Battery cell, electrode assembly, battery device and electric device

Abstract

The utility model provides a battery monomer, an electrode assembly, a battery device and a power utilization device, and relates to the field of batteries. The battery cell includes a housing and a solid-state electrode assembly housed within the housing. Wherein the outer surface of the solid-state electrode assembly has an electrolyte residue, and the electrolyte residue comprises an electrolyte salt. The outer surface of the solid-state electrode assembly of the battery monomer has the electrolyte residue, the electrolyte residue comprises the electrolyte salt, and the electrolyte salt can improve the ionic conductivity and reduce the internal resistance of the battery monomer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, an electrode assembly, a battery device and a power utilization device. BACKGROUND

[0002] Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the internal resistance of the battery also needs to be considered. However, the internal resistance of the battery still needs to be further reduced. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a battery monomer, an electrode assembly, a battery device and a power utilization device, which can reduce the internal resistance of the battery.

[0004] In a first aspect, the present application provides a battery monomer, which comprises a shell and a solid-state electrode assembly, the solid-state electrode assembly being accommodated in the shell; wherein the outer surface of the solid-state electrode assembly has electrolyte residues, and the electrolyte residues comprise electrolyte salts.

[0005] The solid-state electrode assembly of the battery monomer has electrolyte residues on the outer surface, and the electrolyte residues comprise electrolyte salts, which can improve the ionic conductivity and reduce the internal resistance of the battery monomer.

[0006] As an optional technical solution of the present application, the electrolyte residues further comprise at least one of sulfides, alcohols and lipids.

[0007] As an optional technical solution of the present application, the electrolyte residues are uniformly distributed on the outer surface of the solid-state electrode assembly.

[0008] In the above technical solution, by uniformly distributing the electrolyte residues on the outer surface of the solid-state electrode assembly, the ionic conductivity is further improved, and the internal resistance of the battery monomer is further reduced.

[0009] As an optional technical solution of the present application, the solid-state electrode assembly comprises a solid-state electrolyte layer and a plurality of electrode sheets, the solid-state electrolyte layer being arranged between two adjacent electrode sheets, and the electrode sheets comprising active material layers, the polarities of the active material layers facing the solid-state electrolyte layer between the two adjacent electrode sheets being opposite.

[0010] In the technical solution, the polarities of the active material layers facing the solid electrolyte layer between the two adjacent pole pieces are opposite, the polarities of the two active material layers adjacent to the solid electrolyte layer and located on both sides of the solid electrolyte layer are opposite, and the solid electrolyte layer simultaneously plays the roles of transmitting ions and isolating the positive active material layer and the negative active material layer.

[0011] As an optional technical solution of the embodiment, the plurality of pole pieces include a positive pole piece and a negative pole piece, the positive pole piece, the solid electrolyte layer and the negative pole piece are stacked, and the solid electrolyte layer is arranged between the positive pole piece and the negative pole piece.

[0012] In the technical solution, the solid electrode assembly includes the positive pole piece, the solid electrolyte layer and the negative pole piece which are stacked, so that the solid electrode assembly is simple and convenient to manufacture and has low cost.

[0013] As an optional technical solution of the embodiment, the pole piece includes a current collector, a positive active material layer and a negative active material layer, and the positive active material layer and the negative active material layer are arranged on both sides of the current collector.

[0014] In the technical solution, by arranging the pole piece to include the current collector, the positive active material layer and the negative active material layer, the battery monomer has higher energy density.

[0015] As an optional technical solution of the embodiment, the active material layer includes a positive active material layer, the positive active material layer includes a lithium-containing compound, and the electrolyte salt includes a lithium salt.

[0016] In the technical solution, the positive active material layer and the electrolyte salt both include lithium ions, which is conducive to further reducing the internal resistance of the battery monomer.

[0017] In a second aspect, the embodiment provides a battery monomer manufacturing method, which includes: isostatic pressing a first packaging bag containing a solid electrode assembly and an electrolyte; discharging at least part of the electrolyte in the first packaging bag; and re-packaging the solid electrode assembly to form a battery monomer.

[0018] In the technical scheme, in the battery cell manufacturing method, the first packaging bag containing the solid electrode assembly and the electrolyte is subjected to isostatic pressing, and the pressure difference between the inside and outside of the first packaging bag can be kept consistent because the electrolyte can fill the cavity in the first packaging bag. In this way, the first packaging bag, the solid electrode assembly and the electrolyte are compacted as a whole, which is conducive to reducing the risk of breakage of the negative electrode sheet during isostatic pressing, and conducive to realizing the densification of the solid electrode assembly and improving the reliability and energy density of the battery cell. In addition, the battery cell manufactured by the battery cell manufacturing method has electrolyte residues on the outer surface of the solid electrode assembly, and the electrolyte residues contain electrolyte salts, which can improve the ion conductivity and reduce the internal resistance of the battery cell.

[0019] As an optional technical scheme of the embodiment of the present application, the electrolyte comprises at least one of an electrolyte salt, a sulfide, an alcohol and a lipid.

[0020] As an optional technical scheme of the embodiment of the present application, after the step of discharging at least part of the electrolyte in the first packaging bag, before the step of re-packaging the solid electrode assembly to form a battery cell, the battery cell manufacturing method further comprises: drying the solid electrode assembly.

[0021] In the technical scheme, after discharging at least part of the electrolyte in the first packaging bag, before re-packaging the solid electrode assembly, the solid electrode assembly is dried, which reduces the residual liquid on the solid electrode assembly and is conducive to improving the energy density of the battery cell.

[0022] As an optional technical scheme of the embodiment of the present application, the solid electrode assembly comprises a positive electrode sheet, a solid electrolyte layer and a negative electrode sheet arranged in layers; after the step of drying the solid electrode assembly, before the step of re-packaging the solid electrode assembly to form a battery cell, the battery cell manufacturing method further comprises: welding a positive electrode tab on the positive electrode sheet; and welding a negative electrode tab on the negative electrode sheet.

[0023] In the technical scheme, after drying the solid electrode assembly, a positive electrode tab is welded on the positive electrode sheet of the solid electrode assembly and a negative electrode tab is welded on the negative electrode sheet of the solid electrode assembly, which is conducive to reducing the interference of the electrolyte with the welding and improving the welding quality.

[0024] As an optional technical scheme of the embodiment of the present application, the step of re-packaging the solid electrode assembly to form a battery cell comprises: placing the solid electrode assembly into a second packaging bag, and packaging the second packaging bag to form the battery cell.

[0025] In the technical solution, the solid electrode assembly is installed in the second packaging bag, which is beneficial to the sealing of the battery monomer, thereby improving the reliability of the battery monomer.

[0026] As an optional technical solution of the embodiment, the time of the isostatic pressing is controlled to be 1-100 minutes in the step of isostatic pressing the first packaging bag containing the solid electrode assembly and the electrolyte.

[0027] In the technical solution, when the time of the isostatic pressing is greater than or equal to 1 minute, the time of the isostatic pressing is relatively long, which is beneficial to improving the densification degree of the solid electrode assembly and improving the energy density of the battery monomer. When the time of the isostatic pressing is less than or equal to 100 minutes, the time of the isostatic pressing is not too long, which is beneficial to shortening the manufacturing time of the battery monomer and improving the manufacturing efficiency of the battery monomer. Therefore, when the time of the isostatic pressing is controlled to be 1-100 minutes, the energy density and the manufacturing efficiency of the battery monomer can be considered.

[0028] As an optional technical solution of the embodiment, the time of the isostatic pressing is controlled to be 5-15 minutes in the step of isostatic pressing the first packaging bag containing the solid electrode assembly and the electrolyte.

