Battery and electric device

Abstract

The invention provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a box body, a solid-state battery cell and insulating liquid, an assembling space is formed in the box body. The solid-state battery cell is arranged in the assembly space, the solid-state battery cell comprises a first pole piece, a solid-state electrolyte layer and a second pole piece, the polarity of the first pole piece is opposite to that of the second pole piece, and the solid-state electrolyte layer is arranged between the first pole piece and the second pole piece so as to separate the first pole piece from the second pole piece. The insulating liquid is contained in the assembly space, and the solid-state battery cell is immersed in the insulating liquid. According to the battery with the structure, the pressurizing effect on the solid-state battery cell can be improved, so that the phenomenon that the contact area between the first pole piece and the solid-state electrolyte layer and the contact area between the second pole piece and the solid-state electrolyte layer of the solid-state battery cell are reduced or the contact effect is poor can be effectively relieved in the use process; therefore, the phenomena of different electric conductivity and fluctuation at different positions of the solid-state battery cell are relieved.

Description

TECHNICAL FIELD

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

[0002] In recent years, new energy vehicles have made a great leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, the battery as a core component of new energy vehicles has higher requirements in terms of use stability and service life.

[0003] In the battery technology, in order to improve the energy density and charging speed of the battery, the battery is usually set as a solid-state battery, that is, the battery includes a box body and a solid-state battery cell contained in the box body. However, the existing solid-state battery cell is prone to performance degradation or failure during use, and even internal short circuit and other risks may occur, resulting in low use reliability and short service life of the battery. SUMMARY

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

[0005] In a first aspect, the embodiments of the present application provide a battery, which includes a box body, a solid-state battery cell and an insulating liquid. An assembly space is formed in the interior of the box body. The solid-state battery cell is arranged in the assembly space. The solid-state battery cell includes a first electrode sheet, a solid-state electrolyte layer and a second electrode sheet. The polarities of the first electrode sheet and the second electrode sheet are opposite. The solid-state electrolyte layer is arranged between the first electrode sheet and the second electrode sheet to separate the first electrode sheet and the second electrode sheet. The insulating liquid is contained in the assembly space. The solid-state battery cell is immersed in the insulating liquid.

[0006] In the above technical solution, by arranging the insulating liquid in the assembly space of the box body, and the solid-state cell contained in the assembly space is immersed in the insulating liquid, so that the insulating liquid can be wrapped on the outside of the solid-state cell and externally pressurize the solid-state cell, so as to improve the contact area and contact effect between the first pole piece and the solid-state electrolyte layer and between the second pole piece and the solid-state electrolyte layer. The battery with this structure can pressurize the solid-state cell from multiple directions on the one hand, which is beneficial to improve the contact area and contact effect between the first pole piece and the solid-state electrolyte layer and between the second pole piece and the solid-state electrolyte layer at any position. On the other hand, the external pressure received by the solid-state cell will not be affected by the shrinkage and expansion of the solid-state cell, so that the insulating liquid can still pressurize the solid-state cell when the solid-state cell shrinks and expands during use, so that the external pressure received by the solid-state cell can remain constant. Thus, the phenomenon of reduced contact area or poor contact effect between the first pole piece and the solid-state electrolyte layer and between the second pole piece and the solid-state electrolyte layer of the solid-state cell during use can be effectively alleviated, so as to alleviate the phenomenon of different conductivity at different positions of the solid-state cell and fluctuation, etc. Thus, the risk of internal short circuit caused by deposition of ion metal and breakthrough of the solid-state electrolyte layer of the solid-state cell can be effectively reduced, and the risk of performance degradation or even failure of the solid-state cell during use can be effectively reduced, which is beneficial to improve the use reliability and service life of the battery. In addition, by arranging the solid-state cell to be immersed in the insulating liquid, the insulating liquid can also exchange heat with the solid-state cell, so that the insulating liquid can play a certain heat management role on the solid-state cell, which is beneficial to alleviate the phenomenon of excessively high or low temperature of the solid-state cell during use.

[0007] In some embodiments, the solid-state cell is in a cylindrical shape, and along the radial direction of the solid-state cell, at least part of the solid-state electrolyte layer is located between the first pole piece and the second pole piece; wherein the insulating liquid wraps at least part of the outer circumferential surface of the solid-state cell.

[0008] In the technical solution, the solid-state battery cell is set as a cylindrical structure, at least part of the solid-state electrolyte layer is located between the first electrode sheet and the second electrode sheet in the radial direction of the solid-state battery cell, and the insulating liquid coats at least part of the outer circumferential surface of the solid-state battery cell. Thus, the insulating liquid can better pressurize the first electrode sheet and the solid-state electrolyte layer and the second electrode sheet and the solid-state electrolyte layer when pressure is applied to the outer circumferential surface of the solid-state battery cell. Thus, the contact area and the contact effect between the first electrode sheet and the solid-state electrolyte layer and between the second electrode sheet and the solid-state electrolyte layer can be further improved. The phenomenon that the conductivity of the solid-state battery cell is different at different positions and fluctuates can be further reduced. The internal short circuit risk caused by the deposition of ion metal in the solid-state battery cell and the breakthrough of the solid-state electrolyte layer can be further reduced. The performance of the solid-state battery cell can be further improved in the use process, and the risk of failure can be further reduced. Thus, the use reliability and the use life of the battery can be further improved. In addition, the solid-state battery cell is set as a cylindrical structure, which can relieve the difficulty of aligning the edges of the first electrode sheet, the solid-state electrolyte layer, and the second electrode sheet. Thus, the production quality of the solid-state battery cell can be improved.

[0009] In some embodiments, the insulating liquid fills the space in the assembly space that is not occupied by the solid-state battery cell.

[0010] In the technical solution, the insulating liquid is set to fill the space in the assembly space that is not occupied by the solid-state battery cell. Thus, the gap between any position of the solid-state battery cell and the box is provided with the insulating liquid. The solid-state battery cell is entirely coated with the insulating liquid. On the one hand, the pressurizing effect of the insulating liquid on the solid-state battery cell can be further improved. The contact area and the contact effect between the first electrode sheet and the solid-state electrolyte layer and between the second electrode sheet and the solid-state electrolyte layer can be further improved. On the other hand, the heat exchange effect between the insulating liquid and the solid-state battery cell can be further improved. The phenomenon that the temperature of the solid-state battery cell is too high or too low in the use process can be further relieved.

[0011] In some embodiments, the second electrode sheet encloses a containing cavity, at least part of the first electrode sheet is arranged in the containing cavity, at least part of the solid-state electrolyte layer is arranged in the containing cavity, and the solid-state electrolyte layer is located between the outer surface of the first electrode sheet and the inner surface of the second electrode sheet.

[0012] In the technical solution, the second pole piece is arranged to form an accommodating cavity, at least part of the first pole piece is arranged in the accommodating cavity, and the solid-state electrolyte layer is arranged between the outer surface of the first pole piece and the inner surface of the second pole piece, so as to form a solid-state battery structure in which the solid-state electrolyte layer is located between the first pole piece and the second pole piece. The solid-state battery with the structure can realize a structure in which the first pole piece, the solid-state electrolyte layer and the second pole piece are sequentially covered from inside to outside. On the one hand, the manufacturing difficulty of the solid-state battery can be reduced, and the production efficiency of the solid-state battery can be improved. On the other hand, the difficulty of aligning the edges of the first pole piece, the solid-state electrolyte layer and the second pole piece with each other can be reduced, and the phenomenon that the edges of the first pole piece and the second pole piece are damaged due to stress concentration can be reduced, so that the production quality of the solid-state battery can be effectively improved.

