All-solid-state battery and preparation method and application thereof

Abstract

The embodiment of the application provides a kind of all-solid-state battery and its preparation method and application, it is related to battery technical field.The all-solid-state battery includes at least two laminated all-solid-state battery units, each all-solid-state battery unit includes positive plate, negative plate and electrolyte sheet, the root of positive pole lug of positive plate is coated with elastic insulating material, and the surface of positive pole lug and negative pole lug is coated with soft conductive material.Through the all-solid-state battery, the thickness difference of all-solid-state battery unit and pole lug is effectively slowed down in the process of at least two all-solid-state battery units laminated, can be absorbed shear stress by plastic deformation in isostatic pressing process, avoid pole lug fracture, optimize the performance of all-solid-state battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a full solid-state battery and a preparation method and application thereof. BACKGROUND

[0002] With the increasing demand for renewable energy and efficient energy storage systems, full solid-state batteries are crucial in the fields of electric vehicles, portable electronic devices and large-scale energy storage systems due to their superior performance and safety.

[0003] In the process of replacing the traditional liquid lithium ion battery electrolyte with a full solid-state battery, the industrialization faces the problem of low ion transmission efficiency of the solid-solid interface. The current main method is to improve the compaction density of the battery cell through isostatic pressing process to optimize the ion transmission path, that is, the battery cell is placed in a flexible mold, and then uniform high pressure is applied in all directions to increase the contact area between the solid electrolyte and the electrode material, the ion transmission path is optimized, and the overall performance of the battery is improved.

[0004] However, in the isostatic pressing process, the thickness difference between the main body of the battery cell containing multiple layers of coating and the current collector and the tab forms a rigid contact interface during pressing, generating shear stress, which easily leads to tab fracture or damage, causing battery open circuit failure. SUMMARY

[0005] The embodiments of the present application provide a full solid-state battery and a preparation method and application thereof, which are used to solve the problem of battery open circuit failure caused by tab fracture or damage due to stress concentration at the root of the tab during the densification process of the full solid-state battery.

[0006] In a first aspect, the embodiments of the present application provide a full solid-state battery, comprising at least two stacked full solid-state battery cells, each full solid-state battery cell comprising a positive electrode sheet, a negative electrode sheet and an electrolyte sheet;

[0007] Wherein the root of the positive tab in the positive electrode sheet is coated with an elastic insulating material, and the surface of the positive tab is coated with a soft conductive material;

[0008] The surface of the negative tab in the negative electrode sheet is coated with a soft conductive material.

[0009] In a possible implementation, the soft conductive material coated on the surface of the positive tab in each full solid-state battery cell is mutually adhered;

[0010] The soft conductive material coated on the surface of the negative tab in each full solid-state battery cell is mutually adhered.

[0011] In a possible implementation, the surface area of the soft conductive material coated on the tab in each full solid-state battery cell is less than or equal to the surface area of the tab.

[0012] In one possible implementation, in each all-solid-state battery cell, the thickness of the positive electrode active material coating is less than or equal to the thickness of the elastic insulating material coated at the root of the positive electrode tab, and the thickness of the positive electrode active material coating is less than or equal to the thickness of the soft conductive material coated on the surface of the positive electrode tab.

[0013] In one possible implementation, the root of the negative electrode tab in the negative electrode sheet is coated with an elastic insulating material.

[0014] In one possible implementation, in each all-solid-state battery cell, the thickness of the negative electrode active material coating is less than or equal to the thickness of the elastic insulating material coated at the root of the negative electrode tab, and the thickness of the negative electrode active material coating is less than or equal to the thickness of the soft conductive material coated on the surface of the negative electrode tab.

[0015] In one possible implementation, in each all-solid-state battery cell, an elastic insulating material coated at the root of the positive electrode tab is connected to a buffer zone at the edge of the positive electrode, and a soft conductive material coated on the surface of the positive electrode tab is connected to the elastic insulating material coated at the root of the positive electrode tab.

[0016] In one possible implementation, in each all-solid-state battery cell, the elastic insulating material coated at the root of the negative electrode tab is connected to the coating of the negative electrode active material, and the soft conductive material coated on the surface of the negative electrode tab is connected to the elastic insulating material coated at the root of the negative electrode tab.

[0017] In one possible implementation, in each all-solid-state battery cell, the length of the positive electrode tab is greater than or equal to the sum of the length of the soft conductive material coated on the surface of the positive electrode tab and the length of the elastic insulating material coated at the root of the positive electrode tab.

[0018] And / or,

[0019] In each all-solid-state battery cell, the width of the positive electrode tab is less than or equal to the width of the elastic insulating material coated at the root of the positive electrode tab, and the width of the positive electrode tab is equal to the width of the soft conductive material coated on the surface of the positive electrode tab.

[0020] In one possible implementation, in each all-solid-state battery cell, the length of the negative electrode tab is greater than or equal to the sum of the length of the soft conductive material coated on the surface of the negative electrode tab and the length of the elastic insulating material coated at the root of the negative electrode tab.

[0021] And / or,

[0022] In each all-solid-state battery cell, the width of the negative electrode tab is less than or equal to the width of the elastic insulating material coated at the root of the negative electrode tab, and the width of the negative electrode tab is equal to the width of the soft conductive material coated on the surface of the negative electrode tab.

[0023] In a possible implementation, the elastic insulating material is at least one of silica gel, polyurethane, fluororubber, acrylic foam, modified rubber, thermoplastic elastomer, and polyimide.

[0024] And / or, the soft conductive material is at least one of silver-based conductive adhesive, carbon nanotube conductive adhesive, and graphene conductive adhesive.

[0025] In a second aspect, the embodiments of the present application provide a preparation method of a full solid-state battery, and the method comprises:

[0026] A positive electrode sheet, a negative electrode sheet, and an electrolyte sheet are prepared.

[0027] The positive electrode sheet, the electrolyte sheet, and the negative electrode sheet are stacked in sequence, an elastic insulating material is coated at the root of the positive electrode tab of the positive electrode sheet, and a soft conductive material is coated on the surface of the positive electrode tab; a soft conductive material is coated on the surface of the negative electrode tab of the negative electrode sheet, to obtain a full solid-state battery cell.

[0028] At least two full solid-state battery cells are laminated, encapsulated, and subjected to isostatic pressing densification treatment, to obtain the full solid-state battery according to any possible implementation of the first aspect.