[0029] In the technical solution, when the time of the isostatic pressing is greater than or equal to 5 minutes, the time of the isostatic pressing is longer, which is more beneficial to improving the densification degree of the solid electrode assembly and improving the energy density of the battery monomer. When the time of the isostatic pressing is less than or equal to 15 minutes, the time of the isostatic pressing is not too long, which is beneficial to shortening the manufacturing time of the battery monomer and improving the manufacturing efficiency of the battery monomer. Therefore, when the time of the isostatic pressing is controlled to be 5-15 minutes, the energy density and the manufacturing efficiency of the battery monomer can be considered more.

[0030] As an optional technical solution of the embodiment, the temperature of the isostatic pressing is controlled to be 90-300 degrees Celsius in the step of isostatic pressing the first packaging bag containing the solid electrode assembly and the electrolyte.

[0031] In the technical solution, when the temperature of the isostatic pressing is greater than or equal to 90 degrees Celsius, the temperature of the isostatic pressing is relatively high, which is beneficial to improving the combination of sulfides of the solid electrolyte layer and improving the ionic conductivity of the solid electrolyte layer. When the temperature of the isostatic pressing is less than or equal to 300 degrees Celsius, the temperature of the isostatic pressing is not too high, which is beneficial to reducing the risk of spontaneous combustion of the solid electrode assembly. Therefore, when the temperature of the isostatic pressing is controlled to be 90-300 degrees Celsius, the ionic conductivity of the solid electrolyte layer can be improved, and the risk of spontaneous combustion of the solid electrode assembly can be reduced.

[0032] As an optional technical solution of the embodiment of the present application, in the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly and the electrolyte, the temperature of the isostatic pressing is controlled to be 90-150 ℃.

[0033] In the above technical solution, when the temperature of the isostatic pressing is greater than or equal to 90 ℃, the temperature of the isostatic pressing is relatively high, which is conducive to improving the combination of sulfides of the solid-state electrolyte layer and improving the ionic conductivity of the solid-state electrolyte layer. When the temperature of the isostatic pressing is less than or equal to 150 ℃, the temperature of the isostatic pressing is not too high, which is conducive to further reducing the risk of spontaneous combustion of the solid-state electrode assembly. Therefore, when the temperature of the isostatic pressing is controlled to be 90-150 ℃, both the ionic conductivity of the solid-state electrolyte layer and the risk of spontaneous combustion of the solid-state electrode assembly can be improved.

[0034] As an optional technical solution of the embodiment of the present application, in the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly and the electrolyte, the pressure of the isostatic pressing is controlled to be 100-1000 Mpa.

[0035] In the above technical solution, when the pressure of the isostatic pressing is greater than or equal to 100 Mpa, the pressure of the isostatic pressing is relatively high, which is conducive to improving the densification degree of the solid-state electrode assembly and improving the energy density of the battery cell. When the pressure of the isostatic pressing is less than or equal to 1000 Mpa, the pressure of the isostatic pressing is not too high, which is conducive to controlling the production cost. Therefore, when the pressure of the isostatic pressing is controlled to be 100-1000 Mpa, both the energy density of the battery cell and the production cost can be considered.

[0036] As an optional technical solution of the embodiment of the present application, in the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly and the electrolyte, the pressure of the isostatic pressing is controlled to be 300-700 Mpa.

[0037] In the above technical solution, when the pressure of the isostatic pressing is greater than or equal to 300 Mpa, the pressure of the isostatic pressing is higher, which is more conducive to improving the densification degree of the solid-state electrode assembly and improving the energy density of the battery cell. When the pressure of the isostatic pressing is less than or equal to 700 Mpa, the pressure of the isostatic pressing is not too high, which is conducive to controlling the production cost. Therefore, when the pressure of the isostatic pressing is controlled to be 300-700 Mpa, both the energy density of the battery cell and the production cost can be considered.

[0038] As an optional technical solution of the embodiment of the present application, before the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly and the electrolyte, the battery cell manufacturing method further comprises: providing a solid-state electrode assembly; loading the solid-state electrode assembly into the first packaging bag; injecting the electrolyte into the first packaging bag, and packaging the first packaging bag.

[0039] In the above technical solution, in the battery cell manufacturing method, by assembling the solid electrode assembly into the first packaging bag and injecting the electrolyte into the first packaging bag, the electrolyte can fill the cavity in the first packaging bag, so that the pressure difference inside and outside the first packaging bag can be kept consistent when the solid electrode assembly assembled in the first packaging bag is subjected to isostatic pressing. In this way, the first packaging bag, the solid electrode assembly and the electrolyte are compacted as a whole, which is beneficial to reduce the risk of breaking of the negative electrode sheet during isostatic pressing, and is beneficial to realize the densification of the solid electrode assembly and improve the reliability and energy density of the battery cell.

[0040] As an optional technical solution of the embodiment of the present application, the providing a solid electrode assembly comprises: providing a plurality of electrode sheets and providing a solid electrolyte layer; and stacking the plurality of electrode sheets and the solid electrolyte layer, the solid electrolyte layer being arranged between two adjacent electrode sheets.

[0041] In the above technical solution, by stacking the plurality of electrode sheets and the solid electrolyte layer, the manufacturing is simple and convenient, and the production cost is low. In addition, when the solid electrode assembly is isostatically pressed, it is beneficial to improve the densification degree of the solid electrode assembly.

[0042] As an optional technical solution of the embodiment of the present application, the plurality of electrode sheets comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet, the solid electrolyte layer and the negative electrode sheet are stacked, and the solid electrolyte layer is arranged between the positive electrode sheet and the negative electrode sheet; in the step of stacking the plurality of electrode sheets and the solid electrolyte layer, the size of the negative electrode sheet exceeding the positive electrode sheet in the length direction and the width direction is controlled to be 0.1-10mm.

[0043] In the above technical solution, when the size of the negative electrode sheet exceeding the positive electrode sheet in the length direction and the width direction is greater than or equal to 0.1mm, it is beneficial to reduce the assembly difficulty and realize the overhang design. When the size of the negative electrode sheet exceeding the positive electrode sheet in the length direction and the width direction is less than or equal to 10mm, it is beneficial to reduce the volume of the solid electrode assembly, improve the space utilization rate inside the battery cell and improve the energy density of the battery cell. Therefore, when the size of the negative electrode sheet exceeding the positive electrode sheet in the length direction and the width direction is controlled to be 0.1-10mm, both the assembly difficulty can be reduced and the overhang design can be realized, and the energy density of the battery cell can be improved.

[0044] As an optional technical solution of the embodiment of the present application, in the step of stacking the plurality of electrode sheets and the solid electrolyte layer, the size of the negative electrode sheet exceeding the positive electrode sheet in the length direction and the width direction is controlled to be 0.3-3mm.

[0045] In the technical solution, when the size of the negative electrode tab exceeding the size of the positive electrode tab in the length direction and the width direction is greater than or equal to 0.3 mm, the assembly difficulty is reduced, and the overhang design is realized. When the size of the negative electrode tab exceeding the size of the positive electrode tab in the length direction and the width direction is less than or equal to 3 mm, the volume of the solid-state electrode assembly is reduced, the space utilization in the battery monomer is improved, and the energy density of the battery monomer is improved. Therefore, when the size of the negative electrode tab exceeding the size of the positive electrode tab in the length direction and the width direction is controlled to be 0.3-3 mm, the assembly difficulty is further reduced, the overhang design is realized, and the energy density of the battery monomer is further improved.

[0046] As an optional technical solution of the embodiment of the application, after the step of stacking the plurality of electrode tabs and the solid-state electrolyte layer, the solid-state electrode assembly includes: hot-pressing the plurality of electrode tabs and the solid-state electrolyte layer.

