Battery assembly and preparation method thereof

Abstract

The invention provides a cell module and a preparation method thereof, and solves the problems of low efficiency and poor operation stability of a solar cell in the prior art. The battery assembly comprises a substrate; the multiple battery units are located on one side of the substrate, and each battery unit comprises a first electrode, at least one functional layer and a second electrode which are stacked in the direction away from the substrate; the plurality of battery units comprise a first battery unit and a second battery unit, the second battery unit comprises a first groove, the first groove penetrates through the functional layer, and a second electrode of the second battery unit fills the first groove and is in contact with a first electrode of the first battery unit; and the first barrier layer is located in the first groove and located between at least part of the functional layer and the second electrode, and the first barrier layer comprises a lead compound.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery assembly and a method for preparing the same. Background Art

[0002] With the development of technology and the continuous growth of human needs, it is particularly important to develop smaller, lighter and thinner energy storage devices. Solar cells, especially perovskite solar cells, have the characteristics of light weight and bendability, and have gradually become one of the research hotspots at this stage. However, the efficiency and operation stability of perovskite solar cells still need to be improved. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a battery assembly and a method for preparing the same, which solve the problems of low efficiency and poor operating stability of solar cells in the prior art.

[0004] In a first aspect, the present application provides a battery assembly, comprising: a substrate; a plurality of battery cells, located on one side of the substrate, the battery cells comprising a first electrode, at least one functional layer, and a second electrode stacked in a direction away from the substrate; the plurality of battery cells comprising a first battery cell and a second battery cell, the second battery cell comprising a first groove, the first groove penetrating the functional layer, the second electrode of the second battery cell filling the first groove and in contact with the first electrode of the first battery cell; and a first barrier layer, located in the first groove and between at least a portion of the functional layer and the second electrode, the first barrier layer comprising a lead compound.

[0005] In combination with the first aspect, in some possible implementations, at least one functional layer includes a photoactive layer, and the first barrier layer is located between the photoactive layer and the second electrode; preferably, at least one functional layer also includes a first charge transport layer, which is located between the photoactive layer and the first electrode; the first barrier layer is not arranged between the first charge transport layer and the second electrode; preferably, at least one functional layer also includes a second charge transport layer, which is located between the photoactive layer and the second electrode; the first barrier layer is not arranged between the second charge transport layer and the second electrode; preferably, the first charge transport layer includes a hole transport layer, and the second charge transport layer includes an electron transport layer.

[0006] In combination with the first aspect, in some possible implementations, the second electrode includes a metal electrode; preferably, the second electrode includes a silver electrode; preferably, the lead compound includes lead iodide.

[0007] In combination with the first aspect, in some possible implementations, a second groove is provided between the first battery cell and the second battery cell, the second electrode of the first battery cell and the second electrode of the second battery cell are disconnected at the second groove, and the functional layer of the first battery cell and the functional layer of the second battery cell are disconnected at the second groove; preferably, the battery assembly also includes a second barrier layer, the second barrier layer is located in the second groove and covers at least part of the side wall of the functional layer; preferably, at least one functional layer includes a photoactive layer, and the second barrier layer covers the side wall of the photoactive layer; preferably, the second barrier layer and the first barrier layer are made of the same material; preferably, the orthographic projection of the second groove on the substrate is located within the range of the orthographic projection of the first electrode of the first battery on the substrate.

[0008] In combination with the first aspect, in some possible implementations, a third groove is arranged between the first battery cell and the second battery cell, and the first electrode of the first battery cell and the first electrode of the second battery cell are disconnected at the third groove; preferably, the orthographic projection of the third groove on the substrate is located on the side of the orthographic projection of the first groove on the substrate away from the first battery cell; preferably, the orthographic projection of the first groove is located within the range of the orthographic projection of the first electrode of the first battery on the substrate; preferably, the first electrode includes a conductive oxide material; preferably, the first electrode includes at least one of fluorine-doped tin dioxide, indium tin oxide, and indium-doped zinc oxide.