[0013] In some embodiments, along the first direction, the accommodating cavity is formed with a first opening at one end of the second pole piece; wherein at least part of the first pole piece is inserted into the accommodating cavity from the first opening along the first direction.

[0014] In the technical solution, the first opening is arranged at one end of the second pole piece along the first direction and communicates with the accommodating cavity, and the first pole piece is arranged to be inserted into the accommodating cavity from the first opening along the first direction, so as to realize that at least part of the first pole piece is arranged in the accommodating cavity. The solid-state battery with the structure can reduce the manufacturing difficulty of arranging the first pole piece in the accommodating cavity of the second pole piece, and can reduce the difficulty of arranging the solid-state electrolyte layer between the first pole piece and the second pole piece, so as to further reduce the manufacturing difficulty of the solid-state battery.

[0015] In some embodiments, the first pole piece comprises a first active material layer, the second pole piece comprises a second active material layer, and the solid-state electrolyte layer is located between the first active material layer and the second active material layer; wherein along the first direction, the first active material layer does not exceed one end of the solid-state electrolyte layer close to the first opening; and / or along the first direction, the second active material layer does not exceed one end of the solid-state electrolyte layer close to the first opening.

[0016] In the technical solution, the first active material layer of the first pole piece is arranged in the first direction and does not exceed the end of the solid electrolyte layer close to the first opening, so that the effect of the solid electrolyte layer separating the first active material layer of the first pole piece and the second active material layer of the second pole piece is improved, the short circuit phenomenon between the first pole piece and the second pole piece is reduced, and the risk of internal short circuit of the solid-state battery during use is reduced. Similarly, the second active material layer of the second pole piece is arranged in the first direction and does not exceed the end of the solid electrolyte layer close to the first opening, so that the effect of the solid electrolyte layer separating the first active material layer of the first pole piece and the second active material layer of the second pole piece is improved, the short circuit phenomenon between the first pole piece and the second pole piece is reduced, and the risk of internal short circuit of the solid-state battery during use is reduced.

[0017] In some embodiments, along the first direction, one end of the first pole piece extends out of the accommodating cavity; wherein the solid-state battery further comprises an electrode lead-out portion, the electrode lead-out portion is electrically connected with the first pole piece, and the electrode lead-out portion is located at the end of the second pole piece where the first opening is formed.

[0018] In the technical solution, one end of the first pole piece in the first direction extends out of the accommodating cavity, and the electrode lead-out portion electrically connected with the first pole piece is arranged on the side of the second pole piece where the first opening is formed, so that the electrode lead-out portion can input or output the electric energy of the first pole piece. The solid-state battery with this structure can reduce the difficulty of inputting or outputting the electric energy of the first pole piece of the solid-state battery, and can reduce the difficulty of subsequent assembly of the solid-state battery into a group to form a battery.

[0019] In some embodiments, along the first direction, the electrode lead-out portion covers the first opening.

[0020] In the technical solution, the electrode lead-out portion is arranged to cover the first opening of the second pole piece in the first direction, so that the electrode lead-out portion can not only input or output the electric energy of the first pole piece, but also can shield the first opening to some extent, thereby helping to alleviate the phenomenon that impurities or other substances enter the accommodating cavity from the first opening, and further reducing the risk of damage or internal short circuit of the solid-state battery during use.

[0021] In some embodiments, the solid-state battery further comprises an insulating member; the insulating member is arranged between the electrode lead-out portion and the second pole piece in the first direction to insulate and separate the electrode lead-out portion and the second pole piece.

[0022] In the technical solution, the solid-state battery cell further comprises an insulating member, and the insulating member is arranged between the electrode lead-out part and the second pole piece in the first direction, so that the insulating member can insulate and separate the electrode lead-out part and the second pole piece, thereby reducing the risk of short circuit between the electrode lead-out part and the second pole piece, and effectively improving the use reliability of the battery.

[0023] In some embodiments, the first pole piece comprises a first current collector and a first active material layer; the first current collector is inserted into the accommodation cavity from the first opening in the first direction, and one end of the first current collector extends out of the accommodation cavity and is connected with the electrode lead-out part; the first active material layer is arranged on the outer surface of the part of the first current collector inserted into the accommodation cavity, and the first active material layer is located between the first current collector and the solid-state electrolyte layer; wherein in the same plane perpendicular to the first direction, the area of the orthogonal projection of the first current collector is smaller than the area of the orthogonal projection of the electrode lead-out part.

[0024] In the technical solution, the area of the projection of the electrode lead-out part in the first direction is greater than the area of the projection of the first current collector in the first direction, so that the area of the electrode lead-out part for connecting with other components is greater than that of the first current collector, thereby effectively increasing the area of the first pole piece of the solid-state battery cell for connecting with other components, on the one hand, reducing the difficulty of assembling the solid-state battery cell into a group to form a battery, and improving the assembly efficiency of the battery, on the other hand, increasing the overcurrent area between the first pole piece of the solid-state battery cell and other components, and improving the use performance of the battery.

[0025] In some embodiments, the electrode lead-out part and the first current collector are integrally formed.

[0026] In the technical solution, the electrode lead-out part and the first current collector are integrally formed, thereby improving the connection reliability and stability between the electrode lead-out part and the first current collector, reducing the phenomenon of mutual separation of the electrode lead-out part and the first current collector during use, and thereby reducing the risk of connection failure of the solid-state battery cell during use.

[0027] In some embodiments, the battery comprises a plurality of solid-state battery cells, and the plurality of solid-state battery cells are arranged in the assembly space and immersed in the insulating liquid.

[0028] In the above technical solution, by setting multiple solid-state cells in the assembly space of the casing, and immersing all the solid-state cells in insulating liquid, the battery capacity can be increased while the insulating liquid can pressurize the multiple solid-state cells. This helps to reduce the difficulty of pressurizing multiple solid-state cells in a large-capacity battery, thereby improving the battery assembly efficiency.

[0029] In some embodiments, a plurality of the solid-state cells are spaced apart.

[0030] In the above technical solution, by arranging multiple solid-state cells in the assembly space at intervals, an insulating liquid is placed between each pair of adjacent solid-state cells, thereby mitigating the effect of pressurizing the multiple solid-state cells by the insulating liquid and reducing the interference between the multiple solid-state cells.

[0031] In some embodiments, the enclosure includes a body and a lid; the body has a second opening; the lid closes to the second opening and is sealed to the body, the lid and the body together defining the assembly space.

[0032] In the above technical solution, the box is provided with a box body and a box cover, and the assembly space is a structure jointly defined by the box body and the box cover. The battery with this structure is convenient for assembling solid-state cells into the assembly space of the box and for injecting insulating liquid into the assembly space of the box, which helps to reduce the assembly difficulty of the battery. On the other hand, the sealing connection between the box body and the box cover can realize an assembly space with sealing performance, which helps to reduce the molding difficulty of the assembly space and improve the production efficiency of the battery.

[0033] In some embodiments, the insulating fluid includes lubricating oil or hydraulic oil.

[0034] In the above technical solution, lubricating oil or hydraulic oil is used as the insulating fluid to pressurize the solid-state battery cell. Since lubricating oil or hydraulic oil has good electrical insulation properties and is not prone to chemical reaction with the solid-state battery cell, the risk of internal short circuit in the battery can be reduced, and the phenomenon of solid-state battery cell being contaminated or chemically reacting with the insulating fluid can be alleviated, thereby improving the stability and reliability of the battery.

[0035] In some embodiments, the insulating liquid includes silicone oil or mineral oil.

