Battery module, electric device, and power

Abstract

The utility model discloses a battery assembly, a power utilization device and a power generation device. The battery assembly comprises a first substrate, a second substrate located on the first substrate, and a battery packaged between the first substrate and the second substrate, the sealing layer comprises a first sub-part and at least one second sub-part connected with the first sub-part, the second sub-part penetrates through the battery and is in contact with the surface of the side, close to the battery, of the first substrate, and the first sub-part is located between the second substrate and the battery and covers the battery and the second sub-part.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery assembly, a power consumption device, and a power generation device. BACKGROUND

[0002] The structure of a photovoltaic assembly generally comprises a front plate glass, a back plate glass arranged oppositely, and a solar cell encapsulated between the front plate glass and the back plate glass, and the solar cell is generally bonded with the back plate glass by an encapsulating adhesive film.

[0003] However, the photovoltaic assembly in the industry currently faces the problem of insufficient bonding force after pressing, which causes the photovoltaic assembly to fail to pass the dynamic and static load test. UTILITARIAN CONTENT

[0004] To solve the above technical problems, the present application provides a battery assembly to improve the mechanical synergy between the first substrate and the second substrate and increase the bonding force inside the battery assembly.

[0005] The present application is implemented by the following technical solutions.

[0006] The first aspect of the present application 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; a sealing layer comprising a first subpart and at least one second subpart connected to the first subpart, the second subpart penetrating the battery and contacting a side surface of the first substrate close to the battery, and the first subpart being located between the second substrate and the battery and covering the battery and the second subpart.

[0007] In the present application, the battery assembly comprises a sealing layer, the sealing layer comprises a first subpart located between the battery and the second substrate, and a second subpart contacting a side surface of the first substrate close to the battery, the first subpart is bonded with the second substrate, the second subpart is bonded with the first substrate, and the first subpart and the second subpart are connected, thus the first subpart and the second subpart provide a mechanical channel between the first substrate and the second substrate, increase the mechanical synergy between the first substrate and the second substrate, and further improve the firmness of the combination of the first substrate, the battery, and the second substrate with each other.

[0008] In any embodiment, the battery comprises a first region located on both side edges of the battery along a first direction, and the second subpart is arranged in at least one of the first regions; wherein the first direction is parallel to the plane of the first substrate, thus the second subpart arranged in the first region can increase the bonding force inside the battery assembly while relieving the stress of the first region.

[0009] In any of the embodiments, the solar cell further comprises a second region between the first regions, the second region has at least one preset region, and the second sub-portion is arranged in the preset region or in the first region and the preset region. In this way, the second sub-portion can also be arranged in the preset region, which can at least partially eliminate the defects of the solar cell in the preset region while increasing the internal bonding force of the solar cell assembly, thereby improving the performance of the solar cell.

[0010] In any of the embodiments, the solar cell comprises at least one sub-cell, the sub-cell comprises a first electrode layer, a functional layer and a second electrode layer stacked in sequence away from the first substrate, the first electrode layer, the functional layer and the second electrode layer have an overlapping area in the orthographic projection on the first substrate plane, and the preset region falls within the overlapping area in the orthographic projection on the first substrate plane. In this way, the preset region is arranged in the active region of the sub-cell, which avoids damaging the conductive material within the P2 scribe line by the second sub-portion and reduces the electrical connection performance between the adjacent two sub-cells.

[0011] In any of the embodiments, the ratio of the width of any of the first regions in the first direction to the width of the solar cell in the first direction ranges from 3% to 14%. The first region comprises a stress concentration area of the solar cell, and thus the second sub-portion can effectively relieve the stress of the part of the solar cell in the stress concentration area.

[0012] In any of the embodiments, the size of the second sub-portion in any direction parallel to the first substrate plane ranges from 0.1 μm to 3000 μm, and optionally, from 1 mm to 2 mm. In this way, by controlling the size within the above range, the wettability of the material layer of the sealing layer in a flow state to the to-be-filled structure is increased when the lamination process is performed on the solar cell assembly, so that the material of the sealing layer can flow into the to-be-filled structure.

[0013] In any of the embodiments, at least one of the second sub-portions is a strip structure arranged in at least one of the first regions and extending in a second direction to increase the application scenarios; wherein the second direction intersects the first direction and is parallel to the first substrate plane.

[0014] In any of the embodiments, the size of the strip structure in the first direction ranges from 0.1 μm to 3000 μm, and optionally, from 1 mm to 2 mm; and the extension length of the strip structure in the second direction is less than or equal to the extension length of the solar cell in the second direction. In this way, the wettability and filling effect of the material layer of the sealing layer in a flow state to the to-be-filled structure are increased when the lamination process is performed on the solar cell assembly.

[0015] In any of the embodiments, a ratio of a sum of cross-sectional areas of all the second sub-sections in a direction parallel to the first substrate to a cross-sectional area of the battery in the direction parallel to the first substrate is less than a first preset value. In this way, on the one hand, the adhesion of the battery assembly can be increased, and on the other hand, the power generation of the battery assembly can be avoided or reduced.