[0047] In the technical solution, the plurality of electrode tabs and the solid-state electrolyte layer are hot-pressed to form a relatively stable solid-state electrode assembly structure, which is beneficial to maintaining the shape of the solid-state electrode assembly in subsequent operations.

[0048] In a third aspect, the embodiment of the application further provides an electrode assembly, which is a solid-state electrode assembly, and the outer surface of the solid-state electrode assembly has electrolyte residues, and the electrolyte residues include electrolyte salts.

[0049] As an optional technical solution of the embodiment of the application, the electrolyte residues further include at least one of sulfides, alcohols, and lipids.

[0050] As an optional technical solution of the embodiment of the application, the electrolyte residues are uniformly distributed on the outer surface of the solid-state electrode assembly.

[0051] In the technical solution, the electrolyte residues are uniformly distributed on the outer surface of the solid-state electrode assembly, which is beneficial to further improving the ionic conductivity and further reducing the internal resistance of the battery monomer.

[0052] As an optional technical solution of the embodiment of the application, the solid-state electrode assembly includes a solid-state electrolyte layer and a plurality of electrode tabs, the solid-state electrolyte layer is arranged between two adjacent electrode tabs, and the electrode tab includes an active material layer. In the two adjacent electrode tabs, the polarity of the active material layer facing the solid-state electrolyte layer between the two adjacent electrode tabs is opposite.

[0053] In the technical solution, the polarities of the active material layers facing the solid electrolyte layer between the two adjacent pole pieces are opposite, the polarities of the two active material layers adjacent to the solid electrolyte layer and on both sides of the solid electrolyte layer are opposite, and the solid electrolyte layer simultaneously plays the roles of transmitting ions and isolating the positive active material layer and the negative active material layer.

[0054] As an optional technical solution of the embodiment, the plurality of pole pieces include a positive pole piece and a negative pole piece, the positive pole piece, the solid electrolyte layer, and the negative pole piece are stacked, and the solid electrolyte layer is arranged between the positive pole piece and the negative pole piece.

[0055] In the technical solution, the solid electrode assembly includes the positive pole piece, the solid electrolyte layer, and the negative pole piece which are stacked, so that the solid electrode assembly is simple and convenient to manufacture and has a low cost.

[0056] As an optional technical solution of the embodiment, the pole piece includes a current collector, a positive active material layer, and a negative active material layer, and the positive active material layer and the negative active material layer are arranged on both sides of the current collector.

[0057] In the technical solution, by arranging the pole piece to include the current collector, the positive active material layer, and the negative active material layer, the battery monomer has a higher energy density.

[0058] As an optional technical solution of the embodiment, the active material layer includes a positive active material layer, the positive active material layer includes a lithium-containing compound, and the electrolyte salt includes a lithium salt.

[0059] In the technical solution, the positive active material layer and the electrolyte salt both include lithium ions, which is conducive to further reducing the internal resistance of the battery monomer.

[0060] In a fourth aspect, the embodiment of the present application further provides a battery device, which includes the battery monomer.

[0061] In a fifth aspect, the embodiment of the present application further provides a power utilization device, which includes the battery monomer, and the battery monomer is used to provide electric energy for the power utilization device. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0063] Figure 1 Structure diagram of a vehicle provided for some embodiments of the present application;

[0064] Figure 2 Exploded view of a battery device provided for some embodiments of the present application;

[0065] Figure 3 Exploded view of a battery cell provided for some embodiments of the present application;

[0066] Figure 4 Cross-sectional view of a solid-state electrode assembly provided for some embodiments of the present application;

[0067] Figure 5 Cross-sectional view of a solid-state electrode assembly provided for some embodiments of the present application;

[0068] Figure 6 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application;

[0069] Figure 7 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application;

[0070] Figure 8 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application;

[0071] Figure 9 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application;

[0072] Figure 10 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application;

[0073] Figure 11 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application;

[0074] Figure 12 Schematic block diagram of a battery cell manufacturing method provided for some embodiments of the present application.

[0075] Legend: 10 - case; 11 - first part; 12 - second part; 20 - battery cell; 21 - housing; 211 - case; 212 - end cap; 22 - solid-state electrode assembly; 221 - electrode sheet; 2211 - negative electrode sheet; 2212 - positive electrode sheet; 2213 - current collector; 2214 - negative active material layer; 2215 - positive active material layer; 222 - solid-state electrolyte layer; 23 - electrolyte residue; 30 - battery cell manufacturing method; 100 - battery device; 200 - controller; 300 - motor; 1000 - vehicle. DETAILED DESCRIPTION

[0076] So that the objectives, technical solutions and advantages of the embodiments of the present application are more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0077] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0078] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0079] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0081] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0082] As used herein, the term "plurality" means two or more (including two).

[0083] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material through charging after discharging the battery cell.

[0084] The battery cell generally includes a solid-state electrode assembly. The solid-state electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can reduce the risk of short circuiting between the positive electrode and the negative electrode, while allowing the active ions to pass through.

[0085] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0086] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0087] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0088] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of a battery cell can also be used. These positive electrode active materials can be used alone only one or two or more of them can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04(also referred to as LFP for short)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2(also referred to as NCM 333 for short), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to as NCM 523 for short), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to as NCM 211 for short), LiNi 0.6 Co 0.2 Mn 0.2 O2(also referred to as NCM 622 for short), LiNi 0.8 Co 0.1 Mn 0.1 O2(also referred to as NCM 811 for short), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof, and the like.

[0089] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0090] In some embodiments, the negative electrode can be a negative electrode tab, and the negative electrode tab can include a negative electrode current collector.

[0091] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is provided on either one or both of the two surfaces of the negative current collector.

[0092] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone or in combination of two or more.

[0093] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0094] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0095] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0096] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0097] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfur, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0098] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0099] In some embodiments, the solid-state electrode assembly has a stacked structure.

[0100] As an example, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be alternately stacked.

[0101] As an example, the separators can be provided in plurality, each provided between any adjacent positive or negative electrode tabs.

[0102] In some embodiments, the solid-state electrode assembly is provided with tabs, which can conduct current out of the solid-state electrode assembly. The tabs include positive and negative tabs.

[0103] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the solid-state electrode assembly. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0104] The battery apparatus as referred to in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through busbar components.

[0105] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module.

[0106] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0107] In some embodiments, the battery apparatus can be a battery pack, which can include a box and one or more battery cell assemblies housed in the box.

[0108] As an example, the battery cell assembly can be a battery module, which can be housed in the box by fixing the battery module in the box.

[0109] As an example, the battery cell assembly can also be housed in the box by directly fixing a plurality of battery cells in the box.

[0110] As an example, the box can include a first part and a second part. The first part and the second part are fastened so that a closed space is formed inside the box to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first part can be a top cover or a bottom plate.

[0111] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box to accommodate the battery monomer assembly.

[0112] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can be at least part of a floor of the vehicle, or the frame of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0113] In some embodiments, the battery device refers to an energy storage device, which includes a box, at least one side of the box is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0114] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0115] The development of battery technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, in addition, the internal resistance of the battery also needs to be considered. However, the internal resistance of the battery needs to be further reduced at present.

[0116] Solid-state battery has the characteristics of high energy density. Using solid-state battery in new energy vehicles will significantly improve the endurance of new energy vehicles. The solid-state battery includes a solid-state electrode assembly, and the solid-state electrode assembly includes a solid-state electrolyte layer. At present, the ionic conductivity of the solid-state electrolyte layer is low, which leads to the internal resistance of the battery to be further reduced.

