Method for manufacturing all-solid-state battery assembly and all-solid-state battery assembly

Abstract

The application discloses a preparation method of a full-solid-state battery assembly and the full-solid-state battery assembly, and belongs to the technical field of secondary batteries. The preparation method of the full-solid-state battery assembly comprises the following steps: providing a first temporary substrate, sequentially depositing a positive electrode material layer, a solid-state electrolyte layer, a negative electrode material layer and a negative electrode current collector on the surface of the first temporary substrate in a deposition mode; preparing a second temporary substrate on the surface of the negative electrode current collector away from the negative electrode material layer; peeling the first temporary substrate from the positive electrode material layer; depositing a positive electrode current collector on the surface of the positive electrode material layer away from the solid-state electrolyte layer with the second temporary substrate as a deposition substrate to obtain a first full-solid-state battery; preparing a second full-solid-state battery on the first full-solid-state battery with the second temporary substrate as the deposition substrate; and repeatedly performing the above steps for multiple times, peeling the second temporary substrate, and obtaining the full-solid-state battery assembly. The preparation process can be simplified, and the equipment cost can be reduced.

Description

Technical Field

[0001] This application belongs to the field of secondary battery technology, specifically relating to a method for preparing an all-solid-state battery module and the all-solid-state battery module. Background Technology

[0002] Rechargeable batteries, also known as secondary batteries, are widely used in various electronic devices as "energy storage-power supply" equipment. Currently, most commercially available secondary batteries use liquid organic materials as electrolytes. However, improving energy density presents several challenges: instability in the bulk and surface structures during high-voltage charging, leading to oxygen evolution and electrolyte oxidation; interface instability and generally poor rate performance; slow ion transport within particles, between particles, within electrodes, in the electrolyte phase, at various interfaces, and within the cell at high current densities; and a high probability of thermal runaway, resulting in frequent safety incidents.

[0003] In recent years, all-solid-state rechargeable batteries have attracted continuous attention from academia and industry. All-solid-state rechargeable batteries use solid electrolytes instead of liquid electrolytes, solving safety issues such as stability, leakage, and flammability / explosion. For example, in all-solid-state lithium batteries, the solid electrolyte not only conducts lithium ions but also acts as a separator. Lithium ions are inserted and extracted between the positive and negative electrodes through the solid electrolyte, exchanging charge with electrons to achieve the conversion of electrical energy into chemical energy. Compared to currently commercialized liquid lithium batteries, all-solid-state lithium batteries have higher safety, energy density, and specific capacity, making them a highly promising lithium battery system.

[0004] The discharge voltage plateau of a single all-solid-state battery device is affected by the material system used. Therefore, it is necessary to connect them in series and parallel to fabricate a battery module. In other words, the required voltage and capacity can be obtained by fabricating an all-solid-state battery module. However, traditional methods for fabricating all-solid-state battery modules involve numerous technical routes, require various equipment, involve large equipment investments, and still need improvement. Summary of the Invention

[0005] In view of the above-mentioned problems, the present invention aims to at least partially solve one of the technical problems in the related art. Therefore, the present invention provides a method for preparing an all-solid-state battery module and an all-solid-state battery module, which can alleviate the problems of complex manufacturing processes, high costs, or large equipment investments in current all-solid-state battery module preparation methods, and is conducive to achieving large-scale production.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] As one aspect of this application, a method for fabricating an all-solid-state battery module is provided, the method comprising:

[0008] A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially deposited on the surface of the first temporary substrate by deposition.

[0009] A second temporary substrate is prepared on the surface of the negative electrode current collector that is away from the negative electrode material layer;

[0010] The first temporary substrate is peeled off from the positive electrode material layer, and the second temporary substrate is used as the deposition substrate to deposit a positive electrode current collector on the surface of the positive electrode material layer away from the solid electrolyte layer, thereby obtaining a first all-solid-state battery.

[0011] Multiple all-solid-state batteries are sequentially formed on the side of the first all-solid-state battery that is away from the second temporary substrate;

[0012] The second temporary substrate and the first all-solid-state cell are peeled off to obtain an all-solid-state cell assembly containing multiple electrically connected all-solid-state cells.

[0013] As another aspect of this application, a method for fabricating an all-solid-state battery module is provided, the method comprising:

[0014] A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially deposited on the surface of the first temporary substrate by deposition.

[0015] N-1 all-solid-state batteries are sequentially formed on the side of the negative electrode current collector that is away from the negative electrode material layer, where N≥3;

[0016] A second temporary substrate is formed on the side of the Nth all-solid-state battery that is away from the first temporary substrate;

[0017] The first temporary substrate is peeled off from the positive electrode material layer;

[0018] Using a second temporary substrate as a substrate, a positive current collector is generated on the positive electrode material layer, and a positive current collector is generated on the side of the positive electrode material layer away from the second temporary substrate to form a first all-solid-state battery.

[0019] The second temporary substrate and the Nth all-solid-state cell are peeled off to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state cells.