[0016] In any of the embodiments, the battery includes a plurality of sub-batteries arranged in sequence on the first substrate; the number of the second sub-sections is a plurality, each of the sub-batteries is penetrated by at least one of the second sub-sections, and among any two of the sub-batteries, a difference between a sum of cross-sectional areas of all the second sub-sections penetrating one of the sub-batteries and a sum of cross-sectional areas of all the second sub-sections penetrating the other of the sub-batteries in a direction parallel to the first substrate is less than a second preset value. In this way, the internal connection current of the battery tends to be consistent, which helps to improve the performance of the battery assembly.

[0017] In any of the embodiments, the material of the sealing layer includes one or more of polyolefin elastomer material, polyethylene foam and ethylene-vinyl acetate copolymer. The material of the sealing layer has good adhesion and good flowability during lamination, so that the adhesion and bonding force of the sealing layer to the first substrate, the second substrate and the solar cell can be increased, and the filling performance of the liquid sealing layer material layer to the structure to be filled can be increased.

[0018] In any of the embodiments, the battery includes a light-absorbing layer, and the light-absorbing layer includes one or more of a perovskite light-absorbing layer, an amorphous silicon light-absorbing layer, a copper-indium-gallium-selenium light-absorbing layer, a cadmium telluride light-absorbing layer, a gallium arsenide light-absorbing layer and an organic dye light-absorbing layer. The above-mentioned light-absorbing layer can be used to prepare a thin-film solar cell with a light-absorbing layer thickness of microns or nanometers, so as to increase the application scenarios of the battery assembly.

[0019] The second aspect of the present application further provides a power consuming device, which includes the battery assembly of the first aspect of the present application.

[0020] The third aspect of the present application further provides a power generating device, which includes the battery assembly of the first aspect of the present application.

[0021] Details of one or more embodiments of the present disclosure are presented in the following drawings and description. Other features and advantages of the present disclosure will become apparent from the description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0023] Figure 1a A schematic block diagram of the power consuming device provided by some embodiments of the present disclosure; Figure 1b A schematic block diagram of the power generating device provided by some embodiments of the present disclosure;

[0024] Figure 2 A structural schematic diagram of the battery assembly provided by some embodiments of the present disclosure;

[0025] Figure 3a A top view schematic diagram of the battery before forming a to-be-filled structure according to some embodiments of the present disclosure; Figure 3b A top view schematic diagram of the battery after forming a second sub-portion according to some embodiments of the present disclosure;

[0026] Figure 4a A sectional structural schematic diagram taken along the line AA' in Figure 3b Figure 4b A structural schematic diagram of the functional layer in Figure 4a

[0027] Figure 5 A top view schematic diagram of the battery after forming a second sub-portion according to some other embodiments of the present disclosure;

[0028] Figure 6 and Figure 7 A stress distribution diagram obtained by stress simulation of the battery provided by some embodiments of the present disclosure.

[0029] Explanation of reference signs:

[0030] 1 power consuming device; 2 power generating device; 100 battery assembly; 11 first substrate; 12 second substrate; 13 battery; 131 first region; 132 second region; 133 preset region; 14 sub-battery; 141 first electrode layer; 142 functional layer; 1421 first transfer layer; 1422 light absorption layer; 1423 second transfer layer; 143 second electrode layer; 15 sealing layer; 151 first sub-portion; 152 second sub-portion; 16 encapsulation layer; 17 defect; 18 strip structure; T to-be-filled structure. DETAILED DESCRIPTION

[0031] ​​Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure can be embodied in many forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0032] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. It will be apparent, however, to one of ordinary skill in the art that the present disclosure can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to unnecessarily obscure the present disclosure.

[0033] In the drawings, the size of layers, regions, elements, and the like can be exaggerated for clarity. Like reference numerals can represent like elements throughout the several figures.

[0034] It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. It will also be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms since such terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section.

[0035] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and / or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, then a dependent element or feature described as "below" or "beneath" another element or feature is oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" or "beneath" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] The photovoltaic module generally comprises a front plate glass, a solar cell, an encapsulation adhesive film and a back plate glass arranged in sequence from bottom to top, and the solar cell is bonded with the back plate glass through the encapsulation adhesive film, wherein the solar cell can be a thin-film solar cell, and generally comprises a lower electrode layer, a functional layer and an upper electrode layer distributed in sequence from bottom to top. Before the photovoltaic module is put on the market, it generally needs to be subjected to IEC61215 dynamic and static load tests, for example, a load test suction cup can be used to apply a pulling force to the front plate glass for testing. However, the photovoltaic modules in the industry at present are faced with the problem of insufficient bonding force after pressing, which leads to the fact that the photovoltaic module cannot pass the dynamic and static load tests.