[0009] The second aspect of the present application provides a method for preparing a battery assembly, comprising: preparing a plurality of first electrodes on a substrate, the plurality of first electrodes comprising a first battery first electrode and a second battery first electrode; preparing at least one functional layer on a side of the first electrode facing away from the substrate, the at least one functional layer comprising a photoactive layer; patterning the at least one functional layer to form a first groove, the first groove exposing a portion of the first battery first electrode; applying a free lead solution into the first groove and performing an annealing treatment, the free lead solution reacting with halogen ions precipitated on the surface of the photoactive layer to form a first barrier layer; preparing a second electrode layer on a side of the functional layer facing away from the substrate, the second electrode layer filling the first groove; patterning the at least one functional layer and the second electrode layer to form a second groove, the second groove penetrating the at least one functional layer and the second electrode layer.

[0010] In combination with the second aspect, in some possible implementations, the free lead solution includes any one of a lead nitrate solution and a lead acetate solution; and / or the concentration of the free lead solution is greater than or equal to 0.01 mmol / ml and less than or equal to 0.5 mmol / ml; and / or the solvent of the free lead solution includes any one of chlorobenzene, ethanol, toluene, ethyl acetate, and isopropanol; and / or the annealing temperature is 100° C., and the annealing time is greater than or equal to 5 min and less than or equal to 30 min.

[0011] In combination with the second aspect, in some possible implementations, coating the free lead solution into the first groove includes: coating the free lead solution into the first groove by a slit coating method.

[0012] In combination with the second aspect, in some possible implementations, before applying the free lead solution into the first groove, it also includes: using an inert gas to clean the first groove; preferably, patterning at least one functional layer to form the first groove includes: using a laser scribing process to scribble at least one functional layer to form the first groove; preferably, using an inert gas to clean the first groove includes: using a nitrogen gun to clean laser-scribed debris in the first groove.

[0013] In combination with the second aspect, in some possible implementations, the preparation method further includes: coating a free lead solution into the second groove and performing an annealing treatment, wherein the free lead solution reacts with halogen ions precipitated from the surface of the photoactive layer to generate a second barrier layer.

[0014] According to the battery assembly and the preparation method thereof provided in the embodiments of the present application, a first barrier layer is arranged between the functional layer in the first groove and the second electrode. On the one hand, it is used to prevent ions in the functional layer from migrating to the second electrode, causing loss of the second electrode and thus affecting the efficiency and service life of the battery assembly; on the other hand, it is used to block water and oxygen to avoid contact with the photoactive layer, thereby causing degradation of the functional layer and thus affecting the long-term operation stability of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the cross-sectional structure of a battery assembly provided in the first embodiment of the present application.

[0016] Figure 2 A schematic diagram of the cross-sectional structure of a battery assembly provided in the second embodiment of the present application.

[0017] Figure 3 A schematic diagram of a process for preparing a battery assembly according to an embodiment of the present application.

[0018] Figure 4a-4g For execution Figure 3 Schematic diagram of the structure of the intermediate product formed during the preparation method shown. DETAILED DESCRIPTION

[0019] Perovskite has the characteristics of large absorption coefficient, high mobility, long diffusion length and adjustability. Due to its excellent performance, it has ushered in a new era of solar cell research. So far, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has exceeded 26%.

[0020] In the related art, the battery is easily corroded by water and oxygen in the environment during preparation and use, resulting in a decrease in battery life. Taking the perovskite battery assembly as an example, grooves need to be scratched during the preparation of the perovskite battery assembly. In adjacent battery cells, one electrode of one battery cell fills the groove and contacts one electrode of another battery cell to achieve a series connection of adjacent battery cells. As mentioned in the background technology, the efficiency of the perovskite battery assembly needs to be improved.