[0036] Secondly, embodiments of this application also provide an electrical device, including the battery described above, wherein the battery is used to provide electrical energy. Attached Figure Description

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0038] Figure 1 The structural schematic diagram of the vehicle provided for some embodiments of the present application;

[0039] Figure 2 The structural schematic diagram of the battery provided for some embodiments of the present application;

[0040] Figure 3 The structural exploded view of the battery provided for some embodiments of the present application;

[0041] Figure 4 The structural schematic diagram of the solid-state cell provided for some embodiments of the present application;

[0042] Figure 5 The sectional view of the solid-state cell perpendicular to the first direction provided for some embodiments of the present application;

[0043] Figure 6 The sectional view of the solid-state cell parallel to the first direction provided for some embodiments of the present application.

[0044] Icon: 1000-vehicle; 100-battery; 10-box body; 11-assembly space; 12-box body; 121-second opening; 13-box cover; 20-solid-state cell; 21-first pole piece; 211-first current collector; 212-first active material layer; 22-solid-state electrolyte layer; 23-second pole piece; 231-second current collector; 232-second active material layer; 233-receiving cavity; 234-first opening; 24-electrode lead-out part; 25-insulating piece; 30-insulating liquid; 200-controller; 300-motor; X-first direction. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used in the application have the same meanings as those commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing the particular embodiments only and is not intended to be limiting of the application; the description and the drawings are to be regarded as illustrative in nature; the word "comprising" and "comprises", and the like, when used in the specification in this application, is used to mean including but not limited to, and when construed together as "comprising at least".

[0047] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0048] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0049] The term "and / or" in the application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0050] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0051] "Multiple" appearing in the application means more than two (including two).

[0052] In the embodiments of the application, the solid-state battery can be a secondary battery, which refers to a solid-state battery that can be activated by charging after discharging.

[0053] Solid-state batteries can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these.

[0054] Solid-state battery cells typically consist of a positive electrode, a negative electrode, and an insulating component. During the charging and discharging process of a solid-state battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The insulating component, placed between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0055] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0056] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

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

[0058] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM)333 LiNi 0.5 Co 0.2 Mn 0.3 O2(also can be referred to as NCM 523 LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM 211 LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0059] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the foam metal can be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0060] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0061] As an example, the negative electrode current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. 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, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0062] As an example, the negative electrode sheet 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.

[0063] 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.

[0064] As an example, the negative active material can employ a negative active material for a solid-state battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone only one or two or more can be used in combination.

[0065] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0066] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0067] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0068] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0069] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0070] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0071] In some embodiments, the solid-state battery cell has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to have the jelly-roll structure.

[0072] In some embodiments, the solid-state battery cell has a stacked structure.

[0073] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0074] As an example, the plurality of positive electrode sheets can be provided, and the plurality of negative electrode sheets can be folded to form a plurality of folded segments stacked one on another, and one positive electrode sheet can be interposed between adjacent folded segments.

[0075] As an example, the plurality of positive electrode sheets can be folded to form a plurality of folded segments stacked one on another, and the plurality of negative electrode sheets can be folded to form a plurality of folded segments stacked one on another.

[0076] As an example, the plurality of separators can be provided, and each of the plurality of separators can be interposed between adjacent positive electrode sheets or negative electrode sheets.

[0077] As an example, the plurality of separators can be continuously provided, and each of the plurality of separators can be interposed between adjacent positive electrode sheets or negative electrode sheets by being folded or wound.

[0078] In some embodiments, the solid-state battery cell can have a cylindrical shape, a flat shape, or a polygonal shape.

[0079] As an example, the solid-state battery cell can have a cylindrical shape, a prismatic shape, a pouch shape, or another shape.

[0080] The battery referred to in the embodiments of the present application refers to a single physical module including one or more solid-state battery cells to provide higher voltage and capacity.

[0081] In some embodiments, the battery can be a battery module, and the plurality of solid-state battery cells can be arranged and fixed to form the battery module.

[0082] In some embodiments, the battery can be a battery pack, and the battery pack can include a case and the solid-state battery cell, and the solid-state battery cell or the battery module can be accommodated in the case.

[0083] In some embodiments, the case can be a part of a chassis structure of a vehicle. For example, a part of the case can be at least a part of a floor of the vehicle, or a part of the case can be at least a part of a cross beam and a longitudinal beam of the vehicle.

[0084] In some embodiments, the battery can be an energy storage device. The energy storage device can include an energy storage container or an energy storage cabinet.

[0085] The battery has outstanding advantages such as high energy density, small environmental pollution, large power density, long service life, wide adaptation range, and small self-discharge coefficient, and is an important part of the development of new energy. The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, and charge-discharge rate.

[0086] In the battery technology, in order to improve the energy density and charging speed of the battery, the battery is usually set as a solid-state battery, that is, the battery includes a box body and a solid-state battery cell contained in the box body. In the related art, the solid-state battery cell includes a positive electrode sheet, a negative electrode sheet, and a solid-state electrolyte layer arranged between the positive electrode sheet and the negative electrode sheet. However, since the positive electrode sheet, the solid-state electrolyte layer, and the negative electrode sheet of the solid-state battery cell are in contact with each other through particles to transmit electrons and ions, external pressure needs to be applied to the solid-state battery cell to improve the contact area and contact effect between the positive and negative electrode sheets and the solid-state electrolyte layer. However, in the related art, the solid-state battery cell of the battery has a very large stress accumulation inside during the charging and discharging process due to the volume shrinkage and expansion effect of the material itself, so that the external applied pressure cannot always remain constant, thereby causing the contact area between the positive and negative electrode sheets and the solid-state electrolyte layer to decrease or the contact effect to be poor during the use of the solid-state battery cell, resulting in different conductivity at different positions of the solid-state battery cell. On the one hand, it is easy to cause the phenomenon of ion metal deposition in the use of the solid-state battery cell, and even after too much ion metal deposition, the solid-state electrolyte layer is broken, so that the solid-state battery cell has the risk of internal short circuit during use. On the other hand, it is easy to cause the performance of the battery to decrease or even fail, which is not conducive to improving the use reliability and service life of the battery.

[0087] Based on the above considerations, in order to solve the problem of low use reliability and short service life of the battery, the embodiments of the present application provide a battery, which includes a box body, a solid-state battery cell, and an insulating liquid. The inside of the box body forms an assembly space. The solid-state battery cell is arranged in the assembly space, and the solid-state battery cell includes a first electrode sheet, a solid-state electrolyte layer, and a second electrode sheet. The polarities of the first electrode sheet and the second electrode sheet are opposite, and the solid-state electrolyte layer is arranged between the first electrode sheet and the second electrode sheet to separate the first electrode sheet and the second electrode sheet. The insulating liquid is contained in the assembly space, and the solid-state battery cell is immersed in the insulating liquid.

