Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The single battery comprises an electrode assembly, the electrode assembly comprises a solid electrolyte layer, a first pole piece and a second pole piece, the first pole piece and the second pole piece are opposite in polarity, a first active material layer and two first insulating parts are arranged on one side, facing the second pole piece, of a first current collector of the electrode assembly, and the first active material layer is located between the two first insulating parts in the second direction; a second active material layer and two second insulating parts are arranged on one side, facing the first pole piece, of a second current collector of the electrode assembly, and the second active material layer is located between the two second insulating parts in the third direction. The first insulator protrudes out of the surface, deviating from the first current collector, of the first active material layer; the second insulator protrudes out of the surface of the second active material layer away from the second current collector. According to the battery monomer, the risk of lap joint of the first pole piece and the second pole piece caused by extrusion of the first active material layer and the second active material layer is reduced, and the reliability of the battery monomer is improved.

Description

TECHNICAL FIELD

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

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, unmanned aerial vehicles, energy storage devices and other fields. As the demand for batteries increases, higher reliability requirements are placed on battery monomers. Therefore, how to improve the reliability of battery monomers is a problem to be solved in battery technology. Practical new type content

[0004] The embodiments of the present application provide a battery monomer, a battery device and a power utilization device, which can improve the reliability of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the electrode assembly comprises a first electrode sheet, a solid-state electrolyte layer and a second electrode sheet which are stacked along a first direction, the polarities of the first electrode sheet and the second electrode sheet are opposite, at least part of the solid-state electrolyte layer is arranged between the first electrode sheet and the second electrode sheet along the first direction; the first electrode sheet comprises a first current collector, a first active material layer and a first insulating piece, the side of the first current collector facing the second electrode sheet is provided with the first active material layer and two first insulating pieces, the first active material layer is located between the two first insulating pieces along a second direction; the second electrode sheet comprises a second current collector, a second active material layer and a second insulating piece, the side of the second current collector facing the first electrode sheet is provided with the second active material layer and two second insulating pieces, the second active material layer is located between the two second insulating pieces along a third direction, the first direction, the second direction and the third direction are not coplanar and intersect with each other; wherein, along the direction of the first electrode sheet pointing to the second electrode sheet, the first insulating piece protrudes from the surface of the first active material layer away from the first current collector; along the direction of the second electrode sheet pointing to the first electrode sheet, the second insulating piece protrudes from the surface of the second active material layer away from the second current collector.

[0006] In the technical solution, the first insulating member is arranged on both sides of the first active material layer along the second direction, and protrudes from the surface of the first active material layer away from the first current collector along the direction in which the first pole piece points to the second pole piece, so that the first insulating member can limit the movement of the first active material layer along the second direction, thereby reducing the risk of the first active material layer being extruded along the second direction and lapping with the second pole piece. The second insulating member is arranged on both sides of the second active material layer along the third direction, and protrudes from the surface of the second active material layer away from the second current collector along the direction in which the second pole piece points to the first pole piece, so that the second insulating member can limit the movement of the second active material layer along the third direction, thereby reducing the risk of the second active material layer being extruded along the third direction and lapping with the second pole piece. In this way, the first insulating member and the second insulating member cooperate to limit the position of the first active material layer along the second direction and the position of the second active material layer along the third direction, thereby reducing the risk of the first active material layer and the second active material layer being extruded to cause the first pole piece and the second pole piece to lap, and thus reducing the risk of internal short circuit of the battery monomer and improving the reliability of the battery monomer.

[0007] In some embodiments, a portion of the first insulating member protrudes from the surface of the second active material layer facing the second current collector along the direction in which the first pole piece points to the second pole piece. In this way, the first insulating member and the second insulating member can cooperate to limit the movement of the second active material layer along the second direction and along the third direction, thereby limiting the second active material layer between two adjacent first insulating members along the second direction and between two adjacent second insulating members along the third direction, further reducing the risk of the second active material layer lapping with the first pole piece and improving the reliability of the battery monomer.

[0008] In some embodiments, a portion of the second insulating member protrudes from the surface of the first active material layer facing the first current collector along the direction in which the second pole piece points to the first pole piece. In this way, the first insulating member and the second insulating member can cooperate to limit the movement of the first active material layer along the second direction and along the third direction, thereby limiting the first active material layer between two adjacent first insulating members along the second direction and between two adjacent second insulating members along the third direction, further reducing the risk of the first active material layer lapping with the second pole piece and improving the reliability of the battery monomer.

[0009] In some embodiments, a portion of the first insulating member protrudes from the surface of the second active material layer facing the second current collector along the direction in which the first pole piece points to the second pole piece, and a portion of the second insulating member protrudes from the surface of the first active material layer facing the first current collector along the direction in which the second pole piece points to the first pole piece. In this way, the first insulating member and the second insulating member cooperate to limit the position of the first active material layer and the second active material layer, thereby further reducing the risk of the first active material layer and the second active material layer lapping and improving the reliability of the battery monomer.

[0010] In some embodiments, the thickness of the first insulating member is greater than the sum of the thickness of the first active material layer, the thickness of the solid electrolyte layer, and the thickness of the second active material layer. In this way, the first insulating member can limit the position of the first active material layer, the solid electrolyte layer, and the second active material layer in the second direction, reduce the risk of the first active material layer and the second active material layer overlapping due to overflow in the second direction, and the first insulating member and the second insulating member can limit the movement of the second active material layer in the second direction and in the third direction, respectively, thereby reducing the risk of the second active material layer being extruded and improving the reliability of the battery cell.

[0011] In some embodiments, the thickness of the second insulating member is greater than the sum of the thickness of the second active material layer, the thickness of the solid electrolyte layer, and the thickness of the first active material layer. In this way, the second insulating member can limit the position of the first active material layer, the solid electrolyte layer, and the second active material layer in the third direction, reduce the risk of the first active material layer and the second active material layer overlapping due to overflow in the third direction, and the first insulating member and the second insulating member can limit the movement of the first active material layer in the second direction and in the third direction, respectively, thereby reducing the risk of the first active material layer being extruded and improving the reliability of the battery cell.

[0012] In some embodiments, the thickness of the first insulating member is greater than the sum of the thickness of the first active material layer, the thickness of the solid electrolyte layer, and the thickness of the second active material layer; and the thickness of the second insulating member is greater than the sum of the thickness of the second active material layer, the thickness of the solid electrolyte layer, and the thickness of the first active material layer. In this way, the first insulating member and the second insulating member cooperate to limit the position of the first active material layer and the second active material layer, reduce the risk of the first active material layer and the second active material layer being extruded, thereby reducing the risk of the first active material layer and the second active material layer overlapping, and improving the reliability of the battery cell.

[0013] In some embodiments, there are a plurality of first pole pieces, a second pole piece is arranged between two adjacent first pole pieces, and the first insulating members of the two adjacent first pole pieces abut. By arranging the first insulating members of the two adjacent first pole pieces to abut, the two first insulating members can support the first current collectors of the two adjacent first pole pieces, reducing the risk of the two first current collectors collapsing in the direction of the second pole piece and causing the first pole piece and the second pole piece to overlap.

[0014] In some embodiments, the second pole piece is a plurality, a first pole piece is arranged between two adjacent second pole pieces, and the second insulating pieces of the two adjacent second pole pieces abut. In this way, the two second insulating pieces can support the second current collectors of the two adjacent second pole pieces, reducing the risk of the two second current collectors collapsing in the direction of the first pole piece. The first insulating piece and the second insulating piece support the first current collector and the second current collector, respectively, reducing the risk of the first pole piece and the second pole piece overlapping, and improving the reliability of the battery cell.

