Battery assembly and preparation method thereof

Abstract

The invention provides a battery assembly and a preparation method thereof, and solves the problem that the service life of a battery is relatively short in the prior art. The battery assembly comprises a substrate; the plurality of battery units are positioned on one side of the substrate, and each battery unit comprises an optical active layer; a first groove is formed between the adjacent battery units, and the optical active layers of the adjacent battery units are disconnected at the first groove; the first passivation layer is located in the first groove, the first passivation layer covers at least part of the side wall of the optical active layer, and the first passivation layer comprises carbonate.

Description

Technical Field

[0001] The present application relates to the technical field of mobile power sources, and in particular to a battery assembly and a method for preparing the same. Background Art

[0002] Water and oxygen in the air are one of the main factors affecting battery life. Current batteries, such as perovskite batteries, are easily corroded by water and oxygen in the environment during preparation and use, resulting in a decrease in battery life. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a battery assembly and a method for preparing the same, which solves the problem of low battery life 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 photoactive layer; a first groove is provided between adjacent battery cells, the photoactive layers of adjacent battery cells are disconnected at the first groove; and a first passivation layer, located in the first groove, the first passivation layer covers at least a portion of the side wall of the photoactive layer, the first passivation layer comprising a carbonate.

[0005] In combination with the first aspect, in some possible implementations, the battery cell further includes a first electrode and a second electrode, the first electrode being located between the photoactive layer and the substrate, and the second electrode being located on the side of the photoactive layer away from the substrate; the multiple battery cells include adjacent first battery cells and second battery cells, the second battery cell including a second groove, the second electrode of the second battery cell filling the second groove and contacting the first electrode of the first battery cell; preferably, a third groove is also provided between adjacent battery cells, and the first electrodes of adjacent battery cells are disconnected at the third groove; preferably, the battery cell further includes a first charge transfer layer located between the first electrode and the photoactive layer; the first charge transfer layer of the second battery cell fills the third groove; preferably, the orthographic projections of the first groove and the second groove on the substrate are both located within the orthographic projection range of the first electrode of the first battery cell on the substrate.

[0006] In combination with the first aspect, in some possible implementations, the second groove penetrates the photoactive layer of the second battery cell in the thickness direction of the substrate; the battery assembly also includes a second passivation layer, which is located in the second groove, and the second passivation layer is located between the photoactive layer and the second electrode; preferably, the material of the second passivation layer includes carbonate; preferably, the material of the second passivation layer is the same as that of the first passivation layer.

[0007] In combination with the first aspect, in some possible implementations, the battery cell also includes a first charge transport layer located between the first electrode and the photoactive layer; the first charge transport layers of adjacent battery cells are disconnected at the first groove, and the second groove penetrates the first charge transport layer in the thickness direction of the substrate; and / or the battery cell also includes a second charge transport layer located between the photoactive layer and the substrate; the second charge transport layers of adjacent battery cells are disconnected at the first groove, and the second groove penetrates the second charge transport layer in the thickness direction of the substrate; preferably, the first charge transport layer includes a hole transport layer, and the second charge transport layer includes an electron transport layer.

[0008] In combination with the first aspect, in some possible implementations, the photoactive layer includes a perovskite material; preferably, the carbonate includes lead carbonate.

[0009] According to a second aspect of the present application, there is provided 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, a photoactive 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 second groove, the second groove penetrating the photoactive layer, the second electrode of the second battery cell filling the second groove and in contact with the first electrode of the first battery cell; and a second passivation layer located in the second groove and between the photoactive layer and the second electrode, the second passivation layer comprising a carbonate.

[0010] The third 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 the side of the first electrode facing away from the substrate, the functional layer comprising a photoactive layer; patterning at least one of the functional layers to form a second groove, the second groove exposing a portion of the first battery first electrode; preparing a second electrode layer on the side of the functional layer facing away from the substrate, the second electrode layer filling the second groove; patterning the second electrode layer and at least one of the functional layers to form a first groove, the first groove exposing a portion of the first battery first electrode; applying a carbonate solution into the first groove and performing an annealing treatment, the carbonate solution reacting with metal ions precipitated on the surface of the photoactive layer to form a first passivation layer.

[0011] In combination with the third aspect, in some possible implementations, after patterning at least one of the functional layers to form a second groove, it also includes: applying a carbonate solution into the second groove and performing annealing treatment, wherein the carbonate solution reacts with the metal ions precipitated from the surface of the photoactive layer to form a second passivation layer.