[0020] As another aspect of this application, a method for fabricating an all-solid-state battery module is provided, the method comprising:

[0021] A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, and a negative electrode material layer are sequentially deposited on the surface of the first temporary substrate by deposition.

[0022] The first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer and a negative electrode material layer; or, the first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer and a negative electrode layer, and the intermediate is cut to obtain a monolithic structure.

[0023] By simultaneously depositing positive electrode current collectors and negative electrode current collectors on both sides of the intermediate or monolithic structure, a first all-solid-state battery is obtained.

[0024] Using the first all-solid-state battery as a deposition substrate, a second all-solid-state battery is formed on the first all-solid-state battery;

[0025] The above steps are repeated or performed in parallel multiple times, and a cutting process is performed to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries; or, the above steps are repeated or performed in parallel multiple times to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries.

[0026] As another aspect of this application, a method for fabricating an all-solid-state battery module is provided, the method comprising:

[0027] A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially deposited on the surface of the first temporary substrate by deposition.

[0028] The first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector; or, the first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector, and the intermediate is cut to obtain a monolithic structure.

[0029] A positive electrode current collector is deposited on the surface of the positive electrode material layer in the intermediate or the monolithic structure on the side opposite to the solid electrolyte layer to obtain a first all-solid-state battery.

[0030] Using the first all-solid-state battery as a deposition substrate, a second all-solid-state battery is formed on the first all-solid-state battery;

[0031] The above steps are repeated or performed in parallel multiple times, and a cutting process is performed to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries; or, the above steps are repeated or performed in parallel multiple times to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries.

[0032] In addition, in some embodiments, the deposition is performed in a vacuum environment.

[0033] In addition, in some embodiments, the deposition includes physical vapor deposition, which includes at least one of vacuum evaporation, magnetron sputtering, arc plasma deposition, ion beam or molecular beam epitaxy.

[0034] In addition, in some embodiments, the positive electrode material layer, solid electrolyte layer, negative electrode material layer, negative electrode current collector and positive electrode current collector are generated in different process chambers, which are physical vapor deposition vacuum coating chambers.

[0035] In addition, in some embodiments, the positive electrode material layer, the solid electrolyte layer, and the negative electrode material layer are generated in different process chambers, while the negative electrode current collector and the positive electrode current collector are generated in the same process chamber, which is a physical vapor deposition vacuum coating chamber.

[0036] In some embodiments, the positive electrode material layer, solid electrolyte layer, negative electrode material layer, and negative electrode current collector are grown by winding or by coating a substrate.

[0037] In addition, in some embodiments, the first temporary substrate or the second temporary substrate includes at least one of PET film, PP film, PI film or metal foil, silicon substrate, and glass substrate.

[0038] In addition, in some embodiments, the stripping method includes at least one of plasma treatment, laser treatment, heat treatment or chemical treatment;

[0039] Alternatively, the provision of the first temporary substrate may be a provision of a first temporary substrate with a transition layer, wherein a positive electrode material layer is deposited on the transition layer of the first temporary substrate, and then the first temporary substrate is peeled off by a physical or chemical peeling method.

[0040] As another aspect of this application, an all-solid-state battery module is also provided, which is prepared by the aforementioned method for preparing an all-solid-state battery module.

[0041] Implementing the technical solution of the present invention has at least the following beneficial effects:

[0042] In the fabrication of this all-solid-state battery module, each functional layer, such as the positive electrode material layer, solid electrolyte layer, negative electrode material layer, negative electrode current collector, and positive electrode current collector, can be prepared by deposition, such as by physical vapor deposition. Furthermore, a first temporary substrate or a first temporary substrate and a second temporary substrate are set up during the fabrication process to allow for subsequent repetition of the solid electrolyte battery fabrication process. This greatly simplifies the fabrication process, streamlines the manufacturing flow, and improves production efficiency. Moreover, this method reduces the use of different equipment, lowering manufacturing costs. Simultaneously, using deposition to prepare the aforementioned functional layers reduces the interfacial impedance between the negative or positive electrode and the solid electrolyte film, ensuring the electrochemical performance of the all-solid-state battery. This method is suitable for large-scale fabrication of all-solid-state batteries under constrained conditions, meaning it is easy to achieve mass production.

[0043] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0044] Figure 1 This is a schematic flowchart of the preparation method of the all-solid-state battery module provided in Embodiment 1 of the present invention;

[0045] Figure 2 This is another schematic diagram of the process for preparing an all-solid-state battery module provided in Embodiment 1 of the present invention;

[0046] Figure 3 This is a schematic flowchart of the preparation method of the all-solid-state battery module provided in Embodiment 2 of the present invention;

[0047] Figure 4 This is a schematic flowchart of the preparation method of the all-solid-state battery module provided in Embodiment 3 of the present invention;

[0048] Figure 5 This is a schematic flowchart of the preparation method of the all-solid-state battery module provided in Embodiment 4 of the present invention. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] In related technologies, there are numerous technical routes for the fabrication of all-solid-state battery modules, requiring the use of various equipment during the fabrication process, resulting in large equipment investments and high costs, which still require further improvement. In view of this, the technical solution of this application provides a method for fabricating all-solid-state battery modules and an all-solid-state battery module. The technical solution of this application helps to reduce the mixing of different equipment, simplifies the fabrication process, reduces manufacturing costs, and also ensures the electrochemical performance of the battery module. A detailed description of the technical solution is provided below.