[0038] The inventors of the present application have found through research that the encapsulation adhesive film has a strong bonding force with the back plate glass, however, the encapsulation adhesive film is bonded with the solar cell only through the upper electrode, the interaction force between different film layers of the solar cell is small, and the binding force is weak, when the load test is performed, the front plate glass and the back plate glass cannot conduct load through effective medium, the front plate glass lacks mechanical synergy of the back plate glass when being stressed, which leads to the fact that the front plate glass is stressed alone, and further leads to the fact that the photovoltaic module is damaged and cannot pass the dynamic and static load tests.

[0039] Based on this, the inventors propose a technical solution in which the battery assembly includes a sealing layer, the sealing layer includes a first sub-portion located between the battery and the second substrate, and a second sub-portion in contact with the side surface of the first substrate close to the battery, the first sub-portion is bonded to the second substrate, the second sub-portion is bonded to the first substrate, and the first sub-portion and the second sub-portion are connected, in this way, the first sub-portion and the second sub-portion provide a mechanical channel between the first substrate and the second substrate, increase the mechanical synergy between the first substrate and the second substrate, and further improve the firmness of the combination of the first substrate, the battery, and the second substrate with each other.

[0040] The technical solution described in the embodiments of the present application is applicable to a battery assembly, a power consumption device using the battery assembly, and a power generation device using the battery assembly. Figure 1a The schematic block diagram of the power consumption device 1 provided by some embodiments of the present application includes the 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, for example, a game machine, an electric automobile 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 assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above-mentioned power consumption device 1.

[0041] Figure 1b The schematic block diagram of the power generation device 2 provided by some embodiments of the present application includes the battery assembly 100. The power generation device 2 can also have a control system and a transmission system, and the power generation device 2 provided by the present application adjusts the electric energy generated from the battery assembly 100 to be able to match the electric energy of the power consumption equipment through the control system and the transmission system.

[0042] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the detailed description of the embodiments of the present disclosure, the schematic diagram can be partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the protection scope of the present disclosure herein.

[0043] In the following, the specific embodiments of the present disclosure will be described with reference to the accompanying drawings. Figures 2 to 7 The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the detailed description of the embodiments of the present disclosure, the schematic diagram can be partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the protection scope of the present disclosure herein.

[0044] As shown in the figure, the battery assembly provided in this application embodiment includes: a first substrate 11, a second substrate 12 located on the first substrate 11, and a battery 13 encapsulated between the first substrate 11 and the second substrate 12; a sealing layer 15 including a first sub-part 151 and at least one second sub-part 152 connected to the first sub-part 151, the second sub-part 152 penetrating the battery 13 and contacting the side surface of the first substrate 11 near the battery 13, the first sub-part 151 being located between the second substrate 12 and the battery 13 and covering the battery 13 and the second sub-part 152.

[0045] In some embodiments, the materials of the first substrate 11 and the second substrate 12 may be the same or different. In some embodiments, the first substrate 11 and the second substrate 12 include inorganic substrates made of quartz, sapphire, glass, etc., and transparent plastic substrates made of polyethylene terephthalate, polyethylene terephthalate, polycarbonate, polystyrene, polyethylene, polypropylene, polyphenylene sulfide, polyvinylidene fluoride, tetraacetyl cellulose, brominated phenoxy compounds, aromatic polyamides, polyimides, polystyrene, polyaryl compounds, polysulfones, polyolefins, etc. In one specific embodiment, both the first substrate 11 and the second substrate 12 are glass substrates.

[0046] like Figure 2 As shown, in some embodiments, the edge of the battery 13 is at a predetermined distance from the edge of the first substrate 11 to expose the edge of the first substrate 11; the battery assembly also includes an encapsulation layer 16, which is disposed along the edge of the first substrate 11, and the battery 13 is located between the first substrate 11 and the second substrate 12 and sealed together by the encapsulation layer 16. The material of the encapsulation layer 16 includes, but is not limited to, butyl rubber.

[0047] In some embodiments, the battery 13 includes a solar cell, which can be one or more. If there are multiple solar cells, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the solar cells are connected in series and others in parallel, which can provide higher voltage and capacity. In some embodiments, the battery assembly also includes a busbar (not shown), which is connected to the positive and negative terminals of the battery 13 to draw out the current generated by the battery 13.

[0048] In some embodiments, a solar cell may include one or more sub-cells 14. When there are multiple sub-cells 14, the multiple sub-cells 14 may be connected in series, in parallel, or in a mixed manner.

[0049] like Figure 4a As shown, in some embodiments, the sub-battery 14 includes a first electrode layer 141, a functional layer 142, and a second electrode layer 143 stacked sequentially on the first substrate 11 in a direction away from the first substrate 11.

[0050] In some embodiments, the material of the first electrode layer 141 may be a transparent conductive material, including but not limited to one or more of indium tin oxide (ITO), aluminum zinc oxide (AZO), indium tungsten oxide (IWO), indium cerium 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).