[0088] In the battery with the structure, the insulating liquid is arranged in the assembly space of the box body, and the solid-state battery cell accommodated in the assembly space is immersed in the insulating liquid, so that the insulating liquid can wrap the outside of the solid-state battery cell and externally pressurize the solid-state battery cell, so as to improve the contact area and contact effect between the first electrode sheet and the solid-state electrolyte layer and between the second electrode sheet and the solid-state electrolyte layer. On the one hand, the battery with the structure can pressurize the solid-state battery cell from multiple directions, which is beneficial to improve the contact area and contact effect at any position between the first electrode sheet and the solid-state electrolyte layer and between the second electrode sheet and the solid-state electrolyte layer. On the other hand, the external pressure on the solid-state battery cell cannot be affected by the shrinkage and expansion of the solid-state battery cell, so that the insulating liquid can still pressurize the solid-state battery cell when the solid-state battery cell shrinks or expands during use, so that the external pressure on the solid-state battery cell can remain constant, thereby effectively relieving the phenomenon that the contact area between the first electrode sheet and the solid-state electrolyte layer and the contact area between the second electrode sheet and the solid-state electrolyte layer decrease or the contact effect is poor during use, so as to relieve the phenomenon that the conductivity of the solid-state battery cell at different positions is different and fluctuates, thereby effectively reducing the risk of internal short circuit caused by the deposition of ion metal and the breakthrough of the solid-state electrolyte layer of the solid-state battery cell, and effectively reducing the risk of performance degradation or even failure of the solid-state battery cell during use, which is beneficial to improve the use reliability and service life of the battery. In addition, the solid-state battery cell is arranged to be immersed in the insulating liquid, so that the insulating liquid can also exchange heat with the solid-state battery cell, so that the insulating liquid can play a certain heat management role on the solid-state battery cell, which is beneficial to relieve the phenomenon that the temperature of the solid-state battery cell is too high or too low during use.

[0089] The battery disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. A power supply system composed of the battery disclosed in the present application can be used to form the electric device, so that the use reliability and service life of the battery can be improved by relieving the problems of internal short circuit or performance degradation of the battery during use.

[0090] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0091] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0092] 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 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to supply power for the vehicle 1000, for example, the battery 100 can be used as an operating power source or a use power source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery 100 to supply power for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0093] In some embodiments of the present application, the battery 100 can not only be used as an operating power source or a use power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0094] According to some embodiments of the present application, with reference to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 2 A structural schematic diagram of a battery 100 is provided for some embodiments of the present application, Figure 3 An exploded view of a battery 100 is provided for some embodiments of the present application, Figure 4 A structural schematic diagram of a solid-state battery cell 20 is provided for some embodiments of the present application, Figure 5 A sectional view of a solid-state battery cell 20 perpendicular to a first direction X is provided for some embodiments of the present application, Figure 6 A sectional view of a solid-state battery cell 20 parallel to a first direction X is provided for some embodiments of the present application. The present application provides a battery 100, which includes a box body 10, a solid-state battery cell 20, and an insulating liquid 30. An assembly space 11 is formed in the inside of the box body 10. The solid-state battery cell 20 is arranged in the assembly space 11, and the solid-state battery cell 20 includes a first electrode sheet 21, a solid-state electrolyte layer 22, and a second electrode sheet 23, the polarities of the first electrode sheet 21 and the second electrode sheet 23 are opposite, and the solid-state electrolyte layer 22 is arranged between the first electrode sheet 21 and the second electrode sheet 23 to separate the first electrode sheet 21 and the second electrode sheet 23. The insulating liquid 30 is contained in the assembly space 11, the solid-state battery cell 20 is immersed in the insulating liquid 30, and the insulating liquid 30 is configured to apply pressure to the solid-state battery cell 20.

[0095] The box body 10 is used to provide an assembly space 11 for the solid-state battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a box body 12 and a box cover 13, the box body 12 and the box cover 13 are connected to each other in a covering and sealing manner, and the box body 12 and the box cover 13 jointly define the assembly space 11 for accommodating the solid-state battery cell 20. The box body 12 can be a hollow structure with one end open, and the box cover 13 can be a plate-shaped structure, which covers the open side of the box body 12 to jointly define the assembly space 11 with the box body 12. Of course, in other embodiments, the box body 12 and the box cover 13 can also be hollow structures with one side open, and the open side of the box cover 13 covers the open side of the box body 12.

[0096] Of course, the box body 10 formed by the box body 12 and the box cover 13 can have various shapes, such as a cylinder, a cuboid, or a square, etc. Exemplarily, in the embodiment shown in FIG. 1, the box body 10 is a cuboid. Figure 2

[0097] In the battery 100, the solid-state battery cell 20 arranged in the box body 10 can be one or multiple. When the solid-state battery cell 20 arranged in the box body 10 is multiple, the multiple solid-state battery cells 20 can be in series, parallel, or mixed connection, and the mixed connection means that the multiple solid-state battery cells 20 are in both series and parallel connection. The multiple solid-state battery cells 20 can be directly connected in series, parallel, or mixed connection, and then the whole of the multiple solid-state battery cells 20 is accommodated in the box body 10. Of course, the battery 100 can also be that the multiple solid-state battery cells 20 are first connected in series, parallel, or mixed connection to form a battery module, and then the multiple battery modules are connected in series, parallel, or mixed connection to form a whole, and the whole is accommodated in the box body 10.

[0098] In some embodiments, the battery 100 can further include other structures, for example, the battery 100 can further include a current collecting component, which is used to connect the multiple solid-state battery cells 20 to realize the electrical connection between the multiple solid-state battery cells 20.

[0099] The solid-state battery cell 20 includes a first electrode sheet 21, a solid-state electrolyte layer 22, and a second electrode sheet 23, and the polarities of the first electrode sheet 21 and the second electrode sheet 23 are opposite, that is, the first electrode sheet 21 and the second electrode sheet 23 are respectively used to input or output the positive electrode and the negative electrode of the solid-state battery cell 20.

[0100] The solid-state electrolyte layer 22 is arranged between the first electrode sheet 21 and the second electrode sheet 23 to separate the first electrode sheet 21 and the second electrode sheet 23, that is, the solid-state electrolyte layer 22 is located between the first electrode sheet 21 and the second electrode sheet 23, which can not only play a role in transmitting ions and electrons, but also play a role in separating the first electrode sheet 21 and the second electrode sheet 23 to reduce the risk of short circuit between the first electrode sheet 21 and the second electrode sheet 23. ​

[0101] Exemplarily, the solid-state electrolyte layer 22 can be a polymer solid-state electrolyte layer 22, an inorganic solid-state electrolyte layer 22 or a composite solid-state electrolyte layer 22, etc.

[0102] The first electrode tab 21 includes a first current collector 211 and a first active material layer 212 disposed on a surface of the first current collector 211 facing the solid-state electrolyte layer 22, and correspondingly, the second electrode tab 23 includes a second current collector 231 and a second active material layer 232 disposed on a surface of the second current collector 231 facing the solid-state electrolyte layer 22, so that the solid-state electrolyte layer 22 is located between the first active material layer 212 of the first electrode tab 21 and the second active material layer 232 of the second electrode tab 23.

[0103] Exemplarily, the first electrode tab 21 is a negative electrode tab, and correspondingly, the first active material layer 212 of the first electrode tab 21 includes a negative electrode active material, and the second active material layer 232 of the second electrode tab 23 includes a positive electrode active material. Of course, in other embodiments, the first electrode tab 21 can also be a positive electrode tab, and correspondingly, the second electrode tab 23 is a negative electrode tab.

[0104] Optionally, the shape of the solid-state battery cell 20 can be various, for example, the solid-state battery cell 20 can be a cuboid, a cylinder, a prism or other shapes, etc. Exemplarily, in the embodiments shown in Figure 3 and Figure 4 The solid-state battery cell 20 is in a cylindrical structure, and correspondingly, the first electrode tab 21, the solid-state electrolyte layer 22 and the second electrode tab 23 are all in a cylindrical shape and coaxially arranged, the solid-state electrolyte layer 22 is wrapped on the outer side of the first electrode tab 21, and the second electrode tab 23 is wrapped on the outer side of the solid-state electrolyte layer 22.