[0051] Example 1

[0052] Please see Figures 1 to 2 As shown, in some embodiments, a method for fabricating an all-solid-state battery module is provided, including the following steps:

[0053] S100, Provide a first temporary substrate, and deposit a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector sequentially on the surface of the first temporary substrate by deposition.

[0054] S200, a second temporary substrate is prepared on the side surface of the negative electrode current collector that is away from the negative electrode material layer.

[0055] S300: The first temporary substrate is peeled off from the positive electrode material layer, and the second temporary substrate is used as the deposition substrate to deposit a positive electrode current collector on the surface of the positive electrode material layer away from the solid electrolyte layer, thereby obtaining a first all-solid-state battery.

[0056] S400. Using the second temporary substrate as a deposition substrate, a second all-solid-state battery is deposited on the positive current collector in the first all-solid-state battery to obtain a second all-solid-state battery that is electrically connected to the first all-solid-state battery.

[0057] S500, On the side of the second all-solid-state battery away from the second temporary substrate, a third all-solid-state battery is formed on the second all-solid-state battery to obtain a third all-solid-state battery electrically connected to the second all-solid-state battery.

[0058] S600. Repeat or parallelize the above steps multiple times to obtain multiple electrically connected all-solid-state batteries. Then, peel the second temporary substrate from the first all-solid-state battery to obtain an all-solid-state battery module.

[0059] It should be noted that in steps S400 and S500, both the second and third all-solid-state batteries include a positive electrode current collector, a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector, without further limitations. Optionally, adjacent all-solid-state batteries may also share a single current collector to simplify the process and battery structure.

[0060] In step S600, repeating or paralleling the above steps multiple times refers to repeatedly performing the fabrication process of a single all-solid-state battery, that is, repeatedly preparing the positive electrode current collector, positive electrode material layer, solid electrolyte layer, negative electrode material layer and negative electrode current collector, or the negative electrode current collector, negative electrode material layer, solid electrolyte layer, positive electrode material layer and positive electrode current collector; for example, continuing to prepare a fourth all-solid-state battery on the third all-solid-state battery, and then preparing a fifth all-solid-state battery on the fourth all-solid-state battery, and so on, until the Nth all-solid-state battery is prepared. In this embodiment, the number of all-solid-state batteries is not limited, such as N can be ≥3.

[0061] The method for fabricating an all-solid-state battery module provided in this invention involves setting up a first temporary substrate and a second temporary substrate during the fabrication process. Other functional layers, such as a solid electrolyte layer, a negative electrode material layer, a negative electrode current collector, and a positive electrode current collector, are then deposited on the positive electrode material layer. This reduces the need for additional substrates or base materials, eliminating the need for cumbersome steps involving their removal. This significantly simplifies the fabrication process, makes it easier to operate, streamlines the manufacturing process, and improves production efficiency.

[0062] The method for fabricating an all-solid-state battery module provided in this invention allows for the deposition of all functional layers, such as the positive electrode material layer, solid electrolyte layer, negative electrode material layer, negative electrode current collector, and positive electrode current collector, using physical vapor deposition (PVD). This means the entire process can utilize PVD deposition. Compared to existing dry or wet methods for fabricating all-solid-state batteries, the method provided in this invention utilizes PVD deposition throughout the entire process. Under vacuum conditions, a dense and uniform deposition layer is rapidly formed on the substrate surface, offering safety, high efficiency, good interface stability, and suitability for large-scale production. Furthermore, the PVD method for fabricating each functional layer reduces the need for mixing different equipment, lowering manufacturing costs. Simultaneously, the use of independent chamber stacking for PVD fabrication of the all-solid-state battery allows for dynamic adjustment of the thickness and atomic ratio of each functional layer to achieve optimal results. In addition, the deposition method for preparing the above-mentioned functional layers is not only simple and easy to control with fewer types of equipment, but also reduces the interfacial impedance between the negative or positive electrode and the solid electrolyte film, which can ensure the electrochemical performance of the all-solid-state battery. Therefore, the method of the present invention is suitable for large-scale preparation of all-solid-state battery modules under limited conditions, that is, it is easy to achieve mass production.

[0063] The method provided in this invention is suitable for application in the field of secondary batteries, especially solid-state batteries, and can be applied to the preparation of various all-solid-state batteries, such as all-solid-state lithium battery modules. The following mainly uses the preparation of all-solid-state lithium battery modules as an example to describe the method of this invention in detail. However, those skilled in the art will understand that the method of this invention is not limited to all-solid-state lithium battery modules, but is suitable for application in various solid-state batteries such as all-solid-state sodium battery modules.

