Battery assembly and manufacturing method therefor, electric device, and power generation device

Abstract

Disclosed in the present invention are a battery assembly and a manufacturing method therefor, an electric device, and a power generation device. The battery assembly comprises: a first substrate, a second substrate located on the first substrate, and a battery encapsulated between the first substrate and the second substrate, wherein at least one through hole running through the second substrate is formed in the second substrate; at least one busbar, wherein the busbar has one end electrically connected to the battery, and the other end led out through the through hole; a first sealing layer located above the second substrate and the through hole, wherein the first sealing layer surrounds part of the busbar; and a second sealing layer located on the side of the first sealing layer distant from the second substrate, wherein the part of the busbar located above the first sealing layer at least comprises a first sub-portion and a second sub-portion which are sequentially connected, the first sub-portion is sandwiched between the first sealing layer and the second sealing layer, and at least part of the second sub-portion is laid on the side wall of the second sealing layer or surrounded by the second sealing layer.

Description

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

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410954486.6, filed on July 16, 2024, entitled "Battery assembly and manufacturing method thereof, power consumption device and power generation device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery assembly and manufacturing method thereof, a power consumption device and a power generation device. BACKGROUND

[0004] The structure of a photovoltaic assembly generally comprises, from bottom to top, a front plate glass, a solar cell, a back plate glass, and a busbar connected to the solar cell, a through hole is formed on the back plate glass, and the busbar is led out from the through hole, thereby leading out the current generated by the solar cell.

[0005] However, the water resistance of the current waterproof structure of the photovoltaic assembly is limited, and water vapor can easily enter the interior of the photovoltaic assembly through the through hole, causing water vapor corrosion to the solar cell, thereby affecting the output power of the photovoltaic assembly, and even causing safety hazards. SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery assembly to improve the waterproof performance at the position of the through hole of the second substrate, reduce the entry of water vapor into the interior of the battery assembly, and thereby reduce the corrosion of the battery located in the interior of the battery assembly by water vapor.

[0007] The present disclosure is implemented by the following technical solutions.

[0008] The first aspect of the present disclosure provides a battery assembly, comprising: a first substrate, a second substrate located on the first substrate, and a battery encapsulated between the first substrate and the second substrate; wherein the second substrate has at least one through hole penetrating the second substrate; at least one busbar, one end of the busbar being electrically connected to the battery, and the other end being led out from the through hole; a first sealing layer located above the second substrate and the through hole, the first sealing layer being arranged around part of the busbar; a second sealing layer located on the side of the first sealing layer away from the second substrate; wherein the part of the busbar located above the first sealing layer at least comprises a first sub-portion and a second sub-portion connected in sequence, the first sub-portion being sandwiched between the first sealing layer and the second sealing layer, and at least part of the second sub-portion being laid on the side wall of the second sealing layer or surrounded by the second sealing layer.

[0009] In the present disclosure, the first sub-portion of the bus bar is clamped between the first sealing layer and the second sealing layer, and at least part of the second sub-portion is laid on the side wall of the second sealing layer or surrounded by the second sealing layer. The first sealing layer and the second sealing layer play a good sealing role on the through hole, and the first sub-portion is laid on the surface of the first sealing layer. The extension direction of the first sub-portion is different from the extension direction of the second sub-portion and the part of the bus bar located in the through hole. The length of the channel through which the water vapor enters the battery assembly is increased, thereby reducing the water vapor entering. In addition, the present disclosure does not need to set a butyl rubber gasket in the through hole and on the lower surface of the second substrate (i.e. the side of the second substrate close to the battery), which helps to reduce the lamination pressure on the internal film layer of the battery during the lamination process of the battery assembly, thereby reducing the damage to the internal film layer of the battery. Compared with the uncontrollable lamination pressure in the related art, the technical solution provided by the present disclosure is controllable.

[0010] In any embodiment, the battery assembly further comprises a sealing gasket covering at least part of the second sealing layer. The sealing gasket plays a waterproof role, so that the water vapor entering the inside of the battery assembly from the through hole through the first sealing layer and the second sealing layer can be reduced, and the sealing performance of the battery assembly is further improved.

[0011] In any embodiment, the part of the second sub-portion away from the first sub-portion extends to the edge of the side surface of the sealing gasket away from the second sealing layer on the side wall of the sealing gasket; the bus bar further comprises a third sub-portion, and the first sub-portion, the second sub-portion and the third sub-portion are sequentially connected, and at least part of the third sub-portion is laid on the side surface of the sealing gasket away from the second sealing layer. The extension directions of the second sub-portion and at least part of the third sub-portion laid on the side surface of the sealing gasket away from the second sealing layer are different, further increasing the length and difficulty of the channel through which the water vapor enters the inside of the battery assembly along the bus bar.

[0012] In any embodiment, the part of the second sub-portion away from the first sub-portion extends to the edge of the side surface of the sealing gasket away from the second sealing layer on the side wall of the sealing gasket; the bus bar further comprises a third sub-portion, and the first sub-portion, the second sub-portion and the third sub-portion are sequentially connected, and at least part of the third sub-portion is laid on the side surface of the sealing gasket away from the second sealing layer. The extension directions of the second sub-portion and at least part of the third sub-portion laid on the side surface of the sealing gasket away from the second sealing layer are different, further increasing the length and difficulty of the channel through which the water vapor enters the inside of the battery assembly along the bus bar.

[0013] In any embodiment, the battery assembly further comprises a junction box arranged on the second substrate, the first sealing layer, the second sealing layer and the sealing gasket are contained in the junction box, and one end of the third sub-portion away from the second sub-portion is connected with a junction end located in the junction box. In this way, the current generated by the battery is led out to the junction box.

[0014] In any of the embodiments, the battery assembly further comprises a filling layer, the filling layer fills the remaining space in the junction box and covers the first sealing layer, the second sealing layer, the sealing gasket and the exposed surface of the busbar, so as to further improve the sealing and waterproof performance of the battery assembly.

[0015] In any of the embodiments, the distance between the edge of the first sealing layer and the edge of the through hole is greater than 10 mm, so as to improve the sealing effect of the first sealing layer on the through hole.

[0016] In any of the embodiments, the battery assembly satisfies one or more of the following conditions:

[0017] (1) The material of the first sealing layer comprises one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer and polyvinyl butyral ester;

[0018] (2) The thickness of the first sealing layer is 0.1-3 mm;

[0019] (3) The material of the second sealing layer comprises one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer and polyvinyl butyral ester;

[0020] (4) The thickness of the first sealing layer is 0.1-3 mm;

[0021] (5) The material of the sealing gasket comprises at least one of semi-tempered ultra-white float glass, fully-tempered ultra-white float glass, non-tempered ultra-white float glass, high borosilicate glass, embossed glass, ceramic and photovoltaic backsheet, or a combination thereof;

[0022] (6) The thickness of the sealing gasket is 0.1-5 mm.

[0023] The materials of the first sealing layer, the second sealing layer and the sealing gasket have a waterproof effect and a specific thickness, which can reduce the penetration of water vapor from the through hole into the interior of the battery assembly through the first sealing layer and the second sealing layer, and further improve the sealing performance of the battery assembly.

[0024] In any of the embodiments, the battery comprises a perovskite solar cell. The perovskite absorption layer inside the perovskite solar cell is sensitive to water vapor. The technical solution provided by the present disclosure can reduce the influence of water vapor on the solar cell, especially the perovskite solar cell.