[0105] The solid-state battery cell 20 is immersed in the insulating liquid 30, and the insulating liquid 30 is configured to apply pressure to the solid-state battery cell 20, that is, the insulating liquid 30 is wrapped on the outer side of the solid-state battery cell 20, so that the hydraulic pressure of the insulating liquid 30 itself can act on the outer surface of the solid-state battery cell 20 to pressurize the solid-state battery cell 20, thereby being able to increase the contact effect between the first electrode tab 21 and the solid-state electrolyte layer 22 and between the second electrode tab 23 and the solid-state electrolyte layer 22.

[0106] Exemplarily, the insulating liquid 30 can be various, for example, the insulating liquid 30 can be lubricating oil, such as silicone oil, and the insulating liquid 30 can also be hydraulic oil, such as mineral oil or fluorinated oil, etc.

[0107] In the embodiment, by arranging the insulating liquid 30 in the assembly space 11 of the box body 10, and the solid-state battery cell 20 contained in the assembly space 11 is immersed in the insulating liquid 30, so that the insulating liquid 30 can wrap the outside of the solid-state battery cell 20 and externally pressurize the solid-state battery cell 20, so as to improve the contact area and contact effect between the first electrode sheet 21 and the solid-state electrolyte layer 22 and between the second electrode sheet 23 and the solid-state electrolyte layer 22. The battery 100 adopting the structure can externally pressurize the solid-state battery cell 20 from multiple directions, which is beneficial to improve the contact area and contact effect between the first electrode sheet 21 and the solid-state electrolyte layer 22 and between the second electrode sheet 23 and the solid-state electrolyte layer 22 at any position. On the other hand, the external pressure received by the solid-state battery cell 20 will not be affected by the shrinkage and expansion of the solid-state battery cell 20, so that the insulating liquid 30 can still pressurize the solid-state battery cell 20 when the solid-state battery cell 20 shrinks and expands during use, so as to keep the external pressure received by the solid-state battery cell 20 constant, thereby effectively alleviating the phenomenon of reduction of the contact area or poor contact effect between the first electrode sheet 21 and the solid-state electrolyte layer 22 and between the second electrode sheet 23 and the solid-state electrolyte layer 22 of the solid-state battery cell 20 during use, so as to alleviate the phenomenon of different conductivity at different positions of the solid-state battery cell 20, and effectively reduce the risk of internal short circuit caused by deposition of ion metal and breakdown of the solid-state electrolyte layer 22 of the solid-state battery cell 20, and effectively reduce the risk of performance degradation or even failure of the solid-state battery cell 20 during use, which is beneficial to improve the use reliability and service life of the battery 100. In addition, by arranging the solid-state battery cell 20 to be immersed in the insulating liquid 30, the insulating liquid 30 can also exchange heat with the solid-state battery cell 20, so as to play a certain heat management role in the solid-state battery cell 20, which is beneficial to alleviate the phenomenon of excessively high or low temperature of the solid-state battery cell 20 during use.

[0108] According to some embodiments of the present application, as shown in Figure 3 , Figure 4 and Figure 5 , the solid-state battery cell 20 is in a cylindrical shape, and at least part of the solid-state electrolyte layer 22 is located between the first electrode sheet 21 and the second electrode sheet 23 along the radial direction of the solid-state battery cell 20. The insulating liquid 30 wraps at least part of the outer circumferential surface of the solid-state battery cell 20, and the insulating liquid 30 is configured to apply pressure to the outer circumferential surface of the solid-state battery cell 20.

[0109] The central axis of the solid-state battery cell 20 extends along the first direction X.

[0110] Optionally, along the radial direction of the solid-state battery cell 20, the solid-state electrolyte layer 22 can be only partially located between the first electrode sheet 21 and the second electrode sheet 23, or can be entirely located between the first electrode sheet 21 and the second electrode sheet 23. Exemplarily, as shown in Figure 6 As shown, the first pole piece 21 is in a cylindrical shape, and a central axis of the first pole piece 21 extends along the first direction X, the solid-state electrolyte layer 22 and the second pole piece 23 are both in a cylindrical shape and are in a hollow structure with one end open in the first direction X, the solid-state electrolyte layer 22 is inserted into the inside of the second pole piece 23, and the first pole piece 21 is inserted into the inside of the solid-state electrolyte layer 22, so that the solid-state electrolyte layer 22 is only partially located between the first pole piece 21 and the second pole piece 23. Of course, in other embodiments, the solid-state electrolyte layer 22 and the second pole piece 23 can also be in a cylindrical shape and be in a hollow structure with both ends open in the first direction X, so that the solid-state electrolyte layer 22 is wrapped around the outer peripheral side of the first pole piece 21 around the central axis of the first pole piece 21, and correspondingly, the second pole piece 23 is wrapped around the outer peripheral side of the solid-state electrolyte layer 22 around the central axis of the first pole piece 21, so that the solid-state electrolyte layer 22 is entirely located between the first pole piece 21 and the second pole piece 23.

[0111] It should be noted that the radial direction of the solid-state battery cell 20 is that, in the same plane perpendicular to the first direction X, the direction in which the central axis of the solid-state battery cell 20 points to the outer peripheral surface of the solid-state battery cell 20 or the outer peripheral surface of the solid-state battery cell 20 points to the central axis of the solid-state battery cell 20.

[0112] In this embodiment, by setting the solid-state battery cell 20 to be in a cylindrical shape, at least part of the solid-state electrolyte layer 22 is located between the first pole piece 21 and the second pole piece 23 in the radial direction of the solid-state battery cell 20, and the insulating liquid 30 covers at least part of the outer peripheral surface of the solid-state battery cell 20, so that the insulating liquid 30 can better pressurize the first pole piece 21 and the solid-state electrolyte layer 22 and the second pole piece 23 and the solid-state electrolyte layer 22 when the insulating liquid 30 exerts pressure on the outer peripheral surface of the solid-state battery cell 20, thereby further improving the contact area and contact effect between the first pole piece 21 and the solid-state electrolyte layer 22 and between the second pole piece 23 and the solid-state electrolyte layer 22, to further reduce the phenomenon of different conductivities at different positions of the solid-state battery cell 20 and fluctuations, and further reduce the risk of internal short circuit caused by ion metal deposition and breakdown of the solid-state electrolyte layer 22 of the solid-state battery cell 20, and further reduce the risk of performance degradation or even failure of the solid-state battery cell 20 during use, to further improve the use reliability and service life of the battery 100. In addition, by setting the solid-state battery cell 20 to be in a cylindrical shape, the difficulty of aligning the edges of the first pole piece 21, the solid-state electrolyte layer 22 and the second pole piece 23 with each other can be alleviated, which is conducive to improving the production quality of the solid-state battery cell 20.

[0113] In some embodiments, referring to Figure 3As shown, the insulating liquid 30 fills the space in the assembly space 11 that is not occupied by the solid-state battery cell 20. That is, the gap between the solid-state battery cell 20 and the inner surface of the box 10 and the gap between the solid-state battery cells 20 are both filled with the insulating liquid 30.

[0114] In this embodiment, by arranging the insulating liquid 30 to fill the space in the assembly space 11 that is not occupied by the solid-state battery cell 20, the gap between any position of the solid-state battery cell 20 and the box 10 is arranged with the insulating liquid 30, so as to achieve a structure in which the solid-state battery cell 20 as a whole is covered by the insulating liquid 30. On the one hand, this can further improve the pressurizing effect of the insulating liquid 30 on the solid-state battery cell 20, so as to further improve the contact area and contact effect between the first electrode sheet 21 and the solid-state electrolyte layer 22 and between the second electrode sheet 23 and the solid-state electrolyte layer 22. On the other hand, this can further improve the heat exchange effect between the insulating liquid 30 and the solid-state battery cell 20, so as to further alleviate the phenomenon of excessively high or low temperature of the solid-state battery cell 20 during use.