[0029] In a possible implementation, the coating of the soft conductive material on the surface of the negative electrode tab of the negative electrode sheet comprises:

[0030] The soft conductive material is coated on the surface of the negative electrode tab of the negative electrode sheet, and an elastic insulating material is coated at the root of the negative electrode tab.

[0031] In a possible implementation, the elastic insulating material is at least one of silica gel, polyurethane, fluororubber, acrylic foam, modified rubber, thermoplastic elastomer, and polyimide.

[0032] And / or, the soft conductive material is at least one of silver-based conductive adhesive, carbon nanotube conductive adhesive, and graphene conductive adhesive.

[0033] In a third aspect, the embodiments of the present application provide an electric device, comprising a device main body and the full solid-state battery according to any possible implementation of the first aspect.

[0034] The application provides a full solid-state battery and a preparation method and application thereof. The full solid-state battery comprises at least two stacked full solid-state battery units, each of which comprises a positive electrode sheet, a negative electrode sheet and an electrolyte sheet. The root of the positive electrode tab of the positive electrode sheet is coated with an elastic insulating material, and the surfaces of the positive electrode tab of the positive electrode sheet and the negative electrode tab of the negative electrode sheet are coated with a soft conductive material. The thickness difference between the full solid-state battery unit and the tab is slowed down during the stacking process of the at least two full solid-state battery units, the shear stress can be absorbed by plastic deformation during isostatic pressing, and the tab is prevented from being broken, so that the performance of the full solid-state battery is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0036] Figure 1 A structural schematic diagram of a full solid-state battery is provided.

[0037] Fig. 2(a) is a surface schematic diagram of a positive electrode tab of a full solid-state battery provided by the application.

[0038] Fig. 2(b) is a cross-sectional schematic diagram of a positive electrode tab of a full solid-state battery provided by the application.

[0039] Fig. 3(a) is a surface schematic diagram of a negative electrode tab of a full solid-state battery provided by the application.

[0040] Fig. 3(b) is a cross-sectional schematic diagram of a negative electrode tab of a full solid-state battery provided by the application.

[0041] Figure 4 A flowchart of a preparation method of a solid-state battery is provided.

[0042] Through the above drawings, the specific embodiments of the application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the application by any means, but to illustrate the concept of the application to those skilled in the art by referring to specific embodiments.

[0043] Explanation of reference signs:

[0044] 101: soft conductive material; 102: elastic insulating material; 103: positive electrode sheet; 104: positive electrode tab; 105: negative electrode sheet; 106: negative electrode tab; 107: electrolyte sheet; 201: positive electrode current collector; 202: positive electrode active material; 203: positive electrode edge buffer zone; 301: negative electrode current collector; 302: negative electrode active material. DETAILED DESCRIPTION

[0045] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made in connection with the drawings, in which the same reference numerals represent the same elements throughout the several figures. The implementations described in the following exemplary embodiments are not meant to represent all implementations consistent with the present disclosure. Rather, they are merely examples in accordance with some aspects of the present disclosure as detailed in the appended claims.

[0046] The application background of the present application is explained as follows:

[0047] As a new type of high energy density energy storage battery, solid-state battery uses solid-state electrolyte to replace the electrolyte of traditional liquid lithium-ion battery, has the advantages of high safety, large energy density and wide applicable temperature, and has important significance for promoting the innovation of energy technology and providing safer, more efficient and more environmentally friendly energy storage solutions.

[0048] The all-solid-state battery technology achieves higher safety by abandoning the electrolyte, but its industrialization is limited by the low efficient ion transport between the solid-state electrolyte and the electrode. The current mainstream solution is to apply isotropic high pressure to the battery cell through isostatic pressing process, and to uniformly compress the battery cell structure with a flexible mold to enhance the physical contact between the solid-state electrolyte and the electrode particles, shorten the ion migration path, and thus improve the overall performance of the battery.

[0049] However, due to the poor deformation ability of the positive / negative electrode sheet, electrolyte sheet and current collector of the all-solid-state battery under high pressure, the thickness difference area cannot release stress through plastic deformation. During the isostatic pressing process, due to the thickness difference between the main body of the battery cell containing multiple layers of coating and the tab, a rigid contact boundary is formed due to the incoordination of compression deformation under high pressure, shear stress is accumulated at the root of the tab, and mechanical fracture or microscopic damage of the tab material is easy to occur, which eventually leads to the open-circuit failure of the battery, becoming a core technical problem to be solved in the large-scale manufacturing of all-solid-state batteries.

[0050] Based on the above technical problems, the inventors found that by coating the root of the positive tab of the stacked multiple all-solid-state battery cells with an elastic insulating material and coating the surface of the positive and negative tabs with a soft conductive material, the elastic modulus of the elastic insulating material and the soft conductive material is lower than the elastic modulus of the solid-state electrolyte, which can effectively reduce the thickness difference between the all-solid-state battery cell and the tab during the stacking process of at least two all-solid-state battery cells, and then absorb the shear stress by plastic deformation during the isostatic pressing process, thereby avoiding tab breakage and optimizing the performance of the all-solid-state battery. At the same time, coating the root of the positive tab of the stacked multiple all-solid-state battery cells with an elastic insulating material and coating the surface of the positive and negative tabs with a soft conductive material does not require modification of existing lamination equipment, and the preparation cost is lower. Based on this, the present application provides an all-solid-state battery and a preparation method and application thereof.

[0051] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes may not be described again in some examples. The embodiments of the present application will be described below with reference to the drawings.

[0052] Figure 1 A structure diagram of an all-solid-state battery provided by the present application is shown in FIG. 1, which includes at least two stacked all-solid-state battery cells, each of which includes a positive sheet 103, a negative sheet 105 and an electrolyte sheet 107. Figure 1

[0053] In one possible implementation, the root of the positive tab 104 in the positive sheet 103 is coated with an elastic insulating material 102, and the surface of the positive tab 104 is coated with a soft conductive material 101.

[0054] The positive sheet 103 generally includes a positive active material and a positive current collector for storing and releasing positive charges of the battery. The negative sheet 105 generally includes a negative active material and a negative current collector for storing and releasing negative charges. The electrolyte sheet 107 is located between the positive sheet 103 and the negative sheet 105, allowing ions to move between the two electrodes, thereby completing the charging and discharging process of the battery.