[0012] In combination with the third aspect, in some possible implementations, the solvent of the carbonate solution includes any one of chlorobenzene, ethanol, toluene, ethyl acetate, isopropanol, etc.; and / or the concentration of the carbonate solution is 0.01-0.5 mmol / ml; and / or the carbonate solution includes a weak alkaline carbonate solution; preferably, the carbonate solution includes sodium carbonate or potassium carbonate; and / or the annealing treatment includes: annealing at 100°C for 5-30 min; and / or the metal ions include lead ions.

[0013] In a fourth aspect, 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 away from the substrate, the functional layer comprising a photoactive layer; patterning at least one of the functional layers to form a second groove, the second groove exposing a portion of the first battery first electrode; applying a carbonate solution into the second groove and performing an annealing treatment, the carbonate solution reacting with metal ions precipitated on the surface of the photoactive layer to form a second passivation layer; preparing a second electrode layer on a side of the functional layer away from the substrate, the second electrode layer filling the second groove; patterning the second electrode layer and at least one of the functional layers to form a first groove, the first groove exposing a portion of the first battery first electrode, the orthographic projection of the first groove on the substrate being located on a side of the orthographic projection of the second groove on the substrate away from the orthographic projection of the second battery first electrode on the substrate.

[0014] According to the display panel and its preparation method provided by the embodiment of the present application, the battery assembly includes: a substrate; a plurality of battery cells, located on one side of the substrate, the battery cells including a photoactive layer; a first groove is opened between adjacent battery cells, and the photoactive layers of adjacent battery cells are disconnected at the first groove; and a first passivation layer, located in the first groove, the first passivation layer covers at least part of the side wall of the photoactive layer, and the first passivation layer includes carbonate. By covering the surface of the perovskite layer exposed in the groove with the passivation layer, the passivation layer is used to block water and oxygen in the environment, thereby improving the device life. 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 structural diagram of a battery assembly provided in the third embodiment of the present application.

[0018] Figure 4 A schematic diagram of a process for preparing a battery assembly according to an embodiment of the present application.

[0019] Figure 5a-5g For execution Figure 4 Schematic diagram of the structure of the intermediate product formed during the preparation method shown. DETAILED DESCRIPTION

[0020] 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%.

[0021] As mentioned in the background technology, 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 component as an example, the perovskite battery component needs to be scratched to form grooves during preparation. During the scratching process, the laser generates a lot of heat, and the exposed perovskite layer in the groove will react with water and oxygen in the air at high temperature, causing some perovskites to decompose and fail, affecting the long-term operation stability of the device.

[0022] In view of this, an embodiment of the present application provides a battery component and a method for preparing the same, by covering the surface of the perovskite layer exposed in the groove with a passivation layer, and using the passivation layer to block water and oxygen in the environment, thereby improving the device life.

[0023] 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.

[0024] 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.

[0025] 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 intermediate structures interposed therebetween.

[0026] 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 1 As shown, the battery assembly includes: a substrate 10, a plurality of battery cells 20 and a first passivation layer 31. The plurality of battery cells 20 are all located on one side of the substrate 10, and the battery cells 20 include a photoactive layer 21. A first groove H1 is provided between adjacent battery cells 20, and the photoactive layers 21 of adjacent battery cells 20 are disconnected at the first groove H1. The first passivation layer 31 is located in the first groove H1, and the first passivation layer 31 covers at least part of the sidewall of the photoactive layer 21, and the first passivation layer 31 includes carbonate.

[0027] 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.

[0028] The material of the photoactive layer 21 includes any one of perovskite, antimony selenide, and organic photovoltaic materials.

[0029] The first passivation layer 31 is used to block water and oxygen in the environment, thereby providing protection for the exposed photoactive layer 21 in the first groove H1. In one embodiment, the photoactive layer 21 includes a perovskite layer, and the carbonate includes lead carbonate.

[0030] like Figure 1 As shown, the battery cell 20 further includes a first electrode 22 and a second electrode 23. The first electrode 22 is located between the photoactive layer 21 and the substrate 10, and the second electrode 23 is located on the side of the photoactive layer 21 away from the substrate 10.

[0031] Exemplarily, the first electrode 22 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 includes at least one of indium tin oxide (ITO), fluorine-doped tin oxide (FTO) and indium-doped zinc oxide (IZO).