[0015] In some embodiments, in a projection plane perpendicular to the first direction, the first insulating piece and the second insulating piece do not overlap in the projection. In this way, the risk of interference between the first insulating piece and the second insulating piece can be reduced, and the assembly difficulty of the electrode assembly can be reduced.

[0016] In some embodiments, the maximum dimension of the first insulating piece along the third direction is L1, the minimum distance between the two second insulating pieces along the third direction is L2, and 0mm≤L2-L1≤2mm. In this way, when the first pole piece and the second pole piece are assembled, the second insulating piece can protrude beyond the two ends of the first insulating piece along the third direction, facilitating the assembly of the second insulating piece and the first insulating piece, and reducing the risk of interference between the first insulating piece and the second insulating piece.

[0017] In some embodiments, the maximum dimension of the second insulating piece along the second direction is L3, the minimum distance between the two first insulating pieces along the second direction is L4, and 0mm≤L4-L3≤2mm. In this way, when the first pole piece and the second pole piece are assembled, the first insulating piece can protrude beyond the two ends of the second insulating piece along the second direction, facilitating the assembly of the first insulating piece and the second insulating piece, and reducing the risk of interference between the first insulating piece and the second insulating piece.

[0018] In some embodiments, the maximum dimension of the first insulating piece along the third direction is L1, the minimum distance between the two second insulating pieces along the third direction is L2, and 0mm≤L2-L1≤2mm; the maximum dimension of the second insulating piece along the second direction is L3, the minimum distance between the two first insulating pieces along the second direction is L4, and 0mm≤L4-L3≤2mm. In this way, the second insulating piece can protrude beyond the two ends of the first insulating piece along the third direction, and the first insulating piece can protrude beyond the two ends of the second insulating piece along the second direction, facilitating the assembly of the first insulating piece and the second insulating piece, and reducing the risk of interference between the first insulating piece and the second insulating piece.

[0019] In some embodiments, along the first direction, the opposite sides of the first current collector are both provided with a first active material layer and a first insulating piece. In this way, the first insulating piece on both sides of the first current collector can limit the position of the first active material layer on the same side along the second direction, thereby reducing the risk of the first active material layer contacting the second pole piece.

[0020] In some embodiments, the second active material layer is arranged on the second current collector, and the second insulating member is arranged on the second active material layer. In this way, the second insulating member can limit the position of the second active material layer on the same side of the second insulating member along the third direction, thereby reducing the risk of the second active material layer contacting the first electrode tab.

[0021] In some embodiments, along the first direction, the first current collector has a first active material layer and a first insulating member arranged on opposite sides of the first current collector; and the second current collector has a second active material layer and a second insulating member arranged on opposite sides of the second current collector. In this way, each first active material layer has a first insulating member limiting the position of the first active material layer along the second direction, and each second active material layer has a second insulating member limiting the position of the second active material layer along the third direction, thereby further reducing the risk of the first active material layer contacting the second active material layer and improving the reliability of the battery cell.

[0022] In some embodiments, along the second direction, at least one end of the first current collector is provided with a first electrode lug, and at least one end of the second current collector is provided with a second electrode lug. By arranging the first electrode lug and the second electrode lug along the second direction, it is convenient to stack the battery cells along the third direction, thereby facilitating the placement of the battery cells and reducing the wiring difficulty of the battery cells.

[0023] In some embodiments, at least one first insulating member is provided with a relief portion for the second electrode lug to pass through. In this way, the risk of interference between the first insulating member and the second electrode lug is reduced, and the difficulty of arranging the second electrode lug is reduced.

[0024] In some embodiments, along the thickness direction of the second electrode lug, at least one surface of the second electrode lug is provided with an insulating layer. By arranging the insulating layer on at least one surface of the second electrode lug, the insulating layer can reduce the risk of the second electrode lug contacting the first current collector, thereby reducing the risk of internal short circuit of the battery cell and improving the reliability of the battery cell.

[0025] In some embodiments, the material of the first insulating member is UV glue, rubber, or resin glue; and the material of the second insulating member is UV glue, rubber, or resin glue.

[0026] In a second aspect, the embodiments of the present application provide a battery device, which comprises the battery cell provided by any one of the embodiments of the first aspect.

[0027] In a third aspect, the embodiments of the present application provide a power consumption device, which comprises the battery cell provided by any one of the embodiments of the first aspect or the battery device provided by any one of the embodiments of the second aspect, and the battery cell is used to provide electric energy to the power consumption device. BRIEF DESCRIPTION OF DRAWINGS

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0030] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0031] Figure 3 Exploded views of a single battery cell provided in some embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0033] Figure 5 Exploded views of electrode assemblies provided in some embodiments of this application;

[0034] Figure 6 for Figure 4 AA section view;

[0035] Figure 7 This application provides schematic diagrams of the structure of electrode assemblies in some of its embodiments.

[0036] Figure 8 Exploded views of electrode assemblies provided in some embodiments of this application;

[0037] Figure 9 for Figure 7 BB section view;

[0038] Figure 10 for Figure 4 CC section view;

[0039] Figure 11 Exploded views of electrode assemblies provided in some embodiments of this application;

[0040] Figure 12 for Figure 7 A magnified view of a portion of region A in the middle.

[0041] Icon: 1 - electrode assembly; 11 - first tab; 111 - first current collector; 112 - first active material layer; 1121 - first surface; 1122 - second surface; 113 - first insulating member; 1131 - first end; 1132 - second end; 1133 - avoiding portion; 12 - solid-state electrolyte layer; 13 - second tab; 131 - second current collector; 132 - second active material layer; 1321 - third surface; 1322 - fourth surface; 133 - second insulating member; 1331 - third end; 1332 - fourth end; 14 - first tab; 15 - second tab; 151 - insulating layer; 2 - case; 21 - case body; 22 - end cap; 3 - electrode terminal; 10 - battery cell; 20 - box; 201 - first box; 202 - second box; 100 - battery device; 200 - controller; 300 - motor; 1000 - vehicle; Z - first direction; X - second direction; Y - third direction. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, 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 but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0043] 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 the 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, and are not intended to describe a particular order or primary and secondary relationship.

[0044] In the present application, the phrase "embodiment" means that the specific features, structures, or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, nor is each necessarily a separate or alternative embodiment to the others.

[0045] The term "and / or" in the present application is merely used to describe an association relationship of associated objects, and indicates that three relationships can exist, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0046] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0047] "Multiple" appearing in the present application means two or more (including two).

[0048] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0049] The battery cell includes but is not limited to a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0050] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0051] 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 arranged on at least one surface of the positive electrode current collector.

[0052] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0053] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. 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, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0054] 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 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 LiFePO4 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material 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 LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), 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 (which can also be referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and a modified compound thereof, or the like.

[0055] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is employed as the positive electrode, the foamed metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or a lithium-rich material.

[0056] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0057] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0058] As an example, the negative electrode tab can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0059] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0060] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode 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 electrode active material for a battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0061] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0062] 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 to separate the positive electrode and the negative electrode.

[0063] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, or a composite solid-state electrolyte.

[0064] 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, or the like.

[0065] 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 phosphorus sulfide, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0066] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0067] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0068] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, or the like.

[0069] The battery apparatus mentioned 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 a busbar component.

[0070] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module.

[0071] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0072] In some embodiments, the battery device can be a battery pack, which can include a case and one or more battery cell assemblies housed in the case.

[0073] As an example, the battery cell assembly can be a battery module, which can be housed in the case by fixing the battery module in the case.