[0051] In some embodiments, the material of the second electrode layer 143 may include a metal electrode material, a carbon material, a transparent conductive material, or a composite electrode material composed of a metal electrode material and a transparent electrode material; wherein, the metal electrode material includes one or more of silver, aluminum, gold, copper, titanium, chromium, nickel, platinum, and palladium, and the carbon material includes graphene, etc. In some embodiments, the material of the second electrode layer 143 includes copper.

[0052] like Figure 4b As shown, in some embodiments, the functional layer 142 includes at least a light-absorbing layer 1422. The light-absorbing layer 1422 can generate electron-hole pairs under the excitation of incident photons, and generate current through the flow of electrons and holes, thereby realizing the conversion from light energy to electrical energy. The light-absorbing layer 1422 can use any suitable mechanism to convert solar energy into electrical energy.

[0053] In some embodiments, the light-absorbing layer 1422 may include one or more of the following: 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. These light-absorbing layers can be used to fabricate thin-film solar cells with light-absorbing layer thicknesses on the micrometer or nanometer scale, thereby expanding the application scenarios of the technical solutions in this application.

[0054] In some embodiments, the functional layer 142 further includes a first transport layer 1421 located between the first electrode layer 141 and the light-absorbing layer 1422, and / or a second transport layer 1423 located between the light-absorbing layer 1422 and the second electrode layer 143. One of the first transport layer 1421 and the second transport layer 1423 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 transport the electron-hole pairs generated by the light-absorbing layer 1422 to the corresponding electrodes, thereby improving the carrier transport capability. Depending on the actual situation, the electron transport layer and the hole transport layer can be provided on both sides of the light-absorbing layer 1422 respectively, or one of them can be provided on one side of the light-absorbing layer 1422, such as providing only a hole transport layer; this is not limited here.

[0055] The electron transport layer material is an n-type semiconductor with electron transport capabilities. Specific materials include, but are not limited to, titanium oxide (TiO2), tin oxide (SnO2), zinc oxide (ZnO), vanadium oxide (V2O5), zinc tin oxide (Zn2SnO4), and fullerene C. 60 (C 60 ), fullerene C 70 (C 70 ) and fullerene derivatives (such as [6,6]-phenyl-C61-butyrate isomethyl ester, PC 61 One or more of BM, etc., without specific restrictions here.

[0056] The hole transport layer material is a p-type semiconductor with hole transport capability. Specific materials include, but are not limited to, one or more of the following: nickel oxide (NiOx), cuprous oxide (Cu2O), molybdenum oxide (MoO3), copper iodide (CuI), cuprous thiocyanate (CuSCN), zinc oxide, 2,2',7,7'-tetratetra(N,N-p-methoxyaniline)-9, 9'-spirodifluorene (Spiro-OMeTAD), poly[bis(4-phenyl)((2,4,6-trimethylphenyl)amine] (PTAA), and [4-(3,6-dimethyl-9H-carbazole-9-yl)butyl]phosphate (Me-4PACz), etc., without specific limitations.

[0057] In some embodiments, in order to further improve the photoelectric conversion efficiency, an interface treatment layer may be added between different film layers in the first electrode layer 141, the functional layer 142 and the second electrode layer 143, such as a passivation layer to passivate perovskite defects, a blocking layer to block hole transport, etc.

[0058] like Figure 4a As shown, in some embodiments, the battery 13 further includes scribe lines P1, P2, and P3. Scribe line P1 penetrates the first electrode layer 141, scribe line P2 penetrates the functional layer 142, and scribe line P3 penetrates the second electrode layer 143 and the functional layer 142. Scribe lines P1, P2, and P3 divide the first electrode layer 141, the functional layer 142, and the second electrode layer 143 into multiple sub-cells 14. Scribe line P2 is filled with conductive material to connect the first electrode layer 141 of one sub-cell 14 and the second electrode layer 143 of an adjacent sub-cell 14, thereby achieving series connection of two adjacent sub-cells 14. In some embodiments, the multiple sub-cells 14 are arranged sequentially along the fourth direction and extend along a third direction that intersects (including perpendicular or oblique to) the fourth direction. Both the third direction and the fourth direction are parallel to the plane of the substrate 11.

[0059] But not limited to, the number of sub-cells 14 can also be 1, for example, the battery 13 can also be a whole piece of battery that is not divided by P1, P2 and P3; or the plurality of sub-cells 14 can also have other arrangement; for example, the plurality of sub-cells 14 can also be arranged in an array on the first substrate 11.

[0060] In some embodiments, the first sub-portion 151 of the sealing layer 15 is disposed between the first substrate 11 and the second substrate 12 and is surrounded by the encapsulation layer 16 (the first sub-portion 151 can also cover the area provided with the encapsulation layer 16), and covers the battery 13, for sealing the battery 13.