[0055] The positive tab 104 is a part extending from the positive current collector in the positive sheet 103, used to connect the positive electrode inside the battery to the external circuit, and the root of the positive tab 104 is coated with an elastic insulating material 102 to isolate the positive tab 104 from the negative electrode to prevent short circuiting of the all-solid-state battery; the surface of the positive tab 104 is coated with a soft conductive material 101 to improve the conductivity and connection reliability between the positive tabs 104 and between the tabs and the external circuit, achieving more efficient current transmission.​

[0056] The soft conductive material 101 has good conductivity and flexibility, focusing on conduction and deformation adaptation, providing necessary mechanical cushioning without affecting battery performance. On the one hand, the soft conductive material 101 can closely fit the surface of the positive tab 104, reducing contact resistance and ensuring efficient transmission of current between the positive tabs 104 and between the tabs and the external circuit; on the other hand, the flexibility of the soft conductive material 101 can buffer and absorb the mechanical stress of the positive tab 104 during the isostatic pressing process, avoiding the occurrence of fracture or contact failure between the positive tab 104 and the conductive coating, and maintaining long-term stable conductive connection.

[0057] The elastic insulating material 102 has good insulation and flexibility, focusing on stress buffering and insulation protection. On the one hand, when the positive tab 104 is deformed due to mechanical stress during the isostatic pressing process, the elastic insulating material 102 coated on the root of the positive tab 104 can disperse and absorb mechanical stress through its own deformation, thereby reducing stress concentration directly acting on the root of the positive tab 104 and avoiding fracture of the root of the positive tab 104. On the other hand, the elastic insulating material 102 can isolate the positive tab 104 from the negative electrode, preventing short circuit of the all-solid-state battery due to its insulation properties.

[0058] In one possible implementation, the surface of the negative tab 106 in the negative sheet 105 is coated with a soft conductive material 101.

[0059] The negative tab 106 is a part of the negative current collector in the negative sheet 105, used to connect the negative electrode inside the battery to the external circuit, and the surface of the negative tab 106 is coated with a soft conductive material 101. The technical effects of the soft conductive material 101 coated on the surface of the negative tab 106 are similar to those of the soft conductive material 101 coated on the surface of the positive tab 104, and will not be repeated here.

[0060] Because the elastic modulus of the elastic insulating material 102 and the soft conductive material 101 is lower than that of the solid-state electrolyte, the thickness difference between the all-solid-state battery cell and the tab can be effectively reduced during the stacking of at least two all-solid-state battery cells, thereby absorbing shear stress through plastic deformation during isostatic pressing to avoid tab fracture and optimize all-solid-state battery performance.

[0061] The full solid-state battery provided by the embodiments of the present application is composed of at least two stacked full solid-state battery units, each of which includes a positive electrode sheet, a negative electrode sheet and an electrolyte sheet. The positive electrode sheet and the negative electrode sheet are respectively composed of a positive electrode active material and a positive electrode current collector, and a negative electrode active material and a negative electrode current collector, for storing and releasing electric charges. The electrolyte sheet is located between the positive electrode sheet and the negative electrode sheet, allowing ions to move between the two electrodes, thereby realizing the charging and discharging process of the battery. In the full solid-state battery, the root of the positive electrode tab is coated with an elastic insulating material to prevent direct contact between the positive electrode tab and the negative electrode, thereby avoiding the risk of short circuit. The surface of the positive electrode tab and the negative electrode tab is coated with a soft conductive material to improve the conductivity and connection reliability between the tabs and the external circuit. Through the above full solid-state battery, the good flexibility of the soft conductive material and the elastic insulating material is utilized to effectively reduce the thickness difference between the full solid-state battery unit and the tab during the stacking process of the at least two full solid-state battery units, thereby absorbing shear stress through plastic deformation during isostatic pressing to avoid tab fracture and optimize the performance of the full solid-state battery.

[0062] Based on Figure 1 In an alternative embodiment, the root of the negative electrode tab 106 in the negative electrode sheet 105 is coated with an elastic insulating material 102.

[0063] The negative electrode tab 106 is a part extending from the negative electrode current collector in the negative electrode sheet 105, used to connect the negative electrode inside the battery to the external circuit, and the root thereof is coated with an elastic insulating material 102 to prevent direct contact with the positive electrode. Figure 1 The technical effect of the elastic insulating material 102 coated on the root of the positive electrode tab 104 in the embodiment is similar, which will not be described here.

[0064] In another alternative embodiment, the root of the negative electrode tab 106 in some full solid-state battery units can not be coated with an elastic insulating material 102.

[0065] This is because the area of the negative electrode sheet 105 is generally larger than that of the positive electrode sheet 103, the negative electrode tab 106 has a low probability of contacting the positive electrode, and the risk of accidental short circuit is low. In this case, the root of the negative electrode tab 106 is not coated with an elastic insulating material 102, which can also achieve the technical effect of isolating the negative electrode tab 106 from the positive electrode. The soft conductive material 101 coated on the surface of the negative electrode tab 106 is connected to the negative electrode active material coating. Due to its flexibility, the soft conductive material 101 coated on the surface of the negative electrode tab 106 can buffer and absorb the mechanical stress received by the negative electrode tab 106 during the isostatic pressing process, thereby avoiding the occurrence of fracture or contact failure between the negative electrode tab 106 and the conductive coating, and maintaining long-term stable connection.

[0066] On the basis of the above-mentioned embodiments, the soft conductive material 101 coated on the surface of the positive electrode tab 104 and the negative electrode tab 106 and the elastic insulating material 102 coated at the root of the positive electrode tab 104 and the negative electrode tab 106 specifically include:

[0067] In a possible implementation, the elastic insulating material 102 is at least one of silicone, polyurethane, fluororubber, acrylic foam, modified rubber, thermoplastic elastomer, and polyimide.

[0068] And / or,

[0069] The soft conductive material 101 is at least one of silver-based conductive adhesive, carbon nanotube conductive adhesive, and graphene conductive adhesive.

[0070] Taking the silicone in the elastic insulating material 102 as an example, silicone is a synthetic polymer material composed of siloxane chains, which has excellent thermal stability and weather resistance and can maintain its physical properties at extreme temperatures. Its excellent electrical insulation can effectively prevent current leakage and short circuit. In addition, silicone also has good elasticity and flexibility, and can restore to its original state under mechanical stress. As the elastic insulating material 102 at the root of the tab in the all-solid-state battery, silicone can effectively improve the safety and reliability of the battery, while prolonging its service life.