[0074] As an example, the battery cell assembly can also be housed in the case by fixing a plurality of battery cells directly in the case.

[0075] As an example, the case can include a first case and a second case. The first case and the second case are fastened so that an enclosed space is formed inside the case to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0076] As an example, the case 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 case to accommodate the battery cell assembly.

[0077] As an example, the case can be part of a chassis structure of a vehicle. For example, the top cover of the case can be at least part of the floor of the vehicle, or the frame of the case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0078] In some embodiments, the battery device refers to an energy storage device, which includes a case, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0079] For a general battery cell, the battery cell can include a shell and an electrode assembly housed in the shell. The electrode assembly can include a first electrode sheet, a separator, and a second electrode sheet, the first electrode sheet and the second electrode sheet being opposite in polarity, and the separator being arranged between the first electrode sheet and the second electrode sheet to separate the first electrode sheet and the second electrode sheet.

[0080] In a solid-state battery cell, the separator between the first electrode sheet and the second electrode sheet is a solid-state electrolyte layer. During the manufacturing process of the solid-state battery cell, the first electrode sheet, the second electrode sheet, and the solid-state electrolyte layer need to be extruded so that the first electrode sheet and the solid-state electrolyte layer and the second electrode sheet and the solid-state electrolyte layer can be tightly attached. During the extrusion process, the active material of the first electrode sheet and the active material of the second electrode sheet are easily extruded, resulting in the overlap of the two active materials and causing the short circuit of the electrode assembly, which affects the reliability of the battery cell.

[0081] In view of this, the battery cell provided in the embodiments of the present application includes a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the electrode assembly includes a first electrode plate, a solid-state electrolyte layer and a second electrode plate which are stacked along a first direction, the polarities of the first electrode plate and the second electrode plate are opposite, and at least part of the solid-state electrolyte layer is arranged between the first electrode plate and the second electrode plate along the first direction; the first electrode plate includes a first current collector, a first active material layer and two first insulating pieces, the side of the first current collector facing the second electrode plate is provided with the first active material layer and the two first insulating pieces, and the first active material layer is located between the two first insulating pieces along a second direction; the second electrode plate includes a second current collector, a second active material layer and two second insulating pieces, the side of the second current collector facing the first electrode plate is provided with the second active material layer and the two second insulating pieces, and the second active material layer is located between the two second insulating pieces along a third direction, the first direction, the second direction and the third direction are not coplanar and intersect with each other; wherein, along the direction in which the first electrode plate points to the second electrode plate, the first insulating piece protrudes from the surface of the first active material layer away from the first current collector; along the direction in which the second electrode plate points to the first electrode plate, the second insulating piece protrudes from the surface of the second active material layer away from the first current collector.

[0082] In such a battery cell, the first insulating piece and the second insulating piece cooperate to limit the position of the first active material layer along the second direction and limit the position of the second active material layer along the third direction, thereby reducing the risk of the first active material layer and the second active material layer being extruded to cause the first electrode plate and the second electrode plate to be overlapped, thereby reducing the risk of internal short circuit of the battery cell and improving the reliability of the battery cell.

[0083] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0084] 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 an operating power source of the vehicle 1000.

[0085] The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is 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.

[0086] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0087] Please refer to Figure 2 , Figure 2 An exploded view of a battery device 100 is provided for some embodiments of the present application. The battery device 100 can include a box 20 and a battery cell 10, the box 20 is used to accommodate the battery cell 10.

[0088] The box 20 has a closed space formed inside for accommodating the battery cell 10. The box 20 can adopt various structures. In some embodiments, the box 20 can include a first box 201 and a second box 202, the first box 201 and the second box 202 are buckled to each other. The first box 201 and the second box 202 can be various shapes, such as a cuboid, a cylinder, etc. The first box 201 can be a hollow structure with one side open, and the second box 202 can also be a hollow structure with one side open. The open side of the second box 202 and the open side of the first box 201 are buckled to each other to form a box 20 with a closed space. It can also be that the first box 201 is a hollow structure with one side open, and the second box 202 is a plate structure, and the second box 202 is buckled to the open side of the first box 201 to form a box 20 with an accommodation space.

[0089] In the battery device 100, the battery cell 10 can be one or multiple. If the battery cell 10 is multiple, the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that some of the multiple battery cells 10 are connected in series and some are connected in parallel. It can be that multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form a battery module, and multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the box 20. It can also be that all the battery cells 10 are directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 10 is accommodated in the box 20.

[0090] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell 10 is provided for some embodiments of the present application. The battery cell 10 can include an electrode assembly 1 and a case 2, the electrode assembly 1 is accommodated in the case 2.

[0091] In some embodiments, the case 2 can include a shell 21 and an end cover 22, the shell 21 has an opening, and the end cover 22 closes the opening of the shell 21. Here, closing means covering or closing, which can be sealed or unsealed.

[0092] The shell 21 is a hollow structure with one end open, and the shell 21 can be a hollow structure with opposite ends open. The shell 21 can be in various shapes, such as a cylindrical shape, a cuboid shape, etc. The shell 21 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 1 can be partially or entirely located in the shell 21.

[0093] The end cover 22 cooperates with the shell 21 to define a receiving space for accommodating the electrode assembly 1 and other components. The end cover 22 can be connected to the shell 21 by welding, crimping, etc. to close the opening of the shell 21. The shape of the end cover 22 can be adapted to the shape of the shell 21, such as a rectangular plate structure adapted to the cuboid structure of the shell 21, or a circular plate structure adapted to the cylindrical structure of the shell 21. The end cover 22 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The end cover 22 and the shell 21 can be made of the same material or different materials.

[0094] In the embodiment where the shell 21 has one end open, one end cover 22 can be provided. In the embodiment where the shell 21 has opposite ends open, two end covers 22 can be provided, and the two end covers 22 close the two openings of the shell 21, respectively. The two end covers 22 and the shell 21 cooperatively define the receiving space.

[0095] In some embodiments, the battery cell 10 can further include an electrode terminal 3 provided on the shell 2, and the electrode terminal 3 is electrically connected to the tab of the electrode assembly 1 to input or output the electric energy of the battery cell 10. The electrode terminal 3 can be provided on the shell 21 of the shell 2, or on the end cover 22 of the shell 2. The electrode terminal 3 can be directly connected to the tab, such as by welding. The electrode terminal 3 can also be indirectly connected to the tab, such as by a current collecting member. The current collecting member can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0096] Please refer to Figures 4-6 , Figure 4 the structural schematic diagram of the electrode assembly 1 provided by some embodiments of the present application; Figure 5 the exploded view of the electrode assembly 1 provided by some embodiments of the present application; Figure 6 the A-A sectional view of Figure 4 the battery cell 10 provided by some embodiments of the present application includes a shell 2 Figure 3The electrode assembly 1 is accommodated in the housing 2, and includes a first electrode tab 11, a solid-state electrolyte layer 12 and a second electrode tab 13 stacked along a first direction Z, the first electrode tab 11 and the second electrode tab 13 being opposite in polarity, at least part of the solid-state electrolyte layer 12 being disposed between the first electrode tab 11 and the second electrode tab 13 along the first direction Z; the first electrode tab 11 includes a first current collector 111, a first active material layer 112 and two first insulating members 113, the first active material layer 112 and the two first insulating members 113 are disposed on a side of the first current collector 111 facing the second electrode tab 13, the first active material layer 112 is located between the two first insulating members 113 along a second direction X; the second electrode tab 13 includes a second current collector 131, a second active material layer 132 and two second insulating members 133, the second active material layer 132 and the two second insulating members 133 are disposed on a side of the second current collector 131 facing the first electrode tab 11, the second active material layer 132 is located between the two second insulating members 133 along a third direction Y, the first direction Z, the second direction X and the third direction Y are non-coplanar and intersect with each other in pairs; wherein, along a direction in which the first electrode tab 11 points to the second electrode tab 13, the first insulating member 113 protrudes out of a surface of the first active material layer 112 away from the first current collector 111; along a direction in which the second electrode tab 13 points to the first electrode tab 11, the second insulating member 133 protrudes out of a surface of the second active material layer 132 away from the second current collector 131.