[0061] In this application, the sealing layer 15 further includes a second sub-portion 152, the first sub-portion 151 is bonded to the second substrate 12, and the second sub-portion 152 is in contact with the side surface of the first substrate 11 close to the battery 13 and is bonded to the first substrate 11, and the first sub-portion 151 and the second sub-portion 152 are connected, so that the first sub-portion 151 and the second sub-portion 152 provide a mechanical channel between the first substrate 11 and the second substrate 12, increase the mechanical synergy between the first substrate 11 and the second substrate 12, and further improve the adhesion and firmness between the first substrate 11, the second substrate 12 and the battery 13, so as to help the battery assembly pass the dynamic and static load test.

[0062] In actual operation, forming the battery assembly at least includes the following steps: first, providing the first substrate 11 and forming the battery 13 on the first substrate 11; then, forming the to-be-filled structure T that penetrates the battery 13 and exposes the first substrate 11, which can be a through hole or a through groove structure; then, forming a material layer of the sealing layer 15 on the battery 13, and providing the second substrate 12, and laying the second substrate 12 on the material layer of the sealing layer 15; then, using a lamination process to press the battery assembly, so that the material layer of the sealing layer 15 changes from a solid state to a liquid state, flows to fill the to-be-filled structure T to form the second sub-portion 152, and the remaining material layer of the sealing layer 15 covering the second sub-portion 152 and the battery 13 constitutes the first sub-portion 151.

[0063] In some embodiments, the material of the sealing layer 15 includes one or more of polyolefin elastomer material (POE), polyethylene foam (EPE) and ethylene-vinyl acetate copolymer (EVA), and the material of the sealing layer 15 has good adhesion and good flowability during lamination, so as to increase the adhesion and bonding force of the sealing layer 15 with the first substrate 11, the second substrate 12 and the solar cell, and at the same time, the filling performance of the liquid material layer of the sealing layer 15 to the to-be-filled structure T can be increased.

[0064] But not limited to, the material of the sealing layer 15 can also include one or more of butyl rubber, polyisobutylene, polyisoprene, polyolefin elastomer, thermoplastic polyurethane elastomer, and polyvinyl butyral, etc. to increase the scene applicability.

[0065] In some embodiments, the number of the second sub-parts 152 can be multiple, and the arrangement of the multiple second sub-parts 152 can further increase the mechanical synergy and the internal adhesion of the battery assembly between the first substrate 11 and the second substrate 12. In some embodiments, the multiple second sub-parts 152 can be relatively uniformly distributed at different positions of the battery 13 to avoid too few second sub-parts 152 at a local position, which may

[0066] It can be understood that the more the area occupied by the second sub-parts 152, the better the effect of increasing the internal adhesion of the battery assembly. However, the area occupied by the second sub-parts 152 cannot be too large, otherwise it may cause a large loss of power generation of the battery assembly. In some embodiments, the ratio of the sum of the cross-sectional areas of all the second sub-parts 152 in the direction parallel to the first substrate 11 to the cross-sectional area of the battery 13 in the direction parallel to the first substrate 11 is less than a first preset value to avoid a large loss of power generation of the battery assembly caused by the area occupied by the second sub-parts 152 being too large. In some embodiments, the first preset value can be between 1% and 3% (including the end value), for example, 2%. In the case where the first preset value is 2%, the ratio of the sum of the cross-sectional areas of all the second sub-parts 152 in the direction parallel to the first substrate 11 to the cross-sectional area of the battery 13 in the direction parallel to the first substrate 11 can be 2%, 1.9%, 1.5%, 1%, 0.5%, 0.1%, etc. By controlling the area ratio within the above range, on the one hand, the effect of increasing the internal adhesion of the battery assembly can be achieved, and on the other hand, the loss of power generation of the battery assembly can be avoided or reduced.

[0067] In some embodiments, in the case that the battery 13 comprises a plurality of sub-batteries 14, the second sub-sections 152 are in a plurality, and each sub-battery 14 is penetrated by at least one second sub-section 152. In some embodiments, among any two sub-batteries 14, the sum of the cross-sectional areas of all the second sub-sections 152 penetrating one of the sub-batteries 14 in the direction parallel to the first substrate 11 is less than a second preset value from the sum of the cross-sectional areas of all the second sub-sections 152 penetrating the other of the sub-batteries 14 in the direction parallel to the first substrate 11. In this way, the areas occupied by the second sub-sections 152 in the plurality of sub-batteries 14 are less different, and the internal connection level current of the battery 13 is more consistent, which helps to improve the performance of the battery assembly. Here, the sum of the cross-sectional areas of all the second sub-sections 152 penetrating the sub-battery 14 in the direction parallel to the first substrate 11 refers to the sum of the cross-sectional areas of the parts of all the second sub-sections 152 penetrating the sub-battery 14 in the direction parallel to the first substrate 11, which are located in the active area of the sub-battery 14.