[0071] Taking the silver-based conductive adhesive in the soft conductive material 101 as an example, silver-based conductive adhesive is made of silver powder or silver nanoparticles dispersed in a polymer matrix. The high conductivity of silver enables silver-based conductive adhesive to effectively conduct current and ensure the reliability of electrical connections. Its soft polymer matrix provides good flexibility and adhesion, which can adapt to the deformation and thermal expansion of different material surfaces without affecting the electrical performance. Silver-based conductive adhesive also has excellent oxidation resistance and chemical stability, which can maintain its conductive properties in harsh environmental conditions. As the soft conductive material 101 on the surface of the tab in the all-solid-state battery, silver-based conductive adhesive can effectively reduce the contact resistance, improve the overall conductivity and efficiency of the battery, and provide mechanical cushioning to reduce contact failure caused by thermal cycling or mechanical stress.

[0072] In a possible implementation, the surface area of the soft conductive material 101 coated on the tab in each all-solid-state unit is less than or equal to the surface area of the tab.

[0073] Due to the lack of fluidity of liquid electrolyte in solid-state electrolyte in all-solid-state batteries, the expansion and contraction of electrode materials easily lead to interface contact failure, which in turn causes battery capacity decay or even open circuit. Coating the elastic insulating material 102 and the soft conductive material 101 can absorb the shear stress at the root of the tab during isostatic pressing through its plastic deformation and effectively relieve the stress at the tab caused by volume strain during battery operation, thereby avoiding tab breakage.

[0074] The surface area of the soft conductive material 101 coated on the tab is less than or equal to the surface area of the tab, avoiding the coated area of the soft conductive material 101 exceeding the tab body, preventing the excess soft conductive material 101 from forming uneven accumulation due to lack of physical support, causing local stress concentration under the battery stacking pressure, leading to coating cracking or peeling, and possibly causing short circuit due to the overflow of the soft conductive material 101 to the adjacent electrolyte layer or separator area. Therefore, by controlling the surface area of the soft conductive material 101 coated on the tab in each all-solid-state cell to be less than or equal to the surface area of the tab, the effective conductive area of the tab is ensured.

[0075] Figure 2(a) is a surface schematic diagram of a positive electrode tab of an all-solid-state battery provided by the present application, and Figure 2(b) is a cross-sectional schematic diagram of a positive electrode tab of an all-solid-state battery provided by the present application. In the embodiments provided by the present application, the positive electrode tab includes a positive tab 104, a positive current collector 201, a positive active material 202, and a positive edge buffer zone 203, wherein the root of the positive tab 104 is coated with an elastic insulating material 102, the surface of the positive tab 104 is coated with a soft conductive material 101, the positive active material 202 is loaded on the surface of the positive current collector 201, and the positive edge buffer zone 203 is located in a part of the edge region of the positive tab, used to alleviate the edge stress shear problem that may be caused by the size difference between the positive and negative tabs by filling a specific material. Figure 1 Based on the embodiments, as shown in Figures 2(a) and 2(b), the positive tab includes a positive tab 104, a positive current collector 201, a positive active material 202, and a positive edge buffer zone 203, wherein the root of the positive tab 104 is coated with an elastic insulating material 102, the surface of the positive tab 104 is coated with a soft conductive material 101, the positive active material 202 is loaded on the surface of the positive current collector 201, and the positive edge buffer zone 203 is located in a part of the edge region of the positive tab, used to alleviate the edge stress shear problem that may be caused by the size difference between the positive and negative tabs by filling a specific material.

[0076] The structure of the positive tab will be described in detail as follows:

[0077] In a possible implementation, the soft conductive material 101 coated on the surface of the positive tab 104 in each all-solid-state cell is adhered to each other.

[0078] For the positive tab 104, the soft conductive material 101 coated on the surface is adhered to each other, forming a continuous conductive path for conducting the positive electrode of at least two all-solid-state cells to form a conductive circuit, not only improving the transmission efficiency of the current between the positive electrodes, but also increasing the mechanical bonding force between the all-solid-state cells, thereby enhancing the stability of the battery structure.

[0079] In a possible implementation, in each all-solid-state cell, the thickness of the positive active material 202 coating is less than or equal to the thickness of the elastic insulating material 102 coated on the root of the positive tab 104, and the thickness of the positive active material 202 coating is less than or equal to the thickness of the soft conductive material 101 coated on the surface of the positive tab 104.

[0080] The positive active material 202 coating layer serves as the core region for lithium ion deintercalation, and its thickness determines the capacity and reaction kinetics of the electrode. A thinner positive active material 202 coating layer can reduce the diffusion path of ions within the battery, thereby improving the charging and discharging speed and efficiency of the battery, and also helps to reduce internal stress and the risk of mechanical failure caused by uneven thickness, thereby improving the durability of the battery. The thickness of the elastic insulating material 102 needs to be sufficient to provide effective electrical insulation and prevent direct electrical contact between the positive current collector 201 and the negative current collector, avoiding the risk of short circuit. The thickness of the soft conductive material 101 needs to be sufficient to ensure good electrical contact and mechanical flexibility. A thicker soft conductive material 101 can provide a larger contact area and lower contact resistance, thereby improving current transmission efficiency.

[0081] As shown in FIG. 2(a) and FIG. 2(b), the positive active material 202 coating layer thickness h1, the elastic insulating material 102 coating thickness at the root of the positive tab 104 h2, and the soft conductive material 101 coating thickness on the surface of the positive tab 104 h3, satisfy the condition that the positive active material 202 coating layer thickness is less than or equal to the elastic insulating material 102 coating thickness at the root of the positive tab 104, and the positive active material 202 coating layer thickness is less than or equal to the soft conductive material 101 coating thickness on the surface of the positive tab 104, i.e. h1≤h2 and h1≤h3. Not only does this effectively prevent direct contact between the positive current collector 201 and other battery components, reducing the risk of short circuit in the battery, but it also improves the transmission efficiency of the current.

[0082] In one possible implementation, in each all-solid-state battery cell, the elastic insulating material 102 coating at the root of the positive tab 104 is connected to the positive edge buffer zone 203, and the soft conductive material 101 coating on the surface of the positive tab 104 is connected to the elastic insulating material 102 coating at the root of the positive tab 104.