[0064] Optionally, both the first and second temporary substrates can be made of flexible material layers. Furthermore, the temporary substrate is a separable flexible material temporary substrate. Alternatively, in other cases, the first or second temporary substrate can be a non-flexible temporary substrate. The subsequent peeling method will differ depending on the material or type of temporary substrate used.

[0065] Optionally, the first temporary substrate is a temporary substrate with a first area, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector are sequentially grown on the surface of the first temporary substrate by means of winding.

[0066] In this embodiment, the first temporary substrate is a temporary substrate with a first area, that is, the area of ​​the first temporary substrate is relatively large (for example, its length and width are not less than 20cm respectively). When the first temporary substrate is flexible, the positive electrode material layer, the solid electrolyte layer, the negative electrode material layer and the negative electrode current collector can be grown sequentially on the surface of the first temporary substrate by winding. Then, the second temporary substrate is prepared on the negative electrode current collector. The first temporary substrate is then peeled off, and the positive electrode current collector is formed on the positive electrode material layer. Then, the preparation work of fixing the electrolyte battery is repeated to form multiple stacked solid electrolyte batteries. Then, the second temporary substrate is peeled off, and then it is cut and packaged to obtain an all-solid-state battery module.

[0067] Therefore, the fabrication process of forming functional layers such as positive electrode material layer, solid electrolyte layer, negative electrode material layer, and negative electrode current collector layer by winding has high production capacity and high efficiency.

[0068] Furthermore, when the first temporary substrate has a first area, i.e., a relatively large first area (e.g., larger than the area of ​​at least two monolithic all-solid-state electrolyte batteries), and the first temporary substrate is non-flexible, it can be loaded onto a coating carrier plate by a loading mechanism and transferred to the process chamber. A positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially grown on the surface of the first temporary substrate. Then, a second temporary substrate is prepared on the negative electrode current collector. The first temporary substrate is then peeled off, and a positive electrode current collector is formed on the positive electrode material layer. The preparation of the fixed electrolyte battery is then repeated to form multiple stacked solid electrolyte batteries. The second temporary substrate is then peeled off, and the batteries are then cut and packaged to obtain multiple all-solid-state battery modules. For example, when the first temporary substrate is a non-flexible material, and the first area is the area of ​​two monolithic all-solid-state electrolyte batteries, multiple stacked solid electrolyte batteries are formed. The second temporary substrate is then peeled off, and the batteries are cut and packaged to obtain two all-solid-state battery modules.

[0069] Optionally, the peeling and cutting processes in the above scheme can also be adjusted. For example, when the first temporary substrate has an area larger than that of multiple single-cell all-solid-state electrolyte batteries, a cutting process is required. The substrate can be first cut into multiple all-solid-state battery modules, and then the second temporary substrate can be peeled off. In this process, laser cutting can be performed from the second temporary substrate side. Due to the presence of the second temporary substrate, the cutting process is protected from damage to the all-solid-state electrolyte batteries. Of course, the cutting process can also be adjusted according to process requirements. For example, cutting can be performed in the corresponding process steps before forming the first solid-state electrolyte battery, or after forming the first solid-state electrolyte battery, or after forming multiple stacked solid-state electrolyte batteries, followed by cutting and encapsulation to obtain multiple independent all-solid-state battery modules. No further limitations are made here.

[0070] Optionally, when the first temporary substrate is a non-flexible material, and when the first area is the area of ​​a single solid-state electrolyte battery, multiple stacked solid-state electrolyte batteries can be formed by coating a carrier plate, then the second temporary substrate can be peeled off, and then encapsulated to obtain a solid-state battery module. This manufacturing process does not require a cutting process.

[0071] It should be noted that this embodiment does not limit the method of peeling off the first temporary substrate and the second temporary substrate. The first temporary substrate or the second temporary substrate can be peeled off by any suitable method in the art. For example, peeling can be performed by any one or more of the following methods: plasma treatment, laser treatment, heat treatment, chemical treatment, etc. Alternatively, to facilitate the peeling off of the first temporary substrate and the second temporary substrate, pretreatment can be performed on the first temporary substrate and the second temporary substrate. For example, pretreatment can be used to form a surface with a certain roughness or an uneven pattern on the surface of the first temporary substrate and the second temporary substrate, and then the positive electrode material layer can be prepared on the surface of the treated first temporary substrate. Alternatively, before providing the first temporary substrate, a transition layer can be provided on the first temporary substrate, and after preparing the positive electrode material layer on the transition layer of the first temporary substrate, the first temporary substrate can be peeled off by a physical or chemical peeling method.

[0072] Optionally, the deposition includes physical vapor deposition. In this embodiment, PVD can be used to prepare each functional layer, or in other embodiments, CVD can be used to prepare one or more functional layers. Preferably, all functional layers in the all-solid-state battery are prepared using PVD. This reduces costs, simplifies the process, and makes it easier to control.

[0073] Optionally, the functional layers can be prepared in a vacuum environment by vacuum deposition.