[0068] Further, among any two sub-batteries 14, the sum of the cross-sectional areas of all the second sub-sections 152 penetrating one of the sub-batteries 14 in the direction parallel to the first substrate 11 can be equal to the sum of the cross-sectional areas of all the second sub-sections 152 penetrating the other of the sub-batteries 14 in the direction parallel to the first substrate 11, so as to make the internal connection level current of the battery 13 consistent and further improve the performance of the battery assembly.

[0069] As shown in FIG. 3, in some embodiments, the battery 13 comprises a first region 131 located at the edges of the battery 13 on both sides in the first direction. In some embodiments, the battery 13 further comprises a second region 132 located between the two first regions 131. In some embodiments, the first region 131 can be a stress concentration area of the battery 13. Before the structure to be filled T is formed in the battery 13, the stress distribution in the part of the battery 13 located in the stress concentration area is more concentrated and the average stress is larger than that in other parts of the battery 13. In some embodiments, the first direction is parallel to the plane of the first substrate 11 and can be the same as the extension direction of the sub-battery 14 (i.e. the third direction).

[0070] In some embodiments, the ratio of the width of any first region 131 in the first direction to the width of the battery in the first direction is in the range of 3%-14% (including the end values), such as 3%, 6.2%, 7%, 10%, 12%, 14%, etc.

[0071] Figure 6 and Figure 7 are stress distribution diagrams obtained by stress simulation of the battery 13 based on the von Mises criterion, respectively; wherein, Figure 6 is a stress distribution diagram obtained by stress simulation of the battery 13 with a size of 1m x 2m before the structure to be filled T is formed, Figure 7The stress distribution diagram is obtained by stress simulation of a battery 13 with dimensions of 1.2m × 2.4m before the formation of the structure to be filled T.

[0072] like Figure 6 As shown, the stress concentration area (i.e., the first region 131) of battery 13 is distributed on both sides of the battery 13 in the first direction, and the stress value at the point of maximum stress is 7.66 × 10⁻⁶. 7 N / cm 2 Located in the first region 131; the stress value at the point of minimum stress is 1.56 × 10⁻⁶. 3 N / cm 2 The first region 131 is located in the middle region of the battery 13 (i.e., the second region 132); wherein, the width of the first region 131 in the first direction is approximately 124.32 mm, and the ratio of the width of the first region 131 in the first direction to the width of the battery 13 in the first direction (2 mm) is approximately 6.2%. Figure 6 As shown, the first region 131 of the battery 13 is distributed on both sides of the battery 13 in the first direction, and the stress value at the point of maximum stress is 7.137 × 10⁻⁶. 7 N / cm 2 Located in the first region 131; the stress value at the point of minimum stress is 4.693 × 10⁻⁶. 3 N / cm 2 The first region 131 is located in the second region 132 of the battery 13; wherein the width of the first region 131 in the first direction is approximately 168.32 mm, and the ratio of the width of the first region 131 in the first direction to the width of the battery 13 in the first direction (2.4 mm) is approximately 7%. Here, the first direction can be the direction of extension of the long side of the battery 13.

[0073] In some embodiments, the second sub-part 152 may be disposed within at least one first region 131 of the battery 13. The second sub-part 152 located within the first region 131 may alleviate the stress in the first region 131, thereby reducing the adverse effects of stress on the battery 13.

[0074] In some embodiments, the battery 13 further includes a preset region 133. For example... Figure 3a As shown, before the structure T to be filled is formed in the battery 13, there is a defect 17 in the preset area 133 of the battery 13. The defect 17 includes pinholes, yellowing, etc. located on the surface of the battery 13. The defect 17 of the battery 13 may be located in the first area 131 and / or the second area 132, and the preset area 133 may be located in the first area 131 and / or the second area 132.

[0075] In some embodiments, when the battery 13 includes the preset region 133, the second sub-portion 152 can be disposed in the preset region 133 or the first region 131 and the preset region 133. Wherein, after the second sub-portion 152 is formed, the defect 17 in the preset region 133 is at least partially removed; in the case that the size of the defect 17 is less than or equal to the area of the cross section of the second sub-portion 152 to be formed in the direction parallel to the plane of the first substrate 11, the defect 17 in the preset region 133 can be completely removed. In this way, by disposing the second sub-portion 152 in the preset region 133, the defect 17 of the battery 13 in the preset region 133 can be partially or completely removed while the internal bonding force of the battery assembly is increased, thereby improving the performance of the solar cell.