[0117] In view of this, the battery monomer provided by the embodiments of the present application includes a shell and a solid-state electrode assembly, and the solid-state electrode assembly is contained in the shell. The outer surface of the solid-state electrode assembly has electrolyte residues, and the electrolyte residues include electrolyte salt.

[0118] The solid-state electrode assembly of the battery monomer has electrolyte residues on the outer surface, and the electrolyte residues include electrolyte salt, which can improve the ionic conductivity and reduce the internal resistance of the battery monomer.

[0119] The technical solutions described in the embodiments of the present application are suitable for manufacturing battery monomers, and the battery monomers are suitable for various electric devices using battery monomers and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0120] The following embodiments are described by taking the electric device as a vehicle for example.

[0121] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000.

[0122] The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0123] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0124] Please refer to Figure 2 , Figure 2 An exploded view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 can include a box 10 and a battery cell 20, the box 10 being used to accommodate the battery cell 20.

[0125] The box 10 is internally formed with a closed space for accommodating the battery cell 20. The box 10 can adopt various structures. In some embodiments, the box 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 being mutually buckled. The first part 11 and the second part 12 can be various shapes, such as cuboid, cylinder, etc. The first part 11 can be a hollow structure with one side open, and the second part 12 can also be a hollow structure with one side open, the open sides of the first part 11 and the second part 12 being buckled to each other, thereby forming the box 10 with the closed space. Alternatively, the first part 11 can be a hollow structure with one side open, and the second part 12 can be a plate structure, the second part 12 being buckled to the open side of the first part 11, thereby forming the box 10 with the accommodating space.

[0126] In the battery device 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 10. Alternatively, all the battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by the battery cells 20 is accommodated in the box 10.

[0127] In some embodiments, the battery device 100 can further include a busbar component, and the multiple battery cells 20 can be electrically connected through the busbar component to achieve the series connection, the parallel connection, or the mixed connection of the multiple battery cells 20. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

[0128] Please refer to Figure 3 and Figure 4 , Figure 3 the exploded view of the battery cell 20 provided in some embodiments of the present application. Figure 4 the cross-sectional view of the solid-state electrode assembly 22 provided in some embodiments of the present application. The embodiments of the present application provide a battery cell 20, which includes a shell 21 and a solid-state electrode assembly 22 accommodated in the shell 21. The outer surface of the solid-state electrode assembly 22 has an electrolyte residue 23, and the electrolyte residue 23 includes an electrolyte salt.

[0129] The battery cell 20 refers to the smallest unit constituting the battery device 100.

[0130] In some embodiments, the shell 21 can include a housing 211 and an end cover 212. The housing 211 has an opening, and the end cover 212 closes the opening of the housing 211. Here, the closing means covering or closing, which can be sealing or non-sealing.

[0131] The end cover 212 refers to a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the housing 211 to fit the housing 211. Alternatively, the end cover 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 212 is not easy to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the reliability can also be improved. The material of the end cover 212 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like.

[0132] The shell 211 is a component for fitting the end cover 212 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the solid-state electrode assembly 22, the electrolyte, and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is used to cover the opening to form the internal environment of the battery cell 20. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common joint surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is used to cover the shell 211. The shell 211 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the solid-state electrode assembly 22. The material of the shell 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0133] In the embodiment in which the shell 211 is formed with an opening at one end, one end cover 212 can be correspondingly provided. In the embodiment in which the shell 211 is formed with openings at opposite ends, two end covers 212 can be correspondingly provided, and the two end covers 212 respectively seal the two openings of the shell 211, and the two end covers 212 and the shell 211 together define a receiving space for accommodating the solid-state electrode assembly 22.

[0134] The solid-state electrode assembly 22 includes a solid-state electrolyte layer, which includes a polymer solid-state electrolyte layer, an inorganic solid-state electrolyte layer, and a composite solid-state electrolyte layer.

[0135] As an example, the polymer solid-state electrolyte layer can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0136] As an example, the inorganic solid-state electrolyte layer can include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0137] As an example, the composite solid-state electrolyte layer is formed by adding inorganic solid-state electrolyte fillers to the polymer solid-state electrolyte.

[0138] The outer surface of the solid-state electrode assembly 22 has an electrolyte residue 23, which is a part of the electrolyte remaining after drying. The electrolyte residue 23 includes electrolyte salts, which can include lithium hexafluorophosphate, lithium tetrafluoroborate, etc.

[0139] The electrolyte residue 23 can be detected by EDS (Energy Dispersive Spectrometer) or by XPS (X-ray Photoelectron Spectroscopy).

[0140] The electrolyte residue 23 on the outer surface of the solid-state electrode assembly 22 of the battery cell 20 includes electrolyte salt, which can improve ionic conductivity and reduce the internal resistance of the battery cell 20.

[0141] In some embodiments, the electrolyte residue 23 further includes at least one of sulfide, alcohol, and lipid.

[0142] The sulfide can include nickel sulfide, lithium phosphorus oxysulfide, lithium sulfide, etc. The alcohol can include methanol, ethanol, benzyl alcohol, etc. The lipid can include monoglyceride, diglyceride, triglyceride, etc.

[0143] In some embodiments, the electrolyte residue 23 is uniformly distributed on the outer surface of the solid-state electrode assembly 22.

[0144] The electrolyte residue 23 is uniformly distributed on the outer surface of the solid-state electrode assembly 22. Here, the uniform distribution refers to relative uniformity, rather than complete uniformity.

[0145] By uniformly distributing the electrolyte residue 23 on the outer surface of the solid-state electrode assembly 22, it is beneficial to further improve ionic conductivity and further reduce the internal resistance of the battery cell 20.

[0146] Please refer to Figure 3 and Figure 4 In some embodiments, the solid-state electrode assembly 22 includes a solid-state electrolyte layer 222 and a plurality of electrode sheets 221, and the solid-state electrolyte layer 222 is disposed between two adjacent electrode sheets 221. The electrode sheet 221 includes an active material layer, and the polarities of the active material layers facing the solid-state electrolyte layer 222 between the two adjacent electrode sheets 221 are opposite.

[0147] In the two adjacent pole pieces 221, the polarity of the active material layer facing the solid-state electrolyte layer 222 between the two adjacent pole pieces 221 is opposite. In other words, in the two adjacent pole pieces 221, the active material layer facing the solid-state electrolyte layer 222 between the two adjacent pole pieces 221 of one pole piece 221 is a positive active material layer 2215, and the active material layer facing the solid-state electrolyte layer 222 between the two adjacent pole pieces 221 of the other pole piece 221 is a negative active material layer 2214.

[0148] In the two adjacent pole pieces 221, the polarity of the active material layer facing the solid-state electrolyte layer 222 between the two adjacent pole pieces 221 is opposite. In other words, in the two adjacent pole pieces 221, the active material layer facing the solid-state electrolyte layer 222 between the two adjacent pole pieces 221 of one pole piece 221 is a positive active material layer 2215, and the active material layer facing the solid-state electrolyte layer 222 between the two adjacent pole pieces 221 of the other pole piece 221 is a negative active material layer 2214.

[0149] Please refer to Figure 3 and Figure 4 In some embodiments, the plurality of pole pieces 221 includes a positive pole piece 2212 and a negative pole piece 2211, and the positive pole piece 2212, the solid-state electrolyte layer 222 and the negative pole piece 2211 are stacked. The solid-state electrolyte layer 222 is arranged between the positive pole piece 2212 and the negative pole piece 2211.

[0150] The positive pole piece 2212 includes a positive current collector and a positive active material, and the positive active material is coated on the surface of the positive current collector. In some embodiments, the positive current collector also has a portion that is not coated with the positive active material, and the positive current collector that is not coated with the positive active material protrudes from the positive current collector that is coated with the positive active material, and the positive current collector that is not coated with the positive active material serves as a positive tab. In other embodiments, the positive tab can also be a structure that is separately arranged from the positive current collector and then electrically connected.