[0021] In view of this, an embodiment of the present application provides a battery assembly and a method for preparing the same, by covering the cross section of the perovskite layer in the groove with a barrier layer, and using the barrier layer to block the perovskite layer and the electrode, thereby improving the efficiency of the battery assembly.

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] In the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is understood that when a structure is referred to as being "on or under" another structure, the structure may be directly on or under the other structure, or there may be intermediate structures. The same reference numerals always indicate the same structure. The structures mentioned herein include any of a film layer, an element, a device, a component, and an assembly.

[0024] When a structure is referred to as being “connected” to another structure, the structure may be directly connected to the other structure or indirectly connected to the other structure with one or more intervening structures interposed therebetween.

[0025] A first aspect of the present application provides a battery assembly. Figure 1 This is a schematic diagram of the cross-sectional structure of a battery assembly provided in the first embodiment of the present application. Figure 1As shown, the battery assembly includes: a substrate 10, a plurality of battery cells 20 and a first barrier layer 31. Among them, the plurality of battery cells 20 are located on one side of the substrate 10. The battery cell 20 includes a first electrode 21, at least one functional layer 22 and a second electrode 23 stacked in a direction away from the substrate 10. The plurality of battery cells 20 include a first battery cell 210 and a second battery cell 220. The second battery cell 220 includes a first groove G1, and the first groove G1 penetrates the functional layer 22. The second electrode 23 of the second battery cell 220 fills the first groove G1 and contacts the first electrode 21 of the first battery cell 210, thereby realizing a series connection between the first battery cell 210 and the second battery cell 220. The first barrier layer 31 is located in the first groove G1 and between at least part of the functional layer 22 and the second electrode 23. The first barrier layer 31 includes a lead compound. Exemplarily, the lead compound includes lead iodide.

[0026] The substrate 10 is used to provide support and bearing. In one embodiment, the substrate is a transparent substrate, such as a glass substrate. The substrate can be a flexible substrate or a rigid substrate. Exemplary materials of the flexible substrate include transparent polyimide (CPI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), etc.

[0027] At least one functional layer 22 includes a photoactive layer 221. The material of the photoactive layer 221 includes any one of perovskite, antimony selenide, and organic photovoltaic materials. At least one functional layer 22 may also include a first charge transport layer 222, located between the photoactive layer 221 and the first electrode 21. At least one functional layer 22 may also include a second charge transport layer 223, located between the photoactive layer 221 and the second electrode 23. The first barrier layer 31 may be located only between any one functional layer 22 and the second electrode 23, or between all functional layers 22 and the second electrode 23. Exemplarily, the first charge transport layer 222 includes a hole transport layer, and the second charge transport layer 223 includes an electron transport layer.

[0028] The first barrier layer 31, on the one hand, is used to prevent ions in the photoactive layer 221 from migrating into the second electrode 23, causing loss of the second electrode 23, and further affecting the efficiency and service life of the battery assembly; on the other hand, it blocks water and oxygen to avoid contact with the photoactive layer 221, causing degradation of the photoactive layer 221, and further affecting the long-term operation stability of the battery assembly.

[0029] In one embodiment, the first barrier layer 31 is located between the photoactive layer 221 and the second electrode 23. The first barrier layer 31 is not disposed between the first charge transport layer 222 and the second electrode 23, and the first barrier layer 31 is not disposed between the second charge transport layer 223 and the second electrode 23. In other words, the first barrier layer 31 is only disposed between the photoactive layer 221 and the second electrode 23.

[0030] In one embodiment, the orthographic projection of the first groove G1 is located within the orthographic projection range of the first electrode 21 of the first battery cell 210 on the substrate 10 .

[0031] In one embodiment, the first electrode 21 includes a transparent electrode. Thus, when the substrate 10 is also a transparent substrate, sunlight can be transmitted from the substrate 10 to the inside of the battery cell 20, thereby realizing the conversion of solar energy into electrical energy. Exemplarily, the first electrode 21 includes a conductive oxide material. For example, the first electrode 21 includes at least one of indium tin oxide (ITO), fluorine-doped tin oxide (FTO), and indium-doped zinc oxide (IZO).