[0097] One or more electrode assemblies 1 can be contained in the housing 21. The electrode assembly 1 is mainly formed by stacking a positive electrode tab, a solid-state electrolyte layer 12 and a negative electrode tab. During the charging and discharging process of the battery monomer 10, the positive active material and the negative active material react with the solid-state electrolyte layer 12.

[0098] One of the first electrode tab 11 and the second electrode tab 13 is a positive electrode tab, and the other is a negative electrode tab. For example, the first electrode tab 11 is a positive electrode tab, the second electrode tab 13 is a negative electrode tab, the first active material layer 112 is a negative active material, and the second active material layer 132 is a positive active material. For another example, the first electrode tab 11 is a positive electrode tab, the second electrode tab 13 is a negative electrode tab, the first active material layer 112 is a positive active material, and the second active material layer 132 is a negative active material.

[0099] Only a part of the solid-state electrolyte layer 12 can be disposed between the first electrode tab 11 and the second electrode tab 13; or the entire solid-state electrolyte layer 12 can be disposed between the first electrode tab 11 and the second electrode tab 13.

[0100] The first direction Z is the stacking direction of the first electrode tab 11, the solid-state electrolyte layer 12 and the second electrode tab 13. Any two of the first direction Z, the second direction X and the third direction Y can form an acute angle or a right angle. As an example, in the first direction Z, the second direction X and the third direction Y are perpendicular to each other. Figures 4-6In the illustrated embodiment, the first direction Z, the second direction X and the third direction Y are perpendicular to each other.

[0101] Along the first direction Z, the first current collector 111 can be provided with the second tab 13 on only one side, or the first current collector 111 can be provided with the second tab 13 on both opposite sides. If the first current collector 111 is provided with the second tab 13 on only one side, the first current collector 111 can be provided with the first active material layer 112 on the side facing the second tab 13. If the first current collector 111 is provided with the second tab 13 on both opposite sides, the first current collector 111 can be provided with the first active material layer 112 on the side facing one second tab 13, and the first current collector 111 can be provided with the first active material layer 112 on the side facing the other second tab 13, so as to achieve that the first current collector 111 is provided with the first active material layer 112 on the side facing the second tab 13, and the first current collector 111 is provided with the first active material layer 112 on both opposite sides.

[0102] Along the second direction X, the first active material layer 112 is located between the two first insulating members 113. The first active material layer 112 can be in contact with the two first insulating members 113 at both ends along the second direction X. Alternatively, the first active material layer 112 can be in contact with one first insulating member 113 at one end along the second direction X, and the other end of the first active material layer 112 can be spaced apart from the first insulating member 113. Alternatively, the first active material layer 112 can be spaced apart from the two first insulating members 113 at both ends along the second direction X.

[0103] Along the first direction Z, the second current collector 131 can be provided with the first tab 11 on only one side, or the second current collector 131 can be provided with the first tab 11 on both opposite sides. If the second current collector 131 is provided with the first tab 11 on only one side, the second current collector 131 can be provided with the second active material layer 132 on the side facing the first tab 11. If the second current collector 131 is provided with the first tab 11 on both opposite sides, the second current collector 131 can be provided with the second active material layer 132 on the side facing one first tab 11, and the second current collector 131 can be provided with the second active material layer 132 on the side facing the other first tab 11, so as to achieve that the second current collector 131 is provided with the second active material layer 132 on the side facing the first tab 11, and the second current collector 131 is provided with the second active material layer 132 on both opposite sides.

[0104] The second active material layer 132 is located between two second insulating members 133 along the third direction Y. The two ends of the second active material layer 132 along the third direction Y can be respectively abutted against the two second insulating members 133; or one end of the second active material layer 132 along the third direction Y can be abutted against one second insulating member 133, and the other end of the second active material layer 132 along the third direction Y can be spaced apart from the second insulating member 133; or the two ends of the second active material layer 132 along the third direction Y can be respectively spaced apart from the two second insulating members 133.

[0105] The first insulating member 113 and the first active material layer 112 are both arranged on the same surface of the first current collector 111 along the first direction Z, and the size of the first insulating member 113 along the first direction Z is greater than the size of the first active material layer 112 along the first direction Z, so that a part of the first insulating member 113 can protrude from the surface of the first active material layer 112 away from the first current collector 111. The end of the first insulating member 113 away from the first current collector 111 can be located on both sides of the solid-state electrolyte layer 12 along the second direction X; or the end of the first insulating member 113 away from the first current collector 111 can be located on both sides of the second active material layer 132 along the second direction X; or the end of the first insulating member 113 away from the first current collector 111 can be located on both sides of the second current collector 131 along the second direction X.

[0106] The first active material layer 112 has opposite first and second surfaces 1121 and 1122, the first surface 1121 is arranged to face the first current collector 111, and the second surface 1122 is the surface of the first active material layer 112 away from the first current collector 111, and a part of the first insulating member 113 protrudes from the second surface 1122.

[0107] The second insulating member 133 and the second active material layer 132 are both arranged on the same surface of the second current collector 131 along the first direction Z, and the second insulating member 133 extends along the direction of the second electrode tab 13 pointing to the first electrode tab 11, so that the second insulating member 133 can protrude from the surface of the second active material layer 132 away from the second current collector 131. The second insulating member 133 can extend to the solid-state electrolyte layer 12 along the direction of the second electrode tab 13 pointing to the first electrode tab 11; or the second insulating member 133 can extend to the first active material layer 112 along the direction of the second electrode tab 13 pointing to the first electrode tab 11; or the second insulating member 133 can extend to the first current collector 111 along the direction of the second electrode tab 13 pointing to the first electrode tab 11.

[0108] The second active material layer 132 has opposite third and fourth surfaces 1321 and 1322, the third surface 1321 faces the second current collector 131, and the fourth surface 1322 is a surface of the second active material layer 132 facing away from the second current collector 131, and the second insulating member 133 partially protrudes from the fourth surface 1322.

[0109] In the embodiments, the first insulating member 113 is arranged on both sides of the first active material layer 112 along the second direction X, and protrudes from a surface of the first active material layer 112 facing away from the first current collector 111 in a direction in which the first pole piece 11 points to the second pole piece 13, so that the first insulating member 113 can limit the movement of the first active material layer 112 along the second direction X, thereby reducing the risk of the first active material layer 112 being extruded along the second direction X to be lapped with the second pole piece 13; the second insulating member 133 is arranged on both sides of the second active material layer 132 along the third direction Y, and protrudes from a surface of the second active material layer 132 facing away from the second current collector 131 in a direction in which the second pole piece 13 points to the first pole piece 11, so that the second insulating member 133 can limit the movement of the second active material layer 132 along the third direction Y, thereby reducing the risk of the second active material layer 132 being extruded along the third direction Y to be lapped with the second pole piece 13; in this way, the first insulating member 113 and the second insulating member 133 cooperate to reduce the risk of the first pole piece 11 and the second pole piece 13 being lapped, thereby reducing the risk of internal short circuit of the battery monomer 10 and improving the reliability of the battery monomer 10.