[0025] The second aspect of the present disclosure further provides a manufacturing method of a battery assembly, comprising:

[0026] providing a first substrate and forming a battery on the first substrate;

[0027] providing a bus bar, and electrically connecting one end of the bus bar to the battery;

[0028] providing a second substrate, and disposing the second substrate on the battery, the second substrate having at least one through hole penetrating the second substrate, and leading the other end of the bus bar out of the through hole;

[0029] forming a first sealing layer, the first sealing layer being disposed above the second substrate and the through hole, and the first sealing layer surrounding a portion of the bus bar; wherein the portion of the bus bar above the first sealing layer at least includes a first sub-portion and a second sub-portion connected in sequence;

[0030] firstly bending the bus bar, so that the first sub-portion is laid on a side surface of the first sealing layer away from the second substrate;

[0031] forming a second sealing layer, the second sealing layer covering the first sub-portion and at least a portion of the first sealing layer, and at least a portion of the second sub-portion being laid on a side wall of the second sealing layer or surrounded by the second sealing layer.

[0032] The manufacturing method of the battery assembly provided by the present disclosure forms a first sealing layer and a second sealing layer on the second substrate, and firstly bends and secondly bends the bus bar above the first sealing layer, so that the first sub-portion is sandwiched between the first sealing layer and the second sealing layer, and at least a portion of the second sub-portion is laid on a side wall of the second sealing layer or surrounded by the second sealing layer. The first sealing layer and the second sealing layer have a good sealing effect on the through hole, and the extension direction of the first sub-portion is different from the extension direction of the second sub-portion and the portion of the bus bar in the through hole. The method changes the channel of water vapor entering the inside of the battery assembly along the bus bar, increases the length of the channel of water vapor entering the inside of the battery assembly, and thus reduces the entry of water vapor, so that the entry rate of water vapor at the position of the through hole meets the use requirements.

[0033] In any embodiment, after the second sealing layer is formed on the first sealing layer, the method further includes: providing a sealing gasket, and disposing the sealing gasket on the second sealing layer. The sealing gasket has a waterproof effect, and the presence of the sealing gasket can reduce the entry of water vapor from the through hole into the inside of the battery assembly through the first sealing layer and the second sealing layer, and further increase the sealing performance of the battery assembly.

[0034] In any embodiment, after the sealing gasket is disposed on the second sealing layer, the method further includes: performing a lamination process on the battery assembly. In this way, the sealing gasket, the second sealing layer, the first sealing layer, and the two adjacent layers of the second substrate are combined more tightly, thereby increasing the waterproof performance at the position of the through hole of the second substrate.

[0035] In any of the embodiments, the busbar further comprises a third sub-portion, and the first sub-portion, the second sub-portion and the third sub-portion are sequentially connected;

[0036] The first sub-portion extends to the edge of the second sealing layer; and the at least part of the second sub-portion is laid on the side wall of the second sealing layer by: after the gasket is arranged on the second sealing layer, the busbar is secondly bent so that the second sub-portion extends to the edge of the side surface of the gasket away from the second sealing layer on the side wall of the second sealing layer and the gasket, and at least part of the third sub-portion is laid on the side surface of the gasket away from the second sealing layer.

[0037] The at least part of the second sub-portion is surrounded by the second sealing layer; and after the gasket is arranged on the second sealing layer, the method further comprises: the busbar is secondly bent so that the part of the second sub-portion away from the first sub-portion extends to the edge of the side surface of the gasket away from the second sealing layer on the side wall of the gasket, and at least part of the third sub-portion is laid on the side surface of the gasket away from the second sealing layer.

[0038] The extension directions of the second sub-portion and the at least part of the third sub-portion laid on the side surface of the gasket away from the second sealing layer are different, which further increases the length and difficulty of the channel for water vapor to enter the inside of the battery assembly along the busbar.

[0039] In any of the embodiments, after the busbar is secondly bent, the method further comprises: providing a terminal box, and arranging the terminal box on the second substrate, the first sealing layer, the second sealing layer and the gasket are contained in the terminal box; and connecting the end of the third sub-portion away from the second sub-portion with the terminal in the terminal box. In this way, the current generated by the battery is led out to the terminal box.

[0040] In any of the embodiments, after the end of the third sub-portion away from the second sub-portion is connected with the terminal in the terminal box, the method further comprises: injecting a filling layer in the terminal box, the filling layer fills the remaining space in the terminal box, and covers the first sealing layer, the second sealing layer, the gasket and the exposed surface of the busbar. In this way, the sealing and waterproof performance of the battery assembly is further improved.

[0041] The third aspect of the present disclosure further provides a power consuming device comprising the battery assembly of the first aspect of the present disclosure.

[0042] The fourth aspect of the present disclosure further provides a power generating device comprising the battery assembly of the first aspect of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0043] FIG. 1a is a schematic block diagram of a power consuming device according to some embodiments of the present disclosure; and FIG. 1b is a schematic block diagram of a power generating device according to some embodiments of the present disclosure;

[0044] Fig. 2a is a structural schematic diagram of a battery assembly according to some embodiments of the present disclosure, Fig. 2b is a structural schematic diagram of a sub-cell in Fig. 2a, and Fig. 2c is a top view of Fig. 2a;

[0045] Fig. 3 is a structural schematic diagram of a battery assembly according to some other embodiments of the present disclosure;

[0046] Fig. 4 is a flow chart of a manufacturing method of a battery assembly according to some embodiments of the present disclosure;

[0047] Figs. 5a to 11 are structural schematic diagrams of a battery assembly in a manufacturing process according to some embodiments of the present disclosure;

[0048] Figs. 12 to 13 are structural schematic diagrams of a battery assembly in a manufacturing process according to some other embodiments of the present disclosure.

[0049] Legend: 1: power consuming device; 2: power generating device; 100: battery assembly; 10: first substrate; 11: battery; 11': sub-cell; 111: first electrode layer; 112: first transport layer; 113: light absorbing layer; 114: second transport layer; 115: second electrode layer; 12: busbar; 121: first sub-portion; 122: second sub-portion; 123: third sub-portion; 13: first adhesive film; 14: second adhesive film; 15: second substrate; 151: through hole; 16: first sealing layer; 17: second sealing layer; 18: sealing gasket; 19: junction box; 191: terminal; 20: filling layer. DETAILED DESCRIPTION

[0050] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "include" and "have" and any variations thereof in the specification and claims of the present disclosure and the above description of drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like 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 technical features indicated. In the description of the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0053] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0054] In the description of the embodiments of the disclosure, the term“and / or” is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0055] In the description of the embodiments of the disclosure, the technical terms“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, operate or be used in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0056] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0057] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical term“contact” should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0058] The disclosure will be described in detail below.

[0059] The structure of a photovoltaic module generally comprises, from bottom to top, a front plate glass, a solar cell, a back plate glass, and a busbar connected to the solar cell, the back plate glass is provided with a through hole, and the busbar is led out from the through hole, so as to lead out the current generated by the solar cell. In actual application, water vapor is easy to enter the inside of the photovoltaic module through the through hole on the back plate glass, causing water vapor erosion to the solar cell, thereby affecting the output power of the photovoltaic module, and even bringing safety hazards, especially for the solar cell with a perovskite absorption layer. Therefore, it is necessary to manufacture a waterproof structure on the photovoltaic module to reduce the entry of water vapor.

[0060] In the related art, a butyl rubber gasket piece covering the openings of both ends of the through hole is generally formed on both sides of the back plate glass, and the butyl rubber gasket piece is filled in the inside of the through hole as a waterproof structure, and the busbar passes through the butyl rubber gasket pieces on both sides of the back plate glass and in the inside of the through hole to be led out.