[0151] The negative pole piece 2211 includes a negative current collector and a negative active material, and the negative active material is coated on the surface of the negative current collector. In some embodiments, the negative current collector also has a portion that is not coated with the negative active material, and the negative current collector that is not coated with the negative active material protrudes from the negative current collector that is coated with the negative active material, and the negative current collector that is not coated with the negative active material serves as a negative tab. In other embodiments, the negative tab can also be a structure that is separately arranged from the negative current collector and then electrically connected.

[0152] The outer surface of the positive electrode sheet 2212, the outer surface of the solid-state electrolyte layer 222, and the outer surface of the negative electrode sheet 2211 each have electrolyte residue 23.

[0153] The solid-state electrolyte layer 222 is disposed between the positive electrode sheet 2212 and the negative electrode sheet 2211, and simultaneously functions to transport ions and isolate the positive electrode sheet 2212 and the negative electrode sheet 2211.

[0154] The solid-state electrode assembly includes the positive electrode sheet 2212, the solid-state electrolyte layer 222, and the negative electrode sheet 2211 stacked, so that the solid-state electrode assembly is simple and convenient to manufacture, and has a relatively low cost.

[0155] Please refer to Figure 5 , Figure 5 A cross-sectional view of a solid-state electrode assembly is provided for some embodiments of the present application. In some embodiments, the electrode sheet 221 includes a current collector 2213, a positive active material layer 2215, and a negative active material layer 2214, and the positive active material layer 2215 and the negative active material layer 2214 are respectively disposed on both sides of the current collector 2213.

[0156] The electrode sheet 221 is a bipolar electrode sheet, and one side of the electrode sheet 221 is provided with the positive active material layer 2215, and the other side of the electrode sheet 221 is provided with the negative active material layer 2214.

[0157] The outer surface of the current collector 2213, the outer surface of the positive active material layer 2215, and the outer surface of the negative active material layer 2214 each have electrolyte residue 23.

[0158] By making the electrode sheet 221 include the current collector 2213, the positive active material layer 2215, and the negative active material layer 2214, it is beneficial to make the battery monomer 20 have a higher energy density.

[0159] In some embodiments, the active material layer includes the positive active material layer 2215, the positive active material layer 2215 includes a lithium-containing compound, and the electrolyte salt includes a lithium salt.

[0160] The positive active material layer 2215 can include ternary lithium, lithium iron phosphate, etc. The electrolyte salt can include lithium hexafluorophosphate, lithium tetrafluoroborate, etc.

[0161] The positive active material layer 2215 and the electrolyte salt each include lithium ions, which is beneficial to further reduce the internal resistance of the battery monomer 20.

[0162] Please refer to Figure 6 , Figure 6 A schematic block diagram of a battery monomer manufacturing method 30 is provided for some embodiments of the present application. The embodiments of the present application provide a battery monomer manufacturing method 30, which includes:

[0163] Step S100: The first packaging bag containing the solid electrode assembly 22 and electrolyte is isostatically pressed.

[0164] Step S200: Drain at least a portion of the electrolyte from the first packaging bag;

[0165] Step S300: Repackage the solid electrode assembly 22 to form a battery cell 20.

[0166] In step S100, the first encapsulation bag containing the solid electrode assembly 22 and the electrolyte can be placed into the hydraulic oil, and then the hydraulic oil can be pressurized to achieve isostatic pressure treatment.

[0167] The working principle of isostatic pressing is based on Pascal's law: "Pressure in a medium (liquid or gas) within a closed container is transmitted equally in all directions." Isostatic pressing facilitates the densification of the solid-state electrode assembly 22, thereby improving the reliability and energy density of the battery cell 20.

[0168] In step S200, the first packaging bag is opened and at least a portion of the electrolyte in the first packaging bag is discharged.

[0169] In step S300, the solid electrode assembly 22 is repackaged. During packaging, the first packaging bag described above can be used, or other packaging structures can be used.

[0170] In this battery cell manufacturing method 30, the first encapsulation bag containing the solid electrode assembly 22 and electrolyte is isostatically pressed. Because the electrolyte fills the cavity within the first encapsulation bag, the pressure difference between the inside and outside of the first encapsulation bag remains consistent during isostatic pressing. This compacts the first encapsulation bag, the solid electrode assembly 22, and the electrolyte as a whole, reducing the risk of breakage of the negative electrode sheet 2211 during isostatic pressing, promoting densification of the solid electrode assembly, and improving the reliability and energy density of the battery cell 20. Furthermore, the battery cell 20 manufactured using this method 30 has electrolyte residue 23 on the outer surface of its solid electrode assembly 22. The electrolyte residue 23 includes electrolyte salts, which can improve ionic conductivity and reduce the internal resistance of the battery cell 20. In some embodiments, the electrolyte includes at least one of electrolyte salts, sulfides, alcohols, and esters.

[0171] Electrolyte salts may include lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate, etc.

[0172] The sulfides can include nickel sulfide, lithium phosphorus oxysulfide, lithium sulfide, etc.

[0173] The alcohols can include methanol, ethanol, benzyl alcohol, etc.

[0174] The lipids can include monoglyceride, diglyceride, triglyceride, ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone, etc.

[0175] Please refer to Figure 7 , Figure 7 A schematic block diagram of the battery cell manufacturing method 30 provided by some embodiments of the present application is shown in FIG. 2. In some embodiments, after the step of discharging at least part of the electrolyte in the first packaging bag, before the step of re-packaging the solid-state electrode assembly 22 to form the battery cell 20, the battery cell manufacturing method 30 further includes:

[0176] Step S250: drying the solid-state electrode assembly 22.

[0177] Step S250 is located after step S200 and before step S300, that is, after the first packaging bag is opened and at least part of the electrolyte is discharged, the solid-state electrode assembly 22 is dried, and then the solid-state electrode assembly 22 is re-packaged.

[0178] After discharging at least part of the electrolyte in the first packaging bag, before re-packaging the solid-state electrode assembly 22, drying the solid-state electrode assembly 22 reduces the residual liquid on the solid-state electrode assembly 22, which is beneficial to improving the energy density of the battery cell 20.

[0179] Please refer to Figure 8 , Figure 8 A schematic block diagram of the battery cell manufacturing method 30 provided by some embodiments of the present application is shown in FIG. 2. In some embodiments, the solid-state electrode assembly 22 includes a positive electrode sheet 2212, a solid-state electrolyte layer 222, and a negative electrode sheet 2211 arranged in a stack. After the step of drying the solid-state electrode assembly 22, before the step of re-packaging the solid-state electrode assembly 22 to form the battery cell 20, the battery cell manufacturing method 30 further includes: step S260: welding a positive electrode tab on the positive electrode sheet 2212 and welding a negative electrode tab on the negative electrode sheet 2211.

[0180] Step S260 is located after step S250 and before step S300, that is, after the first packaging bag is opened and at least part of the electrolyte is discharged, the solid-state electrode assembly 22 is first dried, then the positive electrode tab is welded on the positive electrode tab 2212, and the negative electrode tab is welded on the negative electrode tab 2211, and then the solid-state electrode assembly 22 is re-packaged.

[0181] In step S260, the positive electrode tab is welded on the positive electrode current collector 2213 of the positive electrode tab 2212, and the negative electrode tab is welded on the negative electrode current collector 2213 of the negative electrode tab 2211.