[0110] In some embodiments, please continue to refer to Figures 4-6 In the direction in which the first pole piece 11 points to the second pole piece 13, a portion of the first insulating member 113 protrudes from a surface of the second active material layer 132 facing the second current collector 131.

[0111] The third surface 1321 faces the second current collector 131, and a portion of the first insulating member 113 protrudes from the third surface 1321 in the direction in which the first pole piece 11 points to the second pole piece 13.

[0112] A portion of the first insulating member 113 protrudes from a surface of the second active material layer 132 facing the second current collector 131, so that the first insulating member 113 protrudes from the first active material layer 112, the solid-state electrolyte layer 12 and the second active material layer 132 in the direction in which the first pole piece 11 points to the second pole piece 13. The first insulating member 113 can limit the position of the first active material layer 112, the solid-state electrolyte layer 12 and the second active material layer 132 along the second direction X.

[0113] A portion of the first insulating member 113 is located at one end of the second active material layer 132 in the second direction X, and a portion of the second insulating member 133 is located at one end of the second active material layer 132 in the third direction Y, and the first insulating member 113 and the second insulating member 133 can limit the position of the second active material layer 132 in the second direction X and in the third direction Y.

[0114] In this embodiment, the first insulating member 113 and the second insulating member 133 can cooperate to limit the movement of the second active material layer 132 in the second direction X and in the third direction Y, thereby limiting the second active material layer 132 between two first insulating members 113 adjacent in the second direction X and between two second insulating members 133 adjacent in the third direction Y, further reducing the risk of the second active material layer 132 overlapping the first tab 11, and improving the reliability of the battery monomer 10.

[0115] In some embodiments, a portion of the second insulating member 133 protrudes from the surface of the first active material layer 112 facing the first current collector 111 in the direction of the second tab 13 pointing to the first tab 11.

[0116] The first surface 1121 is provided facing the first current collector 111, and a portion of the second insulating member 133 protrudes from the first surface 1121 in the direction of the second tab 13 pointing to the first tab 11.

[0117] The second insulating member 133 protrudes from the surface of the first active material layer 112 facing the first current collector 111, so that the second insulating member 133 protrudes from the second active material layer 132, the solid-state electrolyte layer 12 and the first active material layer 112 in the direction of the second tab 13 pointing to the first tab 11, and the second insulating member 133 can limit the position of the second active material layer 132, the solid-state electrolyte layer 12 and the first active material layer 112 in the third direction Y.

[0118] A portion of the second insulating member 133 is located at one end of the first active material layer 112 in the third direction Y, and a portion of the first insulating member 113 is located at one end of the first active material layer 112 in the second direction X, and the first insulating member 113 and the second insulating member 133 can limit the position of the first active material layer 112 in the second direction X and in the third direction Y.

[0119] In this embodiment, the first insulating member 113 and the second insulating member 133 can cooperate to limit the movement of the first active material layer 112 in the second direction X and in the third direction Y, thereby limiting the first active material layer 112 between two first insulating members 113 adjacent in the second direction X and between two second insulating members 133 adjacent in the third direction Y, further reducing the risk of the first active material layer 112 overlapping the second tab 13, and improving the reliability of the battery monomer 10.

[0120] In some embodiments, a portion of the first insulating member 113 protrudes from a surface of the second current collector 131 facing the second active material layer 132 in a direction of the first tab 11 pointing to the second tab 13; a portion of the second insulating member 133 protrudes from a surface of the first current collector 111 facing the first active material layer 112 in a direction of the second tab 13 pointing to the first tab 11.

[0121] A portion of the first insulating member 113 protrudes from the third surface 1321 in a direction of the first tab 11 pointing to the second tab 13, and a portion of the second insulating member 133 protrudes from the first surface 1121 in a direction of the second tab 13 pointing to the first tab 11. The two first insulating members 113 and the two second insulating members 133 form a ring structure to enclose the first active material layer 112, the solid-state electrolyte layer 12, and the second active material layer 132.

[0122] In the present embodiment, the first insulating member 113 and the second insulating member 133 cooperate to limit the position of the first active material layer 112 and the second active material layer 132, thereby further reducing the risk of the first active material layer 112 and the second active material layer 132 overlapping and improving the reliability of the battery cell 10.

[0123] In some embodiments, the thickness of the first insulating member 113 is greater than the sum of the thickness of the first active material layer 112, the thickness of the solid-state electrolyte layer 12, and the thickness of the second active material layer 132.

[0124] The thickness of the first insulating member 113 is the dimension of the first insulating member 113 along the first direction Z. The sum of the thickness of the first active material layer 112, the thickness of the solid-state electrolyte layer 12, and the thickness of the second active material layer 132 is the total dimension of the first active material layer 112, the solid-state electrolyte layer 12, and the second active material layer 132 after being stacked.

[0125] The first insulating member 113 protrudes from the third surface 1321 in a direction of the first tab 11 pointing to the second tab 13, so that the thickness of the first insulating member 113 is greater than the sum of the thickness of the first active material layer 112, the thickness of the solid-state electrolyte layer 12, and the thickness of the second active material layer 132.

[0126] In the present embodiment, the first insulating member 113 can restrict the positions of the first active material layer 112, the solid-state electrolyte layer 12, and the second active material layer 132 in the second direction X, reduce the risk of the first active material layer 112 and the second active material layer 132 overflowing and being overlapped in the second direction X, and the first insulating member 113 and the second insulating member 133 can respectively restrict the movement of the second active material layer 132 in the second direction X and in the third direction Y, thereby reducing the risk of the second active material layer 132 being extruded and improving the reliability of the battery cell 10.

[0127] In some embodiments, the thickness of the second insulating member 133 is greater than the sum of the thickness of the second active material layer 132, the thickness of the solid-state electrolyte layer 12, and the thickness of the first active material layer 112.

[0128] The thickness of the second insulating member 133 is the dimension of the second insulating member 133 in the first direction Z. The sum of the thickness of the second active material layer 132, the thickness of the solid-state electrolyte layer 12, and the thickness of the first active material layer 112 is the total dimension of the second active material layer 132, the solid-state electrolyte layer 12, and the first active material layer 112 after being stacked in the first direction Z.

[0129] The second insulating member 133 protrudes from the first surface 1121 in the direction in which the second tab 13 points to the first tab 11, so that the thickness of the first insulating member 113 is greater than the sum of the thickness of the first active material layer 112, the thickness of the solid-state electrolyte layer 12, and the thickness of the second active material layer 132.

[0130] In the present embodiment, the second insulating member 133 can restrict the positions of the first active material layer 112, the solid-state electrolyte layer 12, and the second active material layer 132 in the third direction Y, reduce the risk of the first active material layer 112 and the second active material layer 132 overflowing and being overlapped in the third direction Y, and the first insulating member 113 and the second insulating member 133 can respectively restrict the movement of the first active material layer 112 in the second direction X and in the third direction Y, thereby reducing the risk of the first active material layer 112 being extruded and improving the reliability of the battery cell 10.

[0131] In some embodiments, the thickness of the first insulating member 113 is greater than the sum of the thickness of the first active material layer 112, the thickness of the solid-state electrolyte layer 12, and the thickness of the second active material layer 132; and the thickness of the second insulating member 133 is greater than the sum of the thickness of the second active material layer 132, the thickness of the solid-state electrolyte layer 12, and the thickness of the first active material layer 112.