[0115] According to some embodiments of the present application, as shown in Figure 4 , Figure 5 and Figure 6 , the second electrode sheet 23 encloses to form a containing cavity 233, at least part of the first electrode sheet 21 is arranged in the containing cavity 233, at least part of the solid-state electrolyte layer 22 is arranged in the containing cavity 233, and the solid-state electrolyte layer 22 is located between the outer surface of the first electrode sheet 21 and the inner surface of the second electrode sheet 23.

[0116] In this embodiment, by arranging the second electrode sheet 23 to enclose to form the containing cavity 233, and arranging at least part of the first electrode sheet 21 in the containing cavity 233, and arranging the solid-state electrolyte layer 22 between the outer surface of the first electrode sheet 21 and the inner surface of the second electrode sheet 23, a structure of the solid-state battery cell 20 in which the solid-state electrolyte layer 22 is located between the first electrode sheet 21 and the second electrode sheet 23 is formed. The solid-state battery cell 20 adopting this structure can achieve a structure in which the first electrode sheet 21, the solid-state electrolyte layer 22 and the second electrode sheet 23 are sequentially covered from inside to outside. On the one hand, this can reduce the manufacturing difficulty of the solid-state battery cell 20, which is conducive to improving the production efficiency of the solid-state battery cell 20. On the other hand, this can alleviate the difficulty of aligning the edges of the first electrode sheet 21, the solid-state electrolyte layer 22 and the second electrode sheet 23 with each other, and can reduce the phenomenon of damage of the edges of the first electrode sheet 21 and the second electrode sheet 23 due to stress concentration, so as to effectively improve the production quality of the solid-state battery cell 20.

[0117] In this embodiment, by arranging the second electrode sheet 23 to enclose to form the containing cavity 233, and arranging at least part of the first electrode sheet 21 in the containing cavity 233, and arranging the solid-state electrolyte layer 22 between the outer surface of the first electrode sheet 21 and the inner surface of the second electrode sheet 23, a structure of the solid-state battery cell 20 in which the solid-state electrolyte layer 22 is located between the first electrode sheet 21 and the second electrode sheet 23 is formed. The solid-state battery cell 20 adopting this structure can achieve a structure in which the first electrode sheet 21, the solid-state electrolyte layer 22 and the second electrode sheet 23 are sequentially covered from inside to outside. On the one hand, this can reduce the manufacturing difficulty of the solid-state battery cell 20, which is conducive to improving the production efficiency of the solid-state battery cell 20. On the other hand, this can alleviate the difficulty of aligning the edges of the first electrode sheet 21, the solid-state electrolyte layer 22 and the second electrode sheet 23 with each other, and can reduce the phenomenon of damage of the edges of the first electrode sheet 21 and the second electrode sheet 23 due to stress concentration, so as to effectively improve the production quality of the solid-state battery cell 20.

[0118] According to some embodiments of the present application, referring to Figure 6 As shown in the figure, along the first direction X, the accommodation cavity 233 is formed with a first opening 234 at one end of the second tab 23, and at least part of the first tab 21 is inserted into the accommodation cavity 233 from the first opening 234 along the first direction X.

[0119] Wherein, the first opening 234 is arranged at one end of the second tab 23 along the first direction X, and the first opening 234 and the accommodation cavity 233 are in communication with each other, so that the first tab 21 is arranged in the structure of being inserted into the accommodation cavity 233 from the first opening 234 along the first direction X.

[0120] In this embodiment, by arranging the first opening 234 which is in communication with the accommodation cavity 233 at one end of the second tab 23 along the first direction X, and the first tab 21 is arranged in the structure of being inserted into the accommodation cavity 233 from the first opening 234 along the first direction X, at least part of the first tab 21 is accommodated in the accommodation cavity 233. The solid-state battery cell 20 using this structure can reduce the manufacturing difficulty of arranging the first tab 21 in the accommodation cavity 233 of the second tab 23, and can reduce the difficulty of arranging the solid-state electrolyte layer 22 between the first tab 21 and the second tab 23, thereby further reducing the manufacturing difficulty of the solid-state battery cell 20.

[0121] In some embodiments, referring to Figure 5 and Figure 6 As shown in the figure, the first tab 21 includes a first active material layer 212, the second tab 23 includes a second active material layer 232, and the solid-state electrolyte layer 22 is located between the first active material layer 212 and the second active material layer 232. Along the first direction X, the first active material layer 212 does not exceed one end of the solid-state electrolyte layer 22 close to the first opening 234.

[0122] Wherein, the first tab 21 includes a first current collector 211 and a first active material layer 212, the first active material layer 212 is arranged on the outer surface of the side of the first current collector 211 facing the solid-state electrolyte layer 22, the second tab 23 includes a second current collector 231 and a second active material layer 232, the second active material layer 232 is arranged on the inner surface of the side of the second active material layer 232 facing the solid-state electrolyte layer 22, so that the two sides of the solid-state electrolyte layer 22 are respectively arranged to face the first active material layer 212 and the second active material layer 232.

[0123] Optionally, along the first direction X, the first active material layer 212 does not extend beyond the end of the solid-state electrolyte layer 22 close to the first opening 234. That is, the end of the first active material layer 212 close to the first opening 234 in the first direction X is flush with the end of the solid-state electrolyte layer 22 close to the first opening 234 in the first direction X, or the end of the solid-state electrolyte layer 22 close to the first opening 234 in the first direction X extends beyond the end of the first active material layer 212 close to the first opening 234 in the first direction X.

[0124] In the embodiment, by setting the first active material layer 212 of the first tab 21 in the first direction X to not extend beyond the end of the solid-state electrolyte layer 22 close to the first opening 234, the effect of the solid-state electrolyte layer 22 separating the first active material layer 212 of the first tab 21 and the second active material layer 232 of the second tab 23 can be improved, which is conducive to reducing the short circuit phenomenon between the first tab 21 and the second tab 23, thereby reducing the risk of internal short circuit of the solid-state battery cell 20 in use.

[0125] In some embodiments, referring to Figure 6 , along the first direction X, the second active material layer 232 does not extend beyond the end of the solid-state electrolyte layer 22 close to the first opening 234.

[0126] Optionally, along the first direction X, the second active material layer 232 does not extend beyond the end of the solid-state electrolyte layer 22 close to the first opening 234. That is, the end of the second active material layer 232 close to the first opening 234 in the first direction X is flush with the end of the solid-state electrolyte layer 22 close to the first opening 234 in the first direction X, or the end of the solid-state electrolyte layer 22 close to the first opening 234 in the first direction X extends beyond the end of the second active material layer 232 close to the first opening 234 in the first direction X.

[0127] In the embodiment, by setting the second active material layer 232 of the second tab 23 in the first direction X to not extend beyond the end of the solid-state electrolyte layer 22 close to the first opening 234, the effect of the solid-state electrolyte layer 22 separating the first active material layer 212 of the first tab 21 and the second active material layer 232 of the second tab 23 can be improved, which is conducive to reducing the short circuit phenomenon between the first tab 21 and the second tab 23, thereby reducing the risk of internal short circuit of the solid-state battery cell 20 in use.

[0128] According to some embodiments of the present application, referring to Figure 4 and Figure 6 , along the first direction X, the end of the first tab 21 extends out of the accommodating cavity 233. The solid-state battery cell 20 can further include an electrode lead-out portion 24, the electrode lead-out portion 24 being electrically connected with the first tab 21, and the electrode lead-out portion 24 being located at the end of the second tab 23 where the first opening 234 is formed.