[0032] In one embodiment, the second electrode 23 comprises a metal electrode, for example, a silver electrode.

[0033] like Figure 1 As shown, a second groove G2 is provided between the first battery cell 210 and the second battery cell 220. The second electrode 23 of the first battery cell 210 and the second electrode 23 of the second battery cell 220 are disconnected at the second groove G2, and the functional layer 22 of the first battery cell 210 and the functional layer 22 of the second battery cell 220 are disconnected at the second groove G2. That is, the second groove G2 is used to separate the second electrode 23 and the functional layer 22 of the adjacent battery cells 20.

[0034] In one embodiment, the orthographic projection of the second groove G2 on the substrate 10 is located within the orthographic projection range of the first electrode 21 of the first battery cell 210 on the substrate 10. That is, in the direction toward the second battery cell 220, the first electrode 21 of the first battery cell 210 protrudes from the functional layer 22 and the second electrode 23 of the first battery cell 210, and the orthographic projection of the functional layer 22 and the second electrode 23 of the second battery cell 220 on the substrate 10 partially overlaps with the orthographic projection of the first electrode 21 of the first battery cell 210 on the substrate 10.

[0035] like Figure 1 As shown, a third groove G3 is provided between the first battery cell 210 and the second battery cell 220, and the first electrode 21 of the first battery cell 210 and the first electrode 21 of the second battery cell 220 are disconnected at the third groove G3. That is, the third groove G3 is used to separate the second electrode 23 and the functional layer 22 of the adjacent battery cells 20. The second groove G2 and the third groove G3 work together to separate the adjacent battery cells 20, so that the adjacent battery cells 20 are independent of each other.

[0036] In one embodiment, the orthographic projection of the third groove G3 on the substrate 10 is located on a side of the orthographic projection of the first groove G1 on the substrate 10 away from the first battery unit 210 .

[0037] According to the battery assembly provided in this embodiment, a first barrier layer 31 is arranged between the functional layer 22 and the second electrode 23 in the first groove G1. On the one hand, it is used to block the ions in the photoactive layer 221 from migrating into the second electrode 23, causing the loss of the second electrode 23, and further affecting the efficiency and service life of the battery assembly; on the other hand, it blocks water and oxygen to avoid contact with the photoactive layer 221, causing degradation of the photoactive layer 221, and further affecting the stability of the long-term operation of the battery assembly.

[0038] Figure 2 This is a schematic diagram of the cross-sectional structure of a battery assembly provided in the second embodiment of the present application. Figure 2 The battery components and Figure 1 The difference of the battery assembly shown is that, in this embodiment, the battery assembly further includes a second barrier layer 32 , which is located in the second groove G2 and covers the side wall of the photoactive layer 221 .

[0039] The second barrier layer 32 and the first barrier layer 31 may be made of the same material or different materials. For example, the second barrier layer 32 and the first barrier layer 31 may be made of the same material. In this case, the second barrier layer 32 may block water and oxygen in the environment, thereby providing protection for the photoactive layer 221.

[0040] The battery assembly and Figure 1 The battery assembly provided in the illustrated embodiment belongs to the same inventive concept. For technical details not described in this embodiment, please refer to the above-mentioned related embodiments and will not be repeated here.

[0041] The second aspect of the present application also provides a method for preparing a battery assembly. Figure 3 A schematic diagram of a process for preparing a battery assembly according to an embodiment of the present application. Figure 3 As shown, the preparation method 300 includes:

[0042] Step S310, preparing a plurality of first electrodes on a substrate, wherein the plurality of first electrodes include a first battery first electrode and a second battery first electrode.

[0043] Step S320: preparing at least one functional layer on the side of the first electrode facing away from the substrate, wherein the at least one functional layer includes a photoactive layer.