[0132] The first insulating member 113 protrudes the third surface 1321 in a direction of the second tab 13 from the first tab 11, so that the thickness of the first insulating member 113 is greater than the sum of the thickness of the first active material layer 112, the thickness of the solid electrolyte layer 12 and the thickness of the second active material layer 132; and the second insulating member 133 protrudes the first surface 1121 in a direction of the first tab 11 from the second tab 13, so that the thickness of the first insulating member 113 is greater than the sum of the thickness of the first active material layer 112, the thickness of the solid electrolyte layer 12 and the thickness of the second active material layer 132. The first current collector 111, the second current collector 131, the two first insulating members 113 and the two second insulating members 133 form a containing space, and the first active material layer 112, the solid electrolyte layer 12 and the second active material layer 132 are all contained in the containing space.

[0133] In the embodiment, the first insulating member 113 and the second insulating member 133 cooperate to limit the positions of the first active material layer 112 and the second active material layer 132, reduce the risk of extrusion of the first active material layer 112 and the second active material layer 132, thereby reducing the risk of overlap of the first active material layer 112 and the second active material layer 132, and improving the reliability of the battery monomer 10.

[0134] In some embodiments, please refer to Figures 7-9 , Figure 7 a structural schematic diagram of an electrode assembly 1 provided in yet some embodiments of the present application; Figure 8 an exploded view of the electrode assembly 1 provided in yet some embodiments of the present application;

[0135] Figure 9 for Figure 7 a B-B cross-sectional view in FIG. 1. There are multiple first tabs 11, and a second tab 13 is arranged between two adjacent first tabs 11, and the first insulating members 113 of the two adjacent first tabs 11 abut.

[0136] In two first tabs 11 adjacent in the first direction Z, the surfaces of the two first tabs 11 facing the same second tab 13 are both provided with two first insulating members 113, and the two first insulating members 113 of each first tab 11 are oppositely arranged in the second direction X and located on both sides of the first active material layer 112. The first insulating member 113 has a first end 1131 and a second end 1132 opposite in the first direction Z, the first end 1131 is connected to the first current collector 111, and the second ends 1132 of the two first insulating members 113 abut; wherein the first end 1131 can be bonded to the first current collector 111.

[0137] By setting the first insulating pieces 113 of the two adjacent first pole pieces 11 abutting, the two first insulating pieces 113 can support the first current collectors 111 of the two adjacent first pole pieces 11, reducing the risk of the two first current collectors 111 collapsing in the direction of the second pole piece 13, causing the first pole piece 11 and the second pole piece 13 to overlap.

[0138] In some embodiments, the second pole piece 13 is a plurality, and a first pole piece 11 is arranged between two adjacent second pole pieces 13, and the second insulating pieces 133 of the two adjacent second pole pieces 13 abut.

[0139] Among the two second pole pieces 13 adjacent in the first direction Z, the surfaces of the two second pole pieces 13 facing the same first pole piece 11 are each provided with two second insulating pieces 133, and the two second insulating pieces 133 of each second pole piece 13 are oppositely arranged along the third direction Y and located on both sides of the second active material layer 132. The second insulating piece 133 has a third end 1331 and a fourth end 1332 opposite in the first direction Z, the third end 1331 is connected to the second current collector 131, and the fourth ends 1332 of the two second insulating pieces 133 abut; wherein the third end 1331 can be bonded to the second current collector 131.

[0140] In this embodiment, the two second insulating pieces 133 can support the second current collectors 131 of the two adjacent second pole pieces 13, reducing the risk of the two second current collectors 131 collapsing in the direction of the first pole piece 11. The first insulating piece 113 and the second insulating piece 133 support the first current collector 111 and the second current collector 131 respectively, reducing the risk of the first pole piece 11 and the second pole piece 13 overlapping, and improving the reliability of the battery monomer 10.

[0141] In some embodiments, in a projection plane perpendicular to the first direction Z, the orthographic projection of the first insulating piece 113 does not overlap with the orthographic projection of the second insulating piece 133.

[0142] In the projection plane perpendicular to the first direction Z, the edge of the orthographic projection of the first insulating piece 113 can be in contact with the edge of the orthographic projection of the second insulating piece 133; or the orthographic projection of the first insulating piece 113 and the orthographic projection of the second insulating piece 133 can be distributed in intervals.

[0143] In this embodiment, by setting the orthographic projection of the first insulating piece 113 and the orthographic projection of the second insulating piece 133 not overlapping in the projection plane perpendicular to the first direction Z, the risk of interference between the first insulating piece 113 and the second insulating piece 133 can be reduced, and the assembly difficulty of the electrode assembly 1 can be reduced.

[0144] In some embodiments, please refer to Figure 10 , Figure 10 to Figure 4A C-C cross-sectional view of the first insulating member 113 and the second insulating member 133. The maximum dimension of the first insulating member 113 along the third direction Y is L1, and the minimum distance of the two second insulating members 133 along the third direction Y is L2, 0 mm ≤ L2 - L1 ≤ 2 mm.

[0145] When L2 - L1 is equal to 0 mm, the dimension of the first insulating member 113 along the third direction Y is equal to the minimum distance of the two second insulating members 133 along the third direction Y. The two ends of the first insulating member 113 along the third direction Y can be in contact with the two second insulating members 133 to surround the solid electrolyte layer 12. When 0 mm < L2 - L1 ≤ 2 mm, the dimension of the first insulating member 113 along the third direction Y is smaller than the minimum distance of the two second insulating members 133 along the third direction Y. The two ends of the first insulating member 113 along the third direction Y can not be in contact with the two second insulating members 133.

[0146] L2 - L1 can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, or a range value between any two of them.

[0147] In the present embodiment, when the first electrode tab 11 and the second electrode tab 13 are assembled, the second insulating member 133 can protrude beyond the two ends of the first insulating member 113 along the third direction Y, facilitating the assembly of the second insulating member 133 and the first insulating member 113, and reducing the risk of interference between the first insulating member 113 and the second insulating member 133.

[0148] In some embodiments, the maximum dimension of the first insulating member 113 along the third direction Y is the maximum dimension of the first current collector 111 along the third direction Y.

[0149] In some embodiments, please continue to refer to Figure 10 The maximum dimension of the second insulating member 133 along the second direction X is L3, and the minimum distance of the two first insulating members 113 along the second direction X is L4, 0 mm ≤ L4 - L3 ≤ 2 mm.

[0150] When L4 - L3 is equal to 0 mm, the dimension of the second insulating member 133 along the second direction X is equal to the minimum distance of the two first insulating members 113 along the second direction X. The two ends of the second insulating member 133 along the third direction Y can be in contact with the two first insulating members 113 to surround the solid electrolyte layer 12. When 0 mm < L4 - L3 ≤ 2 mm, the dimension of the second insulating member 133 along the second direction X is smaller than the minimum distance of the two first insulating members 113 along the second direction X. The two ends of the second insulating member 133 along the second direction X can not be in contact with the two first insulating members 113.

[0151] L4-L3 can be any one of 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm or a range value between any two of them.

[0152] In the embodiment, when the first pole piece 11 and the second pole piece 13 are assembled, the first insulating piece 113 can protrude beyond the two ends of the second insulating piece 133 along the second direction X, facilitating the assembly of the first insulating piece 113 and the second insulating piece 133 and reducing the risk of interference between the first insulating piece 113 and the second insulating piece 133.

[0153] In some embodiments, the maximum dimension of the first insulating piece 113 along the third direction Y is L1, the minimum distance between the two second insulating pieces 133 along the third direction Y is L2, and 0mm≤L2-L1≤2mm; the maximum dimension of the second insulating piece 133 along the second direction X is L3, the minimum distance between the two first insulating pieces 113 along the second direction X is L4, and 0mm≤L4-L3≤2mm.