[0129] In the first direction X, one end of the first tab 21 extends out of the accommodation cavity 233, i.e., part of the first tab 21 is located in the accommodation cavity 233, and part of the first tab 21 exceeds the first opening 234. Exemplarily, in the first direction X, the first tab 21 is located at the one end of the second tab 23. Figure 6 In the first direction X, the first current collector 211 of the first tab 21 extends out of the accommodation cavity 233 from the first opening 234.

[0130] Exemplarily, the electrode lead-out portion 24 is located at the outer side of the second tab 23 and in the first direction X at the one end of the second tab 23 where the first opening 234 is formed. The electrode lead-out portion 24 is connected to the one end of the first current collector 211 of the first tab 21 extending out of the accommodation cavity 233, so that the electrode lead-out portion 24 can input or output the electrical energy of the first tab 21. Exemplarily, in the first direction X, the electrode lead-out portion 24 is located at the one end of the second tab 23. Figure 4 In the first direction X, the first current collector 211 of the first tab 21 extends out of the accommodation cavity 233 from the first opening 234.

[0131] In the present embodiment, by setting the one end of the first tab 21 in the first direction X to extend out of the accommodation cavity 233, and by further setting the electrode lead-out portion 24 connected to the first tab 21 at the side of the second tab 23 where the first opening 234 is formed, so that the electrode lead-out portion 24 can input or output the electrical energy of the first tab 21, the solid-state battery cell 20 adopting such a structure can reduce the difficulty of inputting or outputting the electrical energy of the first tab 21 of the solid-state battery cell 20, and can reduce the difficulty of subsequent assembly of the solid-state battery cell 20 into a battery 100.

[0132] In some embodiments, as shown in Figure 6 In the first direction X, the electrode lead-out portion 24 covers the first opening 234. That is, the projection of the first opening 234 in the first direction X is located in the electrode lead-out portion 24.

[0133] In the present embodiment, by setting the electrode lead-out portion 24 to cover the first opening 234 of the second tab 23 in the first direction X, the electrode lead-out portion 24 can not only realize the input or output of the electrical energy of the first tab 21, but also can play a certain shielding role for the first opening 234, thereby facilitating the alleviation of the phenomenon that impurities or other substances enter the accommodation cavity 233 from the first opening 234, and further reducing the risk of damage or internal short circuit of the solid-state battery cell 20 during use.

[0134] According to some embodiments of the present application, as shown in Figure 4 and Figure 6As shown, the solid-state battery cell 20 can further include an insulating member 25 disposed between the electrode lead-out portion 24 and the second tab 23 along the first direction X to insulate and separate the electrode lead-out portion 24 and the second tab 23.

[0135] The insulating member 25 is disposed between the second tab 23, which has the first opening 234 formed at one end thereof, and the electrode lead-out portion 24 along the first direction X, so that the insulating member 25 can insulate and separate the electrode lead-out portion 24 and the second tab 23. The insulating member 25 can be made of various materials, such as rubber, silicone, or plastic.

[0136] In the present embodiment, the solid-state battery cell 20 further includes the insulating member 25 disposed between the electrode lead-out portion 24 and the second tab 23 along the first direction X, so that the insulating member 25 can insulate and separate the electrode lead-out portion 24 and the second tab 23, thereby reducing the risk of short circuit between the electrode lead-out portion 24 and the second tab 23 and effectively improving the use reliability of the battery 100.

[0137] According to some embodiments of the present application, referring to Figure 6 As shown, the first tab 21 can include a first current collector 211 and a first active material layer 212. The first current collector 211 is inserted into the accommodation cavity 233 along the first direction X from the first opening 234, and one end of the first current collector 211 extends out of the accommodation cavity 233 and is connected to the electrode lead-out portion 24. The first active material layer 212 is disposed on the outer surface of the portion of the first current collector 211 inserted into the accommodation cavity 233, and the first active material layer 212 is located between the first current collector 211 and the solid-state electrolyte layer 22. In the same plane perpendicular to the first direction X, the area of the orthographic projection of the first current collector 211 is smaller than the area of the orthographic projection of the electrode lead-out portion 24.

[0138] The first current collector 211 and the electrode lead-out portion 24 can be an integrally formed structure or a separately disposed structure. If the first current collector 211 and the electrode lead-out portion 24 are a separately disposed structure, the connection structure between the first current collector 211 and the electrode lead-out portion 24 can be various, such as welding connection, clamping, or threaded connection.

[0139] In the same plane perpendicular to the first direction X, the area of the orthographic projection of the first current collector 211 is smaller than the area of the orthographic projection of the electrode lead-out portion 24, that is, in the first direction X, the electrode lead-out portion 24 covers the first current collector 211.

[0140] In the embodiment, by setting the area of the projection of the electrode lead-out portion 24 in the first direction X to be greater than the area of the projection of the first current collector 211 in the first direction X, the area of the first pole piece 21 of the solid-state battery cell 20 used for interconnection with other components can be effectively increased, on the one hand, the difficulty of subsequent assembly of the solid-state battery cell 20 into a group to form the battery 100 can be reduced, which is beneficial to improve the assembly efficiency of the battery 100, on the other hand, the flow area between the first pole piece 21 of the solid-state battery cell 20 and other components can be increased, which is beneficial to improve the use performance of the battery 100.

[0141] In some embodiments, referring to Figure 6 As shown in the figure, the electrode lead-out portion 24 is integrally formed with the first current collector 211. That is, the electrode lead-out portion 24 and the first current collector 211 are an integral structure, and the electrode lead-out portion 24 and the first current collector 211 can be formed by an integral molding process such as casting or milling.

[0142] In the embodiment, by setting the electrode lead-out portion 24 and the first current collector 211 of the first pole piece 21 to be integrally formed, the connection reliability and stability between the electrode lead-out portion 24 and the first current collector 211 can be improved, which is beneficial to reduce the phenomenon that the electrode lead-out portion 24 and the first current collector 211 are separated from each other during use, thereby reducing the risk of connection failure of the solid-state battery cell 20 during use.

[0143] According to some embodiments of the present application, referring to Figure 3 As shown in the figure, the battery 100 can include a plurality of solid-state battery cells 20, and the plurality of solid-state battery cells 20 are arranged in the assembly space 11 and are immersed in the insulating liquid 30.

[0144] Among them, the solid-state battery cell 20 is in a cylindrical shape, and the central axis of the solid-state battery cell 20 extends along the first direction X, and the plurality of solid-state battery cells 20 are arranged in a direction perpendicular to the first direction X.

[0145] In the embodiment, by arranging a plurality of solid-state battery cells 20 in the assembly space 11 of the box body 10, and immersing the plurality of solid-state battery cells 20 in the insulating liquid 30, the capacity of the battery 100 can be improved while the insulating liquid 30 can pressurize the plurality of solid-state battery cells 20, which is beneficial to reduce the difficulty of pressurizing the plurality of solid-state battery cells 20 in the large-capacity battery 100, thereby improving the assembly efficiency of the battery 100.

[0146] In some embodiments, referring to Figure 3 As shown in the figure, the plurality of solid-state battery cells 20 are arranged at intervals. That is, gaps are formed between the plurality of solid-state battery cells 20, and the gaps are filled with the insulating liquid 30.

[0147] In the embodiment, by arranging the plurality of solid-state battery cells 20 in the assembly space 11 at intervals, the insulation liquid 30 is arranged between each two adjacent solid-state battery cells 20, so that the effect of the insulation liquid 30 on pressurizing the plurality of solid-state battery cells 20 can be relieved, and the interference between the plurality of solid-state battery cells 20 can be reduced.