[0083] As shown in FIG. 2(a) and FIG. 2(b), by connecting the elastic insulating material 102 coating at the root of the positive tab 104 to the positive edge buffer zone 203, direct electrical contact between the positive current collector 201 and other battery components can be effectively prevented, reducing the risk of short circuit. In addition, additional mechanical support can also be provided, reducing material delamination or peeling caused by thermal expansion and contraction or mechanical stress, thereby improving the reliability and service life of the battery.

[0084] By connecting the soft conductive material 101 coated on the surface of the positive tab 104 with the elastic insulating material 102 coated at the root of the positive tab 104, it can ensure that the effectiveness of electrical isolation and the avoidance of tab breakage during battery preparation and use are maintained while providing good electrical conductivity. The flexibility of the elastic insulating material 102 and the soft conductive material 101 allows them to deform under mechanical stress without being damaged, and this connection can absorb and relieve mechanical stress, reduce the risk of damage at the connection, avoid tab breakage, and thus improve the overall performance and durability of the battery.

[0085] In one possible implementation, in each all-solid-state battery cell, the length of the positive tab 104 is greater than or equal to the sum of the length of the soft conductive material 101 coated on the surface of the positive tab 104 and the length of the elastic insulating material 102 coated at the root of the positive tab 104.

[0086] The soft conductive material 101 is coated along the surface of the tab to bear the interface stress buffer and electronic conduction functions, and its length determines the effective connection range between the positive tabs 104; the elastic insulating material 102 coated at the root needs to completely wrap the transition area of the tab and the electrode body to prevent internal short circuit caused by lithium dendrite growth along the metal / electrolyte interface.

[0087] As shown in FIG. 2(a) and FIG. 2(b), the length l1 of the positive tab 104, the length l2 of the elastic insulating material 102 coated at the root of the positive tab 104, and the length l3 of the soft conductive material 101 coated on the surface of the positive tab 104 satisfy that the length of the positive tab 104 is greater than or equal to the sum of the length of the soft conductive material 101 coated on the surface of the positive tab 104 and the length of the elastic insulating material 102 coated at the root of the positive tab 104, i.e. l1≥l2+l3. This ensures that the necessary electrical isolation and mechanical support are maintained while providing an effective conduction path.

[0088] In one possible implementation, in each all-solid-state battery cell, the width of the positive tab 104 is less than or equal to the width of the elastic insulating material 102 coated at the root of the positive tab 104, and the width of the positive tab 104 is equal to the width of the soft conductive material 101 coated on the surface of the positive tab 104.

[0089] The positive electrode tab 104 width refers to the lateral dimension of the tab in its plane. The positive electrode tab 104 root coated elastic insulating material 102 width refers to the lateral dimension of the insulating material covering the tab root, which is typically required to be greater than or equal to the positive electrode tab 104 width to ensure that the insulating material can completely cover the critical area of the tab, providing effective electrical isolation and preventing short circuits. The positive electrode tab 104 surface coated soft conductive material 101 width refers to the lateral dimension of the conductive material covering the tab surface, which is typically equal to the positive electrode tab 104 width to ensure that the conductive material can completely cover the surface of the tab, providing good electrical contact and conductive performance.

[0090] As shown in FIG. 2(a) and FIG. 2(b), the positive electrode tab 104 width w1, the positive electrode tab 104 root coated elastic insulating material 102 width w2, and the positive electrode tab 104 surface coated soft conductive material 101 width w3 satisfy the condition that the positive electrode tab 104 width is less than or equal to the positive electrode tab 104 root coated elastic insulating material 102 width, and the positive electrode tab 104 width is equal to the positive electrode tab 104 surface coated soft conductive material 101 width, i.e. w2≥w1=w3. This ensures that effective electrical isolation can be provided while also providing good electrical contact and conductive performance.

[0091] The all-solid-state battery provided by the embodiments of the present application has the following advantages. In each all-solid-state battery cell, the soft conductive material coated on the surface of the positive electrode tab is adhered to each other, the surface area of the soft conductive material on the positive electrode tab is controlled to be less than or equal to the surface area of the tab, and the thickness of the positive electrode active material coating is less than or equal to the thickness of the elastic insulating material and the surface soft conductive material at the root of the positive electrode tab. The elastic insulating material at the root of the positive electrode tab is connected to the positive electrode edge buffer zone, and the soft conductive material on the surface of the positive electrode tab is connected to the elastic insulating material, which not only effectively prevents electrical short circuits, but also provides additional mechanical support and can absorb and relieve mechanical stress, thereby improving the overall reliability of the battery. In addition, the length of the positive electrode tab is greater than or equal to the sum of the lengths of the soft conductive material and the elastic insulating material, which ensures effective conductive paths and necessary electrical isolation and mechanical support. The width of the positive electrode tab is less than or equal to the width of the elastic insulating material at the root and equal to the width of the soft conductive material on the surface, to ensure the effectiveness of electrical isolation and good electrical contact performance. Through the above all-solid-state battery, the tab breakage or damage caused by stress concentration at the tab root is effectively prevented, the electrochemical performance, safety, and structural stability of the all-solid-state battery are improved, the service life of the battery is prolonged, and the reliability and durability of the battery under various operating conditions are ensured.

[0092] Figure 3(a) is a schematic view of the surface of a negative electrode tab of a solid-state battery according to the present application, and Figure 3(b) is a schematic view of the cross-section of a negative electrode tab of a solid-state battery according to the present application. Based on the above embodiments, as shown in Figures 3(a) and 3(b), the negative electrode tab comprises a negative electrode tab 106, a negative electrode current collector 301, and a negative electrode active material 302. The root of the negative electrode tab 106 is coated with an elastic insulating material 102, the surface of the negative electrode tab 106 is coated with a soft conductive material 101, and the negative electrode active material 302 is loaded on the surface of the negative electrode current collector 301. The structure of the negative electrode tab is described in detail as follows:

[0093] In a possible implementation, the soft conductive material 101 coated on the surface of the negative electrode tab 106 in each solid-state battery cell is adhered to each other.

[0094] For the negative electrode tab 106, the soft conductive material 101 coated on the surface is adhered to each other to form a continuous conductive path for conducting the negative electrode of at least two solid-state battery cells to form a conductive circuit and ensure efficient current transmission between the negative electrodes.

[0095] In a possible implementation, in each solid-state battery cell, the thickness of the negative electrode active material 302 coating is less than or equal to the thickness of the elastic insulating material 102 coated on the root of the negative electrode tab 106, and the thickness of the negative electrode active material 302 coating is less than or equal to the thickness of the soft conductive material 101 coated on the surface of the negative electrode tab 106.