[0182] After the solid-state electrode assembly 22 is dried, the positive electrode tab is welded on the positive electrode tab 2212 of the solid-state electrode assembly 22, and the negative electrode tab is welded on the negative electrode tab 2211 of the solid-state electrode assembly 22, which is beneficial to reduce the interference of the electrolyte on the welding and improve the welding quality.

[0183] Please refer to Figure 9 , Figure 9 A schematic block diagram of the battery cell manufacturing method 30 provided by some embodiments of the present application is shown. In some embodiments, re-packaging the solid-state electrode assembly 22 to form the battery cell 20 comprises:

[0184] Step S310: The solid-state electrode assembly 22 is loaded into a second packaging bag, and the second packaging bag is packaged to form the battery cell 20.

[0185] In step S310, the second packaging bag and the first packaging bag are different packaging bags. The second packaging bag has an open-ended accommodating cavity, and the solid-state electrode assembly 22 can be loaded into the second packaging bag from the open end of the second packaging bag. The second packaging bag can be a soft shell such as an aluminum plastic film, a heat shrink film, etc.

[0186] The packaging process makes the accommodating cavity form a sealed space and enclose the solid-state electrode assembly 22 in the accommodating cavity. The packaging process of the second packaging bag includes but is not limited to melting, welding, setting a sealing member, etc. Optionally, packaging the second packaging bag comprises vacuum packaging the second packaging bag.

[0187] By loading the solid-state electrode assembly 22 into the second packaging bag, it is beneficial to make the battery cell 20 have better sealing performance, thereby improving the reliability of the battery cell 20.

[0188] In some embodiments, in the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly 22 and the electrolyte, the time of isostatic pressing is controlled to be 1-100 min.

[0189] In step S400, the time of isostatic pressing is greater than or equal to 1 min and less than or equal to 100 min.

[0190] The isostatic pressing time can be 1 min, 5 min, 10 min, 15 min, 20 min, 25 min, 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, etc.

[0191] When the isostatic pressing time is greater than or equal to 1 min, the isostatic pressing time is relatively long, which is beneficial to improve the densification degree of the solid-state electrode assembly 22 and improve the energy density of the battery cell 20. When the isostatic pressing time is less than or equal to 100 min, the isostatic pressing time is not too long, which is beneficial to shorten the manufacturing time of the battery cell 20 and improve the manufacturing efficiency of the battery cell 20. Therefore, when the isostatic pressing time is controlled to be 1-100 min, the energy density and the manufacturing efficiency of the battery cell 20 can be considered.

[0192] Optionally, in the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly 22 and the electrolyte, the isostatic pressing time is controlled to be 5-15 min.

[0193] In step S100, the isostatic pressing time is greater than or equal to 5 min and less than or equal to 15 min.

[0194] The isostatic pressing time can be 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, etc.

[0195] When the isostatic pressing time is greater than or equal to 5 min, the isostatic pressing time is longer, which is more beneficial to improve the densification degree of the solid-state electrode assembly 22 and improve the energy density of the battery cell 20. When the isostatic pressing time is less than or equal to 15 min, the isostatic pressing time is not too long, which is beneficial to shorten the manufacturing time of the battery cell 20 and improve the manufacturing efficiency of the battery cell 20. Therefore, when the isostatic pressing time is controlled to be 5-15 min, the energy density and the manufacturing efficiency of the battery cell 20 can be considered.

[0196] In some embodiments, in the step of isostatic pressing the first packaging bag containing the solid-state electrode assembly 22 and the electrolyte, the isostatic pressing temperature is controlled to be 90-300°C.

[0197] In step S100, the isostatic pressing temperature is greater than or equal to 90°C and less than or equal to 300°C.

[0198] The isostatic pressing temperature can be 90°C, 110°C, 130°C, 150°C, 180°C, 200°C, 220°C, 250°C, 280°C, 300°C, etc.

[0199] When the temperature of the isostatic pressing is greater than or equal to 90°C, the temperature of the isostatic pressing is high, which is conducive to improving the binding property of the sulfide of the solid-state electrolyte layer 222 and improving the ionic conductivity of the solid-state electrolyte layer 222. When the temperature of the isostatic pressing is less than or equal to 300°C, the temperature of the isostatic pressing is not too high, which is conducive to reducing the risk of self-ignition of the solid-state electrode assembly 22. Therefore, when the temperature of the isostatic pressing is controlled to be 90-300°C, both the ionic conductivity of the solid-state electrolyte layer 222 and the risk of self-ignition of the solid-state electrode assembly 22 can be reduced.

[0200] Optionally, in the step of isostatic pressing of the first packaging bag containing the solid-state electrode assembly 22 and the electrolyte, the temperature of the isostatic pressing is controlled to be 90-150°C.

[0201] In step S100, the temperature of the isostatic pressing is greater than or equal to 90°C and less than or equal to 150°C.

[0202] The temperature of the isostatic pressing can be 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, etc.

[0203] When the temperature of the isostatic pressing is greater than or equal to 90°C, the temperature of the isostatic pressing is high, which is conducive to improving the binding property of the sulfide of the solid-state electrolyte layer 222 and improving the ionic conductivity of the solid-state electrolyte layer 222. When the temperature of the isostatic pressing is less than or equal to 150°C, the temperature of the isostatic pressing is not too high, which is conducive to further reducing the risk of self-ignition of the solid-state electrode assembly 22. Therefore, when the temperature of the isostatic pressing is controlled to be 90-150°C, both the ionic conductivity of the solid-state electrolyte layer 222 and the risk of self-ignition of the solid-state electrode assembly 22 can be further reduced.

[0204] In some embodiments, in the step of isostatic pressing of the first packaging bag containing the solid-state electrode assembly 22 and the electrolyte, the pressure of the isostatic pressing is controlled to be 100-1000Mpa.

[0205] In step S100, the pressure of the isostatic pressing is greater than or equal to 100Mpa and less than or equal to 1000Mpa.

[0206] The pressure of the isostatic pressing can be 100Mpa, 200Mpa, 300Mpa, 400Mpa, 500Mpa, 600Mpa, 700Mpa, 800Mpa, 900Mpa, 1000Mpa, etc.

[0207] When the isostatic pressure is greater than or equal to 100 MPa, the higher pressure is beneficial for increasing the density of the solid-state electrode assembly 22 and improving the energy density of the battery cell 20. When the isostatic pressure is less than or equal to 1000 MPa, the pressure is not too high, the requirements for production equipment are not too demanding, and production costs are easier to control. Therefore, when the isostatic pressure is controlled between 100 and 1000 MPa, both the energy density of the battery cell 20 and the production cost can be balanced.

[0208] Optionally, in the step of isostatically packing the solid electrode assembly 22 and electrolyte in the first packaging bag, the isostatic pressure is controlled at 300-700 MPa.

[0209] In step S100, the isostatic pressure is greater than or equal to 300 MPa and less than or equal to 700 MPa.

[0210] The isostatic pressure can be: 300Mpa, 350Mpa, 400Mpa, 450Mpa, 500Mpa, 550Mpa, 600Mpa, 650Mpa, 700Mpa, etc.

[0211] When the isostatic pressure is greater than or equal to 300 MPa, the higher pressure is more conducive to improving the densification of the solid-state electrode assembly 22 and increasing the energy density of the battery cell 20. When the isostatic pressure is less than or equal to 700 MPa, the pressure is not too high, the requirements for production equipment are not too demanding, and production costs are easier to control. Therefore, when the isostatic pressure is controlled between 300 and 700 MPa, it is possible to better balance the energy density of the battery cell 20 and the production cost.