[0074] Optionally, physical vapor deposition (PVD) includes, but is not limited to, at least one of vacuum evaporation, magnetron sputtering, arc plasma deposition, ion beam epitaxy, or molecular beam epitaxy. In this embodiment, each functional layer in the all-solid-state battery can be prepared using PVD, wherein the PVD process can be various methods such as vacuum evaporation, magnetron sputtering, arc plasma deposition, ion beam epitaxy, or molecular beam epitaxy.

[0075] For example, the positive electrode material layer is formed using PVD methods such as sputtering, and multiple material layers can be formed. For instance, a solid electrolyte layer can be prepared using magnetron sputtering. When preparing the solid electrolyte layer, the material can be transferred into a solid electrolyte deposition chamber, using a LiPO4 target and a N2 protective gas to deposit the solid electrolyte layer of the LiPON all-solid-state lithium battery. Further, the negative electrode material layer, negative electrode current collector, and positive electrode current collector are generated using vacuum evaporation or magnetron sputtering. For example, the negative electrode material layer is generated using vacuum evaporation or magnetron sputtering; the negative electrode current collector and positive electrode current collector are generated using vacuum evaporation or magnetron sputtering.

[0076] It should be noted that the PVD process parameters, conditions, or specific operating methods used in preparing various functional layers, such as the positive electrode material layer, solid electrolyte layer, negative electrode material layer, negative electrode current collector, and positive electrode current collector, can be adjusted by those skilled in the art based on existing technology and actual conditions. This embodiment does not impose any restrictions on this, and will not describe it in detail here.

[0077] Optionally, the positive electrode material layer, solid electrolyte layer, negative electrode material layer, negative electrode current collector, and positive electrode current collector are generated in different process chambers, which can be physical vapor deposition (PVD) vacuum deposition chambers. That is, each functional layer in the all-solid-state battery is fabricated in a separate process chamber using PVD vacuum deposition. Alternatively, the positive electrode material layer, solid electrolyte layer, and negative electrode material layer are generated in different process chambers, while the negative electrode current collector and positive electrode current collector are generated in the same process chamber, which is also a physical vapor deposition (PVD) vacuum deposition chamber. This means that after the negative electrode material layer is formed, a double-sided deposition process can be used to simultaneously deposit the negative electrode current collector and positive electrode current collector on both the negative and positive electrode material layers in the same chamber, thus obtaining an all-solid-state battery. This helps to shorten the overall battery fabrication cycle, reduce the number of chambers for current collector formation, and achieve cost reduction.

[0078] In this embodiment, a solid-state lithium battery is fabricated using PVD coating. Each functional layer in the solid-state battery can be continuously coated in different chambers. The process chambers can be connected by automated linkage equipment, eliminating the need for manual transfer. In this way, the process parameters in the coating equipment can be set according to the requirements of the desired coating layer.

[0079] By employing a segmented, continuous coating method for each functional layer in an all-solid-state battery, production speed and yield can be increased. Using different process chambers for segmented, continuous coating makes the process flow smoother and more efficient, eliminating the need to adjust equipment parameters after completing one functional layer's growth step before proceeding to the next. Furthermore, if growth is performed within the same chamber, the environment within the chamber varies due to different process conditions. The transition from one environment to another takes time, and environmental changes can easily affect film growth, increasing the risk of cross-contamination and potentially impacting film quality and battery efficiency.

[0080] Optionally, the first temporary substrate or the second temporary substrate may be made of a separable flexible material or a non-flexible material.

[0081] Optionally, the flexible material includes at least one of PET film, PP film, PI film, and metal film (or metal foil). The metal foil can be, for example, aluminum foil (Al foil), copper foil, or other metal foils. The metal film can be various flexible metal films such as aluminum film, titanium film, etc. Of course, in other embodiments, polymeric material films similar to PET, PP, and PI, such as PE film and PS film, can also be used, and will not be listed here. Non-flexible materials, such as silicon substrates and glass substrates, are also acceptable.

[0082] Furthermore, the material types of each functional layer in the all-solid-state battery module can refer to relevant technologies, and this embodiment does not limit them. For example, the positive electrode active material in the positive electrode material layer can be selected from LiCoO2, LiMn2O4-LiCoO2, ternary layered lithium nickel cobalt manganese (aluminum) oxide materials, lithium nickel manganese oxide (chemical formula: LiNi 0.5 Mn 1.5 At least one of the following: O4) spinel material, etc. Of course, in other embodiments, any conventional or improved positive electrode active material used in lithium batteries in any related technology can also be used. Preferably, the positive electrode active material in the positive electrode material layer is LiCoO2 or LiMn2O4. The electrolyte material in the solid electrolyte layer can be selected from at least one of LiPN sulfide solid electrolyte, oxide solid electrolyte, LiPON solid electrolyte, single crystal solid electrolyte, etc. Of course, in other embodiments, any conventional or improved solid electrolyte material used in lithium batteries in any related technology can also be used. Preferably, the electrolyte material in the solid electrolyte layer is LiPON. The negative electrode active material in the negative electrode material layer can be selected from at least one of Li, Li metal oxide, or lithium silicon material, etc. Of course, in other embodiments, any conventional or improved negative electrode active material used in lithium batteries in any related technology can also be used. The negative electrode current collector is selected from Cu or Al; the positive electrode current collector is selected from Cu or Al. Preferably, both the positive and negative electrode current collectors are selected from Al.