[0096] As shown in Figures 3(a) and 3(b), the thickness h4 of the negative electrode active material 302 coating, the thickness h5 of the elastic insulating material 102 coated on the root of the negative electrode tab 106, and the thickness h6 of the soft conductive material 101 coated on the surface of the negative electrode tab 106 satisfy that the thickness of the negative electrode active material 302 coating is less than or equal to the thickness of the elastic insulating material 102 coated on the root of the negative electrode tab 106, and the thickness of the negative electrode active material 302 coating is less than or equal to the thickness of the soft conductive material 101 coated on the surface of the negative electrode tab 106, i.e., h4≤h5 and h4≤h6. The technical effects are similar to those of the positive electrode tab, which will not be described here.

[0097] In a possible implementation, in each solid-state battery cell, the elastic insulating material 102 coated on the root of the negative electrode tab 106 is connected to the negative electrode active material 302 coating, and the soft conductive material 101 coated on the surface of the negative electrode tab 106 is connected to the elastic insulating material 102 coated on the root of the negative electrode tab 106.

[0098] The technical effects are similar to those of the positive electrode tab, which will not be described here.

[0099] In a possible implementation, in each all-solid-state battery cell, the length of the negative tab 106 is greater than or equal to the sum of the length of the soft conductive material 101 coated on the surface of the negative tab 106 and the length of the elastic insulating material 102 coated at the root of the negative tab 106.

[0100] As shown in FIG. 3(a) and FIG. 3(b), the length l4 of the negative tab 106, the length l5 of the elastic insulating material 102 coated at the root of the negative tab 106, and the length l6 of the soft conductive material 101 coated on the surface of the negative tab 106 satisfy that the length of the negative tab 106 is greater than or equal to the sum of the length of the soft conductive material 101 coated on the surface of the negative tab 106 and the length of the elastic insulating material 102 coated at the root of the negative tab 106, i.e., l4≥l5+l6. The technical effect is similar to that of the positive tab, which will not be described here.

[0101] In a possible implementation, in each all-solid-state battery cell, the width of the negative tab 106 is less than or equal to the width of the elastic insulating material 102 coated at the root of the negative tab 106, and the width of the negative tab 106 is equal to the width of the soft conductive material 101 coated on the surface of the negative tab 106.

[0102] As shown in FIG. 3(a) and FIG. 3(b), the width w4 of the negative tab 106, the width w5 of the elastic insulating material 102 coated at the root of the negative tab 106, and the width w6 of the soft conductive material 101 coated on the surface of the negative tab 106 satisfy that the width of the negative tab 106 is less than or equal to the width of the elastic insulating material 102 coated at the root of the negative tab 106, and the width of the negative tab 106 is equal to the width of the soft conductive material 101 coated on the surface of the negative tab 106, i.e., w5≥w4=w6. The technical effect is similar to that of the positive tab, which will not be described here.

[0103] The all-solid-state battery provided by the embodiments of the present application is characterized in that, in each all-solid-state battery unit, the soft conductive material coated on the surface of the negative tab is mutually adhered, the surface area of the soft conductive material on the negative tab is controlled to be less than or equal to the surface area of the tab, and the thickness of the negative active material coating is set to be less than or equal to the thickness of the elastic insulating material and the surface soft conductive material at the root of the negative tab. The elastic insulating material at the root of the negative tab is connected with the negative active material coating, and the soft conductive material on the surface of the negative tab is connected with the elastic insulating material, which not only effectively prevents electrical short circuit, but also provides additional mechanical support, absorbs and relieves mechanical stress, and improves the overall reliability of the battery. In addition, the length of the negative tab is greater than or equal to the sum of the lengths of the soft conductive material and the elastic insulating material, which ensures an effective conductive path and necessary electrical isolation and mechanical support. The width of the negative tab is less than or equal to the width of the elastic insulating material at the root and equal to the width of the soft conductive material on the surface, so as to ensure the effectiveness of electrical isolation and good electrical contact performance. Through the all-solid-state battery, the tab breakage or damage caused by stress concentration at the root of the tab is effectively prevented, and the electrochemical performance, safety and structural stability of the all-solid-state battery are improved, thereby prolonging the service life of the battery.

[0104] Figure 4 A flowchart of a preparation method of a solid-state battery provided by the present application is shown in FIG. 1, which comprises the following steps. Figure 4

[0105] S401: A positive tab, a negative tab and an electrolyte tab are prepared.

[0106] In this step, the composite positive material is rolled into a film by dry rolling, and then the positive tab is prepared by die cutting after the composite positive material is combined with the positive current collector; or the positive tab is prepared by die cutting after the composite positive material is wet coated on the positive current collector.

[0107] Similarly, the composite negative material is rolled into a film by dry rolling, and then the negative tab is prepared by die cutting after the composite negative material is combined with the negative current collector; or the negative tab is prepared by die cutting after the composite negative material is wet coated on the negative current collector.

[0108] The composite electrolyte material is prepared into an electrolyte tab by dry rolling; or the composite electrolyte material is prepared into an electrolyte tab by wet coating on a polyester terephthalate film (PET) or a foil, and the electrolyte tab prepared by wet coating needs to be transferred to the positive tab or the negative tab. Through the above method, the positive tab, the negative tab and the electrolyte tab are prepared, which provides a raw material basis for subsequent preparation of the all-solid-state battery.

[0109] ​S402: stack the positive electrode sheet, the electrolyte sheet, and the negative electrode sheet in sequence, coat the root of the positive electrode tab of the positive electrode sheet with an elastic insulating material, and coat the surface of the positive electrode tab with a soft conductive material; coat the surface of the negative electrode tab of the negative electrode sheet with a soft conductive material, to obtain a full solid-state battery cell.

[0110] In this step, the positive electrode sheet, the electrolyte sheet, and the negative electrode sheet are stacked in sequence, wherein the surfaces of the positive electrode tab and the negative electrode tab are coated with a soft conductive material when the positive electrode sheet and the negative electrode sheet are stacked, and the root of the positive electrode tab and the negative electrode tab is coated with an elastic insulating material, to obtain a full solid-state battery cell.

[0111] In an alternative embodiment, the root of the negative electrode tab of the negative electrode sheet is coated with an elastic insulating material, and the surface of the negative electrode tab is coated with a soft conductive material.