[0044] Step S330: patterning at least one functional layer to form a first groove, wherein the first groove exposes a portion of the first electrode of the first battery.

[0045] Step S340, coating a free lead solution into the first groove and performing an annealing treatment, wherein the free lead solution reacts with the halogen ions precipitated on the surface of the photoactive layer to form a first barrier layer.

[0046] The halogen ions in the photoactive layer migrate to the sidewall surface corresponding to the first groove, and the halogen ions react chemically with the free lead solution to generate a first barrier layer. The first barrier layer can act as a passivator for the photoactive layer, passivating the grain boundaries, thereby blocking the halogen ions and preventing the halogen ions from further diffusing into the second electrode 23, thereby delaying the aging of the second electrode 23. At the same time, the first barrier layer can also block water and oxygen, preventing the photoactive layer in the first groove from directly contacting water and oxygen during the subsequent preparation process, thereby further protecting the photoactive layer, preventing the photoactive layer from starting to degrade from the cross section in the first groove, and improving long-term operation stability.

[0047] Exemplarily, the halogen ions include iodide ions. In this case, the iodide ions and the lead ions in the free lead solution undergo the following chemical reaction: Pb 2+ +2I-=PbI2, the generated PbI2 serves as the first barrier layer.

[0048] Exemplarily, the free lead solution is coated into the first groove by a slit coating method.

[0049] In one embodiment, before applying the free lead solution into the first groove, the method further includes: cleaning the first groove with an inert gas.

[0050] Exemplarily, patterning at least one functional layer to form the first groove includes: using a laser scribing process to scribble at least one functional layer to form the first groove. In this case, using an inert gas to clean the first groove includes: using a nitrogen gun to clean laser-scribble debris in the first groove.

[0051] Step S350: preparing a second electrode layer on the side of the functional layer facing away from the substrate, and the second electrode layer fills the first groove.

[0052] Step S360: patterning the at least one functional layer and the second electrode layer to form a second groove, wherein the second groove penetrates the at least one functional layer and the second electrode layer.

[0053] In one embodiment, the preparation method 300 further includes, after step S360, coating a free lead solution into the second groove and performing an annealing treatment, wherein the free lead solution reacts with halogen ions precipitated from the surface of the photoactive layer to form a second barrier layer.

[0054] Figure 4a-4g For execution Figure 3 The schematic diagram of the structure of the intermediate product formed during the preparation method shown in FIG. Figure 4a-4g The execution process of the preparation method is described in detail.

[0055] According to step S310, refer to Figure 4a, a plurality of first electrodes 21 are prepared on the substrate 10. The plurality of first electrodes 21 include a first battery first electrode 211 and a second battery first electrode 212.

[0056] Specifically, first, a conductive layer is prepared on the substrate 10. Exemplarily, the material of the conductive layer includes at least one of indium tin oxide (ITO), fluorine-doped tin oxide (FTO) and indium-doped zinc oxide (IZO).

[0057] It should be noted that this step can be omitted. In this case, a conductive glass substrate, such as a fluorine-doped tin oxide (FTO) glass substrate, can be used. The conductive glass substrate includes a substrate 10 and a conductive layer located on one side of the substrate 10.

[0058] Next, the conductive layer is scribed by laser to form a third groove G3 . The third groove G3 divides the conductive layer into two parts, namely, the first battery first electrode 211 and the second battery first electrode 212 .

[0059] It should be understood that the number of the third grooves G3 formed in this step determines the number of the first electrodes 21, and further determines the number of battery cells 20 formed subsequently. The number of the third grooves G3 can be reasonably selected according to actual needs.

[0060] Next, ultrasonic cleaning is performed using a cleaning agent, isopropyl alcohol, and water in sequence. Each cleaning step takes about 30 minutes. Afterwards, the substrate is dried using nitrogen gas.