[0076] In some embodiments, the orthographic projection of the first electrode layer 141, the functional layer 142 and the second electrode layer 143 of the sub-cell 14 on the plane of the first substrate 11 has an overlapping region Z, and the orthographic projection of the preset region 133 on the plane of the first substrate 11 falls within the overlapping region Z. In actual operation, the overlapping region of the first electrode layer 141, the functional layer 142 and the second electrode layer 143 of the sub-cell 14 in the vertical direction is the active region of the sub-cell 14, that is, the orthographic projection of the active region of the sub-cell 14 on the plane of the first substrate 11 coincides with the overlapping region Z; in the case that the number of sub-cells 14 is multiple, between the adjacent two sub-cells 14, the region where the P1 scribe line, the P2 scribe line and the P3 scribe line are located is the dead region of the sub-cell 14. In some embodiments of the present application, the second sub-portion 152 is located in the active region of the battery 13, so that the damage of the second sub-portion 152 to the conductive material located in the P2 scribe line can be avoided, and the electrical connection performance between the adjacent two sub-cells 14 can be reduced.

[0077] In actual operation, the second sub-portion 152 can be preferentially disposed in the region of the battery 13 having the defect 17 before the structure T to be filled is formed, and the second sub-portion 152 can be preferentially formed at the defect 17 with a larger size; in some embodiments, in the case that the battery 13 has less or no defect 17 before the structure T to be filled is formed, the second sub-portion 152 can also be disposed in the first region 131. In the case that the battery 13 includes multiple sub-cells 14, the position of the second sub-portion 152 can be set according to the defect condition of each sub-cell 14. For example:

[0078] As shown in Figure 3a and Figure 3b , the sub-cell 14 includes a first sub-cell C1, a second sub-cell C2 and a third sub-cell C3; as shown in Figure 3a , no defect 17 is found on the first sub-cell C1, as shown in Figure 3bAs shown, five second sub-sections 152 can be formed in the first region 131 of the first sub-cell C1, and the second sub-sections 152 can be distributed as evenly as possible in the two first regions 131 located on both side edges of the first sub-cell C1 along the first direction; as Figure 3a As shown, 11 defects 17 are found on the second sub-cell C2; as Figure 3b As shown, the cross-sectional sizes of the 11 defects 17 can be sorted from large to small, and five second sub-sections 152 are correspondingly arranged in the regions where the first to fifth defects 17 are located (i.e., the preset regions 133 of the second sub-cell C2); as Figure 3a As shown, 3 defects 17 are found on the third sub-cell C3, as Figure 3b As shown, three second sub-sections 152 can be formed in the regions where the 3 defects 17 are located (i.e., the preset regions 133 of the third sub-cell C3), and two second sub-sections 152 can be additionally formed in the first region 131 of the third sub-cell C3; and so on, at least one second sub-section 152 is formed on each of the plurality of sub-cells 14. Here, the defects 17 can be found by visual inspection or a device, which can be an optical device capable of identifying the defects 17.

[0079] In some embodiments, the cross-sectional shape of the second sub-section 152 along the direction parallel to the plane of the first substrate 11 can also include one or a combination of a circle, an ellipse, a polygon, and an irregular shape, so as to increase the applicability of the scenario.

[0080] In some embodiments, the size of the second sub-section 152 with any cross-sectional shape in any direction parallel to the plane of the first substrate 11 ranges between 0.1 μm and 3000 μm (including the end values, such as 0.1 μm, 500 μm, 1000 μm, 1500 μm, 2000 μm, 2500 μm, 3000 μm, etc.), and optionally, between 1 mm and 2 mm (including the end values, such as 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, etc.). In this way, by controlling the size within the above range, the wettability of the material layer of the sealing layer 15 in a flow state to the to-be-filled structure T is increased when the battery assembly is subjected to a lamination process, so that the material of the sealing layer 15 can flow into the to-be-filled structure T.

[0081] In actual operation, the laser process can be used to form the to-be-filled structure T, and the size and cross-sectional shape of the to-be-filled structure T and the second sub-part 152 in the direction parallel to the plane of the first substrate 11 can be related to the size and shape of the laser spot. In some specific embodiments, the shape of the cross-section in the direction parallel to the plane of the first substrate 11 can be circular, and the diameter of the second sub-part 152 can range from 0.1 μm to 3000 μm, for example, 0.1 μm, 500 μm, 1000 μm, 1500 μm, 2000 μm, 2500 μm, 3000 μm, etc.; further, the diameter of the second sub-part 152 can range from 1 mm to 2 mm, for example, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, etc.

[0082] Figure 3b The second sub-part 152 shown has a uniform size in any direction parallel to the plane of the first substrate 11. However, it is not limited thereto, and as shown in FIG. 2B, in some embodiments, at least one second sub-part 152 can also be a strip-shaped structure 18 arranged in at least one first region 131 and extending in a second direction to increase the applicability of the scene. Here, the second direction is parallel to the plane of the first substrate 11 and can be perpendicular or oblique to the first direction, and the second direction can be the same as the arrangement direction (i.e., the fourth direction) of the plurality of sub-cells 14. Figure 5

[0083] In some embodiments, the extension length of the strip-shaped structure 18 in the second direction is less than or equal to the extension length of the cell 13 in the second direction. Figure 5 The strip-shaped structure 18 shown is respectively located at the two side edges of the sub-cell 14 in the first direction, and the extension length of the strip-shaped structure 18 in the second direction is less than the extension length of the sub-cell 14 in the second direction. However, it is not limited thereto, and the strip-shaped structure 18 located in the first region 131 can also continuously extend in the second direction within the plurality of sub-cells 14, and the extension length of the strip-shaped structure 18 in the second direction is less than or equal to the extension length of the cell 13 in the second direction.