[0154] For example, as shown in Figure 10 L1=L2, L3=L4, and the two first insulating pieces 113 and the two second insulating pieces 133 abut to form a ring structure.

[0155] In the embodiment, the second insulating piece 133 can protrude beyond the two ends of the first insulating piece 113 along the third direction Y, and the first insulating piece 113 can protrude beyond the two ends of the second insulating piece 133 along the second direction X, facilitating the assembly of the first insulating piece 113 and the second insulating piece 133 and reducing the risk of interference between the first insulating piece 113 and the second insulating piece 133.

[0156] In some embodiments, please refer to Figure 11 , Figure 11 An exploded view of the electrode assembly provided in some embodiments of the application is shown. Along the first direction Z, the first current collector 111 is provided with the first active material layer 112 and the first insulating piece 113 on opposite sides.

[0157] One side of a first active material layer 112 facing the second pole piece 13 is provided with a solid-state electrolyte layer 12, and the other side of the first active material layer 112 away from the first current collector 111 can be provided with a solid-state electrolyte layer 12 or can not be provided with a solid-state electrolyte layer 12.

[0158] In the present embodiment, the first insulating member 113 on each side of the first current collector 111 can limit the position of the first active material layer 112 on the same side thereof along the second direction X, thereby reducing the risk of the first active material layer 112 contacting the second tab 13.

[0159] In some embodiments, the second current collector 131 has a second active material layer 132 and a second insulating member 133 on each side thereof.

[0160] One side of a second active material layer 132 facing the first tab 11 is provided with a solid-state electrolyte layer 12, and the other side of the second active material layer 132 away from the second current collector 131 can or can not be provided with a solid-state electrolyte layer 12.

[0161] In the present embodiment, the second insulating member 133 on each side of the second current collector 131 can limit the position of the second active material layer 132 on the same side thereof along the third direction Y, thereby reducing the risk of the second active material layer 132 contacting the first tab 11.

[0162] In some embodiments, along the first direction Z, the first current collector 111 has a first active material layer 112 and a first insulating member 113 on each side thereof; and the second current collector 131 has a second active material layer 132 and a second insulating member 133 on each side thereof.

[0163] In the present embodiment, each first active material layer 112 has a first insulating member 113 limiting the position thereof along the second direction X, and each second active material layer 132 has a second insulating member 133 limiting the position thereof along the third direction Y, thereby further reducing the risk of the first active material layer 112 contacting the second active material layer 132 and improving the reliability of the battery cell 10.

[0164] In some embodiments, please continue to refer to Figure 4 and Figure 5 . Along the second direction X, at least one end of the first current collector 111 is provided with a first tab 14, and at least one end of the second current collector 131 is provided with a second tab 15.

[0165] The first current collector 111 can have the first tab 14 on only one end thereof along the second direction X; or the first current collector 111 can have the first tab 14 on both ends thereof along the second direction X. The second current collector 131 can have the second tab 15 on only one end thereof along the second direction X; or the second current collector 131 can have the second tab 15 on both ends thereof along the second direction X. The first tab 14 and the second tab 15 can be located on the same side of the electrode assembly 1, or on opposite sides of the electrode assembly 1 along the second direction X.

[0166] In the embodiment, by arranging the first tab 14 and the second tab 15 along the second direction X, the battery monomer 10 is facilitated to be stacked along the third direction Y, and the wiring difficulty of the battery monomer 10 is reduced.

[0167] In some embodiments, please continue to refer to Figure 4 and Figure 5 . The at least one first insulating piece 113 is provided with a avoiding part 1133 for the second tab 15 to pass through.

[0168] When the second tab 15 is one, the first insulating piece 113 on the same side of the second tab 15 can be provided with the avoiding part 1133, or the two first insulating pieces 113 on the same side of the second tab 15 can be provided with the avoiding part 1133. When the second tab 15 is multiple, the multiple second tabs 15 are located on both sides of the second current collector 131 along the second direction X, the four first insulating pieces 113 located on both sides of the first active material layer 112 along the second direction X can be provided with the avoiding part 1133, or the first insulating piece 113 located on one side of the first active material layer 112 along the second direction X is provided with the avoiding part 1133, and the first insulating piece 113 located on the other side of the first active material layer 112 along the second direction X is provided with the avoiding part 1133.

[0169] The avoiding part 1133 can be a hole opened on the first insulating piece 113, or a groove located at one end of the first insulating piece 113 away from the first current collector 111.

[0170] In the embodiment, the at least one first insulating piece 113 is provided with the avoiding part 1133 for the second tab 15 to pass through, which can reduce the risk of interference between the first insulating piece 113 and the second tab 15, and reduce the difficulty of setting the second tab 15.

[0171] In some embodiments, please refer to Figure 12 , Figure 12 Figure 7 is a partial enlarged view of the A area in FIG. 13. Along the thickness direction of the second tab 15, at least one surface of the second tab 15 is provided with an insulating layer 151.

[0172] The first tab 14 can be provided with the insulating layer 151 on both sides along the thickness direction, or the first tab 14 can be provided with the insulating layer 151 on only one side along the thickness direction.

[0173] The second tab 15 extends out of the first insulating piece 113 along the second direction X, the first current collector 111 is arranged between the two adjacent first insulating pieces 113, and the insulating layer 151 is arranged on the surface in the thickness direction of the second tab 15, which can reduce the risk of the second tab 15 contacting the first current collector 111. ​

[0174] By arranging the insulating layer 151 on at least one surface of the second tab 15, the insulating layer 151 can reduce the risk of the second tab 15 contacting the first current collector 111, thereby reducing the risk of internal short in the battery monomer 10 and improving the reliability of the battery monomer 10.

[0175] In some embodiments, the material of the first insulating member 113 is UV glue, rubber or resin glue. The UV glue is an adhesive that can be cured by ultraviolet light irradiation.

[0176] In some embodiments, the material of the second insulating member 133 is UV glue, rubber or resin glue.

[0177] The embodiments of the present application provide a battery device 100, which comprises the battery monomer 10 provided by any one of the above embodiments.

[0178] The embodiments of the present application provide a power consumption device, which comprises the battery monomer 10 provided by any one of the above embodiments or the battery device 100 provided by any one of the above embodiments, and the battery monomer 10 is used to provide electric energy for the power consumption device.

[0179] Please continue to refer to Figures 7-9The embodiment of the present application provides a battery monomer 10, which comprises a shell 2 and an electrode assembly 1, the electrode assembly 1 is contained in the shell 2, the electrode assembly 1 comprises a plurality of first pole pieces 11, a solid-state electrolyte layer 12 and a plurality of second pole pieces 13 which are stacked along a first direction Z, the polarities of the first pole pieces 11 and the second pole pieces 13 are opposite, and the solid-state electrolyte layer 12 is arranged between the first pole pieces 11 and the second pole pieces 13 along the first direction Z. The first pole piece 11 comprises a first current collector 111, a first active material layer 112 and a first insulating piece 113, the side of the first current collector 111 facing the second pole piece 13 is provided with the first active material layer 112 and two first insulating pieces 113, and the first active material layer 112 is located between the two first insulating pieces 113 along a second direction X. The second pole piece 13 comprises a second current collector 131, a second active material layer 132 and a second insulating piece 133, the side of the second current collector 131 facing the first pole piece 11 is provided with the second active material layer 132 and two second insulating pieces 133, and the second active material layer 132 is located between the two second insulating pieces 133 along a third direction Y, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other. Wherein, along the direction in which the first pole piece 11 points to the second pole piece 13, the first insulating piece 113 protrudes from the surface of the first active material layer 112 away from the first current collector 111. Along the direction in which the second pole piece 13 points to the first pole piece 11, the second insulating piece 133 protrudes from the surface of the second active material layer 132 away from the second current collector 131. The second pole piece 13 is arranged between two adjacent first pole pieces 11, and the first insulating pieces 113 of the two adjacent first pole pieces 11 abut. The first pole piece 11 is arranged between two adjacent second pole pieces 13, and the second insulating pieces 133 of the two adjacent second pole pieces 13 abut. In a projection plane perpendicular to the first direction Z, the orthographic projection of the first insulating piece 113 does not overlap with the orthographic projection of the second insulating piece 133. Along the second direction X, one end of the first current collector 111 is provided with a first pole lug 14, and one end of the second current collector 131 is provided with a second pole lug 15. The two first insulating pieces 113 abutting each other are both provided with a avoiding part 1133 for the second pole lug 15 to pass through.