[0061] According to step S320, refer to Figure 4b At least one functional layer 22 is prepared on the side of the first electrode 21 facing away from the substrate 10 , and the functional layer 22 includes a photoactive layer 221 .

[0062] Exemplarily, the functional layer 22 further includes a first charge transport layer 222 and a second charge transport layer 223. In a direction away from the substrate 10, the first charge transport layer 222, the photoactive layer 221 and the second charge transport layer 223 are stacked in sequence.

[0063] Taking at least one functional layer 22 including a first charge transport layer 222, a photoactive layer 221 and a second charge transport layer 223 stacked in sequence as an example, step S320 specifically includes: first, by a magnetron sputtering process, a first charge transport material is plated on the side of the first electrode 21 away from the substrate 10 to form a first charge transport layer 222. Secondly, a perovskite precursor solution is coated on the first charge transport layer 222. Then, an annealing treatment is performed on a hot stage. Finally, a thermal evaporation process is used to sequentially evaporate C60 and an electron transport material on the upper surface of the photoactive layer 221 to form a second charge transport layer 223.

[0064] Exemplarily, the first charge transport material is a nickel oxide hole transport layer. In this case, exemplary, Ar / O2=40:0.05 to 40:0.8. For example, Ar / O2=40:0.05, or Ar / O2=40:0.1, or Ar / O2=40:0.3, or Ar / O2=40:0.5, or Ar / O2=40:0.8, etc.

[0065] Exemplarily, the thickness of the first charge transport layer 222 is greater than or equal to 5 nm and less than or equal to 30 nm. For example, the thickness of the first charge transport layer 222 is 10 nm, 15 nm, 20 nm, 25 nm, etc.

[0066] Exemplarily, the gas pressure of the first charge transport material is greater than or equal to 1 mTorr and less than or equal to 6 mTorr. For example, the gas pressure of the first charge transport material is 2 mTorr, 3 mTorr, 4 mTorr, 5 mTorr, etc.

[0067] Exemplarily, the sputtering power of the first charge transport material is greater than or equal to 50 W and less than or equal to 500 W. For example, the sputtering power of the first charge transport material is 100 W, 150 W, 200 W, 250 W, 300 W, 350 W, 400 W, 450 W, etc.

[0068] Exemplarily, the perovskite precursor solution contains at least two of the following four: formamidinium lead iodine (FAI), methylamine lead iodine (MAI), cesium iodide (CsI), and lead iodide (PbI2), of which PbI2 must be included.

[0069] Among them, FAI is an organic-inorganic hybrid perovskite material, which is often used in the preparation of solar cells. MAI is also an organic-inorganic hybrid material in perovskite solar cells, used to improve the photoelectric conversion efficiency. CsI (is used as an additive in perovskite solar cells to improve the performance of the battery. PbI2 is an inorganic salt commonly used in the preparation of perovskite solar cells to promote the formation of perovskite phase.

[0070] Exemplarily, the annealing temperature is 150° C., and the annealing time is greater than or equal to 10 min and less than or equal to 40 min, to generate the three-dimensional perovskite photoactive layer 221 .

[0071] Exemplarily, the electron transport material is BCP, and its chemical formula is, for example, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline.

[0072] Exemplarily, the film thickness of C60 is greater than or equal to 5 nm and less than or equal to 50 nm. For example, the film thickness of C60 is 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, etc.

[0073] Exemplarily, the film thickness of the electron transport material is greater than or equal to 1 nm and less than or equal to 30 nm. For example, the film thickness of the electron transport material is 5 nm, 10 nm, 15 nm, 20 nm, 25 nm, etc.

[0074] According to step S330, refer to Figure 4c , at least one functional layer is patterned to form a first groove G1.

[0075] For example, at least one functional layer is laser scribed to form a first groove G1. The first groove G1 sequentially penetrates the first charge transport layer 222, the photoactive layer 221 and the second charge transport layer 223 in the thickness direction of the substrate 10, and the first groove G1 exposes a portion of the first battery first electrode 211.