[0112] In this step, the positive electrode sheet, the electrolyte sheet, and the negative electrode sheet are stacked in sequence, wherein the surfaces of the positive electrode tab and the negative electrode tab are coated with a soft conductive material when the positive electrode sheet and the negative electrode sheet are stacked, and the root of the positive electrode tab and the negative electrode tab is coated with an elastic insulating material, to obtain a full solid-state battery cell.

[0113] S403: stack at least two full solid-state battery cells, and then encapsulate and isostatic pressure densification treatment to obtain a full solid-state battery.

[0114] In this step, at least two full solid-state battery cells are stacked together to form a complete cell, and the tabs of the positive electrode and the negative electrode of each battery cell are connected to a conductor for transmitting current from the inside of the cell to the external terminals of the cell to form the positive electrode and the negative electrode of the cell. Subsequently, the at least two full solid-state battery cells are encapsulated in an aluminum plastic film and then subjected to isostatic pressure densification treatment to obtain a full solid-state battery.

[0115] In addition, in order to prevent the stress shear of the edge of the electrode sheet caused by the size difference between the positive electrode sheet and the negative electrode sheet, a part of the area located at the edge of the positive electrode sheet, i.e., the positive electrode edge buffer zone, is filled, which can effectively disperse and absorb these stresses, thereby improving the durability and safety of the battery. The positive electrode edge buffer zone can be filled with organic materials such as polypropylene, polyethylene, polyethylene terephthalate, polyamide resin, polytetrafluoroethylene, and polyvinyl chloride, or inorganic materials such as Al2O3, AlN, γ-AlOOH, oxide solid electrolyte, halide solid electrolyte, and sulfide solid electrolyte. The thickness of the filled area is close to the thickness of the positive electrode active material coating.

[0116] The preparation method of the all-solid-state battery provided by the embodiments of the present application prepares the positive electrode sheet, the negative electrode sheet and the electrolyte sheet through a dry or wet process, thereby providing basic materials for the assembly of the all-solid-state battery. Then, the positive electrode sheet, the electrolyte sheet and the negative electrode sheet are stacked in sequence, and the root of the tab is coated with an elastic insulating material and the surface of the tab is coated with a soft conductive material, so as to form an all-solid-state battery cell. Next, a plurality of battery cells are laminated and encapsulated and subjected to isostatic pressing densification treatment, and finally a complete all-solid-state battery is obtained. Through the above method, the problem of battery open-circuit failure caused by tab fracture or damage due to stress concentration at the root of the tab during the densification process of the all-solid-state battery is solved, the durability and safety of the battery are improved, and the reliability and service life of the battery in practical application are enhanced.

[0117] In Figure 4 On the basis of the embodiments, the elastic insulating material in S402 is at least one of silicone, polyurethane, fluororubber, acrylic foam, modified rubber, thermoplastic elastomer and polyimide; and / or the soft conductive material is at least one of silver-based conductive adhesive, carbon nanotube conductive adhesive and graphene conductive adhesive.

[0118] In Figure 4 On the basis of the embodiments, when the positive electrode sheet, the negative electrode sheet and the electrolyte sheet are prepared in S401, the following steps are specifically included.

[0119] The composite positive electrode material includes a positive electrode active material, an electrolyte material, a conductive agent and a binder, wherein the positive electrode active material is LiCoO2, LiMnO2, LiNiO2, LiVO2, LiNi x Co y Mn z O2(x+y+z=1; 0≤x<1, 0≤y<1, 0≤z<1), xLi2MnO3·(1-x)LiTMO2(TM=Ni, Mn, Co, Al; 0 x Co y Al z O2(x+y+z=1; 0≤x<1, 0≤y<1, 0≤z<1), xLi2MnO3·(1-x)LiTMO2(TM=Ni, Mn, Co, Al; 0 12 , Li(Ni 0.5 Mn 1.5 )O4, LiFePO4, LiMnPO4, LiNiPO4, LiCoPO4, LiMn x Fe 1-x PO4(0 x Mn y M zO2(M includes at least three of Co, Ti, V, Cr, Fe, Zn, Mg, Ca, Ru, Sn, Sb, W, Al, Mo, Y, Nb, La, Ce, Eu, or Er, x+y+z=1; 0≤x<1, 0≤y<1, 0≤z<1) at least one. The positive current collector is aluminum, nickel, stainless steel, iron, titanium or carbon, and the shape is a foil or a mesh.

[0120] The composite negative electrode material includes a negative electrode active material, an electrolyte material, a conductive agent, and a binder, wherein the negative electrode active material is at least one of lithium titanate, metal Li, In, Sn and their respective alloys, graphite, hard carbon, soft carbon, mesocarbon microbeads, high-orientation pyrolytic graphite, Si single substance, Si alloy, silicon oxide, silicon-carbon Si active material. The negative current collector is copper, stainless steel, nickel or carbon, and the shape is a foil or a mesh.

[0121] The composite electrolyte material includes an electrolyte material and a binder, and the electrolyte material includes oxide solid-state electrolyte, halide solid-state electrolyte, and sulfide solid-state electrolyte. The electrolyte material is oxide solid-state electrolyte Li 1+ x Al x Ti 2-x (PO4)3(0.1≤x≤0.9), Li7La3Zr2O 12 , Li 6.4 La3Zr 1.4 Ta 0.6 O 12 , Li 0.33 La 0.557 TiO3, LiPON, halide solid-state electrolyte Li3InCl6, Li2ZrCl6, Li3YCl6 or Li3ScCl6 and derivatives of the above compounds, sulfide solid-state electrolyte Li x MP y S z (M is one or more of Sn, Ge, Si, 0 , (X is at least one of halogen elements F, Br and I, 0≤x, 0≤y), at least one of xLi2S·(100-x)P2S5(70≤x≤80) and yLiI·zLiBr·(100-y-z)(xLi2S·(100-x)P2S5)(70≤x≤80, 0≤y≤30, 0≤z≤30).

[0122] The binder is at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), nitrile rubber (NBR), styrene butadiene latex (SBR), polyacrylic acid (PAA), polyisobutylene (PIB), carboxymethyl cellulose (CMC); the conductive agent is at least one of conductive carbon black, carbon nanotube (CNT), carbon nanofiber (CNF), vapor grown carbon fiber (VGCF).