[0083] In this embodiment, the entire process adopts PVD coating to prepare an all-solid-state lithium battery module. In this all-solid-state lithium battery, preferably, the positive electrode active material is LiCoO2 or LiMn2O4, the solid electrolyte is LiPON, the negative electrode active material is Li or a metal oxide of Li, and both the positive and negative electrode current collectors are Al.

[0084] In some embodiments, the thickness of the positive electrode material layer is 1 μm to 20 μm. In some embodiments, the thickness of the positive electrode material layer is 2 μm to 15 μm. For example, the thickness of the positive electrode material layer can be 1 μm, 2 μm, 4 μm, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 20 μm, etc.

[0085] In this embodiment, the thickness of the positive electrode material layer can be increased by applying multiple coatings, which is convenient, highly operable, and has good thickness controllability.

[0086] In some embodiments, the thickness of the solid electrolyte layer is 0.2 μm to 5 μm. In some embodiments, the thickness of the solid electrolyte layer is 0.5 μm to 3 μm. For example, the thickness of the solid electrolyte layer can be 0.2 μm, 0.4 μm, 0.5 μm, 0.8 μm, 1 μm, 1.5 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.

[0087] In some embodiments, the thickness of the negative electrode material layer is 0.1 μm to 5 μm. In some embodiments, the thickness of the negative electrode material layer is 0.2 μm to 3.5 μm. For example, the thickness of the negative electrode material layer can be 0.1 μm, 0.2 μm, 0.4 μm, 0.5 μm, 0.8 μm, 1 μm, 1.5 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.

[0088] In some embodiments, the thickness of the positive current collector is 0.2 μm to 10 μm, and more specifically, the thickness of the positive current collector is 0.2 μm to 5 μm. In some embodiments, the thickness of the negative current collector is 0.2 μm to 10 μm, and more specifically, the thickness of the negative current collector is 0.2 μm to 5 μm. For example, the thicknesses of the positive and negative current collectors can be 0.2 μm, 0.4 μm, 0.5 μm, 0.8 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, etc., respectively.

[0089] In this embodiment, the thickness of the positive and negative current collectors formed by PVD can be controlled between 0.2 and 5 μm, which can reduce the thickness of the positive and negative current collectors compared with existing preparation methods.

[0090] Based on the same inventive concept, in some embodiments, an all-solid-state battery module is provided, which is prepared by the above-described method for preparing an all-solid-state battery module.

[0091] Those skilled in the art will understand that the all-solid-state battery module and the aforementioned method for preparing the all-solid-state battery module are based on the same inventive concept. The features and advantages described above for the method for preparing the all-solid-state battery module are also applicable to this all-solid-state battery module. Therefore, this all-solid-state battery module has at least the same features and advantages as the aforementioned method for preparing the all-solid-state battery module, which will not be repeated here.

[0092] Example 2

[0093] Please see Figure 3As shown, in some embodiments, a method for fabricating an all-solid-state battery module is provided, including the following steps:

[0094] Step S100: Provide a first temporary substrate, and deposit a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector sequentially on the surface of the first temporary substrate by deposition.

[0095] Step S200: N-1 all-solid-state batteries are sequentially formed on the side of the negative electrode current collector that is away from the negative electrode material layer, where N≥3;

[0096] Step S300: Form a second temporary substrate on the surface of the Nth all-solid-state battery;

[0097] Step S400: Separate the first temporary substrate from the positive electrode material layer;

[0098] Step S500: Using the second temporary substrate as the deposition substrate, a positive electrode current collector is generated on the side of the positive electrode material layer away from the second temporary substrate to form a first all-solid-state battery.

[0099] Step S600: Peel off the second temporary substrate and the Nth all-solid-state electrolyte battery to obtain an all-solid-state battery module; or peel off the second temporary substrate and the Nth all-solid-state electrolyte battery and perform a cutting process to obtain an all-solid-state battery module.

[0100] For specific process steps, please refer to the first embodiment, and no further limitations will be made here.

[0101] Example 3

[0102] Please see Figure 4 As shown, a method for fabricating an all-solid-state battery module includes the following steps:

[0103] Step S100: Provide a first temporary substrate, and deposit a positive electrode material layer, a solid electrolyte layer and a negative electrode material layer sequentially on the surface of the first temporary substrate by deposition.

[0104] Step S200: The first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer and a negative electrode material layer;

[0105] Step S300: Simultaneously deposit positive electrode current collector and negative electrode current collector on both sides of the intermediate body or monolithic structure to obtain the first all-solid-state battery;

[0106] In step S400, a second all-solid-state battery is formed on the positive electrode current collector side or the negative electrode current collector side of the first all-solid-state battery, using the first all-solid-state battery as the deposition substrate.

[0107] Step S500: Repeat or parallelize the above steps multiple times to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries.