[0076] According to step S340, refer to Figure 4d , a free lead solution is coated into the first groove G1 and annealed. The free lead solution reacts with the halogen ions precipitated on the surface of the photoactive layer 221 to form the first barrier layer 31 .

[0077] Specifically, firstly, a nitrogen gun is used to blow away the debris generated by laser scribing in the first groove G1; secondly, a slit coating method is used to coat a free lead solution in the first groove G1; and then, an annealing treatment is performed.

[0078] Exemplarily, the free lead solution includes any one of a lead nitrate solution and a lead acetate solution.

[0079] Exemplarily, the concentration of the free lead solution is greater than or equal to 0.01 mmol / ml and less than or equal to 0.5 mmol / ml. For example, the concentration of the free lead solution is 0.1 mmol / ml, 0.2 mmol / ml, 0.3 mmol / ml, 0.4 mmol / ml, etc.

[0080] Exemplarily, the solvent of the free lead solution includes any one of chlorobenzene, ethanol, toluene, ethyl acetate, and isopropanol.

[0081] Exemplarily, the temperature of the annealing treatment is 100° C., and the time of the annealing treatment is greater than or equal to 5 min and less than or equal to 30 min. For example, the annealing time is 10 min, 15 min, 20 min, 25 min, etc.

[0082] According to step S350, refer to Figure 4eA second electrode layer is prepared on the side of the functional layer 22 facing away from the substrate 10. The second electrode layer fills the first groove G1 and contacts the first electrode 211 of the first battery.

[0083] For example, a thermal evaporation process is used to evaporate metal Ag on the side of the functional layer 22 facing away from the substrate 10 to form the second electrode layer. Exemplarily, the thickness of the second electrode layer is about 100 nm.

[0084] According to step S360, refer to Figure 4f , at least one functional layer and the second electrode layer are patterned to form a second groove G2, which penetrates at least one functional layer 22 and the second electrode layer. The second electrode layer is divided into a plurality of second electrodes 23 independent of each other by the second groove G2. Thus, adjacent first battery cells 210 and second battery cells 220 are formed, and the first battery cells 210 and the second battery cells 220 are connected in series.

[0085] In one embodiment, after step S360, the method further includes: referring to Figure 4g , a free lead solution is coated into the second groove G2 and annealing is performed, and the free lead solution reacts with the halogen ions precipitated on the surface of the photoactive layer 221 to form a second barrier layer 32 .

[0086] The step of forming the second barrier layer 32 in the second groove G2 is the same as the step of forming the first barrier layer 31 in the first groove G1 , and the specific technical details are not repeated here.

[0087] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0088] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery assembly, It is characterized in that include: substrate; A plurality of battery cells are located on one side of the substrate, the battery cells comprising a first electrode, at least one functional layer, and a second electrode stacked in a direction away from the substrate; the plurality of battery cells comprise a first battery cell and a second battery cell, the second battery cell comprises a first groove, the first groove penetrates the functional layer, the second electrode of the second battery cell fills the first groove and contacts the first electrode of the first battery cell; as well as The first barrier layer is located in the first groove and between at least a portion of the functional layer and the second electrode, and the first barrier layer includes a lead compound.

2. The battery assembly according to claim 1, It is characterized in that At least one of the functional layers comprises a photoactive layer, and the first barrier layer is located between the photoactive layer and the second electrode; Preferably, at least one of the functional layers further comprises a first charge transport layer, which is located between the photoactive layer and the first electrode; and the first barrier layer is not disposed between the first charge transport layer and the second electrode; Preferably, at least one of the functional layers further comprises a second charge transport layer located between the photoactive layer and the second electrode; and the first barrier layer is not disposed between the second charge transport layer and the second electrode; Preferably, the first charge transport layer comprises a hole transport layer, and the second charge transport layer comprises an electron transport layer.