[0123] In Figure 4 Based on the embodiments, in S403, the at least two all-solid-state battery cells are laminated, packaged, and subjected to isostatic pressure densification treatment, wherein the isostatic pressure is 50 MPa-800 MPa, and the isostatic pressure temperature is 25℃-250℃. That is, in the actual isostatic pressure densification process, the isostatic pressure can be 50 MPa, 200 MPa, 400 MPa, 600 MPa, or 800 MPa, and the isostatic pressure temperature can be 25℃, 50℃, 80℃, 100℃, 150℃, 200℃, or 250℃, and in actual application, it can be appropriately adjusted according to specific needs.

[0124] The application also provides a power-using device, which comprises a device main body and the all-solid-state battery described in the foregoing embodiments.

[0125] For example, the all-solid-state battery can be used as a power battery of a vehicle, and is also applicable to the field of 3C (Computers, Communications, and Consumer Electronics) batteries, and is also applicable to aircraft and unmanned aerial vehicles, etc., to provide stable and long-lasting power source and power support.

[0126] Finally, it should be noted that: other embodiments of the application will be readily apparent to those skilled in the art with the consideration of the specification and practice of the application disclosed herein. The application is intended to cover any variations, uses, or adaptive changes of the application that follow the general principles of the application and include common knowledge or conventional technical means in the art that are not disclosed by the application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.

Claims

1. An all-solid battery, characterized by, The full solid-state battery comprises at least two stacked full solid-state battery cells, each of which comprises a positive electrode sheet, a negative electrode sheet and an electrolyte sheet; The root of the positive electrode tab in the positive electrode sheet is coated with an elastic insulating material, and the surface of the positive electrode tab is coated with a soft conductive material; The surface of the negative electrode tab in the negative electrode sheet is coated with a soft conductive material.

2. The all-solid battery according to claim 1, characterized by, The soft conductive material coated on the surface of the positive electrode tab in each full solid-state battery cell is mutually adhered; The soft conductive material coated on the surface of the negative electrode tab in each full solid-state battery cell is mutually adhered.

3. The all-solid battery according to claim 1, characterized by, The surface area of the soft conductive material coated on the tab in each full solid-state battery cell is less than or equal to the surface area of the tab.

4. The all-solid battery according to claim 1, characterized by, In each full solid-state battery cell, the thickness of the positive active material coating is less than or equal to the thickness of the elastic insulating material coated on the root of the positive electrode tab, and the thickness of the positive active material coating is less than or equal to the thickness of the soft conductive material coated on the surface of the positive electrode tab.

5. The all-solid battery according to any one of claims 1 to 4, characterized by, The root of the negative electrode tab in the negative electrode sheet is coated with an elastic insulating material.

6. The all-solid battery according to claim 5, characterized by, In each full solid-state battery cell, the thickness of the negative active material coating is less than or equal to the thickness of the elastic insulating material coated on the root of the negative electrode tab, and the thickness of the negative active material coating is less than or equal to the thickness of the soft conductive material coated on the surface of the negative electrode tab.

7. The all-solid battery according to any one of claims 1 to 4, characterized by, In each full solid-state battery cell, the elastic insulating material coated on the root of the positive electrode tab is connected to the positive edge buffer zone, and the soft conductive material coated on the surface of the positive electrode tab is connected to the elastic insulating material coated on the root of the positive electrode tab.

8. The all-solid battery according to claim 5, characterized by, In each full solid-state battery cell, the elastic insulating material coated on the root of the negative electrode tab is connected to the negative active material coating, and the soft conductive material coated on the surface of the negative electrode tab is connected to the elastic insulating material coated on the root of the negative electrode tab.

9. The all-solid battery according to any one of claims 1 to 4, characterized by, In each full solid-state battery cell, the length of the positive electrode tab is greater than or equal to the sum of the length of the soft conductive material coated on the surface of the positive electrode tab and the length of the elastic insulating material coated on the root of the positive electrode tab; and / or, In each full solid-state battery cell, the width of the positive electrode tab is less than or equal to the width of the elastic insulating material coated on the root of the positive electrode tab, and the width of the positive electrode tab is equal to the width of the soft conductive material coated on the surface of the positive electrode tab.

10. The all-solid battery according to claim 5, characterized by, In each full solid-state battery cell, the length of the negative electrode tab is greater than or equal to the sum of the length of the soft conductive material coated on the surface of the negative electrode tab and the length of the elastic insulating material coated on the root of the negative electrode tab; and / or, In each full solid-state battery cell, the width of the negative electrode tab is less than or equal to the width of the elastic insulating material coated on the root of the negative electrode tab, and the width of the negative electrode tab is equal to the width of the soft conductive material coated on the surface of the negative electrode tab. 11.The all-solid battery according to any one of claims 1 to 4, characterized by, The elastic insulating material is at least one of silicone, polyurethane, fluororubber, acrylic foam, modified rubber, thermoplastic elastomer, and polyimide; and / or, the soft conductive material is at least one of silver-based conductive adhesive, carbon nanotube conductive adhesive, and graphene conductive adhesive.

12. A method of producing an all-solid-state battery, characterized by The method comprises: preparing a positive electrode sheet, a negative electrode sheet and an electrolyte sheet; Stacking the positive electrode sheet, the electrolyte sheet, and the negative electrode sheet in sequence, coating an elastic insulating material at the root of the positive electrode tab of the positive electrode sheet and coating a soft conductive material on the surface of the positive electrode tab; coating a soft conductive material on the surface of the negative electrode tab of the negative electrode sheet, to obtain a full solid-state battery cell; Stacking at least two full solid-state battery cells, encapsulating, and isostatic pressing densification treatment, to obtain the full solid-state battery of any one of claims 1 to 11.

13. The method of claim 12, wherein, The coating of the soft conductive material on the surface of the negative electrode tab of the negative electrode sheet comprises: Coating a soft conductive material on the surface of the negative electrode tab of the negative electrode sheet, and coating an elastic insulating material at the root of the negative electrode tab.

14. The method according to claim 12 or 13, characterized in that, The elastic insulating material is at least one of silicone, polyurethane, fluororubber, acrylic foam, modified rubber, thermoplastic elastomer, and polyimide; And / or, the soft conductive material is at least one of silver-based conductive adhesive, carbon nanotube conductive adhesive, and graphene conductive adhesive.

15. An electrical device, characterized by The device comprises a device body and the full solid-state battery of any one of claims 1 to 11.

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