[0032] Exemplarily, the second electrode 23 includes a metal electrode. Exemplarily, the second electrode 23 is a transparent electrode. For example, the second electrode 23 is a silver electrode.

[0033] like Figure 1 As shown, a plurality of battery cells 20 are connected in series. Specifically, the plurality of battery cells 20 include adjacent first battery cells 210 and second battery cells 220. The second battery cell 220 includes a second groove H2, and the second electrode 23 of the second battery cell 220 fills the second groove H2 and contacts the first electrode 21 of the first battery cell 210.

[0034] Exemplarily, the second groove H2 penetrates the photoactive layer 21 of the second battery unit 220 .

[0035] Exemplarily, the battery cell 20 further includes a first charge transport layer 24 and a second charge transport layer 25, wherein the first charge transport layer 24 is located between the first electrode 22 and the photoactive layer 21, and the second charge transport layer 25 is located between the second electrode 23 and the photoactive layer 21. The first charge transport layer 24 of adjacent battery cells 20 is disconnected at the first groove H1, and the second charge transport layer 25 of adjacent battery cells 20 is disconnected at the first groove H1. The second groove H2 sequentially penetrates the second charge transport layer 25, the photoactive layer 21 and the first charge transport layer 24 in the thickness direction of the substrate 10. The first charge transport layer 24 may be a hole transport layer, and the second charge transport layer 25 may be an electron transport layer.

[0036] It should be noted that, in actual products, the first charge transport layer 24 and the second charge transport layer 25 can exist independently, that is, the battery cell 20 only includes the first charge transport layer 24 but not the second charge transport layer 25; or only includes the second charge transport layer 25 but not the first charge transport layer 24.

[0037] like Figure 1 As shown, a third groove H3 is also provided between adjacent battery cells 20, and the first electrodes 22 of adjacent battery cells 20 are disconnected at the third groove H3. The first charge transfer layer 24 of the second battery cell 220 fills the third groove H3. In the thickness direction of the substrate 10, the third groove H3 and the first groove H1 are arranged in a staggered manner. The orthographic projection of the third groove H3 on the substrate 10 and the orthographic projection of the first groove H1 on the substrate 10 do not overlap.

[0038] The orthographic projections of the first groove H1 and the second groove H2 on the substrate 10 are both located within the orthographic projection range of the first electrode 22 of the first battery cell 210 on the substrate 10. Specifically, along the arrangement direction of the first battery cell 210 and the second battery cell 220, the orthographic projection of the first groove H1 on the substrate 10, the orthographic projection of the second groove H2 on the substrate 10, and the orthographic projection of the third groove H3 on the substrate 10 are arranged in sequence. Part of the first electrode 22 of the first battery cell 210 is located between the first charge transfer layer 24 of the second battery cell 220 and the substrate 10.

[0039] According to the battery assembly provided in this embodiment, by covering the surface of the photoactive layer 21 exposed in the first groove H1 with the first passivation layer 31, the water and oxygen barrier properties of the first passivation layer 31 are used to provide protection for the photoactive layer 21, thereby improving the long-term operation stability of the battery and further improving the service life of the battery assembly.

[0040] 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 passivation layer 32. The second passivation layer 32 is located in the second groove H2, and the second passivation layer 32 is located between the photoactive layer 21 and the second electrode 23.

[0041] The photoactive layer 21 in the second groove H2 of the product is not directly exposed to the environment, but during the preparation of the battery assembly, the photoactive layer 21 in the second groove H2 has a chance to contact with water and oxygen in the environment. Therefore, by setting the second passivation layer 32, the exposed photoactive layer 21 in the second groove H2 can be protected.

[0042] In one embodiment, the second passivation layer 32 and the first passivation layer 31 are made of the same material, that is, the second passivation layer 32 includes carbonate.

[0043] It should be noted that the relevant technical details of the second passivation layer 32 can be found in Figure 1 The relevant technical description of the first passivation layer 31 in the illustrated embodiment will not be described in detail here.

[0044] Figure 3 This is a schematic diagram of the structure of a battery assembly provided in the third embodiment of the present application. Figure 3 The battery components and Figure 1 , Figure 2 The difference between the battery assembly shown is that, in this embodiment, the second passivation layer 32 is provided, and the first passivation layer 31 is not provided.