[0212] Please refer to Figure 10 , Figure 10 This is a schematic block diagram of a battery cell manufacturing method 30 provided for further embodiments of this application. In some embodiments, prior to the step of isostatically packing a first encapsulation bag containing the solid electrode assembly 22 and the electrolyte, the battery cell manufacturing method 30 further includes:

[0213] Step S10: Provide solid-state electrode assembly 22;

[0214] Step S20: Pack the solid-state electrode assembly 22 into the first packaging bag;

[0215] Step S30: Inject electrolyte into the first packaging bag and seal the first packaging bag.

[0216] In step S20, the first packaging bag has a receiving cavity with an opening at one end, allowing the solid electrode assembly 22 to be inserted into the first packaging bag through the opening. The first packaging bag can be a soft outer shell, such as aluminum-plastic film or heat-shrink film.

[0217] In step S30, an electrolyte is injected into the first packaging bag from the open end of the first packaging bag. The electrolyte does not react with the solid-state electrolyte layer 222 of the solid-state electrode assembly 22. The packaging process of the first packaging bag includes, but is not limited to, melting, welding, setting a sealing member, etc.

[0218] Optionally, the packaging of the first packaging bag includes vacuum packaging the first packaging bag.

[0219] In the battery cell manufacturing method 30, by loading the solid-state electrode assembly 22 into the first packaging bag and injecting the electrolyte into the first packaging bag, the electrolyte can fill the cavity in the first packaging bag, so that the pressure difference inside and outside the first packaging bag can be kept consistent when the solid-state electrode assembly 22 loaded into the first packaging bag is subjected to isostatic pressing. In this way, the first packaging bag, the solid-state electrode assembly 22 and the electrolyte are compacted as a whole, which is conducive to reducing the risk of breakage of the negative electrode sheet 2211 during isostatic pressing, and is conducive to achieving densification of the solid-state electrode assembly 22 and improving the reliability and energy density of the battery cell 20.

[0220] Please refer to Figure 11 , Figure 11 A schematic block diagram of the battery cell manufacturing method 30 provided for another embodiment of the present application is provided. In some embodiments, providing the solid-state electrode assembly 22 includes:

[0221] Step S11: providing a plurality of electrode sheets 221 and providing a solid-state electrolyte layer 222;

[0222] Step S12: stacking the plurality of electrode sheets 221 and the solid-state electrolyte layer 222, and the solid-state electrolyte layer 222 is arranged between two adjacent electrode sheets 221.

[0223] By stacking the plurality of electrode sheets 221 and the solid-state electrolyte layer 222, the manufacturing is simple and convenient, and the production cost is relatively low. In addition, when the solid-state electrode assembly 22 is subjected to isostatic pressing, it is conducive to improving the densification degree of the solid-state electrode assembly 22.

[0224] In some embodiments, the plurality of electrode sheets 221 includes a positive electrode sheet 2212 and a negative electrode sheet 2211, and the positive electrode sheet 2212, the solid-state electrolyte layer 222 and the negative electrode sheet 2211 are stacked, and the solid-state electrolyte layer 222 is arranged between the positive electrode sheet 2212 and the negative electrode sheet 2211. In the step of stacking the plurality of electrode sheets 221 and the solid-state electrolyte layer 222, the negative electrode sheet 2211 is controlled to be 0.1-10mm larger than the size of the positive electrode sheet 2212 in the length direction and the width direction.

[0225] The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction is greater than or equal to 0.1 mm and less than or equal to 10 mm. The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the width direction is greater than or equal to 0.1 mm and less than or equal to 100 mm.

[0226] The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction can be the same as or different from the size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the width direction.

[0227] The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction can be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or the like.

[0228] The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the width direction can be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or the like.

[0229] When the size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction and the width direction is greater than or equal to 0.1 mm, it is beneficial to reduce the assembly difficulty and realize the overhang design. When the size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction and the width direction is less than or equal to 10 mm, it is beneficial to reduce the volume of the solid-state electrode assembly 22, improve the space utilization rate inside the battery monomer 20, and improve the energy density of the battery monomer 20. Therefore, when the size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction and the width direction is controlled to be 0.1-10 mm, both the assembly difficulty can be reduced and the overhang design can be realized, and the energy density of the battery monomer 20 can be improved.

[0230] Optionally, in the step of stacking the plurality of electrode tabs 221 and the solid-state electrolyte layer 222, the size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction and the width direction is controlled to be 0.3-3 mm.

[0231] The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the length direction is greater than or equal to 0.3 mm and less than or equal to 3 mm. The size of the negative electrode tab 2211 exceeding the positive electrode tab 2212 in the width direction is greater than or equal to 0.3 mm and less than or equal to 3 mm.

[0232] The size of the negative electrode tab 2211 exceeding the size of the positive electrode tab 2212 in the length direction can be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, etc.

[0233] The size of the negative electrode tab 2211 exceeding the size of the positive electrode tab 2212 in the width direction can be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, etc.

[0234] When the size of the negative electrode tab 2211 exceeding the size of the positive electrode tab 2212 in the length direction and the width direction is greater than or equal to 0.3 mm, it is more conducive to reducing the assembly difficulty and realizing the overhang design. When the size of the negative electrode tab 2211 exceeding the size of the positive electrode tab 2212 in the length direction and the width direction is less than or equal to 3 mm, it is more conducive to reducing the volume of the solid-state electrode assembly 22, improving the space utilization rate inside the battery monomer 20, and improving the energy density of the battery monomer 20. Therefore, when the size of the negative electrode tab 2211 exceeding the size of the positive electrode tab 2212 in the length direction and the width direction is controlled to be 0.3-3 mm, both the assembly difficulty can be further reduced and the overhang design can be realized, and the energy density of the battery monomer 20 can be further improved.

[0235] Please refer to Figure 12 , Figure 12 The battery monomer manufacturing method 30 provided by some embodiments of the present application is schematically shown in the block diagram. After the step of stacking the plurality of electrode tabs 221 and the solid-state electrolyte layer 222, the solid-state electrode assembly 22 is provided, including:

[0236] Step S13: hot-pressing the plurality of electrode tabs 221 and the solid-state electrolyte layer 222.

[0237] By hot-pressing the plurality of electrode tabs 221 and the solid-state electrolyte layer 222, the plurality of electrode tabs 221 and the solid-state electrolyte layer 222 form a relatively stable solid-state electrode assembly structure, which is conducive to maintaining the shape of the solid-state electrode assembly in the subsequent operation process.

[0238] Please refer to Figure 4 and Figure 5 The present application further provides an electrode assembly, which is the solid-state electrode assembly 22. The outer surface of the solid-state electrode assembly 22 has an electrolyte residue 23, and the electrolyte residue 23 includes an electrolyte salt.

[0239] In some embodiments, the electrolyte residue 23 further includes at least one of a sulfide, an alcohol, and a lipid.

[0240] In some embodiments, the electrolyte residue 23 is uniformly distributed on the outer surface of the solid-state electrode assembly 22. By uniformly distributing the electrolyte residue 23 on the outer surface of the solid-state electrode assembly 22, it is beneficial to further improve the ionic conductivity and further reduce the internal resistance of the battery monomer 20.

[0241] In some embodiments, the solid-state electrode assembly 22 includes a solid-state electrolyte layer 222 and a plurality of electrode sheets 221, the solid-state electrolyte layer 222 is arranged between two adjacent electrode sheets 221, the electrode sheet 221 includes an active material layer, and the polarities of the active material layers facing the solid-state electrolyte layer 222 between the two adjacent electrode sheets 221 are opposite. In the two adjacent electrode sheets 221, the polarities of the active material layers facing the solid-state electrolyte layer 222 between the two adjacent electrode sheets 221 are opposite, and the polarities of the two active material layers adjacent to the solid-state electrolyte layer 222 and on both sides of the solid-state electrolyte layer 222 are opposite. The solid-state electrolyte layer 222 simultaneously plays the roles of transmitting ions and isolating the positive active material layer 2215 and the negative active material layer 2214.