[0108] Specifically, in step S200, the first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer, and a negative electrode material layer. When the area of ​​the first temporary substrate is larger than the area of ​​multiple monolithic all-solid electrolyte batteries, a cutting process is performed to cut the intermediate to obtain a monolithic structure. When the area of ​​the first temporary substrate is the area of ​​a monolithic all-solid electrolyte battery, no cutting process is required.

[0109] In step S300, a double-sided deposition process is used to simultaneously deposit negative electrode current collectors and positive electrode current collectors on the negative electrode material layer and the positive electrode material layer in the same chamber, thereby obtaining the first all-solid-state battery. This process can simultaneously form negative electrode current collectors and positive electrode current collectors on both sides of a monolithic structure, thereby shortening the overall battery fabrication cycle, reducing the number of chambers for forming current collectors, and achieving the goal of reducing costs.

[0110] In this embodiment, the first temporary substrate is a temporary substrate with a first area, that is, the area of ​​the first temporary substrate is relatively large (for example, its length and width are not less than 20cm respectively). When the first temporary substrate is flexible, the positive electrode material layer, the solid electrolyte layer and the negative electrode material layer can be grown sequentially on the surface of the first temporary substrate by winding. Then, the substrate is peeled and cut to form a single all-solid electrolyte battery monolithic structure. The monolithic structure is loaded onto the coating carrier plate by the feeding mechanism and transferred to the process cavity. The negative electrode current collector and the positive electrode current collector are deposited on both sides of the intermediate body to form the first solid electrolyte battery. Then, the preparation work of fixing the electrolyte battery is repeated to form multiple stacked solid electrolyte batteries. Finally, the batteries are packaged to obtain multiple all-solid battery modules.

[0111] Therefore, the fabrication process of forming functional layers such as positive electrode material layer, solid electrolyte layer, negative electrode material layer, and negative electrode current collector layer by winding has high production capacity and high efficiency.

[0112] Furthermore, the first temporary substrate is a temporary substrate with a first area, meaning the area of ​​the first temporary substrate is relatively large (e.g., the first area is larger than the area of ​​at least two monolithic all-solid-state electrolyte batteries). When the first temporary substrate is non-flexible, after the intermediate is formed through a peeling process, the intermediate can be loaded onto a coating carrier plate and transferred to the process chamber by a loading mechanism to form the first solid state. Then, the preparation of the solid electrolyte battery is repeated to form multiple stacked solid electrolyte batteries. Finally, they are cut and packaged to obtain multiple all-solid-state battery modules. Specifically, when the first temporary substrate is a non-flexible material, and the first area is the area of ​​two monolithic all-solid-state electrolyte batteries, multiple stacked solid electrolyte batteries are formed, and then cut and packaged to obtain two all-solid-state battery modules.

[0113] Optionally, the area of ​​the first temporary substrate is relatively large, and the cutting process can be adjusted. For example, the cutting can be carried out in the corresponding process steps before the formation of the first solid electrolyte battery, or after the formation of the first solid electrolyte battery, or after the formation of multiple stacked solid electrolyte batteries, and then the cutting and encapsulation can be carried out to obtain multiple independent all-solid-state battery modules. No further limitations are made here.

[0114] In addition, when the first temporary substrate is a non-flexible material and the first area is the area of ​​a single solid-state electrolyte battery, multiple stacked solid-state electrolyte batteries can be formed and then encapsulated to obtain a solid-state battery module. This manufacturing process does not require a cutting process.

[0115] It is understood that Example 3 is basically the same as Example 1, and the similarities will not be repeated. The specific deposition method or battery structure can be referred to the description of Example 1 above.

[0116] Example 4

[0117] Please see Figure 5 As shown, a method for fabricating an all-solid-state battery module includes the following steps:

[0118] Step S100: Provide a first temporary substrate, and deposit a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector sequentially on the surface of the first temporary substrate by deposition.

[0119] Step S200: The first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector;

[0120] Step S300: A positive electrode current collector is deposited on the positive electrode material layer in the coating chamber through a coating process, thereby obtaining the first all-solid-state battery;

[0121] Step S400: Using the first all-solid-state battery as a deposition substrate, a second all-solid-state battery is formed on the positive electrode current collector side or the negative electrode current collector side of the first all-solid-state battery.

[0122] Step S500: Repeat or parallelize the above steps multiple times to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries.

[0123] The main difference between Example 4 and Example 3 is that a stripping process is performed after the negative electrode current collector is formed. Other preparation processes are basically the same as in Example 3, and the similarities will not be repeated. For specific deposition methods or battery structures, please refer to the description of Example 3 above.

[0124] Example 5

[0125] Based on the same inventive concept, in some embodiments, an all-solid-state battery module is provided, which is prepared by the aforementioned method for preparing an all-solid-state battery module.