[0045] Specifically, the battery assembly includes: a substrate 10, a plurality of battery cells 20 and a second passivation layer 32. Among them, the plurality of battery cells 20 are all located on one side of the substrate 10, and the battery cell 20 includes a first electrode 22, a photoactive layer 21 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 second groove H2, and the second groove H2 penetrates the photoactive layer 21. The second electrode 23 of the second battery cell 220 fills the second groove H2 and contacts the first electrode 22 of the first battery cell 210. The second passivation layer 32 is located in the second groove H2 and between the photoactive layer 21 and the second electrode 23. The second passivation layer 32 includes a carbonate.

[0046] The battery assembly provided according to this embodiment and the battery assembly provided in any of the above embodiments belong 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.

[0047] The present application also provides a method for preparing a battery assembly, which is suitable for preparing the battery assembly provided in any of the above embodiments. Figure 4 A schematic diagram of a process for preparing a battery assembly according to an embodiment of the present application. Figure 4 As shown, the preparation method comprises:

[0048] Step S410, preparing a plurality of first electrodes on a substrate. The plurality of first electrodes include a first battery first electrode and a second battery first electrode.

[0049] Step S420: preparing at least one functional layer on the side of the first electrode facing away from the substrate, wherein the functional layer includes a photoactive layer.

[0050] Step S430: patterning at least one functional layer to form a second groove, wherein the second groove exposes a portion of the first electrode of the first battery.

[0051] In one embodiment, after executing step S430, the preparation method further includes: applying a carbonate solution into the second groove and performing an annealing treatment, wherein the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a second passivation layer. The second passivation layer is only formed in the second groove and does not cover the side of the functional layer away from the substrate, so it does not affect the conductivity of the second electrode prepared subsequently.

[0052] Step S440: preparing a second electrode layer on the side of the functional layer facing away from the substrate, and the second electrode layer fills the second groove.

[0053] Step S450, patterning the second electrode layer and at least one functional layer to form a first groove to obtain a plurality of second electrodes. The first groove exposes a portion of the first electrode of the first battery.

[0054] Step S460: coating a carbonate solution into the first groove and performing an annealing treatment, wherein the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a first passivation layer.

[0055] It should be noted that, in other embodiments, the step of preparing the first passivation layer can be omitted to obtain Figure 3 Battery assembly shown.

[0056] Figure 5a-5g For execution Figure 4 The schematic diagram of the structure of the intermediate product formed during the preparation method shown in FIG. Figure 5a-5g The execution process of the preparation method is described in detail.

[0057] According to step S410, refer to Figure 5a , a plurality of first electrodes 22 are prepared on the substrate 10. The plurality of first electrodes 22 include a first battery first electrode 221 and a second battery first electrode 222.

[0058] 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).

[0059] 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.

[0060] Next, the conductive layer is scribed by laser to form a third groove H3 . The third groove H3 divides the conductive layer into two parts, namely, the first battery first electrode 221 and the second battery first electrode 222 .

[0061] It should be understood that the number of the third grooves H3 formed in this step determines the number of the first electrodes 22, and further determines the number of battery cells 20 formed subsequently. The third grooves H3 can be reasonably selected according to actual needs.

[0062] 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.

[0063] According to step S420, refer to Figure 5b At least one functional layer is prepared on the side of the first electrode 22 facing away from the substrate 10 , and the functional layer includes a photoactive layer 21 .

[0064] Exemplarily, the functional layer further includes a first charge transport layer 24 and a second charge transport layer 25 , and in a direction away from the substrate 10 , the first charge transport layer 24 , the photoactive layer 21 and the second charge transport layer 25 are stacked in sequence.

[0065] Taking the example that at least one functional layer includes a first charge transport layer 24, a photoactive layer 21, and a second charge transport layer 25 stacked in sequence, step S420 specifically includes:

[0066] First, a first charge transport material is plated on the side of the first electrode 22 facing away from the substrate 10 by a magnetron sputtering process to form a first charge transport layer 24 .

[0067] 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.

[0068] Exemplarily, the thickness of the first charge transport layer 24 is greater than or equal to 5 nanometers and less than or equal to 30 nm. For example, the thickness of the first charge transport layer 24 is 10 nm, 15 nm, 20 nm, 25 nm, etc.

[0069] 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.

[0070] 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.