[0061] The inventors of the present disclosure have noticed that the waterproof structure in the related art at least has the following problems: firstly, the pressure of the butyl rubber gasket piece in the inside of the through hole on the internal film layer of the solar cell affects the stability of the film layer; secondly, the butyl rubber gasket piece filled in the through hole is a key part of the waterproof structure, and the waterproof performance thereof mainly depends on the thickness of the back plate glass and the bonding degree of the butyl rubber gasket piece and the inner wall of the through hole. According to the requirement of 25 years of outdoor use of the photovoltaic module, it is generally required that the thickness of the back plate glass reaches 10 mm, and the thickness of the butyl rubber gasket piece in the inside of the through hole should also reach 10 mm, which does not conform to the trend of reducing the weight and cost of the photovoltaic module; the bonding degree of the butyl rubber gasket piece and the inner wall of the through hole depends on the downward lamination pressure of the butyl rubber gasket piece, which causes the butyl rubber gasket piece to completely fill the through hole and extrude the inner wall of the through hole in the horizontal direction, so as to form a good contact between the butyl rubber gasket piece and the inner wall of the through hole, that is, the extrusion force between the butyl rubber gasket piece in the through hole and the inner wall of the through hole is indirectly from the lamination pressure, which is uncontrollable and cannot guarantee a good contact between the butyl rubber gasket piece and the inner wall of the through hole. Therefore, it is urgent to provide a waterproof structure with good sealing performance.

[0062] Based on the above problems found by the inventors, the inventors propose a technical solution in which the first sub-part of the bus bar is clamped between the first sealing layer and the second sealing layer, and at least part of the second sub-part is laid on the side wall of the second sealing layer or surrounded by the second sealing layer. The first sealing layer and the second sealing layer play a good sealing role on the through hole, and the first sub-part is laid on the surface of the first sealing layer. The extension direction of the first sub-part is different from the extension direction of the second sub-part and the part of the bus bar located in the through hole. By changing the channel of water vapor entering the battery assembly along the bus bar, the length of the channel of water vapor entering the battery assembly is increased, thereby reducing the entry of water vapor, so that the water vapor entry rate at the position of the through hole meets the use requirements. Further, the present disclosure can also not need to set a butyl rubber gasket in the through hole and on the lower surface of the second substrate (i.e., the side of the second substrate close to the battery), which helps to reduce the lamination pressure on the internal film layer of the battery when performing the lamination process on the battery assembly, thereby reducing the damage to the internal film layer of the battery. Compared with the uncontrollable lamination pressure in the related art, the technical solution provided by the present disclosure is controllable.

[0063] The technical solution described in the embodiments of the present disclosure is applicable to a battery assembly, a power consumption device using the battery assembly, and a power generation device using the battery assembly. FIG. 1a is a schematic block diagram of a power consumption device 1 provided by some embodiments of the present disclosure, which includes a battery assembly 100. The power consumption device 1 can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as 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 a railway electric tool, such as 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 disclosure do not specially limit the above power consumption device 1.

[0064] FIG. 1b is a schematic block diagram of a power generation device 2 provided by some embodiments of the present disclosure, which includes the battery assembly 100. The power generation device 2 can also have a control system and a transmission system. The power generation device 2 provided by the present disclosure adjusts the electric energy generated from the battery assembly 100 to be able to match the electric energy of the power consumption device through the control system and the transmission system.

[0065] FIG. 2a is a structural schematic diagram of a battery assembly provided by some embodiments of the present disclosure, FIG. 2b is a structural schematic diagram of a sub-battery in FIG. 2a, FIG. 2c is a top view schematic diagram of FIG. 2a, and FIG. 3 is a structural schematic diagram of a battery assembly provided by another embodiment of the present disclosure.

[0066] As shown in FIGS. 2a-2c and FIG. 3, the battery assembly 100 provided by the embodiments of the present disclosure includes a first substrate 10, a second substrate 15 located on the first substrate 10, and a battery 11 encapsulated between the first substrate 10 and the second substrate 15. The second substrate 15 has at least one through hole 151 extending through the second substrate 15. At least one bus bar 12 is electrically connected to the battery 11 at one end and extends out of the through hole 151 at the other end. A first sealing layer 16 is located above the second substrate 15 and the through hole 151, and the first sealing layer 16 is arranged around part of the bus bar 12. A second sealing layer 17 is located on a side of the first sealing layer 16 away from the second substrate 15. The part of the bus bar 12 above the first sealing layer 16 includes at least a first sub-portion 121 and a second sub-portion 122 connected in sequence. The first sub-portion 121 is sandwiched between the first sealing layer 16 and the second sealing layer 17, and at least part of the second sub-portion 122 is laid on the sidewall of the second sealing layer 17 or surrounded by the second sealing layer 17.

[0067] The materials of the first substrate 10 and the second substrate 15 are the same or different. In some embodiments, the second substrate 15 and the first substrate 10 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, cellulose tetraacetate, brominated phenoxy, aromatic polyamide, polyimide, polystyrene, polyarylate, polysulfone, polyolefin, etc. In a specific embodiment, the first substrate 10 and the second substrate 15 are both glass substrates.

[0068] In some embodiments, the battery 11 includes a solar cell, and the number of the solar cell can be one or multiple. When the number of the solar cell is multiple, the multiple solar cells can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple solar cells are connected in series and in parallel at the same time, which can provide higher voltage and capacity.

[0069] As shown in FIG. 2b, in some embodiments, the solar cell includes one or more sub-cells 11'. When the number of the sub-cells 11' is multiple, the multiple sub-cells 11' can be connected in series, in parallel, or in a mixed connection. In some embodiments, the sub-cell 11' includes a first electrode layer 111, a first transport layer 112, a light-absorbing layer 113, a second transport layer 114, and a second electrode layer 115 stacked in order from bottom to top on the first substrate 10.

[0070] In some embodiments, the light-absorbing layer 113 is a perovskite absorption layer; the first electrode layer 111 is a transparent electrode for light incidence, the first transport layer 112 is an electron transport layer, and the second transport layer 114 is a hole transport layer, in which case the battery is a normal perovskite battery. However, in other embodiments, the light-absorbing layer 113 is a perovskite absorption layer; the first electrode layer 111 is a transparent electrode for light incidence, the first transport layer 112 is a hole transport layer, and the second transport layer 114 is an electron transport layer, in which case the battery is an inverted perovskite battery. In some embodiments, the number of bus bars 12 is two, and the two bus bars 12 are respectively connected to the positive and negative electrodes of the battery 11, such as the first electrode layer 111 and the second electrode layer 115, to lead out the current generated by the battery 11.

[0071] In some embodiments, the edge of the battery 11 has a predetermined distance from the edge of the first substrate 10 to expose the edge of the first substrate 10; the battery assembly 100 further comprises a first adhesive film 13 disposed along the edge of the first substrate 10, and the second substrate 15 and the first substrate 10 are sealed and connected by the first adhesive film 13. The material of the first adhesive film 13 includes but is not limited to butyl rubber.

[0072] In some embodiments, the battery assembly 100 further comprises a second adhesive film 14 disposed between the first substrate 10 and the second substrate 15 in the area surrounded by the first adhesive film 13 (the second adhesive film 14 can also cover the area where the first adhesive film 13 is disposed), and covering the battery 11, for sealing the battery 11.

[0073] In some embodiments, the battery assembly further comprises an insulating layer (not shown) disposed between part of the bus bars 12 and the second electrode layer 115 of the plurality of sub-batteries 11' (except for the sub-batteries 11' from which the bus bars 12 lead out the positive and negative electrodes), to prevent short circuiting between the sub-batteries 11', and the second adhesive film 14 is laid under the insulating layer (not shown) or part of the bus bars 12, and the bus bars 12 are led out from the through holes 151 of the second substrate 15.