[0242] In some embodiments, the plurality of electrode sheets 221 includes a positive electrode sheet 2212 and a negative electrode sheet 2211, the positive electrode sheet 2212, the solid-state electrolyte layer 222 and the negative electrode sheet 2211 are arranged in layers, and the solid-state electrolyte layer 222 is arranged between the positive electrode sheet 2212 and the negative electrode sheet 2211. The solid-state electrode assembly includes the positive electrode sheet 2212, the solid-state electrolyte layer 222 and the negative electrode sheet 2211 arranged in layers, so that the solid-state electrode assembly is simple and convenient to manufacture, and has a lower cost.

[0243] In other embodiments, the electrode sheet 221 includes a current collector 2213, a positive active material layer 2215 and a negative active material layer 2214, and the positive active material layer 2215 and the negative active material layer 2214 are arranged on both sides of the current collector 2213. By making the electrode sheet 221 include the current collector 2213, the positive active material layer 2215 and the negative active material layer 2214, it is beneficial to make the battery monomer 20 have a higher energy density.

[0244] In some embodiments, the active material layer includes a positive active material layer 2215, the positive active material layer 2215 includes a lithium-containing compound, and the electrolyte salt includes a lithium salt. The positive active material layer 2215 and the electrolyte salt both include lithium ions, which is beneficial to further reduce the internal resistance of the battery monomer 20.

[0245] The embodiments of the present application also provide a battery device 100, which includes the battery monomer 20 described above.

[0246] The application also provides a battery cell 20, which is used to provide electric energy for the electric device.

[0247] According to some embodiments of the application, please refer to Figures 3 to 12 .

[0248] The application provides a battery cell 20, which includes a shell 21 and a solid electrode assembly 22 contained in the shell 21. The outer surface of the solid electrode assembly 22 has an electrolyte residue 23, and the electrolyte residue 23 includes electrolyte salt. The battery cell 20 has the electrolyte residue 23 on the outer surface of the solid electrode assembly 22, and the electrolyte residue 23 includes electrolyte salt. The electrolyte salt can improve ion conductivity and reduce the internal resistance of the battery cell 20.

[0249] The application also provides a battery cell manufacturing method 30, which includes: isostatic pressing a first packaging bag containing a solid electrode assembly 22 and electrolyte; discharging at least part of the electrolyte in the first packaging bag; and re-packaging the solid electrode assembly 22 to form a battery cell 20. In the battery cell manufacturing method 30, the first packaging bag containing the solid electrode assembly 22 and the electrolyte is isostatic pressed. The pressure difference between the inside and outside of the first packaging bag can be kept consistent when the isostatic pressing is performed, because the electrolyte can fill the cavity in the first packaging bag. In this way, the first packaging bag, the solid electrode assembly 22 and the electrolyte are compacted as a whole, which is beneficial to reduce the risk of breaking of the negative electrode sheet 2211 during isostatic pressing, and to realize densification of the solid electrode assembly and improve the reliability and energy density of the battery cell 20. In addition, the battery cell 20 manufactured by the battery cell manufacturing method 30 has the electrolyte residue 23 on the outer surface of the solid electrode assembly 22, and the electrolyte residue 23 includes electrolyte salt. The electrolyte salt can improve ion conductivity and reduce the internal resistance of the battery cell 20.

[0250] After the step of discharging at least part of the electrolyte in the first packaging bag, before the step of re-packaging the solid electrode assembly 22 to form the battery cell 20, the battery cell manufacturing method 30 further includes: drying the solid electrode assembly 22. After discharging at least part of the electrolyte in the first packaging bag, before re-packaging the solid electrode assembly 22, the solid electrode assembly 22 is dried to reduce the residual liquid on the solid electrode assembly 22, which is beneficial to improve the energy density of the battery cell 20.

[0251] The solid-state electrode assembly 22 comprises a positive electrode tab 2212, a solid-state electrolyte layer 222 and a negative electrode tab 2211 which are stacked; after the step of baking the solid-state electrode assembly 22, before the step of re-packaging the solid-state electrode assembly 22 to form the battery cell 20, the battery cell manufacturing method 30 further comprises: welding a positive electrode lug on the positive electrode tab 2212; welding a negative electrode lug on the negative electrode tab 2211. After baking the solid-state electrode assembly 22, welding the positive electrode lug on the positive electrode tab 2212 of the solid-state electrode assembly 22 and welding the negative electrode lug on the negative electrode tab 2211 of the solid-state electrode assembly 22, it is beneficial to reduce the interference of the electrolyte on the welding, and it is beneficial to improve the welding quality.

[0252] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not intended to limit the present application, and for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: shell; Solid-state electrode assembly, housed within the housing; The outer surface of the solid electrode assembly has electrolyte residue, which includes electrolyte salts.

2. The battery cell according to claim 1, characterized in that, The electrolyte residue also includes at least one of sulfides, alcohols, and esters.

3. The battery cell according to claim 1, characterized in that, The electrolyte residue is uniformly distributed on the outer surface of the solid electrode assembly.

4. The battery cell according to any one of claims 1-3, characterized in that, The solid-state electrode assembly includes a solid electrolyte layer and a plurality of electrodes. The solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layers facing the solid electrolyte layer located between the two adjacent electrodes have opposite polarities.

5. The battery cell according to claim 4, characterized in that, The plurality of electrodes include a positive electrode and a negative electrode, wherein the positive electrode, the solid electrolyte layer and the negative electrode are stacked, and the solid electrolyte layer is disposed between the positive electrode and the negative electrode.

6. The battery cell according to claim 4, characterized in that, The electrode includes a current collector, a positive active material layer, and a negative active material layer, with the positive and negative active material layers respectively disposed on both sides of the current collector.

7. The battery cell according to claim 4, characterized in that, The active material layer includes a positive electrode active material layer, which includes a lithium-containing compound, and the electrolyte salt includes a lithium salt.

8. An electrode assembly, characterized in that, The electrode assembly is a solid electrode assembly, and the outer surface of the solid electrode assembly has electrolyte residue, which includes electrolyte salts.

9. The electrode assembly according to claim 8, characterized in that, The electrolyte residue also includes at least one of sulfides, alcohols, and esters.

10. The electrode assembly according to claim 8, characterized in that, The electrolyte residue is uniformly distributed on the outer surface of the solid electrode assembly.

11. The electrode assembly according to any one of claims 8-10, characterized in that, The solid-state electrode assembly includes a solid electrolyte layer and a plurality of electrodes. The solid electrolyte layer is disposed between two adjacent electrodes. Each electrode includes an active material layer. In two adjacent electrodes, the active material layers facing the solid electrolyte layer located between the two adjacent electrodes have opposite polarities.

12. The electrode assembly according to claim 11, characterized in that, The plurality of electrodes include a positive electrode and a negative electrode, wherein the positive electrode, the solid electrolyte layer and the negative electrode are stacked, and the solid electrolyte layer is disposed between the positive electrode and the negative electrode.

13. The electrode assembly according to claim 11, characterized in that, The electrode includes a current collector, a positive active material layer, and a negative active material layer, with the positive and negative active material layers respectively disposed on both sides of the current collector.

14. The electrode assembly according to claim 11, characterized in that, The active material layer includes a positive electrode active material layer, which includes a lithium-containing compound, and the electrolyte salt includes a lithium salt.

15. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-7.

16. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-7, the battery cell being used to provide electrical energy to the electrical device.

Images