[0071] Next, a perovskite precursor solution is coated on the first charge transport layer 24. Exemplarily, the perovskite precursor solution contains at least two of formamidinium lead iodine (FAI), methylamine lead iodine (MAI), cesium iodide (CsI), and lead iodide (PbI2), of which PbI2 must be included.

[0072] 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.

[0073] Then, an annealing treatment is performed on a hot stage. 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 a three-dimensional perovskite photoactive layer 21 .

[0074] Finally, a thermal evaporation process is used to sequentially evaporate C60 and an electron transport material on the upper surface of the photoactive layer 21 to form a second charge transport layer 25 .

[0075] Exemplarily, the electron transport material is BCP, and its chemical formula is, for example, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline.

[0076] 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.

[0077] 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.

[0078] According to step S430, refer to Figure 5c , at least one functional layer is patterned to form a second groove H2.

[0079] For example, at least one functional layer is laser scribed to form a second groove H2. The second groove H2 sequentially penetrates the first charge transport layer 24, the photoactive layer 21 and the second charge transport layer 25 in the thickness direction of the substrate 10, and the second groove H2 exposes a portion of the first battery first electrode 221.

[0080] According to step S440, refer to Figure 5d , a second electrode layer is prepared on the side of the functional layer facing away from the substrate 10. The second electrode layer fills the second groove H2 and contacts the first electrode 221 of the first battery.

[0081] For example, a thermal evaporation process is used to evaporate metal Ag on the side of the functional layer facing away from the substrate 10 to form the second electrode layer. Exemplarily, the thickness of the second electrode layer is 100 nm.

[0082] See also Figure 5e , a carbonate solution is coated into the second groove H2 and an annealing treatment is performed, and the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a first passivation layer 31 .

[0083] Exemplarily, the metal ion includes lead ion. In this case, the reaction formula of carbonate solution and metal ion is: Accordingly, the second passivation layer 32 includes lead carbonate.

[0084] Exemplarily, the carbonate solution is a weakly alkaline carbonate solution, for example, sodium carbonate, potassium carbonate, and the like.

[0085] Illustratively, the concentration of the carbonate solution is greater than or equal to 0.01 mmol / ml and less than or equal to 0.5 mmol / ml.

[0086] Exemplarily, the solvent of the carbonate solution is one of chlorobenzene, ethanol, toluene, ethyl acetate, isopropanol, and the like.

[0087] Exemplarily, 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.

[0088] According to step S450, refer to Figure 5f The second electrode layer and at least one functional layer are patterned to form a first groove H1. The first groove H1 divides the second electrode layer into a plurality of second electrodes 23 that are independent of each other.

[0089] For example, the second electrode layer and at least one functional layer are laser scribed to form a first groove H1. The first groove H1 sequentially penetrates the second charge transport layer 25, the photoactive layer 21 and the first charge transport layer 24 in the thickness direction of the substrate 10, and exposes a portion of the first battery first electrode 221. The orthographic projection of the first groove H1 on the substrate 10 is located on the side of the orthographic projection of the second groove H2 on the substrate 10 away from the orthographic projection of the second battery first electrode 222 on the substrate 10.

[0090] At this point, two battery cells connected in series are formed, namely the first battery cell 210 and the second battery cell 220. The first battery cell 210 and the second battery cell 220 are independent of each other through the first groove H1 and the third groove H3. The second electrode 23 of the second battery cell 220 contacts the first electrode 22 of the first battery cell 210 through the second groove H2, so that the first battery cell 210 and the second battery cell 220 are connected in series.

[0091] According to step S460, refer to Figure 5g, a carbonate solution is coated into the first groove H1 and an annealing treatment is performed, and the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a first passivation layer 31 .

[0092] It should be noted that the preparation process parameters of the first passivation layer 31 may refer to the preparation process of the second passivation layer 32 , which will not be described in detail here.

[0093] 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.

[0094] 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, characterized in that: include: substrate; A plurality of battery cells are located on one side of the substrate, the battery cells comprising a photoactive layer; a first groove is provided between adjacent battery cells, and the photoactive layers of adjacent battery cells are disconnected at the first groove; as well as The first passivation layer is located in the first groove, the first passivation layer covers at least a portion of the side wall of the photoactive layer, and the first passivation layer includes carbonate.

