the second bus bars is located between the first battery group and the second battery group; Before placing the second battery on the first battery, the direction further includes: forming a first sealing layer, wherein the first sealing layer is located on a side of the second battery and the second bus bar facing the first battery and covers at least a portion of the first battery.

13. The manufacturing method according to claim 12, characterized in that: The first sealing layer also covers at least a portion of the first lead-out line, and an opening penetrating the first sealing layer is formed on the first sealing layer; Connecting the other end of at least one of the first lead wires to the second bus bar comprises: leading one end of the first lead wire away from the first bus bar out of the opening and connecting it to the second bus bar; and / or, Leading out the other end of at least one of the first lead-out wires from the through hole includes: leading out one end of the first lead-out wire away from the first bus bar from the opening and the through hole.

14. The manufacturing method according to claim 13, characterized in that: At least one of said first leads comprises a first sub-portion; Before forming the first sealing layer, the method also includes: forming a first insulating layer, the first insulating layer is located on the side of the first sub-portion facing the first battery and covers at least a portion of the first battery covered by the first sub-portion, and after leading out one end of the first lead wire away from the first bus bar from the opening, the first sub-portion and the first insulating layer are located on the side of the first sealing layer facing the first substrate.

15. The manufacturing method according to any one of claims 12 to 14, characterized in that: Along the second direction, a notch is formed on at least one side edge of the first sealing layer, at least a portion of the first bus bar is exposed by the notch, and one end of at least one of the first lead wires is connected to the first bus bar exposed by the notch; Connecting the other end of at least one of the first lead wires to the second bus bar includes: leading the first lead wire out from the notch, laying it on a surface of the first sealing layer away from the first battery, and connecting one end of the first lead wire away from the notch to the second bus bar.

16. The manufacturing method according to claim 12, characterized in that: At least one of the first bus bars is located at at least one side of the first sealing layer along a second direction and is spaced apart from the first sealing layer, the second direction intersects the first direction and is parallel to the first substrate plane; the method further includes: A second insulating layer is formed, wherein the second insulating layer is located between the first bus bar and the first sealing layer and covers a portion of the first battery, and at least one first lead wire is formed on a side of the first sealing layer and the second insulating layer away from the first battery, one end of the first lead wire is connected to the first bus bar located on one side of the first sealing layer along the second direction, and the other end is connected to the second bus bar.

17. The manufacturing method according to claim 12, characterized in that: At least one of the first bus bars is located on at least one side of the first sealing layer along the second direction and contacts the first sealing layer, at least the first lead wire is formed on the side of the first sealing layer away from the first battery, one end is connected to the first bus bar located on one side of the first sealing layer along the second direction, and the other end is connected to the second bus bar; the second direction intersects with the first direction and is parallel to the first substrate plane.

18. An electrical device, characterized in that: The electrical device comprises the battery assembly according to any one of claims 1 to 10 for providing electrical energy.

19. A power generation device, characterized in that: The power generation device comprises the battery assembly according to any one of claims 1 to 10.

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