[0126] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, the term "and / or" as used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0127] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for fabricating an all-solid-state battery module, characterized in that, The method includes: A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially deposited on the surface of the first temporary substrate by deposition. A second temporary substrate is prepared on the surface of the negative electrode current collector that is away from the negative electrode material layer; The first temporary substrate is peeled off from the positive electrode material layer, and the second temporary substrate is used as the deposition substrate to deposit a positive electrode current collector on the surface of the positive electrode material layer away from the solid electrolyte layer, thereby obtaining a first all-solid-state battery. Multiple all-solid-state batteries are sequentially formed on the side of the first all-solid-state battery that is away from the second temporary substrate; The second temporary substrate and the first all-solid-state cell are peeled off to obtain an all-solid-state cell assembly containing multiple electrically connected all-solid-state cells.

2. A method for preparing an all-solid-state battery module, characterized in that, The method includes: A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially deposited on the surface of the first temporary substrate by deposition. N-1 all-solid-state batteries are sequentially formed on the side of the negative electrode current collector that is away from the negative electrode material layer, where N≥3; A second temporary substrate is formed on the side of the Nth all-solid-state battery that is away from the first temporary substrate; The first temporary substrate is peeled off from the positive electrode material layer; Using a second temporary substrate as a substrate, a positive current collector is generated on the side of the positive electrode material layer away from the second temporary substrate to form a first all-solid-state battery. The second temporary substrate and the Nth all-solid-state cell are peeled off to obtain an all-solid-state cell assembly containing multiple electrically connected all-solid-state cells.

3. A method for preparing an all-solid-state battery module, characterized in that, The method includes: A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, and a negative electrode material layer are sequentially deposited on the surface of the first temporary substrate by deposition. The first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer and a negative electrode material layer; or, the first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer and a negative electrode layer, and the intermediate is cut to obtain a monolithic structure. A positive electrode current collector and a negative electrode current collector are deposited on both sides of the intermediate or monolithic structure to obtain a first all-solid-state battery. Using the first all-solid-state battery as a deposition substrate, a second all-solid-state battery is formed on the first all-solid-state battery; The above steps are repeated or performed in parallel multiple times, and a cutting process is performed to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries; or, the above steps are repeated or performed in parallel multiple times to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries.

4. A method for preparing an all-solid-state battery module, characterized in that, The method includes: A first temporary substrate is provided, and a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer, and a negative electrode current collector are sequentially deposited on the surface of the first temporary substrate by deposition. The first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector; or, the first temporary substrate is peeled off from the positive electrode material layer to obtain an intermediate containing a positive electrode material layer, a solid electrolyte layer, a negative electrode material layer and a negative electrode current collector, and the intermediate is cut to obtain a monolithic structure. A positive electrode current collector is deposited on the surface of the positive electrode material layer in the intermediate or the monolithic structure on the side opposite to the solid electrolyte layer to obtain a first all-solid-state battery. Using the first all-solid-state battery as a deposition substrate, a second all-solid-state battery is formed on the first all-solid-state battery; The above steps are repeated or performed in parallel multiple times, and a cutting process is performed to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries; or, the above steps are repeated or performed in parallel multiple times to obtain an all-solid-state battery module containing multiple electrically connected all-solid-state batteries.

5. The method for preparing an all-solid-state battery module according to any one of claims 1-4, characterized in that, The deposition was carried out in a vacuum environment.

6. The method for preparing an all-solid-state battery module according to claim 5, characterized in that, The deposition includes physical vapor deposition, which includes at least one of vacuum evaporation, magnetron sputtering, arc plasma deposition, ion beam or molecular beam epitaxy.

7. The method for preparing an all-solid-state battery module according to any one of claims 1-4, characterized in that, The positive electrode material layer, solid electrolyte layer, negative electrode material layer, negative electrode current collector, and positive electrode current collector are generated in different process chambers, which are physical vapor deposition vacuum coating chambers.

8. The method for preparing an all-solid-state battery module according to any one of claims 1-4, characterized in that, The positive electrode material layer, solid electrolyte layer, and negative electrode material layer are generated in different process chambers, while the negative electrode current collector and positive electrode current collector are generated in the same process chamber, which is a physical vapor deposition vacuum coating chamber.

9. The method for preparing an all-solid-state battery module according to any one of claims 1-4, characterized in that, The positive electrode material layer, solid electrolyte layer, negative electrode material layer, and negative electrode current collector are grown by winding or by coating a substrate.

10. The method for preparing an all-solid-state battery module according to claim 9, characterized in that, The first temporary substrate or the second temporary substrate includes at least one of PET film, PP film, PI film or metal foil, silicon substrate, and glass substrate.

11. The method for preparing an all-solid-state battery module according to any one of claims 1-4, characterized in that, The stripping method includes at least one of plasma treatment, laser treatment, heat treatment or chemical treatment; Alternatively, the provision of the first temporary substrate may be a provision of a first temporary substrate with a transition layer, a positive electrode material layer may be deposited on the transition layer of the first temporary substrate, and then the first temporary substrate may be peeled off by physical or chemical stripping methods.

12. An all-solid-state battery module, characterized in that, The all-solid-state battery module is prepared by the method for preparing an all-solid-state battery module as described in any one of claims 1 to 11.

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