[0084] In some embodiments, the size of the strip-shaped structure 18 in the first direction ranges from 0.1 μm to 3000 μm (including the end point values, for example, 0.1 μm, 500 μm, 1000 μm, 1500 μm, 2000 μm, 2500 μm, 3000 μm, etc.), and optionally, from 1 mm to 2 mm (including the end point values, for example, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, etc.), so as to increase the wettability of the material of the flow state sealing layer 15 to the to-be-filled structure T and increase the filling effect of the material layer of the sealing layer 15.

[0085] As shown in FIG. 2B, Figure 6 and Figure 7 ​As shown, in some embodiments, the battery 13 is subjected to greater stress at the portion of the first region 131 closer to the second region 132 than the portion farther from the second region 132, for example, as shown in FIG. 1C. Figure 6 As shown, in some embodiments, the battery 13 is subjected to greater stress at the portion of the first region 131 closer to the second region 132 than the portion farther from the second region 132, for example, as shown in FIG. 1C.

[0086] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; even though the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any manner. The present application 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, characterized in that, include: A first substrate, a second substrate located on the first substrate, and a battery packaged between the first substrate and the second substrate; A sealing layer includes a first sub-part and at least one second sub-part connected to the first sub-part, the second sub-part penetrating the battery and contacting the side surface of the first substrate near the battery, the first sub-part being located between the second substrate and the battery and covering the battery and the second sub-part.

2. The battery assembly according to claim 1, characterized in that, The battery includes a first region located at both edges of the battery along a first direction, and a second sub-part is disposed in at least one of the first regions; wherein the first direction is parallel to the plane of the first substrate.

3. The battery assembly according to claim 2, characterized in that, The battery further includes a second region located between the first regions, the second region having at least one preset region, and the second sub-part being disposed in the preset region or in both the first region and the preset region.

4. The battery assembly according to claim 3, characterized in that, The battery includes at least one sub-cell, which includes a first electrode layer, a functional layer, and a second electrode layer stacked sequentially on the first substrate in a direction away from the first substrate. The orthographic projections of the first electrode layer, the functional layer, and the second electrode layer on the plane of the first substrate have an overlapping area, and the orthographic projection of the preset area on the plane of the first substrate falls into the overlapping area.

5. The battery assembly according to any one of claims 2 to 4, characterized in that, The ratio of the width of any of the first regions in the first direction to the width of the battery in the first direction is between 3% and 14%.

6. The battery assembly according to any one of claims 1 to 5, characterized in that, The dimensions of the second sub-part in any direction parallel to the plane of the first substrate range from 0.1 μm to 3000 μm, and optionally from 1 mm to 2 mm.

7. The battery assembly according to any one of claims 2 to 5, characterized in that, At least one of the second sub-parts is a strip structure, the strip structure being disposed in at least one of the first regions and extending along a second direction; wherein the second direction intersects with the first direction and is parallel to the plane of the first substrate.

8. The battery assembly according to claim 7, characterized in that, The dimensions of the strip structure in the first direction range from 0.1 μm to 3000 μm, and optionally from 1 mm to 2 mm; the extension length of the strip structure in the second direction is less than or equal to the extension length of the battery in the second direction.

9. The battery assembly according to any one of claims 1 to 8, characterized in that, The ratio of the sum of the cross-sectional areas of all the second sub-parts in the direction parallel to the first substrate to the cross-sectional area of ​​the battery in the direction parallel to the first substrate is less than a first preset value.

10. The battery assembly according to any one of claims 1 to 9, characterized in that, The battery includes multiple sub-cells; the number of second sub-parts is multiple, each sub-cell is penetrated by at least one second sub-part, and in any two sub-cells, the difference between the sum of the cross-sectional areas of all the second sub-parts penetrating one of them in the direction parallel to the first substrate and the sum of the cross-sectional areas of all the second sub-parts penetrating the other of them in the direction parallel to the first substrate is less than a second preset value.

11. The battery assembly according to any one of claims 1 to 10, characterized in that, The sealing layer is made of one or more of the following materials: polyolefin elastomer, polyethylene foam, and ethylene-vinyl acetate copolymer.

12. The battery assembly according to any one of claims 1 to 11, characterized in that, The battery includes a light-absorbing layer, which may include one or more of the following: 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.

13. An electrical appliance, characterized in that, The electrical device includes a battery assembly for providing electrical energy as described in any one of claims 1 to 12.

14. A power generation device, characterized in that, The power generation device includes the battery assembly according to any one of claims 1 to 12.

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