[0074] In some embodiments, the material of the second adhesive film 14 is a hot melt adhesive film, such as made of PVB (polyvinyl butyral), EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), POM (polyoxymethylene resin), PVD (polyvinylidene chloride), TPO (thermoplastic polyolefin), or TPU (thermoplastic polyurethane elastomer).

[0075] As shown in FIG. 2a and FIG. 3, in some embodiments, the number of the through hole 151 is two, and the two bus bars 12 are respectively led out from the two through holes 151. However, the number of the through hole 151 can also be one in other embodiments of the present disclosure, and the two bus bars 12 are led out from the through hole 151. As shown in FIG. 2c, in an embodiment, the cross-sectional shape of the through hole 151 is circular.

[0076] As shown in FIG. 2a, in some embodiments, the first sub-part 121 of the bus bar 12 extends to the edge of the second sealing layer 17, and at least part of the second sub-part 122 is laid on the side wall of the second sealing layer 17. However, as shown in FIG. 3, in other embodiments of the present disclosure, the first sub-part 121 does not extend to the edge of the second sealing layer 17, and the second sealing layer 17 is arranged around part of the second sub-part 122; optionally, the second sub-part 122 is arranged through the second sealing layer 17.

[0077] In the present disclosure, the part of the bus bar 12 above the first sealing layer 16 at least includes the sequentially connected first sub-part 121 and second sub-part 122, wherein the first sub-part 121 is clamped between the first sealing layer 16 and the second sealing layer 17, at least part of the second sub-part 122 is laid on the side wall of the second sealing layer 17 or surrounded by the second sealing layer 17, the first sealing layer 16 and the second sealing layer 17 have a good sealing effect on the through hole 151, and the extension direction of the first sub-part 121 is different from the extension direction of the part of the bus bar 12 in the through hole 151 and the second sub-part 122, which changes the channel of the water vapor entering the inside of the battery assembly 100 along the bus bar 12, increases the length of the channel of the water vapor entering the inside of the battery assembly 100, and thus reduces the water vapor entering, so that the water vapor entering rate at the position of the through hole 151 meets the use requirement. Here, the inside of the battery assembly 100 refers to between the first substrate 10 and the second substrate 15.

[0078] In addition, the present disclosure does not need to arrange a butyl rubber gasket in the through hole 151 and the lower surface of the second substrate 15 (i.e., the side of the second substrate 15 close to the battery 11), which helps to reduce the lamination pressure on the internal film layer (especially the light-absorbing layer 113, such as the perovskite absorption layer) of the battery 11 when performing the lamination process on the battery assembly 100, thereby reducing the damage to the internal film layer of the battery 11. Compared with the uncontrollable lamination pressure in the related art, the technical solution provided by the present disclosure is controllable.

[0079] In some embodiments, the material of the bus bar 12 includes one or more of copper, aluminum, silver, gold, tinned copper, or an alloy thereof. In some embodiments, the thickness of the bus bar 12 ranges between 0.05 mm and 0.3 mm (including the end point value), such as 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0080] In some embodiments, the distance W between the edge of the first sealing layer 16 and the edge of the through hole 151 is greater than 10 mm, such as 12 mm, 15 mm, 17 mm, 20 mm, 25 mm, 30 mm, etc. By setting the distance W between the edge of the first sealing layer 16 and the edge of the through hole 151 to be greater than 10 mm, the sealing effect of the first sealing layer 16 on the through hole 151 is improved.

[0081] As shown in FIG. 2a and FIG. 3, the first sub-part 121 extends in a straight line on the first sealing layer 16, and the extending directions of the first sub-parts 121 of the two bus bars 12 are opposite. However, the extending directions of the first sub-parts 121 are not limited to being opposite, and can be any direction parallel to the plane of the first substrate 10. In addition, the first sub-part 121 can also extend in a broken line or a curve on the first sealing layer 16 to further increase the length and difficulty of the path of water vapor entering the inside of the battery assembly 100 along the bus bars 12, thereby further improving the waterproof effect.

[0082] In some embodiments, the material of the first sealing layer 16 includes one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer, and polyvinyl butyral. In some embodiments, the thickness of the first sealing layer 16 ranges between 0.1 mm and 3 mm (including the end values), such as 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. In the present disclosure, the material of the first sealing layer 16 is a high water-resistant glue, and the thickness of the first sealing layer 16 is between 0.1 mm and 3 mm, thereby reducing the water vapor from the through hole 151 into the inside of the battery assembly 100 through the first sealing layer 16.

[0083] In some embodiments, the material of the second sealing layer 17 includes one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer, and polyvinyl butyral, and the material of the second sealing layer 17 and the material of the first sealing layer 16 can be the same or different. The thickness of the second sealing layer 17 ranges between 0.1 mm and 3 mm (including the end values), such as 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. In the present disclosure, the material of the second sealing layer 17 is a high water-resistant glue, and the thickness of the second sealing layer 17 is between 0.1 mm and 3 mm, thereby reducing the water vapor from the through hole 151 into the inside of the battery assembly 100 through the second sealing layer 17.

[0084] In some embodiments, the battery assembly further comprises a sealing gasket 18 covering at least part of the second sealing layer 17. In some embodiments, the material of the sealing gasket 18 comprises at least one of waterproof materials such as glass, ceramic, photovoltaic backsheet, or a combination thereof. The sealing gasket 18 is arranged above the first sealing layer 16 and the second sealing layer 17, and functions as a waterproof layer to reduce the penetration of water vapor from the through hole 151 into the interior of the battery assembly 100 through the first sealing layer 16 and the second sealing layer 17, and further increases the sealing performance of the battery assembly 100. In some embodiments, the thickness of the sealing gasket 18 ranges from 0.1 mm to 5 mm (including the end values), such as 0.1 mm, 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0085] Optionally, the glass comprises at least one of semi-tempered ultra-white float glass, fully-tempered ultra-white float glass, non-tempered ultra-white float glass, high borosilicate glass, embossed glass, or a combination thereof.

[0086] In some embodiments, the sealing gasket 18 comprises an insulating photovoltaic backsheet having low water permeability, insulating properties, and a flexible structure, which can reduce the deformation stress between the junction box and the second substrate 15 due to wind load, snow load, etc. as the sealing gasket 18, and improve the mechanical strength of the battery assembly in strong winds or snowy weather. The photovoltaic backsheet comprises an insulating buffer layer and a metal foil arranged in layers, the metal foil comprises aluminum foil, copper, silver, etc., and the metal foil has good water-blocking effect. The insulating buffer layer is used to prevent short circuit caused by contact between the metal foil and the busbar structure, and has waterproof and insulating effects. Optionally, the metal foil is surrounded by the insulating buffer layer or the insulating layer to prevent contact with the second sub-portion 122 and / or the first sub-portion 121. In some embodiments, the photovoltaic backsheet can further comprise an insulating buffer layer, an adhesive, a metal foil, and an outer coating arranged in layers, and the outer coating is generally an insulating coating. The insulating buffer layer or the outer coating can surround the metal foil except for the upper and lower surfaces to reduce contact with the busbar structure, such as the BPF-805 type photovoltaic backsheet of Changzhou Baijia Technology Co., Ltd.

[0087] In some embodiments, the material of the insulating buffer layer can be at least one of polyethylene terephthalate (PET) and polyimide (PI).