[0180] In the embodiment, the first insulating member 113 is arranged on both sides of the first active material layer 112 along the second direction X, and protrudes from the surface of the first active material layer 112 away from the first current collector 111 in the direction in which the first tab 11 points to the second tab 13, so that the first insulating member 113 can limit the movement of the first active material layer 112 along the second direction X, thereby reducing the risk of the first active material layer 112 being extruded along the second direction X to be lapped with the second tab 13; the second insulating member 133 is arranged on both sides of the second active material layer 132 along the third direction Y, and protrudes from the surface of the second active material layer 132 away from the second current collector 131 in the direction in which the second tab 13 points to the first tab 11, so that the second insulating member 133 can limit the movement of the second active material layer 132 along the third direction Y, thereby reducing the risk of the second active material layer 132 being extruded along the third direction Y to be lapped with the second tab 13; in this way, the first insulating member 113 and the second insulating member 133 cooperate to limit the position of the first active material layer 112 along the second direction X and the position of the second active material layer 132 along the third direction Y, thereby reducing the risk of the first active material layer 112 and the second active material layer 132 being extruded to cause the first tab 11 and the second tab 13 to be lapped, thereby reducing the risk of internal short circuit of the battery monomer 10 and improving the reliability of the battery monomer 10. The first insulating members 113 of the two adjacent first tabs 11 abut each other, and the two first insulating members 113 can support the first current collectors 111 of the two adjacent first tabs 11, thereby reducing the risk of the two first current collectors 111 collapsing in the direction of the second tab 13 to cause the first tab 11 and the second tab 13 to be lapped. The two second insulating members 133 can support the second current collectors 131 of the two adjacent second tabs 13, thereby reducing the risk of the two second current collectors 131 collapsing in the direction of the first tab 11. The first insulating member 113 and the second insulating member 133 support the first current collector 111 and the second current collector 131 respectively, thereby reducing the risk of the first tab 11 and the second tab 13 being lapped and improving the reliability of the battery monomer 10. In the projection plane perpendicular to the first direction Z, the orthographic projection of the first insulating member 113 does not overlap with the orthographic projection of the second insulating member 133, thereby reducing the risk of interference between the first insulating member 113 and the second insulating member 133 and reducing the assembly difficulty of the electrode assembly 1. The two abutting first insulating members 113 are each provided with a avoiding portion 1133 through which the second tab 15 passes, thereby reducing the risk of interference between the first insulating member 113 and the second tab 15 and reducing the setting difficulty of the second tab 15.

[0181] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0182] The above examples are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. 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 by, The application relates to a battery, comprising: a housing; an electrode assembly accommodated in the housing, the electrode assembly comprising a first electrode plate, a solid-state electrolyte layer and a second electrode plate stacked in a first direction, the first electrode plate and the second electrode plate being opposite in polarity, and at least part of the solid-state electrolyte layer being arranged between the first electrode plate and the second electrode plate along the first direction; the first electrode plate comprising a first current collector, a first active material layer and two first insulating pieces, the first current collector being provided with the first active material layer and the two first insulating pieces on one side facing the second electrode plate, and the first active material layer being located between the two first insulating pieces along a second direction; the second electrode plate comprising a second current collector, a second active material layer and two second insulating pieces, the second current collector being provided with the second active material layer and the two second insulating pieces on one side facing the first electrode plate, and the second active material layer being located between the two second insulating pieces along a third direction, the first direction, the second direction and the third direction being non-coplanar and intersecting with each other; wherein, along a direction in which the first electrode plate points to the second electrode plate, the first insulating piece protrudes from a surface of the first active material layer away from the first current collector; along a direction in which the second electrode plate points to the first electrode plate, the second insulating piece protrudes from a surface of the second active material layer away from the second current collector.

2. The battery cell of claim 1, wherein, along the direction in which the first electrode plate points to the second electrode plate, a part of the first insulating piece protrudes from a surface of the second active material layer facing the second current collector; and / or, along the direction in which the second electrode plate points to the first electrode plate, a part of the second insulating piece protrudes from a surface of the first active material layer facing the first current collector.

3. The battery cell of claim 1, wherein, a thickness of the first insulating piece is greater than a sum of a thickness of the first active material layer, a thickness of the solid-state electrolyte layer and a thickness of the second active material layer; and / or, a thickness of the second insulating piece is greater than a sum of the thickness of the second active material layer, the thickness of the solid-state electrolyte layer and the thickness of the first active material layer.

4. The battery cell of claim 1, wherein, a plurality of the first electrode plates are provided, the second electrode plate is arranged between two adjacent first electrode plates, and the first insulating pieces of the two adjacent first electrode plates abut each other.

5. The battery cell of claim 4, wherein the cathode comprises a lithium metal oxide. a plurality of the second electrode plates are provided, the first electrode plate is arranged between two adjacent second electrode plates, and the second insulating pieces of the two adjacent second electrode plates abut each other.

6. The battery cell of claim 1, wherein, in a projection plane perpendicular to the first direction, a projection of the first insulating piece and a projection of the second insulating piece do not overlap.

7. The battery cell of claim 1, wherein the cathode comprises a lithium metal oxide. a maximum dimension of the first insulating piece along the third direction is L1, a minimum distance between two second insulating pieces along the third direction is L2, and 0mm<=L2-L1<=2mm; and / or, a maximum dimension of the second insulating piece along the second direction is L3, a minimum distance between two first insulating pieces along the second direction is L4, and 0mm<=L4-L3<=2mm.

8. The battery cell of claim 1, wherein, In the first direction, opposite sides of the first current collector are provided with the first active material layer and the first insulating member; and / or, opposite sides of the second current collector are provided with the second active material layer and the second insulating member.

9. The battery cell of any one of claims 1-8, wherein, In the second direction, at least one end of the first current collector is provided with a first tab, and at least one end of the second current collector is provided with a second tab.

10. The battery cell of claim 9, wherein the cathode comprises a lithium metal oxide. At least one of the first insulating members is provided with a recess for the second tab to pass through.

11. The battery cell as described in claim 9, characterized in that, In the thickness direction of the second tab, at least one surface of the second tab is provided with an insulating layer.

12. The battery cell of any one of claims 1-8, wherein, The first insulating member is made of UV glue, rubber or resin glue; and / or, the second insulating member is made of UV glue, rubber or resin glue.

13. A battery device characterized by comprising: The battery cell as claimed in any one of claims 1-12.

14. An electrical device, comprising: The battery cell as claimed in any one of claims 1-12 or the battery device as claimed in claim 13, wherein the battery cell is used to provide electric energy for the electric device.

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