3. The battery assembly according to claim 1, It is characterized in that The second electrode comprises a metal electrode; Preferably, the second electrode comprises a silver electrode; Preferably, the lead compound comprises lead iodide.

4. The battery assembly according to claim 1, It is characterized in that A second groove is provided between the first battery cell and the second battery cell, the second electrode of the first battery cell and the second electrode of the second battery cell are disconnected at the second groove, and the functional layer of the first battery cell and the functional layer of the second battery cell are disconnected at the second groove; Preferably, the battery assembly further comprises a second barrier layer, wherein the second barrier layer is located in the second groove and covers at least a portion of the side wall of the functional layer; Preferably, at least one of the functional layers comprises a photoactive layer, and the second barrier layer covers the sidewalls of the photoactive layer; Preferably, the second barrier layer and the first barrier layer are made of the same material; Preferably, the orthographic projection of the second groove on the substrate is located within the orthographic projection range of the first electrode of the first battery on the substrate.

5. The battery assembly according to claim 1, It is characterized in that A third groove is provided between the first battery cell and the second battery cell, and the first electrode of the first battery cell and the first electrode of the second battery cell are disconnected at the third groove; Preferably, the orthographic projection of the third groove on the substrate is located on a side of the orthographic projection of the first groove on the substrate away from the first battery unit; Preferably, the orthographic projection of the first groove is located within the orthographic projection range of the first electrode of the first battery on the substrate; Preferably, the first electrode comprises a conductive oxide material; Preferably, the first electrode comprises at least one of fluorine-doped tin dioxide, indium tin oxide, and indium-doped zinc oxide.

6. A method for preparing a battery assembly, It is characterized in that include: Preparing a plurality of first electrodes on a substrate, wherein the plurality of first electrodes include a first battery first electrode and a second battery first electrode; Prepare at least one functional layer on the side of the first electrode facing away from the substrate, at least one of the functional layers comprising a photoactive layer; Patterning at least one of the functional layers to form a first groove, wherein the first groove exposes a portion of the first electrode of the first battery; Applying a free lead solution into the first groove and performing an annealing treatment, wherein the free lead solution reacts with the halogen ions precipitated on the surface of the photoactive layer to form a first barrier layer; Prepare a second electrode layer on a side of the functional layer away from the substrate, wherein the second electrode layer fills the first groove; At least one of the functional layers and the second electrode layer is patterned to form a second groove, wherein the second groove penetrates at least one of the functional layers and the second electrode layer.

7. The preparation method according to claim 6, It is characterized in that The free lead solution includes any one of a lead nitrate solution and a lead acetate solution; and / or, the concentration of the free lead solution is greater than or equal to 0.01 mmol / ml and less than or equal to 0.5 mmol / ml; and / or, the solvent of the free lead solution comprises any one of chlorobenzene, ethanol, toluene, ethyl acetate, and isopropanol; And / or, the temperature of the annealing treatment is 100° C., and the time of the annealing treatment is greater than or equal to 5 min and less than or equal to 30 min.

8. The preparation method according to claim 6, It is characterized in that Applying the free lead solution into the first groove comprises: The free lead solution is coated into the first groove by a slit coating method.

9. The preparation method according to claim 6, It is characterized in that Before applying the free lead solution into the first groove, the method further comprises: Cleaning the first groove with an inert gas; Preferably, patterning at least one of the functional layers to form a first groove comprises: Scribing at least one of the functional layers using a laser scribing process to form the first groove; Preferably, the cleaning of the first groove by using an inert gas comprises: cleaning the laser-scribed debris in the first groove by using a nitrogen gun.

10. The preparation method according to any one of claims 6 to 9, It is characterized in that Also includes: A free lead solution is coated into the second groove and annealed, and the free lead solution reacts with the halogen ions precipitated on the surface of the photoactive layer to form a second barrier layer.

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