[0088] As shown in FIG. 2a, in some embodiments, the first sealing layer 16, the second sealing layer 17 and the sealing gasket 18 overlap in the orthographic projection on the first substrate 10 plane. As shown in FIG. 3, in other embodiments, the first sealing layer 16 and the second sealing layer 17 overlap in the orthographic projection on the first substrate 10 plane, the sealing gasket 18 covers part of the second sealing layer 17, and the orthographic projection of the sealing gasket 18 on the first substrate 10 plane falls within the orthographic projection of the first sealing layer 16 and the second sealing layer 17 on the first substrate 10 plane. However, the size of the first sealing layer 16 can also be greater than the size of the second sealing layer 17 and the sealing gasket 18, and the orthographic projection of the second sealing layer 17 and the sealing gasket 18 on the first substrate 10 plane falls within the orthographic projection of the first sealing layer 16 on the first substrate 10 plane.

[0089] In actual applications, after sequentially forming the first sealing layer 16, the second sealing layer 17 and the sealing gasket 18 on the second substrate 15, a laminating machine can be used to perform a laminating process on the battery assembly 100 to make the sealing gasket 18, the second sealing layer 17, the first sealing layer 16 and the two adjacent structures of the second substrate 15 more closely combined, thereby increasing the waterproof performance at the position of the through hole 151 of the second substrate 15; at the same time, the combination between the first substrate 10 and the second substrate 15 through the first adhesive film 13 and the second adhesive film 14 is more closely combined, thereby improving the sealing performance of the battery 11.

[0090] In some embodiments, the part of the second sub-portion 122 away from the first sub-portion 121 extends to the edge of the side surface of the sealing gasket 18 away from the second sealing layer 17 on the side wall of the sealing gasket 18; the bus bar 12 further includes a third sub-portion 123, and the first sub-portion 121, the second sub-portion 122 and the third sub-portion 123 are sequentially connected, one end of the first sub-portion 121 is connected to the part of the bus bar 12 surrounded by the first sealing layer 16, the other end is connected to the second sub-portion 122, and at least part of the third sub-portion 123 is laid on the side surface of the sealing gasket 18 away from the second sealing layer 17.

[0091] In some embodiments, the sealing gasket 18 is arranged around the portion of the second sub-portion 122 away from the first sub-portion 121, and the portion of the second sub-portion 122 away from the first sub-portion 121 extends to the side surface of the sealing gasket 18 away from the second sealing layer 17. The busbar 12 further comprises a third sub-portion 123, and the first sub-portion 121, the second sub-portion 122 and the third sub-portion 123 are sequentially connected, one end of the first sub-portion 121 is connected to the portion of the busbar 12 surrounded by the first sealing layer 16, and the other end is connected to the second sub-portion 122, and at least a portion of the third sub-portion 123 is arranged on the side surface of the sealing gasket 18 away from the second sealing layer 17. Further, the portion of the second sub-portion 122 away from the first sub-portion 121 is arranged through the sealing gasket 18. Still further, in the case that the portion of the second sub-portion 122 away from the first sub-portion 121 is arranged through the sealing gasket 18 and the second sub-portion 122 is arranged through the second sealing layer 17, the projections of the holes for the second sub-portion 122 on the plane of the first substrate 10 can at least partially coincide with each other to facilitate the operation, but are not limited thereto, and the projections of the holes for the second sub-portion 122 on the plane of the first substrate 10 can also not coincide with each other.

[0092] In the present disclosure, the extension directions of the second sub-portion 122 and the at least a portion of the third sub-portion 123 arranged on the side surface of the sealing gasket 18 away from the second sealing layer 17 are different, further increasing the length and difficulty of the channel for the water vapor to enter the inside of the battery assembly 100 along the busbar 12.

[0093] In the present disclosure, the extension directions of the second sub-portion 122 and the at least a portion of the third sub-portion 123 arranged on the side surface of the sealing gasket 18 away from the second sealing layer 17 are different, further increasing the length and difficulty of the channel for the water vapor to enter the inside of the battery assembly 100 along the busbar 12.

[0094] In some embodiments, the battery assembly 100 further comprises a terminal box 19 arranged on the second substrate 15, and the first sealing layer 16, the second sealing layer 17 and the sealing gasket 18 are contained in the terminal box 19, and one end of the third sub-portion 123 away from the second sub-portion 122 is connected to a terminal 191 in the terminal box 19, so as to lead the current generated by the battery 11 out of the terminal box 19.

[0095] In some embodiments, the terminal 191 in the terminal box 19 includes a positive terminal (not labeled) and a negative terminal (not labeled), and the two bus bars 12 are welded to the positive terminal (not labeled) and the negative terminal (not labeled) of the terminal box 19, respectively.

[0096] In an embodiment, the battery assembly 100 further includes a filling layer 20, which fills the remaining space in the terminal box 19 and covers the first sealing layer 16, the second sealing layer 17, the sealing gasket 18, and the exposed surface of the bus bar 12, where the exposed surface of the bus bar 12 refers to the surface of the bus bar 12 in the terminal box 19 that is not in contact with the first sealing layer 16, the second sealing layer 17, the sealing gasket 18, and the terminal 191, thereby further improving the sealing and waterproof performance of the battery assembly 100. The material of the filling layer 20 can be AB silicone gel, where the mass ratio of component A to component B is 1:1.

[0097] In actual application, after filling the filling layer 20 in the terminal box 19, the top cover (not labeled) of the terminal box 19 can be buckled.

[0098] The present disclosure also provides a manufacturing method of a battery assembly, as shown in FIG. 4, the manufacturing method includes:

[0099] Step S101, providing a first substrate and forming a battery on the first substrate;

[0100] Step S102, providing a bus bar and electrically connecting one end of the bus bar to the battery;

[0101] Step S103, providing a second substrate and arranging the second substrate on the battery, the second substrate having at least one through hole penetrating the second substrate, and the other end of the bus bar is led out from the through hole;

[0102] Step S104, forming a first sealing layer above the second substrate and the through hole, and arranging the first sealing layer around part of the bus bar; wherein the part of the bus bar above the first sealing layer at least includes a first sub-portion and a second sub-portion connected in sequence;

[0103] Step S105, first bending the bus bar to lay the first sub-portion on the side surface of the first sealing layer away from the second substrate;

[0104] Step S106, forming a second sealing layer covering the first sub-portion and at least part of the first sealing layer, and laying at least part of the second sub-portion on the side wall of the second sealing layer or surrounding the second sub-portion by the second sealing layer.

[0105] The manufacturing method of the present disclosure will be further described in detail below in combination with the drawings.

[0106] Firstly, step S101 is performed, as shown in FIGS. 5a-5b, a first substrate 10 is provided, and a battery 11 is formed on the first substrate 10.

[0107] In some embodiments, the battery 11 comprises a solar cell, and the number of the solar cell can be one or multiple. When the number of the solar cell is multiple, the multiple solar cells can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple solar cells are connected in series and in parallel at the same time, which can provide higher voltage and capacity.

[0108] As shown in FIG. 5b, in some embodiments, the solar cell comprises one or more sub-cells 11'. When the number of the sub-cells 11' is multiple, the multiple sub-cells 11' can be connected in series, in parallel, or in a mixed manner. In some embodiments, the sub-cell 11' comprises, from bottom to top, a first electrode layer 111, a first transport layer 112, a light-absorbing layer 113, a second transport layer 114, and a second electrode layer 115 formed on the first substrate 10.