2. The battery assembly according to claim 1, characterized in that: The battery cell further comprises a first electrode and a second electrode, the first electrode being located between the photoactive layer and the substrate, and the second electrode being located on a side of the photoactive layer away from the substrate; the plurality of battery cells comprises adjacent first battery cells and second battery cells, the second battery cell comprising a second groove, the second electrode of the second battery cell filling the second groove and contacting the first electrode of the first battery cell; Preferably, a third groove is further provided between adjacent battery cells, and the first electrodes of adjacent battery cells are disconnected at the third groove; Preferably, the battery cell further comprises a first charge transport layer located between the first electrode and the photoactive layer; the first charge transport layer of the second battery cell fills the third groove; Preferably, the orthographic projections of the first groove and the second groove on the substrate are both located within the orthographic projection range of the first electrode of the first battery unit on the substrate.

3. The battery assembly according to claim 2, characterized in that: The second groove penetrates the photoactive layer of the second battery unit in the thickness direction of the substrate; the battery assembly further comprises a second passivation layer located in the second groove, and the second passivation layer is located between the photoactive layer and the second electrode; Preferably, the material of the second passivation layer includes carbonate; Preferably, the second passivation layer and the first passivation layer are made of the same material.

4. The battery assembly according to claim 2 or 3, characterized in that: The battery cell further includes a first charge transport layer located between the first electrode and the photoactive layer; the first charge transport layers of adjacent battery cells are disconnected at the first groove, and the second groove penetrates the first charge transport layer in the thickness direction of the substrate; and / or The battery cell further includes a second charge transport layer located between the photoactive layer and the substrate; the second charge transport layers of adjacent battery cells are disconnected at the first groove, and the second groove penetrates the second charge transport layer in the thickness direction of the substrate; Preferably, the first charge transport layer comprises a hole transport layer, and the second charge transport layer comprises an electron transport layer.

5. The battery assembly according to claim 1, characterized in that: The photoactive layer includes a perovskite material and the carbonate includes lead carbonate.

6. A battery assembly, 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, a photoactive layer, and a second electrode stacked in a direction away from the substrate; the plurality of battery cells include a first battery cell and a second battery cell, the second battery cell includes a second groove, the second groove penetrates the photoactive layer, the second electrode of the second battery cell fills the second groove and contacts the first electrode of the first battery cell; as well as The second passivation layer is located in the second groove and between the photoactive layer and the second electrode, and the second passivation layer includes carbonate.

7. A method for preparing a battery assembly, 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; At least one functional layer is prepared on a side of the first electrode facing away from the substrate, wherein the functional layer comprises a photoactive layer; Patterning at least one of the functional layers to form a second groove, wherein the second groove exposes a portion of the first electrode of the first battery; Prepare a second electrode layer on a side of the functional layer away from the substrate, wherein the second electrode layer fills the second groove; Performing patterning on the second electrode layer and 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; A carbonate solution is coated into the first groove and annealing treatment is performed, and the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a first passivation layer.

8. The preparation method according to claim 7, characterized in that: After patterning at least one of the functional layers to form a second groove, the method further comprises: A carbonate solution is coated into the second groove and an annealing treatment is performed, wherein the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a second passivation layer.

9. The preparation method according to claim 7 or 8, characterized in that: The solvent of the carbonate solution includes any one of chlorobenzene, ethanol, toluene, ethyl acetate, isopropanol, etc.; and / or, the concentration of the carbonate solution is 0.01 to 0.5 mmol / ml; And / or, the carbonate solution comprises a weakly alkaline carbonate solution; Preferably, the carbonate solution comprises sodium carbonate or potassium carbonate; And / or, the annealing treatment includes: annealing at 100° C. for 5 to 30 minutes; And / or, the metal ions include lead ions.

10. A method for preparing a battery assembly, 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; At least one functional layer is prepared on a side of the first electrode facing away from the substrate, wherein the functional layer comprises a photoactive layer; Patterning at least one of the functional layers to form a second groove, wherein the second groove exposes a portion of the first electrode of the first battery; Applying a carbonate solution into the second groove and performing an annealing treatment, wherein the carbonate solution reacts with metal ions precipitated on the surface of the photoactive layer to form a second passivation layer; Prepare a second electrode layer on a side of the functional layer away from the substrate, wherein the second electrode layer fills the second groove; The second electrode layer and at least one of the functional layers are patterned to form a first groove, wherein the first groove exposes a portion of the first battery first electrode, and the orthographic projection of the first groove on the substrate is located on a side of the orthographic projection of the second groove on the substrate away from the orthographic projection of the second battery first electrode on the substrate.

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