[0148] According to some embodiments of the present application, as shown in Figure 2 and Figure 3 The box body 12 has a second opening 121, and the box cover 13 covers the second opening 121 and is sealingly connected to the box body 12, and the box cover 13 and the box body 12 together define the assembly space 11.

[0149] The box body 12 and the box cover 13 are arranged along the first direction X, and the second opening 121 is formed on one side of the box body 12 in the first direction X.

[0150] The box cover 13 and the box body 12 are sealingly connected, that is, the assembly space 11 formed by the mutual connection of the box cover 13 and the box body 12 is a sealed space. Optionally, the sealing connection structure between the box cover 13 and the box body 12 can be various, such as welding connection or bonding, etc.

[0151] In the embodiment, the box body 10 is provided with the box body 12 and the box cover 13, and the assembly space 11 is a structure defined by the box body 12 and the box cover 13 of the box body 10. The battery 100 adopting such a structure can facilitate the assembly of the solid-state battery cells 20 into the assembly space 11 of the box body 10 and the injection of the insulation liquid 30 into the assembly space 11 of the box body 10, which is conducive to reducing the assembly difficulty of the battery 100. On the other hand, the sealing connection of the box body 12 and the box cover 13 can realize the assembly space 11 with sealing performance, which is conducive to reducing the forming difficulty of the assembly space 11, so as to improve the production efficiency of the battery 100.

[0152] According to some embodiments of the present application, the insulation liquid 30 includes lubricating oil or hydraulic oil.

[0153] Exemplarily, the insulation liquid 30 can be silicone oil or mineral oil, etc.

[0154] In the embodiment, the lubricating oil or hydraulic oil is used as the insulation liquid 30 to pressurize the solid-state battery cells 20. Since the lubricating oil or hydraulic oil has good electrical insulation performance and is not easy to chemically react with the solid-state battery cells 20, the risk of internal short circuit of the battery 100 can be reduced, and the phenomenon of the solid-state battery cells 20 being contaminated or chemically reacting with the insulation liquid 30 can be relieved, thereby improving the use stability and reliability of the battery 100.

[0155] According to some embodiments of the present application, the present application also provides a power-using device, the power-using device comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide power for the power-using device.

[0156] Wherein, the power-using device can be the device or system of any of the above application batteries 100.

[0157] It should be noted that the embodiments and features in the present application can be combined with each other without conflict.

[0158] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery (100) characterized in that, The application relates to a battery, comprising: a box (10) internally formed with an assembly space (11); a solid-state battery cell (20) arranged in the assembly space (11), the solid-state battery cell (20) comprising a first electrode sheet (21), a solid-state electrolyte layer (22) and a second electrode sheet (23), the first electrode sheet (21) and the second electrode sheet (23) being opposite in polarity, the solid-state electrolyte layer (22) being arranged between the first electrode sheet (21) and the second electrode sheet (23) to separate the first electrode sheet (21) and the second electrode sheet (23); and an insulating liquid (30) contained in the assembly space (11), the solid-state battery cell (20) being immersed in the insulating liquid (30). The solid-state battery cell (20) is in a cylindrical shape, and at least part of the solid-state electrolyte layer (22) is located between the first electrode sheet (21) and the second electrode sheet (23) along the radial direction of the solid-state battery cell (20).

2. The battery (100) according to claim 1, characterized in that The insulating liquid (30) covers at least part of the outer circumferential surface of the solid-state battery cell (20). The insulating liquid (30) fills the space in the assembly space (11) that is not occupied by the solid-state battery cell (20).

3. The battery (100) according to claim 2, characterized in that The second electrode sheet (23) is enclosed to form a containing cavity (233), at least part of the first electrode sheet (21) is arranged in the containing cavity (233), at least part of the solid-state electrolyte layer (22) is arranged in the containing cavity (233), and the solid-state electrolyte layer (22) is located between the outer surface of the first electrode sheet (21) and the inner surface of the second electrode sheet (23).

4. The battery (100) according to any one of claims 1-3, characterized in that, Along a first direction (X), the containing cavity (233) is formed with a first opening (234) at one end of the second electrode sheet (23).

5. The battery (100) according to claim 4, characterized in that At least part of the first electrode sheet (21) is inserted into the containing cavity (233) from the first opening (234) along the first direction (X). The first electrode sheet (21) comprises a first active material layer (212), the second electrode sheet (23) comprises a second active material layer (232), and the solid-state electrolyte layer (22) is located between the first active material layer (212) and the second active material layer (232).

6. The battery (100) according to claim 5, characterized in that Along the first direction (X), the first active material layer (212) does not extend beyond the end of the solid-state electrolyte layer (22) close to the first opening (234); and / or Along the first direction (X), the second active material layer (232) does not extend beyond the end of the solid-state electrolyte layer (22) close to the first opening (234). Along the first direction (X), one end of the first electrode sheet (21) extends out of the containing cavity (233).

7. The battery (100) according to claim 5 or 6, characterized in that The solid-state battery cell (20) further comprises an electrode lead-out portion (24) electrically connected with the first electrode sheet (21), and the electrode lead-out portion (24) is located at the end of the second electrode sheet (23) where the first opening (234) is formed. Along the first direction (X), the electrode lead-out portion (24) covers the first opening (234).

8. The battery (100) according to claim 7, characterized in that ​ 9. The battery (100) according to claim 7 or 8, characterized in that The solid-state battery cell (20) further comprises: an insulation member (25) disposed between the electrode lead-out portion (24) and the second tab (23) in the first direction (X) to insulate and separate the electrode lead-out portion (24) and the second tab (23).

10. The battery (100) according to any one of claims 7-9, characterized in that, The first tab (21) comprises: a first current collector (211) inserted into the accommodation cavity (233) from the first opening (234) in the first direction (X), and one end of the first current collector (211) extends out of the accommodation cavity (233) and is connected to the electrode lead-out portion (24); a first active material layer (212) disposed on the outer surface of the portion of the first current collector (211) inserted into the accommodation cavity (233), and the first active material layer (212) is located between the first current collector (211) and the solid-state electrolyte layer (22); wherein, in the same plane perpendicular to the first direction (X), the area of the orthographic projection of the first current collector (211) is smaller than the area of the orthographic projection of the electrode lead-out portion (24).

11. The battery (100) according to claim 10, characterized in that The electrode lead-out portion (24) is integrally formed with the first current collector (211).

12. The battery (100) according to any one of claims 1-11, characterized in that, The battery (100) comprises a plurality of solid-state battery cells (20), and each of the plurality of solid-state battery cells (20) is disposed in the assembly space (11) and immersed in the insulating liquid (30).

13. The battery (100) according to claim 12, characterized in that The plurality of solid-state battery cells (20) are arranged at intervals.

14. The battery (100) according to any one of claims 1-13, characterized in that, The box (10) comprises: a box body (12) having a second opening (121); a box cover (13) covering the second opening (121), and the box cover (13) is sealingly connected with the box body (12), and the box cover (13) and the box body (12) jointly define the assembly space (11).

15. The battery (100) according to any one of claims 1-14, characterized in that, The insulating liquid (30) comprises lubricating oil or hydraulic oil.

16. The battery (100) according to claim 15, characterized in that The insulating liquid (30) comprises silicone oil or mineral oil.

17. An electrical device, comprising: The battery (100) as claimed in any one of claims 1-16 is used to provide electrical energy. The battery (100) as claimed in any one of claims 1-16 is used to provide electrical energy.

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