[0109] In some embodiments, the light-absorbing layer 113 is a perovskite absorption layer; the first electrode layer 111 is a transparent electrode for light incidence; the first transport layer 112 is an electron transport layer; and the second transport layer 114 is a hole transport layer, and the battery is a formal perovskite battery. However, the battery is not limited to this, and in another embodiment, the light-absorbing layer 113 is a perovskite absorption layer; the first electrode layer 111 is a transparent electrode for light incidence; the first transport layer 112 is a hole transport layer; and the second transport layer 114 is an electron transport layer, and the battery is a reverse perovskite battery. In some embodiments, the number of the bus bars 12 is two, and the two bus bars 12 are respectively connected with the positive electrode and the negative electrode of the battery 11, such as being respectively electrically connected with the first electrode layer 111 and the second electrode layer 115, to lead out the current generated by the battery 11.

[0110] In some embodiments, after the battery 11 is formed on the first substrate 10, the method further comprises: edge cleaning and testing of the battery 11. The edge cleaning means that the edge of the battery 11 is etched, so that the edge of the battery 11 has a preset distance from the edge of the first substrate 10, thereby exposing the edge of the first substrate 10.

[0111] Then, step S102 is performed, as shown in FIG. 6, a bus bar 12 is provided, and one end of the bus bar 12 is electrically connected with the battery 11.

[0112] In some embodiments, the number of the bus bars 12 is two, and the two bus bars 12 are respectively electrically connected with the first electrode layer 111 and the second electrode layer 115 of the battery 11, to lead out the current generated by the battery 11.

[0113] In some embodiments, the material of the bus bar 12 includes one or more of copper, aluminum, silver, gold, tinned copper, or alloys thereof, etc. In some embodiments, the thickness of the bus bar 12 ranges between 0.05mm to 0.3mm (including the end values), such as 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc.

[0114] Referring again to FIG. 6, in some embodiments, after electrically connecting one end of the bus bar 12 to the battery 11, the method further includes: forming a first adhesive film 13 and a second adhesive film 14 on the first substrate 10, the first adhesive film 13 being disposed along the edge of the first substrate 10; the second adhesive film 14 being located in the area of the first substrate 10 surrounded by the first adhesive film 13 (the second adhesive film 14 can also cover the area where the first adhesive film 13 is disposed), and covering the battery 11.

[0115] The material of the first adhesive film 13 includes but is not limited to butyl rubber, and the material of the second adhesive film 14 is a hot melt adhesive film, such as made of PVB (polyvinyl butyral), EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), POM (polyoxymethylene resin), PVD (polyvinylidene chloride), TPO (thermoplastic polyolefin), or TPU (thermoplastic polyurethane elastomer), etc. In actual application, the first film layer 13 and the second film layer 14 can be directly pasted on the first substrate 10.

[0116] In some embodiments, the method further includes: disposing an insulating layer (not shown) between the partial bus bar 12 and the second electrode layer 115 of the plurality of sub-batteries 11' (except for the sub-batteries 11' from which the positive and negative electrodes of the bus bar 12 are led out), and the second adhesive film 14 is laid under the insulating layer (not shown) or above the partial bus bar 12, and the insulating layer (not shown) is used to prevent short circuit between the sub-batteries 11'.

[0117] Next, step S103 is performed, as shown in FIG. 7, a second substrate 15 is provided, and the second substrate 15 is disposed on the battery 11, the second substrate 15 has at least one through hole 151 penetrating through the second substrate 15, and the other end of the bus bar 12 is led out from the through hole 151.

[0118] The second substrate 15 covers the first adhesive film 13 and the second adhesive film 14 to encapsulate the battery 11 between the first substrate 10 and the second substrate 15, and the first substrate 10 and the second substrate 15 are sealedly connected through the first adhesive film 13 and the second adhesive film 14. In actual application, when the second substrate 15 is covered on the surface of the battery 11, the second substrate 15 should be as much as possible to be attached with the first adhesive film 13 and the second adhesive film 14, which helps to reduce or avoid the risk of the second substrate 15 being broken when the subsequent lamination process is performed on the battery assembly.

[0119] The first substrate 10 and the second substrate 15 are made of the same or different materials. In some embodiments, the first substrate 10 and the second substrate 15 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, cellulose tetraacetate, brominated phenoxy, aromatic polyamide, polyimide, polystyrene, polyarylate, polysulfone, polyolefin, etc. In a specific embodiment, the first substrate 10 and the second substrate 15 are both glass substrates.

[0120] In some embodiments, the number of the through hole 151 is two, and the two bus bars 12 are respectively led out from the two through holes 151. However, the number of the through hole 151 can also be one in other embodiments of the present disclosure, and the two bus bars 12 are led out from the one through hole 151. In some embodiments, the cross section of the through hole 151 is circular.

[0121] Then, step S104 is performed, and the first sealing layer 16 is formed above the second substrate 15 and the through hole 151, as shown in FIG. 8. The first sealing layer 16 is arranged around part of the bus bar 12; wherein the part of the bus bar 12 above the first sealing layer 16 at least includes the first sub-part 121 and the second sub-part 122 connected in sequence.

[0122] The first sealing layer 16 is used to seal the opening of the through hole 151 in the second substrate 15. In some embodiments, the distance W between the edge of the first sealing layer 16 and the edge of the through hole 151 is greater than 10 mm, for example, 15 mm, 20 mm, 25 mm, 30 mm, etc. By setting the distance W between the edge of the first sealing layer 16 and the edge of the through hole 151 to be greater than 10 mm, the sealing effect of the first sealing layer 16 on the through hole 151 is improved.

[0123] In some embodiments, the material of the first sealing layer 16 includes one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer, and polyvinyl butyral. In some embodiments, the thickness of the first sealing layer 16 ranges between 0.1 mm and 3 mm (including the end values), for example, 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. In the present disclosure, the material of the first sealing layer 16 is high water-resistant glue, and the thickness of the first sealing layer 16 is between 0.1 mm and 3 mm, so as to reduce the penetration of water vapor from the through hole 151 into the inside of the battery assembly 100 through the first sealing layer 16.

[0124] In some embodiments, the busbar 12 further comprises a third sub-portion 123, the first sub-portion 121, the second sub-portion 122 and the third sub-portion 123 are sequentially connected, one end of the first sub-portion 121 is connected to the part of the busbar 12 surrounded by the first sealing layer 16, and the other end is connected to the second sub-portion 122.

[0125] Then, step S105 is performed, and the busbar 12 is first bent, as shown in FIG. 9, so that the first sub-portion 121 is laid on the side surface of the first sealing layer 16 away from the second substrate 15.

[0126] The first sub-portion 121 shown in FIG. 9 extends in a straight line on the first sealing layer 16, and the extension directions of the first sub-portion 121 of the two busbars 12 are opposite. However, the first sub-portion 121 can also extend in a broken line or a curve on the first sealing layer 16, and the extension directions of the first sub-portion 121 of the two busbars 12 are not limited to be opposite, but can also be any direction parallel to the plane of the first substrate 10.

[0127] The first sub-portion 121 shown in FIG. 9 extends to the edge of the first sealing layer 16. However, the first sub-portion 121 can also not extend to the edge of the first sealing layer 16.

[0128] Then, step S106 is performed, and the second sealing layer 17 is formed, as shown in FIGS. 10-11, the second sealing layer 17 covers the first sub-portion 121 and at least part of the first sealing layer 16, and at least part of the second sub-portion 122 is laid on the side wall of the second sealing layer 17.

[0129] In some embodiments, the material of the second sealing layer 17 comprises one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer, and polyvinyl butyral, and the material of the second sealing layer 17 can be the same as or different from the material of the first sealing layer 16. In some embodiments, the thickness of the second sealing layer 17 ranges between 0.1 mm and 3 mm (including the end values), for example, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 1 mm, 2 mm, 3 mm, etc. In the present disclosure, the material of the second sealing layer 17 is high water-resistant glue, and the thickness of the second sealing layer 17 is between 0.1 mm and 3 mm, so as to reduce the water vapor from the through hole 151 into the inside of the battery assembly 100 through the second sealing layer 17.

[0130] Referring again to FIG. 11, in some embodiments, after the second sealing layer 17 is formed on the first sealing layer 16, the method further comprises: providing a sealing gasket 18, and arranging the sealing gasket 18 on the second sealing layer 17.

[0131] In some embodiments, the material of the sealing gasket 18 includes one or any combination of waterproof materials such as semi-tempered ultra-white float glass, fully-tempered ultra-white float glass, non-tempered ultra-white float glass, high-borosilicate glass, embossed glass, ceramic, and photovoltaic backsheet, etc. The sealing gasket 18 is arranged above the first sealing layer 16 and the second sealing layer 17, and functions to prevent water from penetrating into the interior of the battery assembly 100 from the through hole 151 through the first sealing layer 16 and the second sealing layer 17, thereby further increasing the sealing performance of the battery assembly 100. In some embodiments, the thickness of the sealing gasket 18 ranges from 0.1 mm to 5 mm (including the end values), such as 0.1 mm, 0.3 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0132] As shown in FIG. 10, in some embodiments, the first sub-portion 121 extends to the edge of the second sealing layer 17. As shown in FIG. 11, at least part of the second sub-portion 122 is arranged on the side wall of the second sealing layer 17, including: after the sealing gasket 18 is arranged on the second sealing layer 17, the busbar 12 is bent again, so that the second sub-portion 122 extends to the edge of the side surface of the sealing gasket 18 away from the second sealing layer 17 on the side wall of the second sealing layer 17 and the sealing gasket 18, and at least part of the third sub-portion 123 is arranged on the side surface of the sealing gasket 18 away from the second sealing layer 17.

[0133] Specifically, the busbar 12 is bent at the edge of the interface between the first sealing layer 16 and the second sealing layer 17, so that the second sub-portion 122 extends on the side wall of the second sealing layer 17 and the sealing gasket 18, and the busbar 12 is bent at the edge of the side surface of the sealing gasket 18 away from the second sealing layer 17, so that at least part of the third sub-portion 123 is arranged on the side surface of the sealing gasket 18 away from the second sealing layer 17.

[0134] The first sub-portion 121 of the busbar 12 shown in FIGS. 10-11 extends to the edge of the second sealing layer 12. However, it is not limited thereto. As shown in FIG. 12, in another embodiment of the present disclosure, the second sealing layer 12 can also be arranged around part of the second sub-portion 122. As shown in FIG. 13, after the sealing gasket 18 is arranged on the second sealing layer 17, the method further includes: the busbar 12 is bent again, so that the part of the second sub-portion 122 away from the first sub-portion 121 extends to the edge of the side surface of the sealing gasket 18 away from the second sealing layer 17 on the side wall of the sealing gasket 18, and at least part of the third sub-portion 123 is arranged on the side surface of the sealing gasket 18 away from the second sealing layer 17.

[0135] As shown in FIG. 11, in some embodiments, the first sealing layer 16, the second sealing layer 17 and the sealing gasket 18 overlap in the orthographic projection on the first substrate 10 plane, and the first sub-portion 121 extends to the edges of the first sealing layer 16 and the second sealing layer 17. As shown in FIG. 13, in other embodiments, the first sealing layer 16 and the second sealing layer 17 overlap in the orthographic projection on the first substrate 10 plane, and the sealing gasket 18 covers part of the second sealing layer 17, and the orthographic projection of the sealing gasket 18 on the first substrate 10 plane falls within the orthographic projection of the first sealing layer 16 and the second sealing layer 17 on the first substrate 10 plane. However, the size of the first sealing layer 16 can also be greater than the size of the second sealing layer 17 and the sealing gasket 18, and the orthographic projection of the second sealing layer 17 and the sealing gasket 18 on the first substrate 10 plane falls within the orthographic projection of the first sealing layer 16 on the first substrate 10 plane.

[0136] In some embodiments, after the sealing gasket 18 is arranged on the second sealing layer 17, the method further comprises: performing a lamination process on the battery assembly. Specifically, the battery assembly is placed in a laminator, and the parameters are set, and the lamination operation is completed, so that the sealing gasket 18, the second sealing layer 17, the first sealing layer 16 and the adjacent two layers of structures in the second substrate 15 are combined more tightly, thereby increasing the waterproof performance at the position of the through hole 151 of the second substrate 15; at the same time, the combination between the first substrate 10 and the second substrate 15 through the first adhesive film 13 and the second adhesive film 14 is more tightly, thereby improving the sealing performance of the battery 11 package.

[0137] In the present disclosure, the lamination process can be performed on the battery assembly before or after the second bending of the bus bar 12.

[0138] The manufacturing method of the battery assembly provided by the present disclosure forms the first sealing layer 16 and the second sealing layer 17 on the second substrate 15, and performs the first bending and the second bending on the bus bar 12 located above the first sealing layer 16, so that the first sub-portion 121 is clamped between the first sealing layer 16 and the second sealing layer 17, and at least part of the second sub-portion 122 is laid on the side wall of the second sealing layer 17 or surrounded by the second sealing layer 17. The first sealing layer 16 and the second sealing layer 17 play a good sealing role on the through hole 151, and the extension direction of the first sub-portion 121 is different from the extension direction of the second sub-portion 122 and the part of the bus bar 12 located in the through hole 151. At the same time, the length of the channel through which the water vapor enters the inside of the battery assembly 100 is increased, thereby reducing the water vapor entering, so that the water vapor entering rate at the position of the through hole 151 meets the use requirement. Here, the inside of the battery assembly 100 refers to the space between the first substrate 10 and the second substrate 15.

[0139] In addition, the present disclosure does not need to arrange a butyl rubber gasket in the through hole 151 and the lower surface of the second substrate 15 (i.e., the side of the second substrate 15 close to the battery 11), which helps to reduce the lamination pressure on the internal film layers of the battery 11 (especially the light-absorbing layer 113, such as the perovskite absorption layer) when performing the lamination process on the battery assembly 100, thereby reducing the damage to the internal film layers of the battery 11. Compared with the uncontrollable lamination pressure in the related art, the technical solution provided by the present disclosure is controllable.

[0140] In the present disclosure, the first sub-part 121 can also extend along a fold line or a curve on the first sealing layer 16, which can further increase the length and difficulty of the channel of water vapor entering the inside of the battery assembly 100 along the bus bar 12, thereby further improving the waterproof effect.

[0141] The third sub-part 123 of the two bus bars 12 shown in FIGS. 11 and 13 extends along a straight line away from the part of the sealing gasket 18 on the side surface away from the second sealing layer 17, and the extension directions are opposite, but are not limited to this. The third sub-part 123 can also extend along a fold line or a curve on the side surface of the sealing gasket 18 away from the second sealing layer 17, so as to further increase the length and difficulty of the channel of water vapor entering the inside of the battery assembly 100 along the bus bar 12, and the extension directions of the two bus bars 12 arranged on the part of the sealing gasket 18 on the side surface away from the second sealing layer 17 are not limited to being opposite, but can also be any direction parallel to the plane of the first substrate 10.

[0142] Next, as shown in FIG. 2a, on the basis of FIG. 11, after the second bending of the bus bar 12, the method further includes: providing a junction box 19, and arranging the junction box 19 on the second substrate 15, the first sealing layer 16, the second sealing layer 17, and the sealing gasket 18 being contained in the junction box 19; connecting the end of the third sub-part 123 away from the second sub-part 122 with a junction end 191 in the junction box 19, so as to lead the current generated by the battery 11 out of the junction box 19.

[0143] In some embodiments, the junction end 191 in the junction box 19 includes a positive electrode (not identified) and a negative electrode (not identified), and the two bus bars 12 are connected with the positive electrode (not identified) and the negative electrode (not identified) of the junction box 19 by welding.

[0144] With reference to FIG. 2a, after connecting the end of the third sub-portion 123 away from the second sub-portion 122 to the terminal 191 in the terminal box 19, the method further comprises injecting a filling layer 20 in the terminal box 19, the filling layer 20 filling the remaining space in the terminal box 19 and covering the first sealing layer 16, the second sealing layer 17, the sealing gasket 18 and the exposed surface of the busbar 12, where the exposed surface of the busbar 12 refers to the surface of the busbar 12 in the terminal box 19 that is not in contact with the first sealing layer 16, the second sealing layer 17, the sealing gasket 18 and the terminal 191, thereby further improving the sealing and waterproof performance of the battery assembly. Here, the filling layer 20 can be AB silicone gel, where the mass ratio of the A component to the B component is 1:1.

[0145] In actual applications, after filling the filling layer 20 in the terminal box 19, the top cover (not labeled) of the terminal box 19 can be buckled.

[0146] In some other embodiments of the present disclosure, the same steps as in FIG. 2a are performed on the basis of FIG. 13, and finally a structure as shown in FIG. 3 is formed, which will not be described here.

[0147] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; 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 disclosure, and they should be covered in the scope of the claims and the specification of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery assembly, comprising: a first substrate, a second substrate on the first substrate, and a battery encapsulated between the first substrate and the second substrate; wherein the second substrate has at least one through hole penetrating the second substrate; at least one busbar, one end of the busbar being electrically connected to the battery, and the other end leading out from the through hole; a first sealing layer above the second substrate and the through hole, the first sealing layer being arranged around part of the busbar; a second sealing layer on a side of the first sealing layer away from the second substrate; wherein part of the busbar above the first sealing layer at least comprises a first sub-portion and a second sub-portion connected in sequence, the first sub-portion being sandwiched between the first sealing layer and the second sealing layer, and at least part of the second sub-portion being laid on a sidewall of the second sealing layer or being surrounded by the second sealing layer.

2. The battery assembly of claim 1, wherein, The battery assembly further comprises a sealing gasket covering at least part of the second sealing layer.

3. The battery assembly of claim 2, wherein, Part of the second sub-portion away from the first sub-portion extends to an edge of a side surface of the sealing gasket away from the second sealing layer; the busbar further comprises a third sub-portion, the first sub-portion, the second sub-portion and the third sub-portion being connected in sequence, and at least part of the third sub-portion being laid on the side surface of the sealing gasket away from the second sealing layer.

4. The battery assembly of claim 2, wherein, The sealing gasket is arranged around part of the second sub-portion away from the first sub-portion, and part of the second sub-portion away from the first sub-portion extends to a side surface of the sealing gasket away from the second sealing layer; the busbar further comprises a third sub-portion, the first sub-portion, the second sub-portion and the third sub-portion being connected in sequence, and at least part of the third sub-portion being laid on the side surface of the sealing gasket away from the second sealing layer.

5. The battery assembly of claim 3, wherein, The battery assembly further comprises a junction box arranged on the second substrate, the first sealing layer, the second sealing layer and the sealing gasket being accommodated in the junction box, and one end of the third sub-portion away from the second sub-portion being connected to a junction terminal in the junction box.

6. The battery assembly of claim 5, wherein, The battery assembly further comprises a filling layer filling the remaining space in the junction box and covering the exposed surface of the first sealing layer, the second sealing layer, the sealing gasket and the busbar.

7. The battery assembly of any one of claims 1-6, wherein, The distance between the edge of the first sealing layer and the edge of the through hole is greater than 10 mm.

8. The battery assembly of any one of claims 2-7, wherein, The battery assembly satisfies one or more of the following conditions: (1) the material of the first sealing layer comprises one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer and polyvinyl butyral ester; (2) the thickness of the first sealing layer is 0.1-3 mm; (3) the material of the second sealing layer comprises one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, ethylene-vinyl acetate copolymer, thermoplastic polyurethane elastomer and polyvinyl butyral ester. (4) the first sealing layer has a thickness of 0.1mm-3mm; (5) the material of the sealing gasket comprises at least one of semi-tempered ultra-white float glass, fully-tempered ultra-white float glass, non-tempered ultra-white float glass, high-borosilicate glass, embossed glass, ceramic and photovoltaic backsheet, or a combination thereof; (6) the sealing gasket has a thickness of 0.1mm-5mm.

9. The battery assembly of any one of claims 1-8, wherein, The battery comprises a perovskite solar cell.

10. A method for manufacturing a battery assembly, comprising: providing a first substrate and forming a battery on the first substrate; providing a busbar and electrically connecting one end of the busbar to the battery; providing a second substrate and disposing the second substrate on the battery, the second substrate having at least one through hole penetrating through the second substrate, and the other end of the busbar being led out from the through hole; forming a first sealing layer above the second substrate and the through hole, the first sealing layer being disposed around part of the busbar; wherein the part of the busbar above the first sealing layer at least comprises sequentially connected first and second subparts; firstly bending the busbar so that the first subpart is laid on a side surface of the first sealing layer away from the second substrate; forming a second sealing layer covering the first subpart and at least part of the first sealing layer, and causing at least part of the second subpart to be laid on a side wall of the second sealing layer or surrounded by the second sealing layer.

11. The manufacturing method according to claim 10, wherein, After forming the second sealing layer on the first sealing layer, the method further comprises: providing a sealing gasket and disposing the sealing gasket on the second sealing layer.

12. The manufacturing method according to claim 11, wherein, After disposing the sealing gasket on the second sealing layer, the method further comprises performing a lamination process on the battery assembly.

13. The manufacturing method according to any one of claims 11 to 12, wherein, The busbar further comprises a third subpart, and the first, second and third subparts are sequentially connected; the first subpart extends to an edge of the second sealing layer; causing at least part of the second subpart to be laid on a side wall of the second sealing layer comprises: After disposing the sealing gasket on the second sealing layer, the method further comprises: secondly bending the busbar so that the second subpart extends to an edge of a side surface of the sealing gasket away from the second sealing layer on a side wall of the second sealing layer and the sealing gasket, and at least part of the third subpart is laid on the side surface of the sealing gasket away from the second sealing layer; or at least part of the second subpart is surrounded by the second sealing layer; after disposing the sealing gasket on the second sealing layer, the method further comprises:

14. The manufacturing method according to claim 13, wherein, secondly bending the busbar so that part of the second subpart away from the first subpart extends to an edge of a side surface of the sealing gasket away from the second sealing layer on a side wall of the sealing gasket, and at least part of the third subpart is laid on the side surface of the sealing gasket away from the second sealing layer. After secondly bending the busbar, the method further comprises: providing a junction box and disposing the junction box on the second substrate, the first sealing layer, the second sealing layer and the sealing gasket being contained in the junction box; connecting the end of the third sub-portion distal to the second sub-portion to a terminal located in the junction box.

15. The manufacturing method of claim 14, wherein, After connecting the end of the third sub-portion distal to the second sub-portion to a terminal located in the junction box, the method further comprises: injecting a filler layer in the junction box, the filler layer filling the remaining space in the junction box and covering the first sealing layer, the second sealing layer, the sealing gasket and the exposed surface of the busbar.

16. An electrical consumer comprising the battery assembly of any one of claims 1 to 9 for providing electrical energy.

17. An electrical generator comprising the battery assembly of any one of claims 1 to 9.

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